/* ============================================================
   生万物 - 主样式
   ============================================================ */
:root {
  --bg: #0d1117;
  --bg2: #161b22;
  --bg3: #21262d;
  --border: #30363d;
  --text: #e6edf3;
  --text2: #8b949e;
  --green: #3fb950;
  --green-dark: #238636;
  --green-glow: rgba(63,185,80,.15);
  --accent: #58a6ff;
  --danger: #f85149;
  --warn: #d29922;
  --radius: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,.4);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }

/* ---- 通用 ---- */
.hidden { display: none !important; }
.mt-8 { margin-top: 8px; }
.w-full { width: 100%; }

/* ---- Auth 页面 ---- */
.auth-page { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; }
.auth-container { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 40px 36px; width: 100%; max-width: 400px; box-shadow: var(--shadow); }
.auth-logo { text-align: center; margin-bottom: 28px; }
.logo-icon { font-size: 40px; }
.auth-logo h1 { font-size: 24px; margin: 8px 0 4px; }
.auth-logo p { color: var(--text2); font-size: 14px; }
.auth-tabs { display: flex; gap: 0; margin-bottom: 24px; border-bottom: 1px solid var(--border); }
.tab-btn { flex: 1; padding: 10px; background: none; border: none; color: var(--text2); cursor: pointer; font-size: 15px; border-bottom: 2px solid transparent; margin-bottom: -1px; transition: all .2s; }
.tab-btn.active { color: var(--green); border-bottom-color: var(--green); }
.form-group { margin-bottom: 14px; }
.form-group input { width: 100%; padding: 10px 14px; background: var(--bg3); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 14px; outline: none; transition: border-color .2s; }
.form-group input:focus { border-color: var(--green); }
.register-tip { background: var(--green-glow); border: 1px solid var(--green); border-radius: 8px; padding: 10px 14px; font-size: 13px; color: var(--green); margin-bottom: 14px; text-align: center; }
.form-msg { margin-top: 10px; font-size: 13px; text-align: center; }
.form-msg.error { color: var(--danger); }
.form-msg.success { color: var(--green); }
.auth-footer { margin-top: 24px; color: var(--text2); font-size: 13px; }

/* ---- Buttons ---- */
.btn-primary { background: var(--green-dark); color: #fff; border: none; border-radius: 8px; padding: 10px 20px; cursor: pointer; font-size: 14px; font-weight: 500; transition: background .2s; }
.btn-primary:hover { background: var(--green); }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }
.btn-secondary { background: var(--bg3); color: var(--text2); border: 1px solid var(--border); border-radius: 8px; padding: 10px 16px; cursor: pointer; font-size: 14px; transition: all .2s; }
.btn-secondary:hover { color: var(--text); border-color: var(--text2); }
.btn-outline { background: transparent; color: var(--text2); border: 1px solid var(--border); border-radius: 6px; padding: 6px 12px; cursor: pointer; font-size: 13px; transition: all .2s; text-decoration: none; display: inline-block; }
.btn-outline:hover { color: var(--text); border-color: var(--text2); }
.btn-sm { padding: 5px 10px; border-radius: 6px; font-size: 12px; cursor: pointer; border: 1px solid var(--border); background: var(--bg3); color: var(--text2); transition: all .2s; text-decoration: none; }
.btn-sm:hover { color: var(--text); }
.btn-admin { background: var(--warn); color: #000; border-color: var(--warn); }

/* ---- Main Layout ---- */
.topbar { display: flex; justify-content: space-between; align-items: center; padding: 0 24px; height: 56px; background: var(--bg2); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
.topbar-left .logo-text { font-size: 18px; font-weight: 600; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.seeds-badge { background: var(--green-glow); border: 1px solid var(--green); color: var(--green); padding: 4px 10px; border-radius: 20px; font-size: 13px; }
.username { color: var(--text2); font-size: 14px; }
.main-layout { display: flex; height: calc(100vh - 56px); overflow: hidden; }

/* ---- Sidebar ---- */
.sidebar { width: 260px; min-width: 260px; background: var(--bg2); border-right: 1px solid var(--border); padding: 20px 16px; overflow-y: auto; }
.panel-section { margin-bottom: 24px; }
.panel-label { display: block; font-size: 12px; color: var(--text2); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 8px; }
.select-input { width: 100%; padding: 8px 10px; background: var(--bg3); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 13px; outline: none; cursor: pointer; }
.size-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin-bottom: 8px; }
.size-btn { padding: 6px 4px; background: var(--bg3); border: 1px solid var(--border); border-radius: 6px; color: var(--text2); font-size: 12px; cursor: pointer; transition: all .2s; }
.size-btn.active, .size-btn:hover { border-color: var(--green); color: var(--green); background: var(--green-glow); }
.size-custom { display: flex; align-items: center; gap: 8px; }
.num-input { width: 80px; padding: 8px; background: var(--bg3); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 13px; text-align: center; outline: none; }
.slider { width: 100%; accent-color: var(--green); }
.steps-val { color: var(--green); font-weight: 600; }

/* ---- Content Area ---- */
.content-area { flex: 1; overflow-y: auto; padding: 24px; display: flex; flex-direction: column; gap: 24px; }
.prompt-area { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.prompt-input { width: 100%; background: var(--bg3); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 14px; padding: 12px; resize: vertical; outline: none; font-family: inherit; line-height: 1.5; transition: border-color .2s; }
.prompt-input:focus { border-color: var(--green); }
.prompt-input.neg { margin-top: 10px; }
.prompt-actions { display: flex; gap: 12px; margin-top: 14px; }
.btn-generate { flex: 1; padding: 12px 24px; font-size: 15px; }
.gen-error { color: var(--danger); font-size: 13px; margin-top: 8px; }

/* ---- Result ---- */
.result-area { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); min-height: 300px; display: flex; align-items: center; justify-content: center; overflow: hidden; position: relative; }
.loading-box { text-align: center; padding: 40px; }
.spinner { width: 48px; height: 48px; border: 3px solid var(--border); border-top-color: var(--green); border-radius: 50%; animation: spin 1s linear infinite; margin: 0 auto 16px; }
@keyframes spin { to { transform: rotate(360deg); } }
.result-image-wrap { width: 100%; padding: 16px; text-align: center; }
.result-image { max-width: 100%; max-height: 60vh; border-radius: 8px; cursor: zoom-in; box-shadow: var(--shadow); }
.result-actions { margin-top: 12px; display: flex; gap: 10px; justify-content: center; }
.empty-state { text-align: center; padding: 60px 20px; }
.empty-icon { font-size: 48px; margin-bottom: 12px; }
.empty-state p { color: var(--text2); font-size: 15px; }

/* ---- History ---- */
.history-section { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.history-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.history-header h3 { font-size: 16px; }
.history-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; }
.history-item { border-radius: 8px; overflow: hidden; background: var(--bg3); border: 1px solid var(--border); cursor: zoom-in; transition: transform .2s, border-color .2s; }
.history-item:hover { transform: translateY(-2px); border-color: var(--green); }
.history-item img { width: 100%; aspect-ratio: 1; object-fit: cover; display: block; }
.history-item-info { padding: 8px 10px; }
.history-prompt { display: block; font-size: 11px; color: var(--text2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.history-meta { display: block; font-size: 10px; color: var(--text2); margin-top: 2px; opacity: .7; }
.empty-history { color: var(--text2); text-align: center; padding: 20px; font-size: 14px; }

/* ---- Lightbox ---- */
.lightbox { position: fixed; inset: 0; background: rgba(0,0,0,.9); display: flex; align-items: center; justify-content: center; z-index: 999; cursor: zoom-out; }
.lightbox img { max-width: 90vw; max-height: 90vh; border-radius: 8px; }
.lightbox-close { position: fixed; top: 20px; right: 24px; background: var(--bg3); border: 1px solid var(--border); color: var(--text); width: 36px; height: 36px; border-radius: 50%; cursor: pointer; font-size: 16px; display: flex; align-items: center; justify-content: center; }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .main-layout { flex-direction: column; height: auto; }
  .sidebar { width: 100%; min-width: 0; border-right: none; border-bottom: 1px solid var(--border); }
  .history-grid { grid-template-columns: repeat(2, 1fr); }
}