@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;700&display=swap');

:root {
    /* Color Variables */
    --primary-dark: #1a1a1a;
    --secondary-dark: #232323;
    --tertiary-dark: #2d2d2d;
    --light-text: #e0e0e0;
    --white-text: #ffffff;
    --muted-text: #a0a0a0;
    --accent-teal: #f2f2f2;
    --accent-teal-dark: #cfcfcf;
    --nav-link-color: #e0e0e0;
    --focus-ring: #ffffff;
    --surface-border: rgba(255, 255, 255, 0.16);
    --surface-glow: rgba(0, 0, 0, 0.38);
    --space-1: 8px;
    --space-2: 12px;
    --space-3: 16px;
    --space-4: 24px;
}

html {
    scroll-behavior: smooth;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

/* Accessibility Improvements */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* General Styles */
body {
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    background-color: var(--primary-dark);
    background-image: linear-gradient(180deg, #1a1a1a 0%, #151515 100%);
    color: var(--light-text);
    font-family: 'DM Sans', sans-serif;
    font-size: 16px;
    line-height: 1.5;
    overflow-x: hidden;
}

img,
video,
iframe,
canvas,
svg {
    max-width: 100%;
    height: auto;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
    margin-top: 30px;
    margin-bottom: 20px;
    margin-left: 0;
    color: var(--white-text);
    font-weight: 500;
}

h1 {
    font-size: clamp(1.7rem, 4.5vw, 2.5rem);
    text-align: center;
    letter-spacing: 0.02em;
    margin: 42px auto 14px;
}

h2 {
    font-size: 2rem;
}

/* Links */
a {
    color: var(--accent-teal);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover, a:focus {
    color: var(--white-text);
    text-decoration: underline;
}

/* Skip link for keyboard users */
.skip-link {
    position: absolute;
    top: -44px;
    left: 16px;
    background: var(--white-text);
    color: #111111;
    padding: 10px 14px;
    border-radius: 6px;
    font-weight: 700;
    z-index: 9999;
    text-decoration: none;
}

.skip-link:focus-visible {
    top: 14px;
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.65);
}

:focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

/* Apply custom focus styles to interactive elements that need them for accessibility */
.nav-button:focus-visible, 
.filter-btn:focus-visible,
#back-to-top-btn:focus-visible {
    box-shadow: 0 0 0 3px rgba(139, 240, 226, 0.28);
    outline: none;
}

.gallery-item img:focus-visible,
.team-social a:focus-visible,
nav ul li a:focus-visible,
.footer-email:focus-visible,
.footer-github:focus-visible {
    box-shadow: 0 0 0 3px rgba(139, 240, 226, 0.28);
    border-radius: 6px;
}

.hero-section {
    width: min(860px, 90%);
    text-align: center;
    margin: 0 auto var(--space-4);
}

.hero-tagline {
    margin: 0 auto;
    max-width: 48ch;
    font-size: 1.15rem;
    line-height: 1.55;
    color: var(--white-text);
}

.hero-description {
    margin: 8px auto 0;
    max-width: 740px;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--muted-text);
}

.hero-section,
.project-stats,
.button-container,
.logs-panel-toggle,
.log-filter,
.logs-container {
    width: min(980px, 92%);
}

.project-stats {
    width: min(980px, 92%);
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-2);
    margin: var(--space-1) auto var(--space-4);
}

.stat-item {
    background: linear-gradient(180deg, rgba(44, 44, 44, 0.8), rgba(28, 28, 28, 0.88));
    border: 1px solid rgba(255, 255, 255, 0.13);
    border-radius: 10px;
    padding: 16px 18px;
    text-align: center;
}

.stat-value {
    margin: 0;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--white-text);
}

.stat-label {
    margin: 7px 0 0;
    font-size: 0.95rem;
    color: var(--muted-text);
}

/* Header for subpages */
header {
    width: 100%;
    background-color: var(--secondary-dark);
    padding: 10px 0;
    margin-bottom: var(--space-4);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
}

header h1 {
    text-align: center;
    margin: 10px 0;
}

/* Navigation */
nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    padding: 10px 0;
}

nav ul li {
    margin: 5px 15px;
}

nav ul li a {
    text-decoration: none;
    color: var(--nav-link-color); /* Changed from purple to light gray */
    font-size: 1.05rem;
    transition: color 0.3s ease;
    padding: 10px 12px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
}

.mobile-nav-toggle {
    display: none;
    width: 50px;
    height: 44px;
    margin: 6px 14px 0 auto;
    padding: 0;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: linear-gradient(180deg, rgba(58, 58, 58, 0.9), rgba(27, 27, 27, 0.96));
    color: var(--white-text);
    position: relative;
    overflow: hidden;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.36), inset 0 0 0 1px rgba(255, 255, 255, 0.06);
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.mobile-nav-toggle:hover {
    transform: translateY(-1px);
    border-color: rgba(255, 255, 255, 0.34);
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.42), inset 0 0 0 1px rgba(255, 255, 255, 0.1);
}

.mobile-nav-toggle:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.8);
    outline-offset: 2px;
}

.mobile-nav-toggle span,
.mobile-nav-toggle::before,
.mobile-nav-toggle::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    display: block;
    height: 2px;
    background: currentColor;
    border-radius: 99px;
    transform-origin: center;
    transition: transform 0.25s ease, opacity 0.2s ease, width 0.25s ease;
}

.mobile-nav-toggle span {
    width: 22px;
    transform: translate(-50%, -50%);
}

.mobile-nav-toggle::before {
    width: 16px;
    transform: translate(-50%, -8px);
}

.mobile-nav-toggle::after {
    width: 12px;
    transform: translate(-50%, 6px);
}

body.nav-open .mobile-nav-toggle span {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.7);
}

body.nav-open .mobile-nav-toggle::before {
    width: 20px;
    transform: translate(-50%, -50%) rotate(45deg);
}

body.nav-open .mobile-nav-toggle::after {
    width: 20px;
    transform: translate(-50%, -50%) rotate(-45deg);
}

nav ul li a:hover, nav ul li a:focus {
    color: var(--white-text);
    background-color: rgba(255, 255, 255, 0.1);
}

nav ul li a.active {
    color: var(--white-text);
    border-bottom: 2px solid var(--accent-teal);
}

/* Model Viewer Specific (index.html) */
.model-container {
    width: 100%;
    display: flex;
    justify-content: center;
    position: relative;
    margin-bottom: var(--space-4);
}

.model-container::before {
    content: "";
    position: absolute;
    width: min(960px, 92%);
    height: min(70vh, 760px);
    border: 1px solid var(--surface-border);
    border-radius: 14px;
    box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.45), 0 0 18px var(--surface-glow);
    pointer-events: none;
}

.model-hint {
    position: absolute;
    bottom: 14px;
    z-index: 3;
    margin: 0;
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(20, 20, 20, 0.84);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--light-text);
    font-size: 0.9rem;
    letter-spacing: 0.01em;
}

/* Loading Animation */
.loading-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: rgba(26, 26, 26, 0.9);
    z-index: 2;
    transition: opacity 0.5s ease;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--accent-teal);
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 15px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-container p {
    color: var(--white-text);
    font-size: 1rem;
}

model-viewer {
    width: 90%;
    max-width: 1000px;
    height: min(70vh, 760px);
    background: linear-gradient(180deg, rgba(34, 34, 34, 0.62), rgba(18, 18, 18, 0.26));
    border-radius: 14px;
}

.userInput:focus-visible {
    outline: none !important;
    box-shadow: none !important;
}

/* Button Navigation (index.html) */
.button-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.nav-button {
    padding: 12px 22px;
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 0.01em;
    color: #111111;
    background: linear-gradient(180deg, #ffffff 0%, #e7e7e7 100%);
    border: 1px solid #f5f5f5;
    border-radius: 8px;
    text-decoration: none;
    cursor: pointer;
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease, background 0.25s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-width: 130px;
    min-height: 44px;
}

.nav-button:hover, .nav-button:focus {
    background: linear-gradient(180deg, #f8f8f8 0%, #d7d7d7 100%);
    transform: translateY(-3px);
    box-shadow: 0 10px 18px rgba(0, 0, 0, 0.32);
    text-decoration: none;
    color: #111111;
    border-color: #ffffff;
}

.nav-button:active {
    transform: translateY(-1px);
}

.github-btn {
    background-color: #24292e;
    color: var(--white-text); /* Explicitly setting text color to white */
}

.github-btn:hover, .github-btn:focus {
    background-color: #444;
    color: var(--white-text);
    border-color: var(--white-text);
}

/* Contact Section */
.contact-container {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
}

.contact-btn {
    background: linear-gradient(180deg, #f6f6f6 0%, #dddddd 100%);
    border-color: #f5f5f5;
    color: #111111;
}

.contact-btn:hover, .contact-btn:focus {
    background: linear-gradient(180deg, #efefef 0%, #d2d2d2 100%);
    color: #111111;
    border-color: #ffffff;
}

/* Main content area for subpages */
main {
    width: min(900px, 92vw);
    max-width: 900px;
    margin-bottom: var(--space-4);
    padding: var(--space-3);
    background-color: var(--primary-dark);
    border-radius: 8px;
    /* box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1); */
}

/* Override main width for gallery page */
.gallery-page main {
    width: 95%;
    max-width: none;
    background-color: transparent;
    padding: 0;
}

.index-page main.model-container {
    width: 100%;
    max-width: none;
    padding: 0;
    background: transparent;
    border-radius: 0;
}

.index-page h1 {
    margin-top: 30px;
    margin-bottom: 10px;
}

.index-page .hero-section {
    margin-bottom: 18px;
}

.index-page .button-container {
    width: min(980px, 92%);
    margin-bottom: var(--space-3);
}

.team-page main,
.logs-page main {
    width: min(980px, 92vw);
}

.team-page .team-card,
.logs-page .log-entry {
    overflow: hidden;
}

.team-page .team-name,
.team-page .team-role,
.logs-page .log-header h2,
.logs-page .log-date {
    overflow-wrap: anywhere;
}

/* Gallery Styles */
.gallery-container {
    padding: 18px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    align-items: start;
}

.gallery-item {
    border-radius: 7px;
    overflow: hidden;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.45);
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.06);
    transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}

.gallery-item::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
    transform: translateX(-100%);
    animation: galleryShimmer 1.2s linear infinite;
    z-index: 1;
}

.gallery-item.image-loaded::before {
    opacity: 0;
    animation: none;
    transition: opacity 0.25s ease;
}

@keyframes galleryShimmer {
    to {
        transform: translateX(100%);
    }
}

.gallery-item:hover, .gallery-item:focus-within {
    box-shadow: 0 10px 22px rgba(0, 0, 0, 0.5);
    transform: translateY(-3px);
    border-color: rgba(255, 255, 255, 0.16);
}

.gallery-item img {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    background-color: rgba(255, 255, 255, 0.03);
    opacity: 1;
    transition: opacity 0.2s ease, transform 0.3s ease;
    cursor: pointer;
    position: relative;
    z-index: 2;
}

.gallery-item.image-loaded img {
    opacity: 1;
    transition: opacity 0.2s ease, transform 0.3s ease;
}

.gallery-item img:hover {
    transform: scale(1.03);
}

.gallery-caption {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 3;
    margin: 0;
    padding: 9px 10px;
    font-size: 0.9rem;
    line-height: 1.4;
    color: #f2f2f2;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0), rgba(12, 12, 12, 0.9) 60%);
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.25s ease, transform 0.25s ease;
    pointer-events: none;
}

.gallery-item:hover .gallery-caption,
.gallery-item:focus-within .gallery-caption {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive adjustments for Gallery grid */
@media (max-width: 960px) {
    .gallery-container {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 520px) {
    .gallery-container {
        padding: 10px;
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .gallery-item {
        width: 100%;
    }
    
    .gallery-item img {
        max-width: 100%;
        height: auto;
        object-fit: contain;
    }

    .gallery-caption {
        opacity: 1;
        transform: translateY(0);
        font-size: 0.84rem;
        background: linear-gradient(180deg, rgba(0, 0, 0, 0.25), rgba(10, 10, 10, 0.9) 72%);
    }
}

/* Logs Page Styles */
.log-filter {
    margin-bottom: 25px;
    background-color: var(--tertiary-dark);
    padding: 15px;
    border-radius: 6px;
    position: sticky;
    top: 12px;
    z-index: 5;
    max-width: 980px;
    width: 100%;
    box-sizing: border-box;
    border: 1px solid rgba(255, 255, 255, 0.09);
    overflow: hidden;
    transform-origin: top;
    transition: max-height 0.35s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.22s ease, transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1), margin-bottom 0.22s ease;
    max-height: 220px;
    opacity: 1;
    transform: translateY(0) scaleY(1);
}

.log-filter.is-collapsed {
    max-height: 0;
    opacity: 0;
    transform: translateY(-8px) scaleY(0.98);
    pointer-events: none;
    margin-bottom: 8px;
}

.logs-panel-toggle {
    margin: 0 auto 10px;
    width: auto;
    min-width: 190px;
    padding: 10px 14px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    background: linear-gradient(180deg, rgba(58, 58, 58, 0.9), rgba(36, 36, 36, 0.95));
    color: var(--white-text);
    font-size: 0.92rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    min-height: 44px;
}

.logs-panel-toggle:hover,
.logs-panel-toggle:focus-visible {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.35);
    border-color: rgba(255, 255, 255, 0.34);
}

.log-filter label {
    display: block;
    margin-bottom: 8px;
}

.log-filter input {
    width: 100%;
    padding: 10px 12px;
    margin-bottom: 10px;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid #444;
    border-radius: 4px;
    color: var(--white-text);
    min-height: 44px;
    font-size: 1rem;
}

.filter-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 14px;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid #444;
    border-radius: 4px;
    color: var(--light-text);
    cursor: pointer;
    transition: transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
    min-height: 44px;
    font-size: 1rem;
}

.filter-btn:hover, .filter-btn:focus {
    background-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
}

.filter-btn.active {
    background-color: var(--accent-teal);
    color: #111111;
    border-color: var(--accent-teal);
}

.logs-container {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    max-width: 980px;
    margin: 0 auto;
    padding-left: 18px;
}

.logs-container::before {
    content: "";
    position: absolute;
    top: 4px;
    bottom: 4px;
    left: 0;
    width: 2px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.18), rgba(255, 255, 255, 0.05));
}

.log-year-marker {
    align-self: flex-start;
    margin: 8px 0 2px;
    padding: 6px 12px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 999px;
    color: var(--light-text);
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    background: rgba(20, 20, 20, 0.7);
    position: relative;
    left: -18px;
}

.log-entry {
    position: relative;
    background-color: var(--tertiary-dark);
    padding: 15px 16px;
    border-radius: 8px;
    box-shadow: 0 1px 6px rgba(0, 0, 0, 0.38);
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: transform 0.24s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.24s ease, border-color 0.24s ease;
}

.log-entry::before {
    content: "";
    position: absolute;
    left: -23px;
    top: 20px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #f2f2f2;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
}

.log-entry.is-hidden {
    display: none;
}

.log-entry:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.45);
    border-color: rgba(255, 255, 255, 0.16);
}

.log-header {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
    align-items: baseline;
    margin-bottom: 10px;
    border-bottom: 1px solid #444;
    padding-bottom: 8px;
    cursor: pointer;
}

.log-header:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.7);
    outline-offset: 3px;
    border-radius: 6px;
}

.log-header h2 {
    margin: 0;
    color: var(--white-text);
    font-size: 1.4em;
}

.log-date {
    color: var(--muted-text);
    font-size: 0.9em;
    white-space: normal;
    text-align: right;
    margin-left: 15px;
}

.log-content p {
    margin: 0;
    line-height: 1.6;
    overflow-wrap: anywhere;
}

.log-entry.collapsed .log-content {
    display: none;
}

.log-entry.collapsed .log-header {
    margin-bottom: 0;
    border-bottom-color: transparent;
}

.log-entry.collapsed .log-header h2::after {
    content: " (collapsed)";
    color: var(--muted-text);
    font-size: 0.82rem;
    font-weight: 400;
}

.log-content ol, .log-content ul {
    padding-left: 25px;
    margin-top: 10px;
}

.log-content li {
    margin-bottom: 5px;
    overflow-wrap: anywhere;
}

.log-link {
    color: #bb86fc;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.log-link:hover,
.log-link:focus-visible {
    color: #d7b6ff;
}

.log-year-marker.is-hidden {
    display: none;
}

.logs-empty-state {
    margin: 8px 0 0;
    padding: 14px 16px;
    border-radius: 8px;
    border: 1px dashed rgba(255, 255, 255, 0.25);
    color: var(--muted-text);
    background: rgba(20, 20, 20, 0.5);
}

footer {
    box-sizing: border-box;
    padding-inline: 12px;
}

.user-name {
    font-style: italic;
    color: var(--accent-teal);
}

/* Team Page Styles */
.team-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-4);
    padding: var(--space-2);
    width: 100%;
    box-sizing: border-box;
}

.team-card {
    background-color: var(--tertiary-dark);
    padding: 22px 18px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: transform 0.25s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.25s ease, border-color 0.25s ease;
}

.team-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.7);
    border-color: rgba(255, 255, 255, 0.16);
}

.team-avatar {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 16px;
    border: 4px solid #444;
    transition: all 0.3s ease;
}

.team-card:hover .team-avatar {
    border-color: var(--accent-teal);
    transform: scale(1.05);
}

.team-name {
    margin-top: 0;
    margin-bottom: 6px;
    color: var(--white-text);
    font-size: 1.5em;
}

.team-role {
    color: var(--accent-teal);
    font-size: 1.1em;
    font-style: italic;
    margin-bottom: 15px;
}

.team-social {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 15px;
}

.team-social a {
    color: var(--light-text);
    font-size: 1.2em;
    transition: all 0.3s ease;
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
}

.team-social a:hover {
    color: var(--accent-teal);
    transform: scale(1.2);
}

/* Animation classes */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.45s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.45s cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .animate-on-scroll,
    .log-entry,
    .team-card,
    .gallery-item,
    .logs-panel-toggle,
    .log-filter {
        transition: none !important;
        animation: none !important;
    }
}

/* Back to Top Button */
#back-to-top-btn {
    display: inline-block;
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 99;
    border: none;
    outline: none;
    background-color: var(--accent-teal);
    color: #111111;
    cursor: pointer;
    padding: 10px 15px;
    border-radius: 5px;
    font-size: 18px;
    text-decoration: none;
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    min-width: 44px;
    min-height: 44px;
}

#back-to-top-btn:hover {
    background-color: var(--accent-teal-dark);
    transform: translateY(-3px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
}

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

/* Footer */
footer {
    margin-top: auto;
    padding: var(--space-3) 0;
    text-align: center;
    color: var(--muted-text);
    width: 100%;
    background-color: #1f1f1f;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

footer a {
    color: var(--accent-teal);
    margin: 0 10px;
}

footer a:hover {
    color: var(--accent-teal);
}

footer p {
    margin: 0 0 8px;
}

/* Contact Section */
/* Responsive Design */
@media (max-width: 1024px) {
    main {
        width: min(940px, 94vw);
    }

    .project-stats,
    .hero-section,
    .button-container,
    .logs-panel-toggle,
    .log-filter,
    .logs-container {
        width: min(940px, 94vw);
    }

    .gallery-container {
        gap: 12px;
        padding: 14px;
    }

    .index-page .button-container {
        gap: 14px;
    }

    .team-page .team-container {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 1.9rem;
        line-height: 1.2;
        margin-top: 28px;
    }

    header {
        margin-bottom: var(--space-3);
    }

    .mobile-nav-toggle {
        display: inline-flex;
    }

    header nav {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.28s ease;
    }

    body.nav-open header nav {
        max-height: 420px;
    }

    nav ul {
        gap: 6px;
        padding: 10px 12px 14px;
        flex-direction: column;
        align-items: stretch;
    }

    nav ul li {
        margin: 0;
    }

    nav ul li a {
        font-size: 1rem;
        padding: 10px 12px;
        justify-content: flex-start;
        width: 100%;
    }
    
    .hero-tagline {
        font-size: 1rem;
    }

    .hero-description {
        font-size: 1rem;
        line-height: 1.55;
    }

    .project-stats {
        grid-template-columns: 1fr;
        gap: 10px;
        margin-bottom: var(--space-4);
    }

    .stat-item {
        padding: 13px 14px;
    }

    .model-container {
        height: clamp(300px, 52vh, 460px);
    }

    .model-container::before {
        height: clamp(300px, 52vh, 460px);
    }
    
    model-viewer {
        height: clamp(300px, 52vh, 460px);
    }
    
    main {
        width: 90%;
        padding: var(--space-2);
    }
    
    .gallery-page main {
        width: 100%;
        padding: 0;
        margin-bottom: var(--space-3);
    }

    .team-page main,
    .logs-page main {
        margin-bottom: var(--space-3);
    }
    
    .team-container {
        gap: var(--space-3);
    }
    
    .nav-button {
        padding: 10px 15px;
        font-size: 1rem;
        min-width: 120px;
    }

    .model-hint {
        font-size: 0.95rem;
        padding: 7px 10px;
        max-width: calc(100% - 28px);
        text-align: center;
    }

    .log-filter {
        top: 8px;
        width: 100%;
    }

    .logs-panel-toggle {
        width: 100%;
        min-width: 0;
        text-align: center;
    }

    .filter-buttons {
        gap: 8px;
    }

    .filter-btn {
        flex: 1 1 calc(50% - 8px);
        min-width: 92px;
    }

    .logs-container {
        padding-left: 0;
    }

    .logs-container::before,
    .log-entry::before {
        display: none;
    }

    .log-header {
        grid-template-columns: 1fr;
        gap: 4px;
    }

    .log-date {
        margin-left: 0;
        text-align: left;
    }
    
    .contact-container {
        padding: 15px;
    }
    
    .index-page h1 {
        margin-top: 20px;
        margin-bottom: 8px;
    }

    .index-page .hero-section {
        width: min(860px, 94vw);
        margin-bottom: 14px;
    }

    .index-page .button-container {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
        width: min(860px, 94vw);
    }

    .index-page .nav-button,
    .index-page .contact-btn {
        width: 100%;
        min-width: 0;
    }

    .team-page .team-container {
        grid-template-columns: 1fr;
        padding: 10px;
    }

    .team-page .team-card,
    .logs-page .log-entry,
    .gallery-page .gallery-item {
        border-radius: 10px;
    }

    .logs-page .log-filter {
        top: 6px;
    }

    .logs-page .logs-container {
        gap: var(--space-2);
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.55rem;
    }
    
    h2 {
        font-size: clamp(1.25rem, 5.3vw, 1.45rem);
    }
    
    nav ul {
        gap: 6px;
    }
    
    .team-avatar {
        width: 120px;
        height: 120px;
    }
    
    .gallery-container {
        padding: 6px;
        gap: 10px;
    }

    .log-entry {
        padding: 13px 12px;
    }

    .log-content p,
    .log-content li,
    .filter-btn,
    .log-filter input {
        font-size: 1rem;
    }

    .team-card {
        padding: 18px 14px;
    }

    footer {
        font-size: 1rem;
    }

    footer a {
        display: inline-block;
        margin: 4px 8px;
    }
    
    #back-to-top-btn {
        bottom: 14px;
        right: 12px;
        width: 44px;
        height: 44px;
        padding: 0;
        border-radius: 10px;
        font-size: 14px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .index-page .button-container {
        grid-template-columns: repeat(6, minmax(0, 1fr));
        width: 94vw;
        gap: 7px;
        margin-bottom: 10px;
    }

    .index-page .button-container .nav-button {
        grid-column: span 2;
    }

    .index-page .button-container .contact-btn {
        grid-column: 1 / -1;
    }

    .index-page .nav-button,
    .index-page .contact-btn {
        font-size: 0.86rem;
        padding: 7px 6px;
        min-height: 44px;
        letter-spacing: 0;
    }

    .index-page .hero-section,
    .index-page .project-stats {
        width: 94vw;
    }

    .index-page .project-stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 8px;
        margin-top: 8px;
        margin-bottom: var(--space-2);
    }

    .index-page .project-stats .stat-item:last-child {
        grid-column: 1 / -1;
    }

    .index-page .model-container {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 0;
        margin-bottom: var(--space-3);
    }

    .index-page model-viewer,
    .index-page .model-container::before {
        height: clamp(300px, 52vh, 390px);
    }

    .index-page .model-container::before {
        display: none;
    }

    .index-page model-viewer {
        width: 92vw;
        max-width: 92vw;
    }

    .index-page .hero-tagline,
    .index-page .hero-description {
        line-height: 1.5;
    }

    .index-page .hero-description {
        max-width: 44ch;
        margin-top: 6px;
    }

    .index-page .model-hint {
        display: none;
    }

    .team-page .team-card,
    .logs-page .log-entry {
        padding: 14px 12px;
    }

    .index-page footer {
        padding-top: 12px;
        padding-bottom: 16px;
    }

    footer p {
        margin-bottom: 6px;
    }

    .index-page footer a {
        margin: 4px 6px;
    }

    .index-page .footer-email {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        line-height: 1.25;
        font-size: 0.95rem;
    }

    .index-page .footer-github {
        display: block;
        margin-top: 2px;
        font-size: 1.05rem;
    }

    /* Phone flow: title -> intro -> model -> quick actions -> stats -> footer */
    .index-page > h1 {
        order: 1;
    }

    .index-page > .hero-section {
        order: 2;
    }

    .index-page > .button-container {
        order: 4;
    }

    .index-page > main.model-container {
        order: 3;
    }

    .index-page > .project-stats {
        order: 5;
    }

    .index-page > footer {
        order: 6;
    }

    .logs-page .filter-buttons {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 380px) {
    h1 {
        font-size: 1.42rem;
    }

    .hero-tagline,
    .hero-description {
        font-size: 1rem;
    }

    .model-container,
    .model-container::before,
    model-viewer {
        height: 280px;
    }

    .index-page model-viewer {
        width: 92vw;
        height: 280px;
    }

    .index-page .button-container {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .index-page .button-container .nav-button {
        grid-column: auto;
    }

    .index-page .nav-button,
    .index-page .contact-btn {
        font-size: 0.82rem;
    }

    .stat-value {
        font-size: 1.15rem;
    }

    .stat-label {
        font-size: 0.86rem;
    }
}

@media (min-width: 769px) {
    header nav {
        max-height: none !important;
    }
}

@media (pointer: coarse) {
    .nav-button:hover,
    .team-card:hover,
    .gallery-item:hover,
    .log-entry:hover {
        transform: none;
    }

    .nav-button:active,
    .filter-btn:active,
    .team-social a:active,
    nav ul li a:active,
    .logs-panel-toggle:active,
    .gallery-item img:active {
        transform: scale(0.98);
    }

    .gallery-item img:hover {
        transform: none;
    }
}