/* ==========================================================================
   Abdullah Khalifa Portfolio - Style System
   Base:    #010736 (background) · #0D1C42 · #22396F
   Accents: #F2842F (orange, primary) · #FFD166 (yellow, highlight) · #597928 (green, secondary)
   ========================================================================== */

/* Design Tokens & Theme Variables (Dark / default) */
:root {
    /* Fonts */
    --font-ui: 'Plus Jakarta Sans', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-data: 'JetBrains Mono', monospace;

    /* Brand palette */
    --navy-deep: #010736;
    --navy: #0D1C42;
    --navy-blue: #22396F;
    --orange: #F2842F;
    --yellow: #FFD166;
    --green: #597928;
    --snow: #F3F5FB;                /* neutral light ink for dark mode */

    /* Theme roles */
    --bg-primary: var(--navy-deep);
    --bg-secondary: var(--navy);
    --bg-tertiary: rgba(34, 57, 111, 0.55);
    --card-bg: rgba(13, 28, 66, 0.72);
    --card-border: rgba(243, 245, 251, 0.09);
    --card-border-hover: rgba(242, 132, 47, 0.55);
    --nav-bg: rgba(1, 7, 54, 0.8);

    --text-primary: var(--snow);
    --text-secondary: rgba(243, 245, 251, 0.74);
    --text-muted: rgba(243, 245, 251, 0.54);

    --accent: var(--orange);        /* primary: buttons, links, active states */
    --accent-deep: var(--yellow);   /* gradient partner + highlights */
    --accent-2: #8DB04F;            /* green, lifted so it reads on navy */
    --accent-blue: #22396F;
    --accent-glow: rgba(242, 132, 47, 0.22);
    --on-accent: #010736;           /* text on accent-filled surfaces */

    --particle-rgb: 255, 209, 102;
    --particle-line-rgb: 141, 176, 79;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.45);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 25px rgba(242, 132, 47, 0.18);

    --scrollbar-track: #010736;
    --scrollbar-thumb: #22396F;
    --scrollbar-thumb-hover: #F2842F;

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Variables (cool off-white surfaces, navy ink, orange/green accents) */
body.light-theme {
    --bg-primary: #F4F6FB;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #EEF1F8;
    --card-bg: #FFFFFF;
    --card-border: rgba(13, 28, 66, 0.09);
    --card-border-hover: rgba(242, 132, 47, 0.6);
    --nav-bg: rgba(255, 255, 255, 0.88);

    --text-primary: #0D1C42;
    --text-secondary: #46526F;
    --text-muted: #6E7894;

    --accent: #D2691E;              /* orange deepened so it reads as text on white */
    --accent-deep: var(--orange);
    --accent-2: var(--green);
    --accent-blue: #22396F;
    --accent-glow: rgba(242, 132, 47, 0.18);
    --on-accent: #010736;

    --particle-rgb: 34, 57, 111;
    --particle-line-rgb: 89, 121, 40;

    --shadow-sm: 0 1px 3px rgba(13, 28, 66, 0.06), 0 1px 2px rgba(13, 28, 66, 0.04);
    --shadow-md: 0 8px 24px rgba(13, 28, 66, 0.08);
    --shadow-lg: 0 18px 40px rgba(13, 28, 66, 0.12);
    --shadow-glow: 0 6px 20px rgba(242, 132, 47, 0.2);

    --scrollbar-track: #F4F6FB;
    --scrollbar-thumb: #C3CADB;
    --scrollbar-thumb-hover: #F2842F;
}

/* ---- Accent placements shared by both themes ---- */
.btn-primary,
.tab-btn.active {
    background: linear-gradient(135deg, var(--orange), var(--yellow)) !important;
    color: #010736 !important;
}

.terminal-dots .dot:nth-child(1) { background-color: var(--orange) !important; opacity: 1 !important; }
.terminal-dots .dot:nth-child(2) { background-color: var(--yellow) !important; opacity: 1 !important; }
.terminal-dots .dot:nth-child(3) { background-color: var(--green) !important; }

.node-1 i { color: var(--orange) !important; }
.node-2 i { color: var(--yellow) !important; }
.node-3 i { color: var(--accent-2) !important; }

body.light-theme .node-2 i { color: #D9A21B !important; }

.logo-accent,
.code-symbol {
    color: var(--orange) !important;
}

.pill-badge i,
.cert-icon-wrapper,
.step-icon,
.badge-accent {
    color: var(--accent-2) !important;
}

/* Light theme refinements */
body.light-theme .highlight {
    background: linear-gradient(120deg, #D2691E, var(--orange));
    -webkit-background-clip: text;
    background-clip: text;
}

body.light-theme .section-divider,
body.light-theme .nav-link::after,
body.light-theme .scroll-progress-bar {
    background: linear-gradient(90deg, var(--orange), var(--yellow));
    box-shadow: none;
}

body.light-theme .marker-glowing-dot {
    background-color: var(--orange);
    border-color: #FFFFFF;
}

body.light-theme .timeline-glow-line,
body.light-theme .step-visual-line {
    background: linear-gradient(to bottom, var(--orange), var(--green));
    box-shadow: none;
}

body.light-theme .spec-subtitle {
    color: var(--green);
}

body.light-theme .stat-bubble-card .stat-plus {
    color: var(--accent);
}

body.light-theme .btn-primary,
body.light-theme .tab-btn.active {
    box-shadow: 0 6px 18px rgba(242, 132, 47, 0.3);
}

body.light-theme .hero-badge,
body.light-theme .pill-badge,
body.light-theme .badge-accent,
body.light-theme .tab-btn {
    background: #FFFFFF;
    box-shadow: var(--shadow-sm);
}

body.light-theme .project-notebook,
body.light-theme .toolkit-card,
body.light-theme .step-content-card,
body.light-theme .spec-card,
body.light-theme .telemetry-bio-card,
body.light-theme .timeline-bubble-content,
body.light-theme .credentials-card-container,
body.light-theme .stat-bubble-card,
body.light-theme .minimal-contact-card {
    box-shadow: var(--shadow-sm);
}

body.light-theme .notebook-header {
    background: #0D1C42;
}

body.light-theme .notebook-tag {
    color: var(--yellow);
}

body.light-theme .nb-tab-btn {
    color: rgba(243, 245, 251, 0.65);
}

body.light-theme .nb-tab-btn:hover,
body.light-theme .nb-tab-btn.active {
    color: #FFFFFF;
}

body.light-theme .nb-tab-btn.active {
    background: rgba(242, 132, 47, 0.25);
    border-color: rgba(242, 132, 47, 0.5);
}

body.light-theme .token {
    background: #F4F6FB;
}

body.light-theme .timeline-badge-date,
body.light-theme .status-token.problem {
    background: rgba(242, 132, 47, 0.1);
    border-color: rgba(242, 132, 47, 0.4);
    color: #B5551A;
}

body.light-theme .step-number-bubble {
    background: #FFFFFF;
}

body.light-theme .portrait-glow {
    background: radial-gradient(circle, rgba(242, 132, 47, 0.28) 0%, rgba(255, 209, 102, 0.22) 50%, transparent 70%);
}

body.light-theme .footer {
    background: #0D1C42;
    border-top-color: transparent;
}

body.light-theme .footer-logo {
    color: #FFFFFF;
}

body.light-theme .footer-branding p,
body.light-theme .footer-nav-links a {
    color: rgba(243, 245, 251, 0.75);
}

body.light-theme .footer-nav-links a:hover {
    color: var(--yellow);
}

body.light-theme .footer-text p {
    color: rgba(243, 245, 251, 0.55);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    outline-color: var(--accent);
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

body.modal-open {
    overflow: hidden;
}

img {
    max-width: 100%;
    display: block;
}

button {
    font: inherit;
}

::selection {
    background: var(--accent);
    color: var(--on-accent);
}

/* Custom Scrollbar for Webkit */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

/* Coordinate Canvas Grid & Glow Orbs */
.canvas-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: -2;
}

#canvas-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
}

.glow-orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(130px);
    pointer-events: none;
    z-index: -1;
    opacity: 0.35;
    transition: background var(--transition-normal), transform var(--transition-slow);
}

.orb-1 {
    top: -10%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--navy-blue) 0%, transparent 70%);
    animation: driftOrbOne 30s infinite alternate ease-in-out;
}

.orb-2 {
    bottom: -15%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--navy-blue) 0%, transparent 70%);
    animation: driftOrbTwo 25s infinite alternate ease-in-out;
}

.orb-3 {
    top: 40%;
    left: 45%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--orange) 0%, transparent 70%);
    opacity: 0.05;
    animation: driftOrbThree 20s infinite alternate ease-in-out;
}

body.light-theme .glow-orb {
    opacity: 0.12;
}

body.light-theme .orb-3 {
    background: radial-gradient(circle, var(--navy-blue) 0%, transparent 70%);
}

@keyframes driftOrbOne {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-70px, 40px) scale(1.05); }
    100% { transform: translate(-30px, -30px) scale(0.95); }
}

@keyframes driftOrbTwo {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(50px, -50px) scale(0.95); }
    100% { transform: translate(-40px, 20px) scale(1.1); }
}

@keyframes driftOrbThree {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(-100px, 80px) scale(1.2); }
}

/* Layout Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 8rem 0;
    position: relative;
}

/* Section Header Styling */
.section-header {
    text-align: center;
    margin-bottom: 5rem;
    position: relative;
    z-index: 2;
}

.section-title {
    font-family: var(--font-ui);
    font-size: 2.8rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.section-divider {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    margin: 0 auto 1.5rem auto;
    border-radius: 10px;
    box-shadow: 0 0 10px var(--accent-glow);
}

.section-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto;
    font-weight: 400;
}

/* Typography Accent Styles */
.highlight {
    background: linear-gradient(120deg, var(--accent), var(--accent-deep));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

/* Premium Buttons */
.btn {
    font-family: var(--font-ui);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    padding: 0.85rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    font-size: 0.95rem;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: 2px solid transparent;
    white-space: nowrap;
}

.btn-sm {
    padding: 0.55rem 1.2rem;
    font-size: 0.85rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-deep));
    color: var(--on-accent);
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--accent-glow), 0 0 15px var(--accent-glow);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--card-border);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
    box-shadow: var(--shadow-glow);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--text-muted);
}

.btn-outline:hover {
    background: var(--bg-tertiary);
    color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-2px);
}

/* Navigation System */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--card-border);
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 75px;
}

.nav-logo a {
    font-family: var(--font-ui);
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.15rem;
    letter-spacing: -0.03em;
    white-space: nowrap;
}

.logo-accent {
    color: var(--accent-2);
    font-family: var(--font-data);
    font-weight: 700;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.8rem;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.92rem;
    font-family: var(--font-ui);
    transition: color var(--transition-fast);
    position: relative;
    padding: 0.5rem 0;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    transition: width var(--transition-normal);
    border-radius: 4px;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Theme Toggle Button */
.theme-toggle-btn {
    background: none;
    color: var(--text-secondary);
    font-size: 1.1rem;
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    border: 1px solid var(--card-border);
}

.theme-toggle-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--bg-tertiary);
    box-shadow: var(--shadow-glow);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 26px;
    height: 18px;
    cursor: pointer;
    background: none;
    border: none;
}

.bar {
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 4px;
    transition: all var(--transition-normal);
}

/* Scroll Progress Bar */
.scroll-progress-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-2), var(--accent));
    box-shadow: 0 0 8px var(--accent-glow);
    transition: width 0.1s ease;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 4rem;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--card-border);
    padding: 0.5rem 1.1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.8rem;
    letter-spacing: 0.02em;
    font-family: var(--font-ui);
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background-color: var(--accent);
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 0 0 var(--accent-glow);
    animation: dotPulse 2s infinite;
}

@keyframes dotPulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(var(--particle-rgb), 0.6); }
    70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(var(--particle-rgb), 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(var(--particle-rgb), 0); }
}

.hero-title {
    font-family: var(--font-ui);
    font-size: 4.2rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 1.2rem;
}

.typewriter-container {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
    font-family: var(--font-data);
    min-height: 2.6rem;
}

.code-symbol {
    color: var(--accent-2);
    font-weight: 700;
    font-size: 1.8rem;
    margin-right: 0.5rem;
}

.hero-subtitle {
    font-size: 1.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-right: 2px solid var(--accent);
    padding-right: 4px;
    animation: caretBlink 1s step-end infinite;
}

@keyframes caretBlink {
    50% { border-color: transparent; }
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 2.5rem;
    max-width: 620px;
}

.hero-buttons {
    display: flex;
    gap: 1.2rem;
    flex-wrap: wrap;
}

/* Fluid-morphic Portrait Card & Telemetry Nodes */
.hero-image-wrapper {
    display: flex;
    justify-content: center;
}

.hero-portrait-card {
    position: relative;
    width: 320px;
    height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.portrait-glow {
    position: absolute;
    width: 110%;
    height: 110%;
    background: radial-gradient(circle, rgba(242, 132, 47, 0.25) 0%, rgba(34, 57, 111, 0.45) 50%, transparent 70%);
    filter: blur(20px);
    z-index: 1;
    animation: pulseGlow 4s ease-in-out infinite alternate;
}

.portrait-frame {
    position: relative;
    width: 100%;
    height: 100%;
    border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
    border: 3px solid var(--card-border-hover);
    background: var(--bg-secondary);
    overflow: hidden;
    z-index: 2;
    box-shadow: var(--shadow-lg);
    animation: morphShape 12s ease-in-out infinite alternate;
    transition: border-color var(--transition-fast);
}

.hero-portrait-card:hover .portrait-frame {
    border-color: var(--accent);
}

.portrait-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 20%;
    transition: transform var(--transition-slow);
}

.hero-portrait-card:hover .portrait-img {
    transform: scale(1.05);
}

@keyframes morphShape {
    0% { border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%; }
    50% { border-radius: 50% 60% 40% 50% / 40% 60% 50% 60%; }
    100% { border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; }
}

@keyframes pulseGlow {
    0% { transform: scale(0.95); opacity: 0.8; }
    100% { transform: scale(1.05); opacity: 1; }
}

.telemetry-node {
    position: absolute;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    padding: 0.6rem 1rem;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    box-shadow: var(--shadow-md);
    z-index: 5;
    font-size: 0.82rem;
    font-weight: 600;
    transition: all var(--transition-fast);
    font-family: var(--font-ui);
    color: var(--text-primary);
    white-space: nowrap;
}

.telemetry-node:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-glow);
}

.telemetry-node i {
    font-size: 1.1rem;
    color: var(--accent);
}

.node-1 {
    top: 5%;
    left: -15%;
    animation: floatWidgetY 5s infinite ease-in-out;
}

.node-2 {
    bottom: 12%;
    right: -15%;
    animation: floatWidgetY 6s infinite ease-in-out;
    animation-delay: 1s;
}

.node-3 {
    bottom: -8%;
    left: 10%;
    animation: floatWidgetX 7s infinite ease-in-out;
    animation-delay: 0.5s;
}

@keyframes floatWidgetY {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes floatWidgetX {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(10px); }
}

/* ==========================================================================
   About Section
   ========================================================================== */
.telemetry-section {
    background: var(--bg-secondary);
}

.telemetry-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 3.5rem;
    align-items: stretch;
}

.telemetry-bio-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 2.2rem;
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: border-color var(--transition-fast), transform var(--transition-normal);
}

.telemetry-bio-card:hover {
    border-color: var(--card-border-hover);
}

.bio-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 1rem;
    margin-bottom: 1.8rem;
}

.bio-card-body {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.terminal-dots {
    display: flex;
    gap: 0.5rem;
}

.terminal-dots .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
    background-color: var(--accent);
}

.terminal-dots .dot:nth-child(2) { opacity: 0.6; }
.terminal-dots .dot:nth-child(3) { background-color: var(--accent-2); }

.terminal-title {
    font-family: var(--font-data);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.bio-greeting {
    font-family: var(--font-ui);
    font-size: 1.85rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.2rem;
}

.bio-paragraph {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 1.5rem;
}

.skills-mini-showcase {
    margin-top: auto;
    border-top: 1px solid var(--card-border);
    padding-top: 1.6rem;
}

.showcase-title {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: block;
    margin-bottom: 1rem;
}

.skills-pills-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
}

.pill-badge {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    font-weight: 600;
    background: var(--bg-tertiary);
    border: 1px solid var(--card-border);
    color: var(--text-primary);
    padding: 0.4rem 0.9rem;
    border-radius: 50px;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-fast);
}

.pill-badge:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.pill-badge i {
    font-size: 0.95rem;
    color: var(--accent);
}

.telemetry-specs-col {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    justify-content: space-between;
}

.spec-card {
    position: relative;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 1.8rem;
    display: flex;
    gap: 1.5rem;
    align-items: center;
    overflow: hidden;
    transition: transform var(--transition-normal), border-color var(--transition-fast);
    flex: 1;
}

.spec-card:hover {
    transform: translateY(-4px);
    border-color: var(--card-border-hover);
    box-shadow: var(--shadow-md);
}

.spec-icon-box {
    font-size: 1.6rem;
    color: var(--accent);
    background: var(--bg-tertiary);
    border: 1px solid var(--card-border);
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.spec-card:hover .spec-icon-box {
    background: linear-gradient(135deg, var(--accent), var(--accent-deep));
    color: var(--on-accent);
    border-color: transparent;
    box-shadow: var(--shadow-glow);
}

.spec-details {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.spec-title {
    font-family: var(--font-ui);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.2rem;
}

.spec-subtitle {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--accent-deep);
    margin-bottom: 0.15rem;
}

.spec-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.spec-glow {
    position: absolute;
    width: 80px;
    height: 80px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    top: -40px;
    right: -40px;
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
}

.spec-card:hover .spec-glow {
    opacity: 1;
}

/* ==========================================================================
   Analytics Workflow Timeline
   ========================================================================== */
.frameworks-section {
    background: var(--bg-primary);
}

.frameworks-timeline {
    max-width: 800px;
    margin: 0 auto 5rem auto;
    position: relative;
}

.framework-step-card {
    position: relative;
    padding-left: 5rem;
    margin-bottom: 3.5rem;
}

.framework-step-card:last-child {
    margin-bottom: 0;
}

.step-number-bubble {
    position: absolute;
    left: 0;
    top: 0;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 2px solid var(--accent-2);
    font-family: var(--font-data);
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 0 12px var(--accent-glow);
    z-index: 5;
}

.step-visual-line {
    position: absolute;
    left: 24px;
    top: 50px;
    bottom: -50px;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-2), var(--accent));
}

.framework-step-card:last-child .step-visual-line {
    display: none;
}

.step-content-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 16px;
    padding: 2.2rem;
    transition: transform var(--transition-normal), border-color var(--transition-fast);
}

.step-content-card:hover {
    transform: translateY(-4px);
    border-color: var(--card-border-hover);
    box-shadow: var(--shadow-md);
}

.step-card-header {
    display: flex;
    align-items: center;
    gap: 1.2rem;
    margin-bottom: 1.2rem;
}

.step-icon {
    font-size: 1.5rem;
    color: var(--accent);
    background: var(--bg-primary);
    border: 1px solid var(--card-border);
    width: 46px;
    height: 46px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
}

.step-card-header h3 {
    font-family: var(--font-ui);
    font-size: 1.35rem;
    font-weight: 700;
}

.step-subtitle-tag {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.step-desc-text {
    font-size: 0.98rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.step-token-row {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.token {
    font-family: var(--font-data);
    font-size: 0.72rem;
    font-weight: 600;
    background: var(--bg-primary);
    border: 1px solid var(--card-border);
    color: var(--text-secondary);
    padding: 0.35rem 0.85rem;
    border-radius: 6px;
}

/* Workflow stats row */
.framework-stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.stat-bubble-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: transform var(--transition-normal), border-color var(--transition-fast);
}

.stat-bubble-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.stat-bubble-card .stat-number {
    font-family: var(--font-data);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-bubble-card .stat-plus {
    font-family: var(--font-data);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-2);
}

.stat-bubble-card .stat-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-top: 0.4rem;
}

/* ==========================================================================
   Toolkit Section
   ========================================================================== */
.skills-grid-showcase {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.toolkit-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 16px;
    padding: 2.2rem;
    transition: transform var(--transition-normal), border-color var(--transition-fast);
}

.toolkit-card:hover {
    transform: translateY(-5px);
    border-color: var(--card-border-hover);
    box-shadow: var(--shadow-lg);
}

.toolkit-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.8rem;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 1rem;
}

.toolkit-card-header i {
    font-size: 1.5rem;
    color: var(--accent);
}

.toolkit-card-header h3 {
    font-family: var(--font-ui);
    font-size: 1.2rem;
    font-weight: 700;
}

.toolkit-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.toolkit-list li {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    padding-left: 1rem;
    border-left: 2px solid var(--accent-2);
    transition: border-color var(--transition-fast);
}

.toolkit-list li:hover {
    border-left-color: var(--accent);
}

.toolkit-item-name {
    font-family: var(--font-ui);
    font-size: 0.98rem;
    font-weight: 700;
    color: var(--text-primary);
}

.toolkit-item-detail {
    font-size: 0.86rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   Project Notebooks
   ========================================================================== */
.projects-section {
    background: var(--bg-secondary);
}

.projects-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3.5rem;
    flex-wrap: wrap;
}

.tab-btn {
    font-family: var(--font-ui);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--card-border);
    padding: 0.65rem 1.6rem;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.9rem;
}

.tab-btn:hover {
    color: var(--text-primary);
    border-color: var(--accent);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--accent), var(--accent-deep));
    color: var(--on-accent);
    border-color: transparent;
    box-shadow: 0 4px 12px var(--accent-glow);
}

.notebooks-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
}

.project-card-wrapper {
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

/* Center a lone card on the last row (e.g. 3 projects in a 2-column grid) */
.project-card-wrapper:last-child:nth-child(odd) {
    grid-column: 1 / -1;
    justify-self: center;
    width: calc(50% - 1.25rem);
}

.project-notebook {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 16px;
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
    transition: border-color var(--transition-fast), transform var(--transition-normal);
}

.project-notebook:hover {
    border-color: var(--card-border-hover);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.notebook-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--card-border);
    padding: 0.8rem 1.4rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.notebook-tag {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--accent);
    letter-spacing: 0.05em;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.notebook-tabs {
    display: flex;
    gap: 0.3rem;
}

.nb-tab-btn {
    font-family: var(--font-ui);
    background: transparent;
    color: var(--text-muted);
    border: 1px solid transparent;
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.78rem;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.nb-tab-btn:hover {
    color: var(--text-primary);
}

.nb-tab-btn.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--card-border);
}

.notebook-body {
    padding: 2rem 2.2rem 0.5rem;
    flex-grow: 1;
}

.nb-content {
    display: none;
    animation: termFadeIn 0.3s ease;
}

.nb-content.active {
    display: block;
}

@keyframes termFadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.notebook-title {
    font-family: var(--font-ui);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.notebook-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 1.5rem;
}

.notebook-text strong {
    color: var(--text-primary);
}

.nb-content .step-token-row {
    margin-bottom: 1.5rem;
}

.notebook-status-footer {
    display: flex;
    justify-content: flex-start;
    margin-bottom: 1.5rem;
}

.status-token {
    font-family: var(--font-data);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 0.35rem 0.8rem;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.status-token.problem {
    background: var(--accent-glow);
    border: 1px solid var(--card-border-hover);
    color: var(--accent);
}

/* Notebook insight preview */
.signal-preview-box {
    position: relative;
    display: block;
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 1.2rem;
    background: var(--bg-primary);
    border: 1px solid var(--card-border);
    cursor: zoom-in;
    padding: 0;
}

.signal-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top left;
    transition: transform var(--transition-slow);
}

.signal-preview-box:hover .signal-img,
.signal-preview-box:focus-visible .signal-img {
    transform: scale(1.04);
}

.signal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(1, 7, 54, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.signal-preview-box:hover .signal-overlay,
.signal-preview-box:focus-visible .signal-overlay {
    opacity: 1;
}

.repo-link-btn {
    font-family: var(--font-ui);
    background: var(--orange);
    color: var(--navy-deep);
    font-size: 0.85rem;
    font-weight: 700;
    padding: 0.6rem 1.2rem;
    border-radius: 50px;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.notebook-actions {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    padding: 0 2.2rem 2rem;
}

/* ==========================================================================
   Timelines (Experience + Credentials)
   ========================================================================== */
.experience-section {
    background: var(--bg-primary);
}

.education-section {
    background: var(--bg-secondary);
}

.education-timeline-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.timeline-container {
    position: relative;
    padding-left: 2rem;
}

.experience-timeline {
    max-width: 860px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2.2rem;
}

.timeline-glow-line {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 4px;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent), var(--accent-2));
    box-shadow: 0 0 10px var(--accent-glow);
}

.timeline-node-card {
    position: relative;
}

.timeline-marker {
    position: absolute;
    left: -2rem;
    top: 2rem;
    margin-left: -3px;
    z-index: 10;
}

.marker-glowing-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--accent);
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 12px var(--accent-glow);
    animation: markerPulse 3s infinite;
}

@keyframes markerPulse {
    0%, 100% { box-shadow: 0 0 6px rgba(var(--particle-rgb), 0.4); }
    50% { box-shadow: 0 0 16px rgba(var(--particle-rgb), 0.8); }
}

.timeline-bubble-content {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 16px;
    padding: 2.2rem;
    transition: border-color var(--transition-fast), transform var(--transition-normal);
}

.timeline-bubble-content:hover {
    border-color: var(--card-border-hover);
    transform: translateY(-4px);
}

.timeline-badge-date {
    font-family: var(--font-data);
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--accent);
    background: var(--accent-glow);
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    border: 1px solid var(--card-border-hover);
    display: inline-block;
    margin-bottom: 1.2rem;
}

.school-logo-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.2rem;
}

.school-logo-row .timeline-badge-date {
    margin-bottom: 0;
}

.school-logo {
    width: 64px;
    height: 64px;
    object-fit: contain;
    background: #ffffff;
    border-radius: 12px;
    padding: 6px;
}

.company-logo {
    width: 64px;
    height: 64px;
    object-fit: cover;
    border-radius: 14px;
    border: 1px solid var(--card-border);
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
}

.company-logo-wide {
    width: 192px;
}

.degree-title {
    font-family: var(--font-ui);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.4rem;
}

.school-name {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 1.2rem;
}

.timeline-desc-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.8rem;
}

.timeline-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    margin-bottom: 1.4rem;
}

.timeline-list:last-child {
    margin-bottom: 0;
}

.timeline-list li {
    position: relative;
    padding-left: 1.3rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.timeline-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.62em;
    width: 7px;
    height: 7px;
    border-radius: 2px;
    background: var(--accent-2);
}

.badge-highlights-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.badge-accent {
    font-size: 0.78rem;
    font-weight: 600;
    background: var(--bg-tertiary);
    color: var(--accent);
    border: 1px solid var(--card-border);
    padding: 0.35rem 0.9rem;
    border-radius: 20px;
}

/* Credentials card */
.credentials-card-container {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 16px;
    padding: 2.5rem;
}

.credentials-box-title {
    font-family: var(--font-ui);
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.credentials-box-title i {
    color: var(--accent);
}

.certs-list-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.cert-glass-item {
    display: flex;
    gap: 1.2rem;
    transition: transform var(--transition-normal);
}

.cert-glass-item:hover {
    transform: translateX(5px);
}

.cert-icon-wrapper {
    font-size: 1.3rem;
    color: var(--accent);
    background: var(--bg-tertiary);
    border: 1px solid var(--card-border);
    width: 46px;
    height: 46px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.cert-content-info h4 {
    font-family: var(--font-ui);
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.2rem;
    color: var(--text-primary);
}

.cert-content-info p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.cert-links {
    display: flex;
    gap: 1rem;
    margin-top: 0.4rem;
}

.cert-links a {
    font-family: var(--font-data);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px dashed var(--card-border-hover);
    transition: border-color var(--transition-fast);
}

.cert-links a:hover {
    border-bottom-color: var(--accent);
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-section {
    background: var(--bg-primary);
}

.minimal-contact-card {
    max-width: 600px;
    margin: 0 auto;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: border-color var(--transition-fast);
}

.minimal-contact-card:hover {
    border-color: var(--card-border-hover);
}

.minimal-contact-card h3 {
    font-family: var(--font-ui);
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
    color: var(--text-primary);
}

.minimal-contact-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.98rem;
    margin-bottom: 2rem;
}

.contact-links-list {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    align-items: center;
    margin-bottom: 2.2rem;
}

.minimal-contact-item {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.05rem;
    overflow-wrap: anywhere;
    transition: color var(--transition-fast), transform var(--transition-fast);
}

a.minimal-contact-item:hover {
    color: var(--accent);
    transform: translateY(-1px);
}

.minimal-contact-item i {
    color: var(--accent-2);
    font-size: 1.15rem;
    width: 20px;
    text-align: center;
}

.minimal-contact-socials {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.minimal-contact-socials a {
    color: var(--text-secondary);
    font-size: 1.3rem;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    border: 1px solid var(--card-border);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.minimal-contact-socials a:hover {
    color: var(--on-accent);
    background: var(--accent);
    border-color: var(--accent);
    transform: translateY(-2px);
}

/* ==========================================================================
   Footer & Scroll Top
   ========================================================================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--card-border);
    padding: 4rem 0;
}

.footer-layout {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-branding {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.footer-logo {
    font-family: var(--font-ui);
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--text-primary);
}

.footer-branding p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.footer-nav-links {
    display: flex;
    gap: 2rem;
}

.footer-nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.footer-nav-links a:hover {
    color: var(--accent);
}

.footer-text p {
    font-size: 0.88rem;
    color: var(--text-muted);
}

.back-to-top {
    position: fixed;
    bottom: 35px;
    right: 35px;
    width: 48px;
    height: 48px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--card-border-hover);
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.1rem;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--accent);
    color: var(--on-accent);
    border-color: transparent;
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

/* ==========================================================================
   Modals (Live Power BI embed + Screenshot lightbox)
   ========================================================================== */
.modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.modal[hidden] {
    display: none;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(1, 7, 54, 0.85);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.modal-panel {
    position: relative;
    width: 100%;
    max-height: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--card-border-hover);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: termFadeIn 0.25s ease;
}

.modal-panel-wide {
    max-width: 1200px;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.9rem 1.2rem;
    border-bottom: 1px solid var(--card-border);
}

.modal-header h3 {
    font-family: var(--font-ui);
    font-size: 1.05rem;
    font-weight: 700;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.modal-header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.modal-icon-btn {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 1px solid var(--card-border);
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.modal-icon-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.embed-frame-wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9.6;
    max-height: calc(100vh - 8rem);
    background: #ffffff;
}

.embed-frame-wrap iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.gallery-counter {
    font-family: var(--font-data);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.gallery-stage {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    min-height: 200px;
}

.gallery-stage img {
    max-width: 100%;
    max-height: calc(100vh - 8rem);
    object-fit: contain;
}

.gallery-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--card-border-hover);
    background: rgba(1, 7, 54, 0.75);
    color: #F3F5FB;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.gallery-nav:hover {
    background: var(--orange);
    color: #010736;
}

.gallery-nav.prev { left: 1rem; }
.gallery-nav.next { right: 1rem; }

.gallery-nav[hidden] {
    display: none;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 1100px) {
    .nav-menu {
        gap: 1.3rem;
    }

    .nav-link {
        font-size: 0.86rem;
    }
}

@media (max-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 4rem;
    }

    .hero-text {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }

    .typewriter-container {
        justify-content: center;
    }

    .hero-buttons {
        justify-content: center;
    }

    .telemetry-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .skills-grid-showcase {
        grid-template-columns: 1fr 1fr;
        gap: 1.8rem;
    }

    .notebooks-grid {
        grid-template-columns: 1fr;
    }

    .project-card-wrapper:last-child:nth-child(odd) {
        width: 100%;
    }

    .education-timeline-layout {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    /* Mobile Navbar menu overlay */
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 75px;
        flex-direction: column;
        background-color: var(--bg-secondary);
        border-bottom: 1px solid var(--card-border);
        width: 100%;
        text-align: center;
        transition: left var(--transition-normal);
        padding: 2.5rem 0;
        gap: 1.6rem;
        box-shadow: var(--shadow-md);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-link {
        font-size: 1rem;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
}

@media (max-width: 768px) {
    section {
        padding: 5rem 0;
    }

    .section-header {
        margin-bottom: 3.5rem;
    }

    .telemetry-bio-card {
        padding: 1.5rem;
    }

    .spec-card {
        padding: 1.2rem;
        gap: 1rem;
    }

    .section-title {
        font-size: 2.2rem;
    }

    .hero-title {
        font-size: 3rem;
    }

    .hero-subtitle {
        font-size: 1.4rem;
    }

    .code-symbol {
        font-size: 1.4rem;
    }

    .hero-portrait-card {
        width: 260px;
        height: 260px;
    }

    .node-1 { left: -8%; }
    .node-2 { right: -8%; }

    .framework-step-card {
        padding-left: 0;
        text-align: center;
    }

    .step-number-bubble {
        position: static;
        margin: 0 auto 1.5rem auto;
    }

    .step-visual-line {
        display: none;
    }

    .step-card-header {
        flex-direction: column;
        text-align: center;
    }

    .step-token-row {
        justify-content: center;
    }

    .nb-content .step-token-row {
        justify-content: flex-start;
    }

    .skills-grid-showcase {
        grid-template-columns: 1fr;
    }

    .framework-stats-row {
        grid-template-columns: 1fr;
        gap: 1.2rem;
    }

    .notebook-body {
        padding: 1.5rem 1.4rem 0.5rem;
    }

    .notebook-actions {
        padding: 0 1.4rem 1.5rem;
    }

    .timeline-bubble-content,
    .credentials-card-container {
        padding: 1.5rem;
    }

    .footer-layout {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 1.5rem;
    }

    .footer-nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1.5rem;
    }

    .modal {
        padding: 0.75rem;
    }

    .embed-frame-wrap {
        aspect-ratio: auto;
        height: calc(100vh - 6rem);
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 480px) {
    .container,
    .nav-container {
        padding: 0 1rem;
    }

    .nav-logo a {
        font-size: 1.1rem;
    }

    .hero-title {
        font-size: 2.3rem;
    }

    .hero-subtitle {
        font-size: 1.15rem;
    }

    .hero-badge {
        font-size: 0.8rem;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    .hero-portrait-card {
        width: 220px;
        height: 220px;
    }

    .telemetry-node {
        font-size: 0.72rem;
        padding: 0.45rem 0.7rem;
    }

    .notebook-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .notebook-actions .btn {
        flex: 1;
    }

    .minimal-contact-item {
        font-size: 0.92rem;
    }
}

/* Intersection Observer Animations classes */
.fade-in {
    opacity: 0;
    transform: translateY(25px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Respect users who prefer less motion */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .fade-in {
        opacity: 1;
        transform: none;
    }
}