/* ============================================================
   SongSpark — AI Lyrics & Melody Inspiration Studio
   Design system: warm paper + coral brand, teal melody accent
   ============================================================ */
:root{
  --bg:#FBFAF6; --surface:#FFFFFF; --ink:#23262F; --ink-soft:#5C6270; --ink-faint:#8A90A0;
  --brand:#FF6B4A; --brand-deep:#E84E2C; --brand-soft:#FFF0EA;
  --amber:#F5A623; --teal:#12A48F; --teal-soft:#E6F6F2;
  --line:#EAE6DD; --line-soft:#F1EEE7;
  --dark:#1D1B26; --dark-2:#26232F;
  --shadow-sm:0 2px 10px rgba(35,32,45,.06);
  --shadow-md:0 10px 30px rgba(35,32,45,.10);
  --shadow-lg:0 20px 50px rgba(35,32,45,.16);
  --r-sm:10px; --r-md:16px; --r-lg:22px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --serif:Georgia,"Times New Roman","Songti SC","SimSun",serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--ink);line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
::selection{background:#FFD9CC;color:#7A2E14}
.container{max-width:1180px;margin:0 auto;padding:0 20px}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:60;background:rgba(251,250,246,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:18px;height:64px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:19px;letter-spacing:.2px;color:var(--ink)}
.logo svg{width:26px;height:26px;flex:none}
.logo .zh{font-size:11px;font-weight:600;color:var(--ink-faint);letter-spacing:.5px;margin-top:3px}
.main-nav{display:flex;gap:4px;margin-left:auto}
.main-nav a{padding:8px 13px;border-radius:9px;font-size:14.5px;font-weight:600;color:var(--ink-soft);transition:.18s}
.main-nav a:hover{background:var(--line-soft);color:var(--ink)}
.header-actions{display:flex;align-items:center;gap:8px;margin-left:4px}
.fav-link{display:flex;align-items:center;gap:5px;padding:7px 11px;border-radius:9px;background:var(--surface);border:1px solid var(--line);font-size:13px;font-weight:700;color:var(--ink-soft);transition:.18s}
.fav-link:hover{color:var(--brand);border-color:#FFD3C4}
.fav-link .cnt{min-width:16px;text-align:center;background:var(--brand-soft);color:var(--brand-deep);border-radius:20px;padding:0 5px;font-size:11.5px}
.lang-btn{display:flex;align-items:center;gap:6px;padding:7px 13px;border-radius:9px;border:1px solid var(--line);background:var(--surface);font-size:13.5px;font-weight:700;color:var(--ink)}
.lang-btn:hover{border-color:var(--brand);color:var(--brand-deep)}
.lang-btn svg{width:15px;height:15px}
.nav-toggle{display:none;width:40px;height:40px;border:1px solid var(--line);background:var(--surface);border-radius:9px;align-items:center;justify-content:center}
.nav-toggle svg{width:20px;height:20px}
@media(max-width:920px){
  .main-nav{position:fixed;top:64px;left:0;right:0;background:var(--surface);flex-direction:column;padding:10px 18px 16px;gap:2px;border-bottom:1px solid var(--line);box-shadow:var(--shadow-md);display:none}
  .main-nav.open{display:flex}
  .main-nav a{padding:11px 12px;font-size:15.5px}
  .nav-toggle{display:flex}
  .fav-link .lbl{display:none}
}

/* ---------- Footer ---------- */
.site-footer{background:var(--dark);color:#C9C6D4;margin-top:70px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px;padding:52px 20px 38px}
.footer-grid h4{color:#FFF;font-size:14px;letter-spacing:.4px;margin-bottom:14px}
.footer-grid a{display:block;padding:5px 0;font-size:13.8px;color:#B9B5C6;transition:.15s}
.footer-grid a:hover{color:#FF9A7E}
.footer-brand p{font-size:14px;color:#A7A3B6;margin:12px 0 16px;max-width:320px}
.footer-brand .logo{color:#FFF;margin-bottom:6px}
.footer-mail{display:inline-flex;align-items:center;gap:8px;background:#2B2836;border:1px solid #3D3947;padding:10px 16px;border-radius:10px;color:#FFF;font-size:13.5px;font-weight:600}
.footer-mail:hover{border-color:var(--brand)}
.footer-bottom{border-top:1px solid #34303F;padding:18px 20px;font-size:12.5px;color:#8F8B9E;display:flex;flex-wrap:wrap;gap:8px;justify-content:space-between}
.footer-bottom a{color:#B9B5C6;text-decoration:underline}
@media(max-width:820px){.footer-grid{grid-template-columns:1fr 1fr;gap:28px}}

/* ---------- Buttons / chips ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:12px;font-size:15px;font-weight:700;border:0;transition:.18s;white-space:nowrap}
.btn svg{width:17px;height:17px}
.btn-brand{background:var(--brand);color:#FFF;box-shadow:0 6px 18px rgba(255,107,74,.32)}
.btn-brand:hover{background:var(--brand-deep);transform:translateY(-1px)}
.btn-dark{background:var(--dark);color:#FFF}
.btn-dark:hover{background:#000}
.btn-ghost{background:var(--surface);border:1.5px solid var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand-deep)}
.btn-teal{background:var(--teal);color:#FFF;box-shadow:0 6px 18px rgba(18,164,143,.30)}
.btn-teal:hover{background:#0E8F7D;transform:translateY(-1px)}
.btn-sm{padding:8px 14px;font-size:13.5px;border-radius:9px}
.btn-block{width:100%}
.chip{display:inline-flex;align-items:center;gap:6px;padding:8px 15px;border-radius:30px;border:1.5px solid var(--line);background:var(--surface);font-size:13.5px;font-weight:600;color:var(--ink-soft);transition:.15s;cursor:pointer}
.chip:hover{border-color:#FFC9B8;color:var(--brand-deep)}
.chip.active{background:var(--brand);border-color:var(--brand);color:#FFF;box-shadow:0 4px 12px rgba(255,107,74,.28)}
.chip-teal.active{background:var(--teal);border-color:var(--teal);box-shadow:0 4px 12px rgba(18,164,143,.28)}
.chip-amber.active{background:var(--amber);border-color:var(--amber);box-shadow:0 4px 12px rgba(245,166,35,.28)}
.chip-row{display:flex;flex-wrap:wrap;gap:9px;margin:12px 0}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:520px;display:flex;align-items:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center 60%}
.hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(115deg,rgba(20,16,14,.82) 0%,rgba(20,16,14,.55) 45%,rgba(20,16,14,.30) 100%)}
.hero-inner{position:relative;z-index:2;padding:78px 20px;max-width:1180px;margin:0 auto;width:100%}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);color:#FFD9CC;padding:7px 14px;border-radius:30px;font-size:13px;font-weight:600;margin-bottom:20px}
.hero h1{color:#FFF;font-size:clamp(32px,5.2vw,56px);line-height:1.14;font-weight:800;max-width:760px;letter-spacing:-.5px}
.hero h1 em{font-style:normal;color:#FF9A7E;background:linear-gradient(90deg,#FFB59E,#FF7A59);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero p.lead{color:#E7E2DE;font-size:17.5px;max-width:620px;margin:18px 0 30px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.hero-stats{display:flex;gap:28px;margin-top:38px;flex-wrap:wrap}
.hero-stats .stat b{color:#FFF;font-size:22px;display:block;line-height:1.2}
.hero-stats .stat span{color:#C9C2BB;font-size:12.5px}
@media(max-width:640px){.hero{min-height:470px}.hero-inner{padding:56px 20px}}

/* ---------- Sections ---------- */
.section{padding:64px 0 6px}
.section-head{margin-bottom:30px}
.section-head .kicker{color:var(--brand-deep);font-size:13px;font-weight:800;letter-spacing:1.6px;text-transform:uppercase}
.section-head h2{font-size:clamp(24px,3.2vw,34px);font-weight:800;letter-spacing:-.4px;margin-top:6px}
.section-head p{color:var(--ink-soft);max-width:640px;margin-top:8px;font-size:15.5px}

/* ---------- Cards ---------- */
.tool-card{position:relative;border-radius:var(--r-md);overflow:hidden;display:flex;align-items:flex-end;min-height:225px;box-shadow:var(--shadow-sm);transition:transform .22s,box-shadow .22s;border:0}
.tool-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.tool-card .bg{position:absolute;inset:0;background-size:cover;background-position:center}
.tool-card .bg::after{content:"";position:absolute;inset:0;background:linear-gradient(8deg,rgba(15,12,18,.88) 6%,rgba(15,12,18,.38) 55%,rgba(15,12,18,.08) 100%)}
.tool-card .body{position:relative;z-index:2;padding:18px 18px 15px;width:100%}
.tool-card .cat{font-size:11px;font-weight:800;letter-spacing:1.2px;text-transform:uppercase;color:#FFB59E;margin-bottom:6px}
.tool-card h3{color:#FFF;font-size:19px;font-weight:800;line-height:1.25}
.tool-card .zh-name{color:#D8D2CB;font-size:12.5px;margin-top:2px}
.tool-card p{color:#D8D2CB;font-size:13.5px;margin-top:7px;line-height:1.5;max-height:0;overflow:hidden;opacity:0;transition:.25s}
.tool-card:hover p{max-height:70px;opacity:1}
.tool-card .foot{display:flex;justify-content:space-between;align-items:center;margin-top:11px}
.tool-card .go{color:#FFF;font-size:13px;font-weight:700;display:inline-flex;align-items:center;gap:5px}
.tool-card .go svg{width:14px;height:14px;transition:.2s}
.tool-card:hover .go svg{transform:translateX(3px)}
.fav-btn{position:absolute;top:12px;right:12px;z-index:3;width:34px;height:34px;border-radius:50%;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.3);color:#FFF;display:flex;align-items:center;justify-content:center;backdrop-filter:blur(4px);transition:.18s}
.fav-btn svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:2}
.fav-btn.on{background:var(--brand);border-color:var(--brand)}
.fav-btn.on svg{fill:#FFF}
.tool-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.tool-grid.g2{grid-template-columns:repeat(2,1fr);gap:20px}
@media(max-width:1060px){.tool-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:820px){.tool-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.tool-grid{grid-template-columns:1fr}.tool-grid.g2{grid-template-columns:1fr}.tool-card{min-height:200px}}

/* guide card */
.guide-card{position:relative;border-radius:var(--r-md);overflow:hidden;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow-sm);transition:transform .22s,box-shadow .22s;display:flex;flex-direction:column}
.guide-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.guide-card .thumb{height:150px;background-size:cover;background-position:center;position:relative}
.guide-card .thumb::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,12,18,0) 55%,rgba(15,12,18,.25))}
.guide-card .tag{position:absolute;top:10px;left:10px;z-index:2;background:rgba(15,12,18,.66);color:#FFF;font-size:11px;font-weight:700;letter-spacing:.6px;padding:4px 10px;border-radius:20px;backdrop-filter:blur(3px)}
.guide-card .g-body{padding:15px 16px 14px;flex:1;display:flex;flex-direction:column}
.guide-card h3{font-size:16.5px;font-weight:800;line-height:1.35;margin-bottom:7px}
.guide-card h3 a:hover{color:var(--brand-deep)}
.guide-card p{font-size:13.5px;color:var(--ink-soft);line-height:1.55;flex:1}
.guide-card .meta{display:flex;gap:10px;align-items:center;font-size:12px;color:var(--ink-faint);margin-top:11px}
.guide-card .meta .dot{width:3px;height:3px;border-radius:50%;background:var(--ink-faint)}
.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:900px){.guide-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.guide-grid{grid-template-columns:1fr}}
.guide-grid .card-cta{grid-column:1/-1;display:flex;align-items:center;justify-content:center;gap:10px;background:linear-gradient(120deg,var(--brand-soft),#FDEBDD);border:1.5px dashed #FFC9B8;border-radius:var(--r-md);min-height:76px;font-weight:800;color:var(--brand-deep);font-size:15.5px}
.guide-grid .card-cta:hover{background:#FFE4D6}

/* ---------- Steps ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;counter-reset:step}
.step{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);padding:26px 24px;position:relative;box-shadow:var(--shadow-sm)}
.step .num{width:42px;height:42px;border-radius:12px;background:var(--brand-soft);color:var(--brand-deep);font-weight:800;font-size:18px;display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.step.teal .num{background:var(--teal-soft);color:var(--teal)}
.step h3{font-size:17px;font-weight:800;margin-bottom:7px}
.step p{font-size:14px;color:var(--ink-soft)}
@media(max-width:820px){.steps{grid-template-columns:1fr}}

/* ---------- Tool pages ---------- */
.tool-hero{background:linear-gradient(135deg,#FFF4EE 0%,#FBFAF6 55%,#F2FAF8 100%);border-bottom:1px solid var(--line);padding:44px 0 40px}
.breadcrumb{font-size:12.5px;color:var(--ink-faint);margin-bottom:14px;display:flex;gap:7px;flex-wrap:wrap}
.breadcrumb a:hover{color:var(--brand-deep)}
.tool-hero h1{font-size:clamp(27px,3.6vw,40px);font-weight:800;letter-spacing:-.4px;line-height:1.2}
.tool-hero .sub{color:var(--ink-soft);font-size:15.5px;max-width:720px;margin-top:10px}
.tool-hero .zh-sub{color:var(--ink-faint);font-size:13.5px;margin-top:4px}
.tool-hero .hero-actions{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap}
.tool-body{padding:38px 0 10px}
.tool-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:26px;box-shadow:var(--shadow-sm);margin-bottom:26px}
.tool-panel h2{font-size:17.5px;font-weight:800;margin-bottom:4px}
.tool-panel .hint{font-size:13px;color:var(--ink-faint);margin-bottom:16px}
.control-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:18px;margin-bottom:16px}
.field label{font-size:13px;font-weight:700;color:var(--ink-soft);display:block;margin-bottom:7px}
.field select,.field input[type=text],.field textarea{width:100%;padding:10px 13px;border-radius:10px;border:1.5px solid var(--line);background:var(--surface);font-size:14.5px;font-family:inherit;color:var(--ink);transition:.15s;outline:none}
.field select:focus,.field input:focus,.field textarea:focus{border-color:var(--brand)}
.field textarea{min-height:96px;resize:vertical;line-height:1.5}
input[type=range]{width:100%;accent-color:var(--brand);height:5px;cursor:pointer}
.range-label{display:flex;justify-content:space-between;font-size:12.5px;color:var(--ink-faint);margin-top:4px}
input[type=number]{padding:9px 12px;border-radius:10px;border:1.5px solid var(--line);font-size:14px;width:92px;font-family:inherit}
.slider-val{font-weight:800;color:var(--brand-deep);font-size:15px}

/* output */
.out-card{background:#14121A;border-radius:var(--r-lg);color:#EDE9F3;padding:28px;position:relative;overflow:hidden}
.out-card .out-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;gap:10px;flex-wrap:wrap}
.out-card .out-head .title{font-size:13px;font-weight:800;letter-spacing:1px;color:#9D97B3;text-transform:uppercase}
.out-actions{display:flex;gap:8px;flex-wrap:wrap}
.out-actions .mini{background:#2B2736;border:1px solid #3D3949;color:#E7E3F0;padding:7px 13px;border-radius:9px;font-size:12.5px;font-weight:700;display:inline-flex;align-items:center;gap:6px;transition:.15s}
.out-actions .mini:hover{border-color:var(--brand);color:#FFB59E}
.out-actions .mini svg{width:14px;height:14px}
.lyrics{font-family:var(--serif);font-size:17px;line-height:1.9;white-space:pre-wrap;letter-spacing:.2px}
.lyrics .sec{margin-bottom:16px}
.lyrics .sec-title{font-size:11.5px;font-weight:800;letter-spacing:2px;color:#8F88A6;text-transform:uppercase;margin-bottom:6px}
.rpair{color:#FFD08A;font-weight:600}
.rpair2{color:#8FE3D4;font-weight:600}
.syl{color:#6E6884;font-size:13px}
.stanza-note{font-size:12.5px;color:#6E6884;margin-top:2px}
.empty-state{text-align:center;padding:44px 20px;color:var(--ink-faint)}
.empty-state svg{width:44px;height:44px;margin:0 auto 12px;color:#C9C4D8}

/* melody piano roll */
.roll-wrap{overflow-x:auto;padding-bottom:6px}
.roll{display:grid;grid-template-columns:56px repeat(var(--steps,32),1fr);gap:1px;min-width:640px}
.roll .r-label{background:#221E2C;color:#8F88A6;font-size:10px;display:flex;align-items:center;padding:0 6px;border-radius:4px 0 0 4px;height:22px}
.roll .r-note{background:#2B2736;height:22px;border-radius:4px;display:flex;align-items:center;justify-content:center;font-size:9.5px;color:#C9C4D8}
.roll .r-note.on{background:linear-gradient(135deg,#2EC4B2,#12A48F);color:#FFF;font-weight:800;box-shadow:0 0 8px rgba(46,196,178,.5)}
.roll .r-note.play{outline:2px solid #FFD08A;outline-offset:-1px}
.melody-info{display:flex;gap:18px;flex-wrap:wrap;margin-top:14px;font-size:13px;color:#B9B5C6}
.melody-info b{color:#FFF}

/* chord / key styles */
.keyboard{display:flex;justify-content:center;gap:2px;margin:14px 0;flex-wrap:wrap}
.keykey{width:46px;height:64px;border-radius:7px;background:#FFF;border:1px solid var(--line);box-shadow:0 2px 0 var(--line);display:flex;align-items:flex-end;justify-content:center;padding-bottom:6px;font-size:11.5px;font-weight:700;color:var(--ink-soft);transition:.15s;cursor:pointer}
.keykey:hover{border-color:var(--teal);color:var(--teal)}
.keykey.playing{background:var(--teal);color:#FFF;border-color:var(--teal);transform:scale(.96)}
.table{width:100%;border-collapse:collapse;table-layout:fixed;font-size:13.8px}
.table th,.table td{padding:9px 10px;border-bottom:1px solid var(--line-soft);text-align:left;vertical-align:top;word-break:break-word}
.table th{font-size:12px;letter-spacing:.6px;text-transform:uppercase;color:var(--ink-faint);background:#FAF9F4}
.table tr:hover td{background:#FDF6F1}

/* highlight + word banks */
.wordbank{display:flex;flex-wrap:wrap;gap:7px;margin-top:10px}
.wordbank .w{padding:6px 12px;background:var(--teal-soft);color:#0B7A6C;border-radius:20px;font-size:13px;font-weight:600;cursor:pointer;border:1px solid #C9EDE6;transition:.15s}
.wordbank .w:hover{background:var(--teal);color:#FFF}
.alert-tip{background:#FFF8EC;border:1px solid #F5E3BE;color:#8A6512;border-radius:12px;padding:13px 16px;font-size:13.8px;margin:14px 0}
.alert-tip b{color:#6B4E0B}

/* ---------- Guide article ---------- */
.article-hero{position:relative;min-height:300px;display:flex;align-items:flex-end;overflow:hidden;border-radius:0}
.article-hero .bg{position:absolute;inset:0;background-size:cover;background-position:center 55%}
.article-hero .bg::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,12,18,.25),rgba(15,12,18,.82))}
.article-hero .inner{position:relative;z-index:2;padding:70px 20px 34px;max-width:1180px;margin:0 auto;width:100%}
.article-hero .tag{display:inline-block;background:var(--brand);color:#FFF;font-size:11.5px;font-weight:800;letter-spacing:1px;padding:5px 12px;border-radius:20px;margin-bottom:12px;text-transform:uppercase}
.article-hero h1{color:#FFF;font-size:clamp(26px,4vw,42px);line-height:1.18;font-weight:800;max-width:820px;letter-spacing:-.4px}
.article-hero .meta{color:#D9D3CC;font-size:13.5px;margin-top:14px;display:flex;gap:12px;flex-wrap:wrap}
.article{max-width:800px;margin:0 auto;padding:44px 20px 20px}
.article .zh-summary{background:#FFF8EC;border:1px solid #F5E3BE;border-radius:var(--r-md);padding:16px 18px;margin-bottom:30px;font-size:14px;color:#6B5B35}
.article .zh-summary b{color:#8A6512;display:block;margin-bottom:6px}
.article h2{font-size:23px;font-weight:800;margin:36px 0 12px;letter-spacing:-.2px}
.article h3{font-size:18px;font-weight:800;margin:26px 0 10px}
.article p{font-size:16px;line-height:1.8;color:#3E4149;margin:13px 0}
.article ul,.article ol{margin:14px 0 14px 24px;font-size:15.5px;line-height:1.75;color:#3E4149}
.article li{margin:7px 0}
.article blockquote{border-left:4px solid var(--brand);background:var(--brand-soft);padding:13px 18px;border-radius:0 12px 12px 0;margin:18px 0;font-style:italic;color:#6E4A38}
.article .tip{background:var(--teal-soft);border:1px solid #C9EDE6;border-radius:12px;padding:14px 18px;margin:18px 0;font-size:14.5px}
.article .tip b{color:#0B7A6C}
.article .ex-line{font-family:var(--serif);font-style:italic;color:var(--brand-deep);font-size:15.5px}
.article table{width:100%;border-collapse:collapse;font-size:14.5px;margin:18px 0;table-layout:fixed}
.article table th,.article table td{padding:9px 11px;border:1px solid var(--line);text-align:left}
.article table th{background:#FAF9F4;font-size:13px;text-transform:uppercase;letter-spacing:.4px;color:var(--ink-faint)}
.article a{color:var(--brand-deep);text-decoration:underline}
.related-inline{margin-top:44px;border-top:1px solid var(--line);padding-top:30px}
.related-inline h3{font-size:18px;font-weight:800;margin-bottom:18px}

/* ---------- Misc ---------- */
.pill-tag{display:inline-flex;align-items:center;gap:5px;background:var(--teal-soft);color:#0B7A6C;border-radius:20px;padding:4px 11px;font-size:12px;font-weight:700}
.page-hero{background:linear-gradient(135deg,#FFF4EE,#FBFAF6);border-bottom:1px solid var(--line);padding:46px 0}
.page-hero h1{font-size:clamp(26px,3.6vw,38px);font-weight:800;letter-spacing:-.4px}
.page-hero p{color:var(--ink-soft);font-size:15.5px;margin-top:10px;max-width:720px}
.prose{max-width:800px;margin:0 auto;padding:36px 20px 10px;font-size:15.5px;line-height:1.8;color:#3E4149}
.prose h2{font-size:21px;font-weight:800;margin:30px 0 10px;color:var(--ink)}
.prose h3{font-size:17px;font-weight:800;margin:22px 0 8px;color:var(--ink)}
.prose p{margin:12px 0}
.prose ul,.prose ol{margin:12px 0 12px 22px}
.prose li{margin:6px 0}
.prose a{color:var(--brand-deep);text-decoration:underline}
.contact-hero{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start}
.contact-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:28px;box-shadow:var(--shadow-sm)}
.contact-card h2{font-size:18px;font-weight:800;margin-bottom:10px}
.contact-card p{font-size:14.5px;color:var(--ink-soft);margin-bottom:14px}
@media(max-width:760px){.contact-hero{grid-template-columns:1fr}}
.faq-item{border:1px solid var(--line);border-radius:var(--r-md);background:var(--surface);margin-bottom:12px;overflow:hidden}
.faq-item summary{padding:16px 20px;font-weight:700;font-size:15px;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq-item summary::after{content:"+";font-size:20px;color:var(--brand);transition:.2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item .faq-a{padding:0 20px 18px;font-size:14.5px;color:var(--ink-soft);line-height:1.7}
.cta-band{background:linear-gradient(120deg,#FF6B4A,#F5A623);border-radius:var(--r-lg);padding:44px 40px;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;color:#FFF;margin:56px 0 0;box-shadow:var(--shadow-md)}
.cta-band h2{font-size:clamp(22px,3vw,30px);font-weight:800;line-height:1.25}
.cta-band p{opacity:.92;margin-top:6px;font-size:14.5px;max-width:520px}
.cta-band .btn{background:#1D1B26;color:#FFF}
.cta-band .btn:hover{background:#000}
.filter-bar{display:flex;flex-wrap:wrap;gap:9px;align-items:center;margin-bottom:22px}
.search-box{position:relative;flex:1;min-width:220px}
.search-box input{width:100%;padding:10px 14px 10px 38px;border-radius:10px;border:1.5px solid var(--line);font-size:14px;font-family:inherit;outline:none;background:var(--surface)}
.search-box input:focus{border-color:var(--brand)}
.search-box svg{position:absolute;left:12px;top:50%;transform:translateY(-50%);width:16px;height:16px;color:var(--ink-faint)}
/* toast & cookie */
#toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%) translateY(20px);background:#1D1B26;color:#FFF;padding:11px 20px;border-radius:30px;font-size:13.5px;font-weight:600;opacity:0;pointer-events:none;transition:.25s;z-index:99;box-shadow:var(--shadow-lg)}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
#cookieBar{position:fixed;bottom:0;left:0;right:0;z-index:80;background:var(--dark);color:#D9D5E2;padding:14px 20px;display:none;align-items:center;gap:16px;justify-content:space-between;flex-wrap:wrap;box-shadow:0 -6px 24px rgba(0,0,0,.2)}
#cookieBar.show{display:flex}
#cookieBar p{font-size:13px;max-width:720px}
#cookieBar a{color:#FFB59E;text-decoration:underline}
#cookieBar button{background:var(--brand);color:#FFF;border:0;padding:9px 20px;border-radius:9px;font-weight:700;font-size:13px}
.fav-empty{text-align:center;padding:60px 20px}
.fav-empty svg{width:56px;height:56px;color:#D9D4C8;margin:0 auto 14px}
.fav-empty h2{font-size:22px;font-weight:800;margin-bottom:8px}
.fav-empty p{color:var(--ink-soft);margin-bottom:20px}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:16px}
@media(max-width:820px){.related-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.related-grid{grid-template-columns:1fr}}
.ad-note{background:#F4F2EC;border:1px dashed #D8D3C4;color:#8A8792;font-size:12px;text-align:center;padding:8px;border-radius:10px;margin:30px auto 0;max-width:760px}
.skip-link{position:absolute;left:-999px;top:0;background:var(--ink);color:#FFF;padding:8px 16px;z-index:100}
.skip-link:focus{left:8px;top:8px}
footer{scroll-margin-top:80px}
@media print{.site-header,.site-footer,#cookieBar,#toast,.hero-actions{display:none}}

/* ===== Premium: beta banner + badges ===== */
.beta-banner{background:linear-gradient(90deg,#E84E2C,#FF6B4A);color:#FFF;font-size:12.5px;line-height:1.5;padding:7px 0}
.beta-banner .container{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.beta-banner svg{flex:none}
.beta-banner a.banner-cta{color:#FFF;font-weight:700;text-decoration:underline;white-space:nowrap}
.beta-banner .banner-x{margin-left:auto;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.55);color:#FFF;border-radius:999px;padding:2px 12px;font-size:12px;cursor:pointer;white-space:nowrap}
.beta-banner .banner-x:hover{background:rgba(255,255,255,.32)}
.pro-badge{display:inline-flex;align-items:center;gap:5px;background:linear-gradient(90deg,#E84E2C,#FF8A3C);color:#FFF;font-size:11.5px;font-weight:700;padding:3px 10px;border-radius:999px}
.pro-badge em{font-style:normal;font-weight:500;opacity:.85}
.premium-hero-flag{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.4);color:#FFF;font-size:12px;font-weight:600;padding:5px 12px;border-radius:999px;backdrop-filter:blur(4px)}
.premium-unlocked-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:14px 0 4px}
.premium-unlocked-row .dot{width:9px;height:9px;border-radius:50%;background:#2ECC71;box-shadow:0 0 0 3px rgba(46,204,113,.18)}
.premium-price-free{font-size:34px;font-weight:900;color:var(--teal)}
.premium-price-slot{font-size:34px;font-weight:900;color:var(--ink-soft)}
.benefit-card{position:relative;border-radius:var(--r-lg);overflow:hidden;min-height:210px;display:flex;flex-direction:column;justify-content:flex-end;padding:20px;color:#FFF;background-size:cover;background-position:center}
.benefit-card::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(20,18,26,0) 30%,rgba(20,18,26,.86) 100%)}
.benefit-card>*{position:relative;z-index:1}
.benefit-card .bc-tag{font-size:11px;letter-spacing:.08em;text-transform:uppercase;opacity:.85;margin-bottom:4px}
.benefit-card h3{font-size:19px;margin:0 0 6px}
.benefit-card p{font-size:13px;line-height:1.55;opacity:.94;margin:0}
.benefit-card .bc-state{margin-top:10px;align-self:flex-start}
.benefit-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:26px}
@media(max-width:1060px){.benefit-grid{grid-template-columns:repeat(2,1fr)}}

/* ===== bilingual visibility =====
   默认英文：隐藏中文变体；<html lang="zh"> 时隐藏英文变体、显示中文变体。 */
.only-zh{display:none}
html[lang="zh"] .only-en{display:none!important}
html[lang="zh"] .only-zh{display:revert}
@media(max-width:640px){.benefit-grid{grid-template-columns:1fr}}
.beta-strip{display:flex;align-items:center;gap:10px;background:linear-gradient(90deg,#E84E2C,#FF6B4A);color:#FFF;border-radius:16px;padding:14px 18px;font-size:14px;margin:22px 0 0}
.beta-strip b{white-space:nowrap}
.beta-strip a{margin-left:auto;color:#FFF;font-weight:700;text-decoration:underline;white-space:nowrap}
@media(max-width:640px){.beta-strip{flex-wrap:wrap}.beta-strip a{margin-left:0}}

/* ===== Photo banner heroes (tool pages + sub pages) ===== */
.tool-hero.photo,.page-hero.photo{position:relative;overflow:hidden;background-size:cover;background-position:center 42%;color:#FFF;border-bottom:none;padding:66px 0 58px}
.tool-hero.photo::before,.page-hero.photo::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(24,20,30,.42),rgba(24,20,30,.82))}
.tool-hero.photo .container,.page-hero.photo .container{position:relative;z-index:1}
.tool-hero.photo h1,.page-hero.photo h1{color:#FFF}
.tool-hero.photo .sub,.page-hero.photo p{color:rgba(255,255,255,.94)}
.tool-hero.photo .zh-sub,.page-hero.photo .zh-sub{color:rgba(255,255,255,.78)}
.tool-hero.photo .breadcrumb,.page-hero.photo .breadcrumb{color:rgba(255,255,255,.82)}
.tool-hero.photo .breadcrumb a,.page-hero.photo .breadcrumb a{color:#FFF}
.tool-hero.photo .hero-actions,.page-hero.photo .hero-actions{position:relative;z-index:2}
@media(max-width:640px){.tool-hero.photo,.page-hero.photo{padding:46px 0 40px}}