/* ==========================================================================
   FixImg v2 — Design System
   ========================================================================== */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --accent: #06b6d4;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --text: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --bg-soft-2: #f1f5f9;
  --border: #e2e8f0;
  --card: #ffffff;
  --shadow-sm: 0 1px 2px rgba(15,23,42,.06);
  --shadow-md: 0 4px 12px -2px rgba(15,23,42,.10);
  --shadow-lg: 0 12px 32px -8px rgba(15,23,42,.18);
  --radius: 14px;
  --radius-sm: 9px;
  --radius-lg: 22px;
  --t: .2s ease;
  --maxw: 1180px;
}
[data-lang="en"] { --maxw: 1180px; }

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, sans-serif;
  color: var(--text); background: var(--bg); line-height: 1.65; font-size: 16px;
  min-height: 100vh; display: flex; flex-direction: column;
}
#app { display: flex; flex-direction: column; min-height: 100vh; }
#main { flex: 1; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; letter-spacing: -.01em; }
h1 { font-size: clamp(1.9rem, 4.5vw, 3.1rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: 1.05rem; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; background: var(--primary); color: #fff; padding: 8px 14px; border-radius: 8px; z-index: 100; }

/* ---- Header ---- */
.header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.85); backdrop-filter: saturate(180%) blur(14px); border-bottom: 1px solid var(--border); }
.nav { display: flex; align-items: center; gap: 18px; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.15rem; }
.logo-mark { width: 34px; height: 34px; border-radius: 10px; background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; display: grid; place-items: center; font-weight: 900; box-shadow: var(--shadow-sm); }
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a { padding: 8px 14px; border-radius: 9px; color: var(--text-2); font-weight: 600; font-size: .94rem; transition: var(--t); }
.nav-links a:hover { background: var(--bg-soft-2); color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 8px; }
.lang-btn { padding: 7px 14px; border: 1px solid var(--border); background: #fff; border-radius: 9px; font-weight: 700; font-size: .85rem; color: var(--text-2); transition: var(--t); }
.lang-btn:hover { border-color: var(--primary); color: var(--primary); }
.menu-btn { display: none; background: none; border: none; color: var(--text); padding: 6px; }

/* ---- Buttons ---- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 11px 22px; border-radius: 11px; font-weight: 700; font-size: .95rem; border: 1px solid transparent; transition: var(--t); cursor: pointer; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 6px 16px -6px rgba(99,102,241,.7); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-outline { background: #fff; color: var(--text); border-color: var(--border); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-secondary { background: #fff; color: var(--primary); }
.btn-secondary:hover { background: var(--bg-soft); }
.btn-lg { padding: 14px 30px; font-size: 1.02rem; }
.btn-block { width: 100%; }
.btn:disabled { opacity: .55; cursor: not-allowed; transform: none !important; }

/* ---- Hero ---- */
.hero { background: radial-gradient(1200px 500px at 50% -10%, rgba(99,102,241,.16), transparent 60%), linear-gradient(180deg, var(--bg-soft), var(--bg)); padding: clamp(48px, 9vw, 96px) 0 clamp(40px, 7vw, 72px); text-align: center; }
.hero-inner { max-width: 820px; }
.hero h1 { margin-bottom: 18px; background: linear-gradient(120deg, var(--text), var(--primary)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { font-size: clamp(1rem, 2vw, 1.18rem); color: var(--text-2); margin-bottom: 30px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---- Sections ---- */
.section { padding: clamp(40px, 6vw, 68px) 0; }
.section-sm { padding: 30px 0; }
.bg-light { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 34px; }
.section-head p { color: var(--text-2); margin-top: 8px; }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; text-align: center; }
.stats div { display: flex; flex-direction: column; gap: 2px; }
.stats b { font-size: clamp(1.4rem, 3vw, 2rem); color: var(--primary); }
.stats span { color: var(--text-2); font-size: .9rem; }

/* ---- Grid & Cards ---- */
.grid { display: grid; gap: 18px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; transition: var(--t); }
.tool-card { display: block; }
.tool-card:hover { transform: translateY(-3px); border-color: var(--primary-light); box-shadow: var(--shadow-md); }
.tool-icon { font-size: 1.7rem; margin-bottom: 12px; line-height: 1; }
.tool-card h3 { margin-bottom: 6px; }
.tool-card p { color: var(--text-2); font-size: .9rem; }
.benefit-card { text-align: left; }

/* ---- Page ---- */
.page { padding: 32px 20px 64px; }
.page-head { text-align: center; max-width: 720px; margin: 8px auto 32px; }
.page-head p { color: var(--text-2); margin-top: 10px; }
.lead { font-size: 1.1rem; color: var(--text-2); max-width: 760px; }
.center { text-align: center; }
.breadcrumb { display: flex; gap: 8px; align-items: center; color: var(--text-3); font-size: .9rem; margin-bottom: 18px; flex-wrap: wrap; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb b { color: var(--text-2); }
.filter-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin: 20px 0 28px; }
.tab { padding: 8px 16px; border-radius: 999px; border: 1px solid var(--border); color: var(--text-2); font-weight: 600; font-size: .9rem; background: #fff; }
.tab.active, .tab:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---- Tool layout ---- */
.tool-layout { display: grid; grid-template-columns: 380px 1fr; gap: 24px; align-items: start; }
.tool-panel, .preview-panel { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 22px; box-shadow: var(--shadow-sm); }
.dropzone { border: 2px dashed var(--border); border-radius: var(--radius); padding: 42px 20px; text-align: center; cursor: pointer; transition: var(--t); background: var(--bg-soft); }
.dropzone:hover, .dropzone.active { border-color: var(--primary); background: rgba(99,102,241,.06); }
.dz-icon { font-size: 2.6rem; margin-bottom: 10px; }
.dz-title { font-weight: 700; }
.dz-hint { color: var(--text-3); font-size: .86rem; margin-top: 4px; }
.thumbs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.thumb-name { font-size: .78rem; color: var(--text-2); background: var(--bg-soft-2); padding: 4px 9px; border-radius: 999px; }
.options { display: flex; flex-direction: column; gap: 14px; }
.opt { display: flex; flex-direction: column; gap: 6px; font-size: .9rem; font-weight: 600; color: var(--text-2); }
.opt.row { flex-direction: row; align-items: center; justify-content: space-between; }
.opt.check { flex-direction: row; align-items: center; gap: 8px; }
.opt input[type=range] { width: 100%; accent-color: var(--primary); }
.opt input[type=number], .opt input[type=text], .opt select { padding: 9px 11px; border: 1px solid var(--border); border-radius: 9px; font: inherit; width: 100%; background: #fff; }
.opt input[type=color] { width: 46px; height: 34px; border: 1px solid var(--border); border-radius: 8px; padding: 2px; background: #fff; }
.actions { display: flex; flex-direction: column; gap: 10px; margin-top: 18px; }
.progress { margin-top: 14px; text-align: center; color: var(--text-2); font-size: .9rem; }
.progress .bar { height: 5px; border-radius: 999px; background: linear-gradient(90deg, var(--primary), var(--accent)); animation: pulse 1.1s ease-in-out infinite; margin-bottom: 8px; }
@keyframes pulse { 0%,100% { opacity: .4; } 50% { opacity: 1; } }

.preview-stage { min-height: 260px; display: grid; place-items: center; background: var(--bg-soft); border-radius: var(--radius); overflow: hidden; }
.preview-stage img { max-height: 62vh; border-radius: var(--radius-sm); }
.edit-canvas { max-width: 100%; border-radius: var(--radius-sm); cursor: crosshair; touch-action: none; }
.result-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; font-size: .88rem; color: var(--text-2); }
.result-meta span { background: var(--bg-soft-2); padding: 5px 11px; border-radius: 999px; }
.result-meta .ok { background: rgba(16,185,129,.12); color: var(--success); }
.result-actions { margin-top: 14px; }
.color-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(90px, 1fr)); gap: 10px; width: 100%; }
.color-chip { border: 1px solid var(--border); border-radius: var(--radius-sm); height: 84px; display: flex; align-items: flex-end; justify-content: center; color: #fff; text-shadow: 0 1px 3px rgba(0,0,0,.6); font-weight: 700; font-size: .78rem; }
.info-table { width: 100%; border-collapse: collapse; font-size: .92rem; }
.info-table th { text-align: left; color: var(--text-3); font-weight: 600; padding: 8px 10px; border-bottom: 1px solid var(--border); width: 40%; }
.info-table td { padding: 8px 10px; border-bottom: 1px solid var(--border); word-break: break-all; }

/* ---- Article / FAQ ---- */
.article { max-width: 820px; margin: 44px auto 0; }
.article h2 { margin: 26px 0 12px; }
.article ol { padding-left: 22px; display: grid; gap: 8px; color: var(--text-2); }
.faq-list { display: grid; gap: 12px; max-width: 820px; }
.page .faq-list { margin-top: 18px; }
.faq-item { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 4px 20px; }
.faq-item summary { cursor: pointer; font-weight: 700; padding: 16px 0; list-style: none; position: relative; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; position: absolute; right: 0; top: 14px; color: var(--primary); font-size: 1.3rem; font-weight: 400; }
.faq-item[open] summary::after { content: '−'; }
.faq-item p { padding-bottom: 18px; color: var(--text-2); }

/* ---- Related ---- */
.related { margin-top: 52px; }
.related h2 { margin-bottom: 20px; }

/* ---- CTA ---- */
.cta-band { background: linear-gradient(120deg, var(--primary), var(--primary-dark)); color: #fff; text-align: center; }
.cta-band h2 { margin-bottom: 10px; }
.cta-band p { color: rgba(255,255,255,.92); max-width: 560px; margin: 0 auto 24px; }
.cta-band .btn-secondary { color: var(--primary); }

/* ---- Footer ---- */
.footer { background: var(--text); color: #cbd5e1; padding: 52px 0 24px; margin-top: auto; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 30px; }
.footer h4 { color: #fff; font-size: .95rem; margin-bottom: 14px; }
.footer ul { list-style: none; display: grid; gap: 9px; }
.footer a { color: #cbd5e1; font-size: .9rem; transition: var(--t); }
.footer a:hover { color: #fff; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.15rem; color: #fff; margin-bottom: 12px; }
.footer-desc { font-size: .9rem; max-width: 320px; }
.footer-bottom { display: flex; justify-content: space-between; gap: 12px; border-top: 1px solid rgba(255,255,255,.12); margin-top: 40px; padding-top: 20px; font-size: .85rem; flex-wrap: wrap; }

/* ---- Toast ---- */
.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px); background: var(--text); color: #fff; padding: 12px 22px; border-radius: 11px; box-shadow: var(--shadow-lg); opacity: 0; pointer-events: none; transition: var(--t); z-index: 200; font-size: .92rem; max-width: 90vw; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast[data-type="error"] { background: var(--error); }
.toast[data-type="ok"] { background: var(--success); }

/* ---- Responsive ---- */
@media (max-width: 960px) {
  .tool-layout { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .nav-links { position: fixed; inset: 64px 0 auto 0; flex-direction: column; background: #fff; border-bottom: 1px solid var(--border); padding: 12px; gap: 4px; transform: translateY(-140%); transition: var(--t); }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 12px 16px; }
  .menu-btn { display: block; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .grid-4, .grid-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
}