/* ============================================
   共享样式 — 登录 / 注册 / 画廊
   ============================================ */

:root {
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --error: #ef4444;
  --success: #22c55e;
  --info: #3b82f6;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 12px rgba(0,0,0,.04);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

/* ---- Auth Pages (Login / Register) ---- */

.auth-container {
  width: 100%;
  max-width: 400px;
}

.auth-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px 32px;
}

.auth-card h1 {
  font-size: 24px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 8px;
}

.auth-card .subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 28px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text);
}

.form-group input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  transition: border-color .2s, box-shadow .2s;
  outline: none;
}

.form-group input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,.15);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

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

.btn-secondary:hover {
  background: rgba(99,102,241,.05);
}

.auth-link {
  text-align: center;
  margin-top: 20px;
  font-size: 14px;
  color: var(--text-muted);
}

.auth-link a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

.auth-link a:hover {
  text-decoration: underline;
}

/* ---- Message ---- */

.message {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 16px;
  display: none;
}

.message.error {
  background: #fef2f2;
  color: var(--error);
  border: 1px solid #fecaca;
}

.message.success {
  background: #f0fdf4;
  color: #16a34a;
  border: 1px solid #bbf7d0;
}

.message.info {
  background: #eff6ff;
  color: var(--info);
  border: 1px solid #bfdbfe;
}

/* ---- Gallery Page ---- */

.gallery-container {
  width: 100%;
  max-width: 960px;
}

.gallery-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding: 16px 24px;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.gallery-header h1 {
  font-size: 20px;
  font-weight: 700;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
}

.user-info span {
  color: var(--text-muted);
}

.btn-logout {
  padding: 6px 16px;
  font-size: 13px;
  background: transparent;
  color: var(--error);
  border: 1px solid var(--error);
  border-radius: 6px;
  cursor: pointer;
  font-weight: 500;
  transition: background .2s;
}

.btn-logout:hover {
  background: #fef2f2;
}

/* Upload Area */

.upload-section {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 24px;
}

.upload-section h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 14px;
}

#upload-area {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
  color: var(--text-muted);
}

#upload-area:hover,
#upload-area.drag-over {
  border-color: var(--primary);
  background: rgba(99,102,241,.03);
}

#upload-area .upload-icon {
  font-size: 36px;
  margin-bottom: 8px;
}

#upload-area p {
  font-size: 14px;
}

#file-input {
  display: none;
}

/* Gallery Grid */

.gallery-grid {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

.gallery-grid h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
}

#gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.image-card {
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
  transition: box-shadow .2s, transform .2s;
}

.image-card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,.1);
  transform: translateY(-2px);
}

.image-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}

.image-info {
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.image-name {
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.image-user {
  font-size: 12px;
  color: var(--primary);
  font-weight: 500;
}

.image-time {
  font-size: 11px;
  color: var(--text-muted);
}

.loading, .empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
  font-size: 14px;
}

/* ---- Responsive ---- */

@media (max-width: 600px) {
  .auth-card {
    padding: 28px 20px;
  }
  .gallery-header {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  #gallery {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }
}