/* ============================================================
   友章 · AI 无限画布 设计系统
   设计系统 (Design System)
   ============================================================ */

:root {
  --primary: #6C5CE7;
  --primary-2: #8B5CF6;
  --indigo: #6366F1;
  --pink: #EC4899;
  --blue: #3B82F6;
  --grad: linear-gradient(135deg, #7C3AED 0%, #6366F1 50%, #EC4899 100%);
  --grad-soft: linear-gradient(135deg, #EDE9FE 0%, #E0E7FF 50%, #FCE7F3 100%);

  --bg: #F6F6FA;
  --bg-2: #FFFFFF;
  --card: #FFFFFF;
  --border: #ECECF3;
  --border-2: #E2E2EE;

  --text: #1D1D2C;
  --text-2: #4B4B5F;
  --text-3: #8A8AA0;

  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --shadow-sm: 0 2px 8px rgba(29, 29, 44, .05);
  --shadow: 0 8px 24px rgba(29, 29, 44, .08);
  --shadow-lg: 0 18px 48px rgba(108, 92, 231, .22);
  --font: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: inherit; color: inherit; }
ul { list-style: none; }

.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.9);
  backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; gap: 20px; height: 64px; }

.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-mark {
  width: 34px; height: 34px; border-radius: 10px;
  background: var(--grad);
  display: grid; place-items: center;
  color: #fff; font-weight: 800; font-size: 17px;
  box-shadow: 0 6px 16px rgba(108,92,231,.35);
}
.logo-text { font-size: 20px; font-weight: 800; letter-spacing: -.3px; }
.logo-text em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.logo-sub { font-size: 12px; color: var(--text-3); font-weight: 500; }

.search-box {
  flex: 1; max-width: 460px; position: relative;
}
.search-box input {
  width: 100%; height: 42px; padding: 0 42px 0 18px;
  border: 1px solid var(--border-2); border-radius: 999px;
  background: #F4F4F9; font-size: 14px; outline: none;
  transition: .2s;
}
.search-box input:focus { background: #fff; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(108,92,231,.12); }
.search-box .search-btn {
  position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--grad); color: #fff; display: grid; place-items: center;
  font-size: 15px;
}

.main-nav { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.main-nav a {
  padding: 8px 14px; border-radius: 999px; font-size: 14.5px; font-weight: 500;
  color: var(--text-2); transition: .18s; white-space: nowrap;
}
.main-nav a:hover { color: var(--primary); background: #F0EEFF; }
.main-nav a.active { color: var(--primary); background: #EEEBFF; font-weight: 600; }

.header-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.btn-login { font-size: 14px; color: var(--text-2); padding: 8px 4px; font-weight: 500; }
.btn-login:hover { color: var(--primary); }
.btn-primary {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--grad); color: #fff;
  padding: 9px 18px; border-radius: 999px; font-size: 14px; font-weight: 600;
  box-shadow: 0 6px 16px rgba(108,92,231,.28); transition: .2s;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 22px rgba(108,92,231,.36); }

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(800px 400px at 15% -10%, #EDE9FE 0%, transparent 60%),
    radial-gradient(700px 380px at 85% 0%, #FCE7F3 0%, transparent 55%),
    radial-gradient(600px 400px at 50% 120%, #E0E7FF 0%, transparent 55%),
    #fff;
  padding: 64px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: #fff; border: 1px solid var(--border-2);
  padding: 6px 14px; border-radius: 999px; font-size: 13px; color: var(--text-2);
  box-shadow: var(--shadow-sm); margin-bottom: 22px;
}
.hero-badge b { color: var(--primary); }
.hero h1 {
  font-size: clamp(34px, 5vw, 52px); font-weight: 800; letter-spacing: -1px; line-height: 1.2;
}
.hero h1 .grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.sub { margin-top: 16px; font-size: 17px; color: var(--text-2); }

.hero-actions { margin-top: 30px; display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }
.btn-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  background: #fff; border: 1px solid var(--border-2); color: var(--text-2);
  padding: 11px 20px; border-radius: 999px; font-size: 15px; font-weight: 600;
  transition: .2s;
}
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-primary-lg { padding: 13px 30px; font-size: 16px; border-radius: 999px; }

.hero-stats { margin-top: 40px; display: flex; justify-content: center; gap: 48px; flex-wrap: wrap; }
.stat { text-align: center; }
.stat .num { font-size: 26px; font-weight: 800; letter-spacing: -.5px; }
.stat .num span { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat .label { font-size: 13px; color: var(--text-3); margin-top: 2px; }

/* ---------- Sections ---------- */
.section { padding: 44px 0; }
.section-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.section-title { font-size: 22px; font-weight: 800; letter-spacing: -.3px; display: flex; align-items: center; gap: 10px; }
.section-title .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--grad); }
.section-more { font-size: 14px; color: var(--text-3); font-weight: 500; }
.section-more:hover { color: var(--primary); }

/* ---------- Category entry ---------- */
.cat-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.cat-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 16px; text-align: center; cursor: pointer; transition: .2s;
}
.cat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: transparent; }
.cat-icon {
  width: 52px; height: 52px; border-radius: 14px; margin: 0 auto 12px;
  display: grid; place-items: center; font-size: 24px;
}
.cat-card .name { font-size: 14.5px; font-weight: 600; }
.cat-card .desc { font-size: 12px; color: var(--text-3); margin-top: 3px; }

/* ---------- Cards (models) ---------- */
.card-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.model-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; cursor: pointer; transition: .2s;
}
.model-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: transparent; }
.model-cover { position: relative; aspect-ratio: 1 / 1; background: var(--grad-soft); overflow: hidden; }
.model-cover img, .model-cover .art { width: 100%; height: 100%; object-fit: cover; }
.model-cover .type-badge {
  position: absolute; left: 10px; top: 10px;
  background: rgba(0,0,0,.45); color: #fff; font-size: 11px; font-weight: 600;
  padding: 3px 9px; border-radius: 999px; backdrop-filter: blur(4px);
}
.model-cover .gen-btn {
  position: absolute; right: 10px; bottom: 10px;
  background: rgba(255,255,255,.95); color: var(--primary);
  font-size: 12px; font-weight: 700; padding: 6px 12px; border-radius: 999px;
  opacity: 0; transform: translateY(4px); transition: .2s;
}
.model-card:hover .gen-btn { opacity: 1; transform: translateY(0); }
.model-body { padding: 12px 14px 14px; }
.model-name { font-size: 15px; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.model-author { font-size: 12.5px; color: var(--text-3); margin-top: 2px; display: flex; align-items: center; gap: 6px; }
.model-author .avatar { width: 16px; height: 16px; border-radius: 50%; background: var(--grad); color:#fff; font-size: 9px; display:grid; place-items:center; flex-shrink:0; }
.model-meta { display: flex; align-items: center; gap: 14px; margin-top: 10px; font-size: 12.5px; color: var(--text-3); }
.model-meta span { display: inline-flex; align-items: center; gap: 4px; }
.model-meta .hot { color: #F97316; font-weight: 600; }

/* ---------- Works masonry ---------- */
.masonry { columns: 4; column-gap: 16px; }
.work-card {
  break-inside: avoid; margin-bottom: 16px; border-radius: var(--radius);
  overflow: hidden; position: relative; cursor: pointer; background: var(--grad-soft);
  border: 1px solid var(--border);
}
.work-card img, .work-card .art { width: 100%; display: block; }
.work-overlay {
  position: absolute; inset: 0; background: linear-gradient(180deg, transparent 40%, rgba(15,15,30,.82));
  opacity: 0; transition: .25s; display: flex; flex-direction: column; justify-content: flex-end;
  padding: 16px; color: #fff;
}
.work-card:hover .work-overlay { opacity: 1; }
.work-overlay .prompt { font-size: 13px; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.work-overlay .meta { display: flex; gap: 14px; margin-top: 10px; font-size: 12px; color: #ddd; align-items: center; }
.work-overlay .meta .avatar { width: 20px; height: 20px; border-radius: 50%; background: var(--grad); display: grid; place-items: center; font-size: 10px; }

/* ---------- Tabs ---------- */
.tabs { display: flex; gap: 4px; flex-wrap: wrap; }
.tab {
  padding: 8px 18px; border-radius: 999px; font-size: 14px; font-weight: 500;
  color: var(--text-2); transition: .18s;
}
.tab:hover { color: var(--primary); background: #F0EEFF; }
.tab.active { background: var(--grad); color: #fff; font-weight: 600; box-shadow: 0 6px 16px rgba(108,92,231,.28); }

/* ---------- Filter / model gallery ---------- */
.gallery-layout { display: grid; grid-template-columns: 240px 1fr; gap: 22px; align-items: start; }
.filter-panel {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; position: sticky; top: 84px;
}
.filter-group { margin-bottom: 20px; }
.filter-group:last-child { margin-bottom: 0; }
.filter-group .label { font-size: 13px; font-weight: 700; color: var(--text-2); margin-bottom: 10px; }
.filter-options { display: flex; flex-wrap: wrap; gap: 8px; }
.filter-chip {
  padding: 6px 13px; border-radius: 999px; font-size: 13px; color: var(--text-2);
  border: 1px solid var(--border-2); background: #fff; transition: .15s;
}
.filter-chip:hover { border-color: var(--primary); color: var(--primary); }
.filter-chip.active { background: #EEEBFF; border-color: var(--primary); color: var(--primary); font-weight: 600; }
.gallery-toolbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; gap: 12px; flex-wrap: wrap; }
.gallery-count { font-size: 13px; color: var(--text-3); }

/* ---------- Generate page ---------- */
.gen-layout { display: grid; grid-template-columns: 420px 1fr; gap: 22px; align-items: start; padding-top: 24px; }
.gen-panel {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px;
}
.gen-section-title { font-size: 14px; font-weight: 700; margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
.gen-section-title .step { width: 20px; height: 20px; border-radius: 50%; background: var(--grad); color: #fff; font-size: 11px; display: grid; place-items: center; }
textarea.prompt-input {
  width: 100%; min-height: 108px; resize: vertical; border: 1px solid var(--border-2);
  border-radius: var(--radius-sm); padding: 12px 14px; font-size: 14px; outline: none; transition: .2s;
  background: #FBFBFD;
}
textarea.prompt-input:focus { border-color: var(--primary); background: #fff; box-shadow: 0 0 0 3px rgba(108,92,231,.12); }
.prompt-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.tag-chip {
  font-size: 12px; color: var(--text-2); background: #F4F4F9; border: 1px solid var(--border);
  padding: 4px 10px; border-radius: 999px; cursor: pointer; transition: .15s;
}
.tag-chip:hover { color: var(--primary); border-color: var(--primary); }

.model-select { width: 100%; }
.model-select .selected {
  display: flex; align-items: center; gap: 12px; border: 1px solid var(--border-2);
  border-radius: var(--radius-sm); padding: 10px 12px; cursor: pointer; transition: .2s;
  background: #FBFBFD;
}
.model-select .selected:hover { border-color: var(--primary); }
.model-select .thumb { width: 44px; height: 44px; border-radius: 8px; flex-shrink: 0; }
.model-select .info { flex: 1; min-width: 0; }
.model-select .info .n { font-size: 14px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.model-select .info .t { font-size: 12px; color: var(--text-3); }
.model-select .caret { color: var(--text-3); font-size: 13px; }
.model-dropdown {
  margin-top: 6px; border: 1px solid var(--border-2); border-radius: var(--radius-sm);
  max-height: 260px; overflow: auto; background: #fff;
}
.model-opt { display: flex; align-items: center; gap: 10px; padding: 9px 12px; cursor: pointer; font-size: 13px; }
.model-opt:hover { background: #F5F4FF; }
.model-opt .thumb { width: 34px; height: 34px; border-radius: 6px; flex-shrink: 0; }

.lora-row { display: flex; gap: 8px; flex-wrap: wrap; }
.lora-chip {
  display: inline-flex; align-items: center; gap: 6px; font-size: 12px;
  border: 1px solid var(--border-2); border-radius: 999px; padding: 5px 11px; cursor: pointer;
  transition: .15s; background: #fff; color: var(--text-2);
}
.lora-chip.on { background: #EEEBFF; border-color: var(--primary); color: var(--primary); font-weight: 600; }

.param-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.param { }
.param label { display: flex; justify-content: space-between; font-size: 12.5px; color: var(--text-2); margin-bottom: 6px; font-weight: 500; }
.param label .val { color: var(--primary); font-weight: 700; }
.param input[type=range] { width: 100%; accent-color: var(--primary); }
.param select {
  width: 100%; height: 36px; border: 1px solid var(--border-2); border-radius: 8px;
  padding: 0 10px; font-size: 13px; background: #FBFBFD; outline: none;
}
.seed-input {
  display: flex; gap: 8px;
}
.seed-input input { flex: 1; height: 36px; border: 1px solid var(--border-2); border-radius: 8px; padding: 0 10px; font-size: 13px; background: #FBFBFD; outline: none; }
.icon-btn {
  width: 36px; height: 36px; border: 1px solid var(--border-2); border-radius: 8px;
  display: grid; place-items: center; color: var(--text-2); transition: .15s; flex-shrink: 0;
}
.icon-btn:hover { color: var(--primary); border-color: var(--primary); }

.btn-generate {
  width: 100%; height: 48px; background: var(--grad); color: #fff;
  font-size: 16px; font-weight: 700; border-radius: 12px; margin-top: 20px;
  display: flex; align-items: center; justify-content: center; gap: 10px;
  box-shadow: 0 10px 26px rgba(108,92,231,.32); transition: .2s;
}
.btn-generate:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 14px 32px rgba(108,92,231,.42); }
.btn-generate:disabled { opacity: .6; cursor: not-allowed; }

/* ---------- Canvas ---------- */
.canvas-panel {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  min-height: 640px; display: flex; flex-direction: column; overflow: hidden;
  position: sticky; top: 84px;
}
.canvas-toolbar { display: flex; align-items: center; gap: 8px; padding: 12px 16px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.canvas-toolbar .tool {
  padding: 6px 13px; border-radius: 999px; font-size: 13px; color: var(--text-2); transition: .15s;
  border: 1px solid transparent;
}
.canvas-toolbar .tool:hover { color: var(--primary); background: #F5F4FF; }
.canvas-toolbar .tool.active { background: #EEEBFF; color: var(--primary); font-weight: 600; }
.canvas-area { flex: 1; display: grid; place-items: center; padding: 24px; position: relative; background:
  linear-gradient(45deg,#F7F7FB 25%, transparent 25%, transparent 75%, #F7F7FB 75%),
  linear-gradient(45deg,#F7F7FB 25%, #FFFFFF 25%, #FFFFFF 75%, #F7F7FB 75%);
  background-size: 24px 24px; background-position: 0 0, 12px 12px;
}
.canvas-empty { text-align: center; color: var(--text-3); }
.canvas-empty .big { font-size: 60px; margin-bottom: 14px; }
.canvas-empty h3 { font-size: 17px; color: var(--text-2); margin-bottom: 6px; }
.canvas-empty p { font-size: 13.5px; }
.canvas-result { position: relative; max-width: 100%; }
.canvas-result img, .canvas-result canvas {
  max-width: 100%; max-height: 560px; border-radius: 12px; box-shadow: var(--shadow-lg);
}
.canvas-result .actions { position: absolute; right: 10px; bottom: 10px; display: flex; gap: 8px; }
.canvas-result .actions button {
  background: rgba(255,255,255,.95); color: var(--text-2); font-size: 12px; font-weight: 600;
  padding: 7px 13px; border-radius: 999px; display: flex; align-items: center; gap: 5px;
  box-shadow: var(--shadow-sm); transition: .15s;
}
.canvas-result .actions button:hover { color: var(--primary); }

/* Loading */
.gen-loading { text-align: center; padding: 30px; }
.gen-loading .spinner {
  width: 60px; height: 60px; border-radius: 50%; margin: 0 auto 20px;
  border: 4px solid #EDE9FE; border-top-color: var(--primary);
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.progress-bar { width: 240px; height: 8px; background: #EDE9FE; border-radius: 999px; margin: 0 auto; overflow: hidden; }
.progress-bar .fill { height: 100%; background: var(--grad); border-radius: 999px; transition: width .2s; }
.gen-loading .status { font-size: 13.5px; color: var(--text-2); margin-top: 14px; }
.gen-loading .step-log { margin-top: 16px; font-size: 12px; color: var(--text-3); text-align: left; max-width: 260px; margin-left: auto; margin-right: auto; }
.gen-loading .step-log div { padding: 2px 0; }

/* ---------- Footer ---------- */
.site-footer { background: #fff; border-top: 1px solid var(--border); margin-top: 40px; }
.footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr; gap: 24px; padding: 44px 0 30px; }
.footer-brand .logo-text { margin-bottom: 10px; display: inline-block; }
.footer-brand p { font-size: 13px; color: var(--text-3); max-width: 260px; }
.footer-col h4 { font-size: 14px; font-weight: 700; margin-bottom: 14px; }
.footer-col a { display: block; font-size: 13px; color: var(--text-3); padding: 4px 0; }
.footer-col a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid var(--border); padding: 18px 0; text-align: center; font-size: 12.5px; color: var(--text-3); }

/* ---------- Page hero (sub pages) ---------- */
.page-hero { background: #fff; border-bottom: 1px solid var(--border); padding: 28px 0 20px; }
.page-hero h1 { font-size: 26px; font-weight: 800; letter-spacing: -.4px; }
.page-hero p { font-size: 14px; color: var(--text-3); margin-top: 4px; }

/* ---------- Empty / skeleton ---------- */
.skeleton { background: linear-gradient(90deg,#EEEEF6 25%,#F7F7FC 37%,#EEEEF6 63%); background-size: 400% 100%; animation: sk 1.4s ease infinite; }
@keyframes sk { 0% { background-position: 100% 0; } 100% { background-position: -100% 0; } }

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: #1D1D2C; color: #fff; padding: 12px 22px; border-radius: 999px; font-size: 14px;
  opacity: 0; pointer-events: none; transition: .3s; z-index: 999; box-shadow: var(--shadow-lg);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
  .cat-grid { grid-template-columns: repeat(3, 1fr); }
  .card-grid { grid-template-columns: repeat(3, 1fr); }
  .masonry { columns: 3; }
}
@media (max-width: 900px) {
  .gen-layout { grid-template-columns: 1fr; }
  .canvas-panel { position: static; min-height: 480px; }
  .gallery-layout { grid-template-columns: 1fr; }
  .filter-panel { position: static; }
  .main-nav { display: none; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .masonry { columns: 2; }
}
@media (max-width: 560px) {
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .card-grid { grid-template-columns: 1fr; }
  .masonry { columns: 1; }
  .header-actions .btn-login { display: none; }
  .logo-sub { display: none; }
}