/* ===================================
   Design System - 深藍科技風
   =================================== */

:root {
    /* Colors */
    --color-bg-primary: #0a192f;
    --color-bg-secondary: #112240;
    --color-bg-tertiary: #1d3461;
    --color-accent: #64ffda;
    --color-accent-glow: rgba(100, 255, 218, 0.15);
    --color-text-primary: #ccd6f6;
    --color-text-secondary: #8892b0;
    --color-text-heading: #e6f1ff;
    --color-white: #ffffff;

    /* Typography - Distinctive tech-inspired fonts */
    --font-primary: 'Space Mono', 'Courier New', monospace;
    --font-display: 'Orbitron', 'Rajdhani', sans-serif;
    --font-mono: 'Space Mono', 'Consolas', monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Shadows */
    --shadow-card: 0 10px 30px -15px rgba(2, 12, 27, 0.7);
    --shadow-glow: 0 0 20px rgba(100, 255, 218, 0.3);
}

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    color: var(--color-text-heading);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: 0.05em;
}

h1 {
    font-size: clamp(2.5rem, 8vw, 4rem);
}

h2 {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
}

p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-text-heading);
}

/* Container */
.container,
.section-container {
    max-width: 900px;
    /* 縮小寬度，讓內容更集中 */
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    width: 100%;
}

/* Section */
section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    /* display: flex;  Removed to allow natural flow within container */
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    position: relative;
    /* For pseudo-elements */
    display: flex;
    /* Keep flex for alignment with lines */
}

.section-title::before {
    content: '';
    display: inline-block;
    width: 30px;
    height: 2px;
    background: var(--color-accent);
}

.section-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-bg-tertiary);
    margin-left: var(--spacing-sm);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--spacing-sm) 0;
    background: rgba(10, 25, 47, 0.85);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

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

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
}

.nav-links a {
    color: var(--color-text-primary);
    font-size: 0.9rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

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

/* Mobile Menu Button */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-accent);
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 80%, rgba(100, 255, 218, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(100, 255, 218, 0.08) 0%, transparent 50%),
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(100, 255, 218, 0.03) 2px, rgba(100, 255, 218, 0.03) 4px),
        repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(100, 255, 218, 0.03) 2px, rgba(100, 255, 218, 0.03) 4px);
    pointer-events: none;
    animation: gridPulse 8s ease-in-out infinite;
}

@keyframes gridPulse {

    0%,
    100% {
        opacity: 0.5;
    }

    50% {
        opacity: 1;
    }
}

.hero-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    z-index: 1;
}

/* Photo Carousel Styles */
.hero-photo-wrapper,
.about-photo-wrapper {
    position: relative;
    flex-shrink: 0;
}

.hero-photo-wrapper .photo-carousel {
    width: 320px;
    /* Increased size */
    height: 320px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--color-accent);
    /* Thicker border */
    box-shadow: 0 0 25px rgba(100, 255, 218, 0.4);
    /* Enhanced glow */
}

.about-photo-wrapper .photo-carousel {
    width: 280px;
    height: 280px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 2px solid var(--color-accent);
    box-shadow: var(--shadow-glow);
}

.photo-carousel {
    position: relative;
}

.carousel-photo {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
    /* Smooth fade only */
}

.carousel-photo.active {
    position: relative;
    opacity: 1;
}

.carousel-btn {
    position: absolute;
    bottom: 10px;
    /* Moved inside the photo area */
    right: 10px;
    /* Moved inside the photo area */
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(100, 255, 218, 0.9);
    /* Slightly transparent */
    color: var(--color-bg-primary);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    z-index: 2;
}

.carousel-btn:hover {
    background: var(--color-accent);
    transform: scale(1.1);
    /* Scale instead of rotate */
}

.carousel-btn:active {
    transform: scale(0.95);
}

.about-content {
    display: flex !important;
    align-items: flex-start !important;
    gap: 1rem !important;
    /* Extremely tight gap as requested */
    max-width: 1000px;
    margin: 0 auto;
}

.about-text {
    flex: 1;
    padding-top: 2rem;
    /* Push text down slightly as requested */
    text-align: justify;
    /* Improve reading flow for tight blocks */
}

@media (max-width: 900px) {
    .about-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }

    .hero-container {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
        padding-top: 2rem;
    }

    .hero-content {
        text-align: center;
    }

    .hero-photo-wrapper .photo-carousel {
        width: 220px;
        height: 220px;
        margin: 0 auto;
    }

    .hero-description,
    .hero-tagline {
        white-space: normal !important;
        /* Force wrap on mobile */
        max-width: 100%;
        margin-left: auto;
        margin-right: auto;
    }

    .hero-tags {
        justify-content: center;
        gap: 0.5rem;
    }

    .hero-tag {
        font-size: 0.7rem;
        /* Even smaller for mobile optimization */
        padding: 0.3rem 0.5rem;
    }

    .about-text {
        text-align: left;
        /* Better readability than justify on mobile */
    }

    /* Project Card Mobile Optimization */
    .project-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .project-header .btn-sm {
        position: relative;
        top: 0;
        right: 0;
        margin-top: 5px;
    }
}

.hero-content {
    text-align: left;
    z-index: 1;
}

.hero-greeting {
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.hero-name {
    margin-bottom: var(--spacing-sm);
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.2s forwards;
}

.hero-tagline {
    font-size: clamp(1.25rem, 4vw, 2rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.4s forwards;
}

.hero-description {
    max-width: 1000px;
    /* Further increased to try to fit text on one line */
    margin: 0 0 var(--spacing-md) 0;
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.6s forwards;
    white-space: nowrap;
    /* Force single line on large screens if possible, wrap on small */
}

@media (max-width: 1200px) {
    .hero-description {
        white-space: normal;
        /* Allow wrapping on smaller screens */
    }
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-bottom: 3rem;
    /* Increased spacing to separate from buttons */
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.7s forwards;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    padding: 0.35rem 0.9rem;
    /* Slightly reduced padding */
    border: 1px solid var(--color-accent);
    border-radius: 50px;
    color: var(--color-accent);
    font-size: 0.85rem;
    /* Slightly smaller font to fit 3 in a row */
    font-weight: 500;
    background: rgba(100, 255, 218, 0.05);
    transition: all 0.3s ease;
    cursor: default;
}

.hero-tag:hover {
    background: rgba(100, 255, 218, 0.15);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(100, 255, 218, 0.2);
}

.hero-cta {
    display: inline-flex;
    gap: var(--spacing-md);
    /* Increased gap between buttons */
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.8s forwards;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 1px solid transparent;
}

.btn-primary {
    background: transparent;
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.btn-primary:hover {
    background: var(--color-accent-glow);
    box-shadow: var(--shadow-glow);
}

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

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

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    animation: fadeIn 1s ease 1.2s forwards, bounce 2s infinite 1.5s;
}

.scroll-indicator span {
    display: block;
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-accent);
    border-radius: 12px;
    position: relative;
}

.scroll-indicator span::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 2px;
    animation: scrollDot 2s infinite;
}

/* Cards */
.card {
    position: relative;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    border: 1px solid var(--color-bg-tertiary);
    transition: all var(--transition-normal);
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(100, 255, 218, 0.1), transparent);
    transition: left 0.5s;
}

.card:hover::before {
    left: 100%;
}

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

.card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-glow);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--color-accent);
    font-size: 1.5rem;
}

.card-title {
    margin-bottom: var(--spacing-xs);
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-accent);
    background: var(--color-accent-glow);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

/* Grid Layouts */
/* Grid Layouts */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

/* Toolkit Grid definition removed (duplicate) */

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.about-text {
    color: var(--color-text-secondary);
}

.about-text p {
    margin-bottom: var(--spacing-md);
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: 2rem;
    /* Push GPA down as requested */
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-accent);
}

.highlight-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
}

.highlight-label {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

/* Project Section */
.project-card {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid var(--color-bg-tertiary);
    margin-bottom: 2rem;
    /* Add spacing between project cards */
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.project-links {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    /* Center align button */
}

.project-links .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    padding: 8px 16px;
    /* Enhance visibility */
    background: rgba(100, 255, 218, 0.1);
    border: 1px solid var(--color-accent);
}

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

.project-links a {
    color: var(--color-text-secondary);
    font-size: 1.25rem;
    transition: color var(--transition-fast);
}

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

.project-description {
    margin-bottom: var(--spacing-md);
}

.project-features {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.project-features li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-secondary);
}

.project-features li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* Toolkit Section */
.toolkit {
    background-color: var(--color-bg-primary);
    position: relative;
    padding: 100px 20px;
}

.toolkit-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

/* Toolkit Card Specifics (Inherits from .card) */
.toolkit-card {
    height: 100%;
}

.toolkit-card ol {
    list-style-position: inside;
    color: var(--color-text-secondary);
    font-family: 'Space Mono', monospace;
    font-size: 0.9rem;
    padding-left: 0;
    margin-top: 15px;
}

.toolkit-card li {
    margin-bottom: 12px;
    line-height: 1.6;
    transition: color 0.3s ease;
}

.toolkit-card li:hover {
    color: var(--color-text-primary);
    transform: translateX(5px);
    display: inline-block;
}

@media (max-width: 768px) {
    .toolkit-grid {
        grid-template-columns: 1fr;
    }
}

/* Contact Section */
.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-title {
    margin-bottom: var(--spacing-sm);
}

.contact-description {
    margin-bottom: var(--spacing-md);
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.contact-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-bg-tertiary);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.contact-link:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-3px);
}

/* Copy Hint Label */
.copy-hint {
    display: block;
    font-size: 0.7rem;
    color: var(--color-accent);
    margin-top: 4px;
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.contact-link:hover .copy-hint {
    opacity: 1;
}

.contact-info {
    font-size: 0.95rem;
    margin-bottom: 4px;
}

/* Footer */
.footer {
    padding: var(--spacing-md) 0;
    text-align: center;
    border-top: 1px solid var(--color-bg-tertiary);
}

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

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    40% {
        transform: translateX(-50%) translateY(-10px);
    }

    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@keyframes scrollDot {
    0% {
        opacity: 1;
        top: 8px;
    }

    100% {
        opacity: 0;
        top: 20px;
    }
}

/* Reveal Animation */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-bg-secondary);
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .hero-cta {
        flex-direction: column;
    }

    .contact-links {
        flex-direction: column;
        align-items: center;
    }

    section {
        padding: var(--spacing-lg) 0;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

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

/* ===================================
   Project Modal System
   =================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 25, 47, 0.85);
    backdrop-filter: blur(5px);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background: var(--color-bg-secondary);
    width: 90%;
    max-width: 600px;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-accent);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 20px;
    background: none;
    border: none;
    color: var(--color-text-secondary);
    font-size: 2rem;
    cursor: pointer;
    transition: color 0.3s ease;
}

.modal-close:hover {
    color: var(--color-accent);
}

.modal-header {
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-bg-tertiary);
    padding-bottom: var(--spacing-sm);
}

.modal-header h3 {
    color: var(--color-accent);
    margin: 0;
}

.modal-body {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.modal-body p {
    margin-bottom: var(--spacing-sm);
}

.modal-body ul {
    list-style-position: inside;
    margin-bottom: var(--spacing-md);
}

.modal-body li {
    margin-bottom: 8px;
}

.modal-actions {
    margin-top: var(--spacing-md);
    display: flex;
    justify-content: flex-end;
}

@media (max-width: 480px) {
    .modal {
        padding: var(--spacing-md);
        width: 95%;
    }
}

/* ===================================
   Redesigned Contact Section
   =================================== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-bg-tertiary);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    color: inherit;
}

.contact-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

.contact-icon {
    font-size: 2rem;
    color: var(--color-accent);
}

.contact-icon svg {
    width: 2rem;
    height: 2rem;
    color: var(--color-accent);
}

.contact-label {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.contact-value {
    font-size: 1rem;
    color: var(--color-text-primary);
    font-weight: 500;
}

.contact-card .copy-hint {
    font-size: 0.7rem;
    color: var(--color-accent);
    opacity: 0.8;
    margin-top: var(--spacing-xs);
}

.contact-card-link:hover .contact-icon svg {
    transform: scale(1.1);
    transition: transform var(--transition-fast);
}

/* ===================================
   Back to Top Button
   =================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--color-accent);
    color: var(--color-bg-primary);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 99;
    box-shadow: 0 4px 15px rgba(100, 255, 218, 0.3);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(100, 255, 218, 0.5);
}

@media (max-width: 480px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}