/* ═══════════════════════════════════════════════════════════════
   THE REFRACTORIES PHOTO BANK — Design System
   U19 Chemical Engineering, ABU Zaria — Class of 2024
   
   Dark theme with warm gold accents, glassmorphism, 
   micro-animations, and mobile-first responsive design.
   ═══════════════════════════════════════════════════════════════ */

/* ─── Google Fonts ─── */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Inter:wght@300;400;500;600&display=swap');

/* ─── CSS Custom Properties ─── */
:root {
  /* Backgrounds */
  --bg-primary: #07070c;
  --bg-secondary: #0e0e16;
  --bg-tertiary: #14141e;
  --bg-card: rgba(255, 255, 255, 0.025);
  --bg-card-hover: rgba(255, 255, 255, 0.05);
  --bg-input: rgba(255, 255, 255, 0.04);
  --bg-input-focus: rgba(255, 255, 255, 0.07);

  /* Glass */
  --glass: rgba(255, 255, 255, 0.04);
  --glass-strong: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.06);
  --glass-border-hover: rgba(255, 255, 255, 0.12);

  /* Text */
  --text-primary: #f0ebe3;
  --text-secondary: #7e7a8a;
  --text-tertiary: #4e4a56;
  --text-accent: #e8a838;

  /* Accent — warm gold (refractories = heat, ceramics, warmth) */
  --accent: #e8a838;
  --accent-hover: #f0b848;
  --accent-muted: rgba(232, 168, 56, 0.15);
  --accent-glow: rgba(232, 168, 56, 0.08);
  --accent-gradient: linear-gradient(135deg, #e8a838 0%, #d4730d 100%);

  /* Status */
  --success: #4ade80;
  --success-muted: rgba(74, 222, 128, 0.12);
  --error: #f87171;
  --error-muted: rgba(248, 113, 113, 0.12);
  --warning: #fbbf24;
  --info: #60a5fa;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(232, 168, 56, 0.1);

  /* Borders */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Typography */
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;

  /* Layout */
  --nav-height: 64px;
  --nav-height-mobile: 72px;
  --sidebar-width: 280px;
  --max-width: 1400px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  color-scheme: dark;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Ambient background effect */
body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(circle at 20% 20%, rgba(232, 168, 56, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(212, 115, 13, 0.02) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

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

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

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

button {
  font-family: var(--font-body);
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  font-size: inherit;
}

input, select, textarea {
  font-family: var(--font-body);
  font-size: 1rem;
}

/* ─── Custom Scrollbar ─── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ─── Typography ─── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 { font-size: clamp(1.75rem, 5vw, 2.75rem); font-weight: 700; }
h2 { font-size: clamp(1.35rem, 3.5vw, 2rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.1rem; }

.text-accent { color: var(--text-accent); }
.text-secondary { color: var(--text-secondary); }
.text-center { text-align: center; }

/* ─── Navigation ─── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(7, 7, 12, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  z-index: 1000;
  display: flex;
  align-items: center;
  padding: 0 var(--space-lg);
  transition: background var(--duration-normal) var(--ease-out);
}

.nav-inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
  white-space: nowrap;
}

.nav-brand .brand-icon {
  width: 32px;
  height: 32px;
  background: var(--accent-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.nav-brand .brand-sub {
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--text-secondary);
  display: block;
  line-height: 1;
  margin-top: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--duration-fast) var(--ease-out);
  position: relative;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 2px;
  background: var(--accent);
  border-radius: var(--radius-full);
}

.nav-link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* Mobile bottom nav */
@media (max-width: 640px) {
  .nav {
    top: auto;
    bottom: 0;
    height: var(--nav-height-mobile);
    border-bottom: none;
    border-top: 1px solid var(--glass-border);
    padding-bottom: env(safe-area-inset-bottom, 0);
  }

  .nav-brand {
    display: none;
  }

  .nav-links {
    width: 100%;
    justify-content: space-around;
  }

  .nav-link {
    flex-direction: column;
    gap: 2px;
    font-size: 0.7rem;
    padding: var(--space-xs) var(--space-sm);
  }

  .nav-link.active::after {
    top: -1px;
    bottom: auto;
  }
}

/* ─── Main Content Area ─── */
.main-content {
  padding-top: calc(var(--nav-height) + var(--space-lg));
  padding-bottom: var(--space-3xl);
  min-height: 100vh;
  min-height: 100dvh;
  position: relative;
  z-index: 1;
}

@media (max-width: 640px) {
  .main-content {
    padding-top: var(--space-lg);
    padding-bottom: calc(var(--nav-height-mobile) + var(--space-xl) + env(safe-area-inset-bottom, 0));
  }
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-xl);
  }
}

/* ─── Hero Section ─── */
.hero {
  text-align: center;
  padding: var(--space-2xl) 0;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(232, 168, 56, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: var(--accent-muted);
  border: 1px solid rgba(232, 168, 56, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero h1 {
  margin-bottom: var(--space-sm);
}

.hero h1 .gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  max-width: 500px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ─── Stats Bar ─── */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  padding: var(--space-lg) 0;
  margin: var(--space-lg) 0;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ─── Filter Bar ─── */
.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) 0;
  margin-bottom: var(--space-md);
  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
  position: sticky;
  top: var(--nav-height);
  z-index: 100;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--glass-border);
}

.filter-bar::-webkit-scrollbar {
  display: none;
}

@media (max-width: 640px) {
  .filter-bar {
    position: sticky;
    top: 0;
  }
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: nowrap;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  flex-shrink: 0;
}

.filter-chip:hover,
.filter-chip.active {
  background: var(--accent-muted);
  border-color: rgba(232, 168, 56, 0.3);
  color: var(--accent);
}

.filter-chip.active {
  font-weight: 500;
}

.search-input-wrap {
  position: relative;
  flex: 1;
  min-width: 180px;
}

.search-input-wrap svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--text-tertiary);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md) var(--space-sm) 36px;
  background: var(--bg-input);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-size: 0.85rem;
  outline: none;
  transition: all var(--duration-fast) var(--ease-out);
}

.search-input::placeholder {
  color: var(--text-tertiary);
}

.search-input:focus {
  background: var(--bg-input-focus);
  border-color: var(--glass-border-hover);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.filter-select {
  padding: var(--space-sm) var(--space-md);
  padding-right: 32px;
  background: var(--bg-input);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-size: 0.8rem;
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%237e7a8a' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  transition: all var(--duration-fast) var(--ease-out);
  flex-shrink: 0;
}

.filter-select:focus {
  border-color: var(--glass-border-hover);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.filter-select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* ─── Photo Grid ─── */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
}

@media (min-width: 480px) {
  .photo-grid {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  }
}

@media (min-width: 768px) {
  .photo-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-md);
  }
}

@media (min-width: 1200px) {
  .photo-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
}

.photo-card {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  background: var(--bg-tertiary);
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.photo-card:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-md);
}

.photo-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}

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

.photo-card .photo-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-sm);
}

.photo-card:hover .photo-overlay {
  opacity: 1;
}

.photo-overlay .photo-date {
  font-size: 0.7rem;
  color: rgba(255, 255, 255, 0.7);
}

.photo-overlay .photo-event {
  font-size: 0.75rem;
  color: white;
  font-weight: 500;
}

/* Skeleton loading */
.photo-card.skeleton {
  background: var(--bg-tertiary);
  cursor: default;
}

.photo-card.skeleton::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.03) 50%,
    transparent 100%
  );
  animation: skeleton-shimmer 1.5s infinite;
}

@keyframes skeleton-shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* ─── Lightbox ─── */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}

.lightbox.open {
  opacity: 1;
  visibility: visible;
}

.lightbox-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  flex-shrink: 0;
}

.lightbox-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.lightbox-info .lb-event {
  font-weight: 600;
  font-size: 0.95rem;
}

.lightbox-info .lb-meta {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.lightbox-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.lightbox-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  transition: all var(--duration-fast) var(--ease-out);
}

.lightbox-btn:hover {
  background: var(--glass-strong);
}

.lightbox-btn svg {
  width: 18px;
  height: 18px;
}

.lightbox-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: var(--space-md);
}

.lightbox-body img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: var(--radius-sm);
  user-select: none;
  -webkit-user-drag: none;
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  transition: all var(--duration-fast) var(--ease-out);
  z-index: 10;
}

.lightbox-nav:hover {
  background: var(--glass-strong);
  transform: translateY(-50%) scale(1.05);
}

.lightbox-nav.prev { left: var(--space-md); }
.lightbox-nav.next { right: var(--space-md); }

.lightbox-nav svg {
  width: 20px;
  height: 20px;
}

@media (max-width: 640px) {
  .lightbox-nav {
    width: 36px;
    height: 36px;
  }
  .lightbox-nav.prev { left: var(--space-xs); }
  .lightbox-nav.next { right: var(--space-xs); }
}

.lightbox-counter {
  text-align: center;
  padding: var(--space-sm);
  font-size: 0.75rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}

/* ─── Upload Page ─── */
.upload-layout {
  max-width: 800px;
  margin: 0 auto;
}

.upload-step {
  margin-bottom: var(--space-xl);
}

.step-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.step-number {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-muted);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
  border: 1px solid rgba(232, 168, 56, 0.2);
}

.step-number.completed {
  background: var(--success-muted);
  color: var(--success);
  border-color: rgba(74, 222, 128, 0.2);
}

.step-header h3 {
  font-size: 1.1rem;
}

/* Form Fields */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 12px var(--space-md);
  background: var(--bg-input);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: all var(--duration-fast) var(--ease-out);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-tertiary);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  background: var(--bg-input-focus);
  border-color: rgba(232, 168, 56, 0.3);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-hint {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: var(--space-xs);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

@media (max-width: 480px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

/* Drop Zone */
.drop-zone {
  position: relative;
  border: 2px dashed var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  background: var(--bg-input);
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.drop-zone.drag-over {
  transform: scale(1.01);
}

.drop-zone-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  display: block;
}

.drop-zone-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: var(--space-sm);
}

.drop-zone-hint {
  color: var(--text-tertiary);
  font-size: 0.8rem;
}

.drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

/* Preview Grid (selected images before upload) */
.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

@media (min-width: 480px) {
  .preview-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  }
}

.preview-item {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-tertiary);
}

.preview-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.preview-item .remove-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.6);
  color: white;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.preview-item:hover .remove-btn {
  opacity: 1;
}

/* Upload Progress */
.upload-progress-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-height: 400px;
  overflow-y: auto;
}

.upload-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.upload-item.success {
  border-color: rgba(74, 222, 128, 0.15);
}

.upload-item.error {
  border-color: rgba(248, 113, 113, 0.15);
}

.upload-item-thumb {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
}

.upload-item-info {
  flex: 1;
  min-width: 0;
}

.upload-item-name {
  font-size: 0.8rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 500;
}

.upload-item-status {
  font-size: 0.7rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.upload-item-status.success { color: var(--success); }
.upload-item-status.error { color: var(--error); }

.progress-bar-track {
  width: 100%;
  height: 3px;
  background: var(--glass);
  border-radius: var(--radius-full);
  margin-top: 4px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  transition: width var(--duration-fast) linear;
  width: 0%;
}

.progress-bar-fill.success {
  background: var(--success);
}

.progress-bar-fill.error {
  background: var(--error);
}

.upload-item-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

/* Overall progress summary */
.upload-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
}

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

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

.upload-overall-progress {
  width: 100%;
  height: 6px;
  background: var(--glass);
  border-radius: var(--radius-full);
  margin-top: var(--space-sm);
  overflow: hidden;
}

.upload-overall-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  transition: width var(--duration-fast) linear;
  width: 0%;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px var(--space-lg);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font-heading);
  transition: all var(--duration-fast) var(--ease-out);
  cursor: pointer;
  border: none;
  text-decoration: none;
  white-space: nowrap;
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #0a0a0f;
  box-shadow: var(--shadow-sm), 0 0 20px rgba(232, 168, 56, 0.15);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md), 0 0 30px rgba(232, 168, 56, 0.2);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-secondary {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--glass-strong);
  border-color: var(--glass-border-hover);
}

.btn-danger {
  background: var(--error-muted);
  color: var(--error);
  border: 1px solid rgba(248, 113, 113, 0.2);
}

.btn-danger:hover {
  background: rgba(248, 113, 113, 0.2);
}

.btn-sm {
  padding: var(--space-sm) var(--space-md);
  font-size: 0.8rem;
}

.btn-lg {
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
}

.btn-block {
  width: 100%;
}

/* ─── Cards ─── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--duration-normal) var(--ease-out);
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--glass-border-hover);
}

.card-glass {
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

/* ─── Badge / Tag ─── */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.tag-accent {
  background: var(--accent-muted);
  border-color: rgba(232, 168, 56, 0.2);
  color: var(--accent);
}

/* ─── About Page ─── */
.about-hero {
  text-align: center;
  padding: var(--space-3xl) 0;
}

.about-hero .class-emblem {
  width: 100px;
  height: 100px;
  margin: 0 auto var(--space-lg);
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  box-shadow: 0 0 60px rgba(232, 168, 56, 0.15);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.about-card {
  text-align: center;
  padding: var(--space-xl);
}

.about-card-icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.about-card h4 {
  margin-bottom: var(--space-sm);
}

.about-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ─── Empty State ─── */
.empty-state {
  text-align: center;
  padding: var(--space-3xl) var(--space-xl);
  color: var(--text-secondary);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--space-md);
  opacity: 0.3;
}

.empty-state h3 {
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.empty-state p {
  max-width: 400px;
  margin: 0 auto var(--space-lg);
  font-size: 0.9rem;
}

/* ─── Toast Notifications ─── */
.toast-container {
  position: fixed;
  top: calc(var(--nav-height) + var(--space-md));
  right: var(--space-md);
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  pointer-events: none;
}

@media (max-width: 640px) {
  .toast-container {
    top: var(--space-md);
    left: var(--space-md);
    right: var(--space-md);
  }
}

.toast {
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: toast-in var(--duration-normal) var(--ease-spring);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.85rem;
}

.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--error); }
.toast.warning { border-left: 3px solid var(--warning); }

.toast.hiding {
  animation: toast-out var(--duration-fast) var(--ease-out) forwards;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(30px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

@keyframes toast-out {
  to {
    opacity: 0;
    transform: translateX(30px) scale(0.95);
  }
}

/* ─── Modal ─── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 2500;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  max-width: 480px;
  width: calc(100% - var(--space-xl) * 2);
  z-index: 2501;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-spring);
}

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

.modal h3 {
  margin-bottom: var(--space-md);
}

.modal-actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: flex-end;
  margin-top: var(--space-lg);
}

/* ─── Loading Spinner ─── */
.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--glass-border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-more {
  display: flex;
  justify-content: center;
  padding: var(--space-xl);
}

/* ─── Section Divider ─── */
.divider {
  height: 1px;
  background: var(--glass-border);
  margin: var(--space-lg) 0;
}

/* ─── Fade-in animation for page content ─── */
.fade-in {
  animation: fadeIn var(--duration-slow) var(--ease-out);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Staggered fade-in for grid items */
.photo-card {
  animation: fadeInUp var(--duration-slow) var(--ease-out) both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ─── Access Code Gate ─── */
.access-gate {
  max-width: 400px;
  margin: 0 auto;
  text-align: center;
}

.access-gate .lock-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
}

.access-gate p {
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  font-size: 0.9rem;
}

.access-code-input {
  text-align: center;
  letter-spacing: 0.15em;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  text-transform: uppercase;
}

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

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }

.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

.hidden { display: none !important; }

/* ─── Multi-Selection & Checkboxes ─── */
.photo-select-checkbox {
  position: absolute;
  top: 10px;
  left: 10px;
  width: 26px;
  height: 26px;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.6);
  border: 2px solid rgba(255, 255, 255, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #07070c;
  z-index: 10;
  opacity: 0;
  transform: scale(0.8);
  transition: all var(--duration-fast) var(--ease-spring);
  pointer-events: none;
}

.photo-select-checkbox.visible {
  opacity: 1;
  transform: scale(1);
}

.photo-select-checkbox.checked {
  background: var(--accent);
  border-color: var(--accent);
  color: #07070c;
}

.photo-select-checkbox svg {
  width: 16px;
  height: 16px;
  stroke-width: 3;
}

/* ─── Floating Bulk Action Toolbar ─── */
.bulk-toolbar {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1100;
  width: calc(100% - 32px);
  max-width: 600px;
  animation: toast-in var(--duration-normal) var(--ease-spring);
}

@media (max-width: 640px) {
  .bulk-toolbar {
    bottom: calc(var(--nav-height-mobile) + 16px);
  }
}

.bulk-toolbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: 12px 20px;
  background: rgba(14, 14, 22, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--accent);
  border-radius: var(--radius-full);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7), 0 0 20px rgba(232, 168, 56, 0.2);
}

.bulk-toolbar-info .bulk-count {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--accent);
  font-size: 0.95rem;
}

.bulk-toolbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}