/* ===== Variables ===== */
:root {
  --bg: #0a0a14;
  --surface: #12121e;
  --surface2: #1a1a2e;
  --border: #2a2a3e;
  --text: #e0e0e8;
  --text-dim: #8888a0;
  --accent: #00d4ff;
  --accent-dark: #0099bb;
  --accent-glow: rgba(0, 212, 255, 0.15);
  --danger: #ff4466;
  --success: #00e676;
  --radius: 12px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  min-height: 100dvh;
  -webkit-tap-highlight-color: transparent;
}

#app {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
  min-height: 100vh;
}

/* ===== Header ===== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

.logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.icon-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-dim);
  padding: 0.5rem;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-btn:hover { color: var(--text); border-color: var(--text-dim); }

/* ===== Sections ===== */
.section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

/* ===== Upload ===== */
.upload-info { text-align: center; }

.info-text {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.info-hint {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.dropzone {
  width: 100%;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
  background: var(--surface);
}

.dropzone:hover,
.dropzone.dragover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.dropzone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-dim);
}

.dropzone-text { font-size: 1rem; font-weight: 500; color: var(--text); }
.dropzone-sub { font-size: 0.8rem; }

.upload-actions {
  display: flex;
  gap: 0.5rem;
}

/* Photo Grid */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 0.5rem;
  width: 100%;
}

.photo-item {
  position: relative;
  aspect-ratio: 1;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
  animation: photo-in 0.3s ease-out;
}

@keyframes photo-in {
  from { opacity: 0; transform: scale(0.8); }
  to { opacity: 1; transform: scale(1); }
}

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

.photo-item .remove-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(0,0,0,0.7);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s;
}

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

/* Touch: always show remove */
@media (hover: none) {
  .photo-item .remove-btn { opacity: 1; }
}

.photo-count {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font);
  font-weight: 600;
  cursor: pointer;
  border: none;
  border-radius: 8px;
  transition: all 0.2s;
  white-space: nowrap;
  -webkit-user-select: none;
  user-select: none;
}

.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  color: #000;
  padding: 0.65rem 1.5rem;
  font-size: 0.95rem;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-dark);
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:active:not(:disabled) { transform: scale(0.97); }

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.55rem 1.2rem;
  font-size: 0.9rem;
}

.btn-outline:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-lg { padding: 0.8rem 2rem; font-size: 1rem; width: 100%; justify-content: center; }

.btn-sm { padding: 0.4rem 0.8rem; font-size: 0.8rem; }

/* ===== Processing ===== */
.processing-visual {
  width: 100px;
  height: 100px;
  perspective: 400px;
  margin: 2rem 0;
}

.cube-spinner {
  width: 60px;
  height: 60px;
  position: relative;
  transform-style: preserve-3d;
  animation: cube-spin 3s linear infinite;
  margin: 20px auto;
}

@keyframes cube-spin {
  0% { transform: rotateX(0deg) rotateY(0deg); }
  100% { transform: rotateX(360deg) rotateY(360deg); }
}

.cube-face {
  position: absolute;
  width: 60px;
  height: 60px;
  border: 2px solid var(--accent);
  background: rgba(0, 212, 255, 0.05);
  opacity: 0.7;
}

.cube-face.front  { transform: translateZ(30px); }
.cube-face.back   { transform: rotateY(180deg) translateZ(30px); }
.cube-face.left   { transform: rotateY(-90deg) translateZ(30px); }
.cube-face.right  { transform: rotateY(90deg) translateZ(30px); }
.cube-face.top    { transform: rotateX(90deg) translateZ(30px); }
.cube-face.bottom { transform: rotateX(-90deg) translateZ(30px); }

.processing-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text);
}

.processing-sub {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.progress-bar-wrap {
  width: 100%;
  max-width: 300px;
  height: 4px;
  background: var(--surface2);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  width: 0%;
  transition: width 0.5s ease-out;
}

.processing-status {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-family: monospace;
}

/* ===== 3D Viewer ===== */
.viewer-wrap {
  width: 100%;
  aspect-ratio: 4/3;
  max-height: 500px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  touch-action: none;
}

#viewer3d {
  width: 100%;
  height: 100%;
  display: block;
}

.viewer-hint {
  position: absolute;
  bottom: 0.75rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  color: var(--text-dim);
  background: rgba(0,0,0,0.6);
  padding: 0.3rem 0.75rem;
  border-radius: 20px;
  pointer-events: none;
  transition: opacity 1s;
}

.viewer-hint.hidden { opacity: 0; }

.viewer-controls {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  animation: fade-in 0.2s;
}

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 400px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  animation: slide-up 0.3s ease-out;
}

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

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.modal-header h3 { font-size: 1rem; font-weight: 600; }

.modal-close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.25rem;
}

.modal-body { padding: 1.25rem; }

.modal-label {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.2rem;
  display: block;
  color: var(--text);
}

.modal-hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.modal-hint a { color: var(--accent); }

.modal-input {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  font-family: var(--font);
  font-size: 0.85rem;
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
}

.modal-input:focus { border-color: var(--accent); }

.modal-divider {
  height: 1px;
  background: var(--border);
  margin: 1rem 0;
}

.modal-section { margin-bottom: 0.5rem; }

.modal-about {
  font-size: 0.75rem;
  color: var(--text-dim);
  line-height: 1.6;
}

/* ===== Error toast ===== */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  font-size: 0.85rem;
  z-index: 2000;
  animation: toast-in 0.3s ease-out;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

.toast.error { border-color: var(--danger); color: var(--danger); }

@keyframes toast-in {
  from { opacity: 0; transform: translate(-50%, 10px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* ===== Responsive ===== */
@media (max-width: 480px) {
  .photo-grid {
    grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
  }

  .viewer-wrap {
    aspect-ratio: 1;
    border-radius: 8px;
  }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }