/* ==========================================================================
   MenuMeld SEO landing pages — shared stylesheet
   Mirrors the design system of features.html so every topic page matches the
   main site's "deep dive" feature style and depth. Dark mode by default,
   light theme via [data-theme="light"]. Loaded by every /landing SEO page.
   ========================================================================== */

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#0a0a0f;--bg-card:#13131a;--bg-card-hover:#1a1a24;
  --text:#f0f0f5;--text-muted:#8a8a9a;--text-dim:#5a5a6a;
  --accent:#ff6b35;--accent-glow:rgba(255,107,53,0.15);
  --accent-2:#34c759;--accent-2-glow:rgba(52,199,89,0.15);
  --accent-3:#5e5ce6;--accent-3-glow:rgba(94,92,230,0.15);
  --accent-4:#ff375f;--accent-5:#ffd60a;
  --border:rgba(255,255,255,0.06);--border-hover:rgba(255,255,255,0.12);
  --radius:16px;--radius-lg:24px;--radius-pill:100px;
  --gradient-1:linear-gradient(135deg,#ff6b35,#ff375f);
  --gradient-2:linear-gradient(135deg,#34c759,#30d158);
  --gradient-3:linear-gradient(135deg,#5e5ce6,#bf5af2);
  --shadow-card:0 1px 3px rgba(0,0,0,0.3),0 4px 20px rgba(0,0,0,0.2);
  --font:'Inter','Noto Sans TC','Noto Sans SC',-apple-system,BlinkMacSystemFont,sans-serif;
}
[data-theme="light"]{
  --bg:#f8f8fc;--bg-card:#ffffff;--bg-card-hover:#f0f0f5;
  --text:#1a1a2e;--text-muted:#5a5a70;--text-dim:#8a8a9a;
  --border:rgba(0,0,0,0.08);--border-hover:rgba(0,0,0,0.14);
  --shadow-card:0 1px 3px rgba(0,0,0,0.08),0 4px 20px rgba(0,0,0,0.06);
}
[data-theme="light"] .nav.scrolled{background:rgba(248,248,252,0.9)}
[data-theme="light"] .phone{background:#f5f5f7;border-color:rgba(0,0,0,0.1);box-shadow:0 20px 60px rgba(0,0,0,0.12)}
[data-theme="light"] .phone .notch{background:#e0e0e0}
[data-theme="light"] .phone .s-title{color:#1a1a2e}
[data-theme="light"] .mock-card{background:rgba(0,0,0,0.03);border-color:rgba(0,0,0,0.06)}
[data-theme="light"] .mock-card .name{color:#1a1a2e}
[data-theme="light"] .nav-cta{background:#1a1a2e;color:#fff}
[data-theme="light"] .btn-primary{background:#1a1a2e;color:#fff}
[data-theme="light"] .mobile-menu{background:rgba(248,248,252,0.97)}
[data-theme="light"] .lang-btn{background:rgba(0,0,0,0.04);border-color:rgba(0,0,0,0.1)}
[data-theme="light"] .lang-dropdown{background:#fff;border-color:rgba(0,0,0,0.1);box-shadow:0 8px 30px rgba(0,0,0,0.12)}
[data-theme="light"] .detail-list .item{border-color:rgba(0,0,0,0.06)}
[data-theme="light"] .tag{background:rgba(0,0,0,0.03);border-color:rgba(0,0,0,0.08);color:var(--text-muted)}
[data-theme="light"] .sug-card .sug-title{color:#1a1a2e}
[data-theme="light"] .callout{background:rgba(0,0,0,0.02)}

.theme-toggle{background:none;border:none;cursor:pointer;color:var(--text-muted);padding:6px;display:flex;align-items:center;justify-content:center;border-radius:8px;transition:color .2s,background .2s}
.theme-toggle:hover{color:var(--text);background:rgba(128,128,128,0.1)}
.theme-toggle svg{width:18px;height:18px}
.theme-toggle .icon-sun{display:none}
.theme-toggle .icon-moon{display:block}
[data-theme="light"] .theme-toggle .icon-sun{display:block}
[data-theme="light"] .theme-toggle .icon-moon{display:none}

html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;overflow-x:hidden;line-height:1.6}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

@keyframes fadeInUp{from{opacity:0;transform:translateY(40px)}to{opacity:1;transform:translateY(0)}}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
@keyframes pulse{0%,100%{opacity:.4}50%{opacity:1}}
@keyframes barFill{from{width:0}to{width:var(--bar-w,80%)}}
@keyframes barFillSlow{0%,10%{width:0}90%,100%{width:var(--bar-w,80%)}}
@keyframes sparklePulse{0%,100%{transform:scale(1);opacity:.7}50%{transform:scale(1.25);opacity:1}}
@keyframes ringFillSmall{from{stroke-dashoffset:88}to{stroke-dashoffset:16}}
.anim{opacity:0;transform:translateY(40px);transition:opacity .7s ease,transform .7s ease}
.anim.visible{opacity:1;transform:translateY(0)}
@media (prefers-reduced-motion: reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}.anim{opacity:1;transform:none}}

/* NAV */
.nav{position:fixed;top:0;left:0;right:0;z-index:1000;padding:16px 0;transition:background .3s,backdrop-filter .3s}
.nav.scrolled{background:rgba(10,10,15,0.85);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--border)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;max-width:1200px;margin:0 auto;padding:0 24px}
.nav-logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;letter-spacing:-.02em}
.nav-logo-icon{width:36px;height:36px;border-radius:10px;object-fit:cover}
.brand-alt-name{font-size:14px;color:var(--text-muted);font-weight:500}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-link{font-size:15px;font-weight:500;color:var(--text-muted);transition:color .2s}
.nav-link:hover{color:var(--text)}
.nav-cta{display:inline-flex;align-items:center;gap:8px;padding:10px 24px;background:var(--text);color:var(--bg);font-weight:600;font-size:14px;border-radius:var(--radius-pill);transition:transform .2s,box-shadow .2s}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 4px 20px rgba(255,255,255,0.15)}
.nav-cta svg{width:16px;height:16px}
.lang-switcher{position:relative}
.lang-btn{display:flex;align-items:center;gap:6px;padding:6px 14px;background:rgba(255,255,255,0.06);border:1px solid var(--border);border-radius:8px;color:var(--text-muted);font-size:13px;font-weight:500;cursor:pointer;font-family:inherit;transition:background .2s}
.lang-btn:hover{background:rgba(255,255,255,0.1);color:var(--text)}
.lang-btn svg{width:14px;height:14px}
.lang-dropdown{position:absolute;top:calc(100% + 6px);right:0;background:var(--bg-card);border:1px solid var(--border-hover);border-radius:10px;padding:4px;min-width:140px;box-shadow:0 8px 30px rgba(0,0,0,0.4);display:none;z-index:1001}
.lang-dropdown.open{display:block}
.lang-option{display:block;width:100%;padding:8px 14px;border:none;background:none;color:var(--text-muted);font-size:13px;font-weight:500;cursor:pointer;border-radius:6px;text-align:left;font-family:inherit;transition:background .15s}
.lang-option:hover{background:rgba(255,255,255,0.06);color:var(--text)}
.lang-option.active{color:var(--accent);background:var(--accent-glow)}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:4px;z-index:1001;background:none;border:none}
.hamburger span{width:24px;height:2px;background:var(--text);transition:transform .3s,opacity .3s;border-radius:2px;display:block}
.hamburger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.hamburger.open span:nth-child(2){opacity:0}
.hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.mobile-menu{display:none;position:fixed;inset:0;background:rgba(10,10,15,0.97);z-index:999;flex-direction:column;align-items:center;justify-content:center;gap:28px}
.mobile-menu.open{display:flex}
.mobile-menu a{font-size:26px;font-weight:600;color:var(--text)}
.lang-switcher-mobile{display:flex;gap:10px;margin-top:8px}
.lang-switcher-mobile .lang-option{width:auto;padding:8px 16px;border:1px solid var(--border);border-radius:var(--radius-pill)}

/* PAGE HERO */
.page-hero{padding:140px 0 70px;text-align:center;position:relative;overflow:hidden}
.page-hero::before{content:'';position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:600px;height:600px;background:radial-gradient(ellipse,rgba(255,107,53,0.06),rgba(94,92,230,0.04),transparent 70%);border-radius:50%;pointer-events:none}
.page-hero .container{position:relative;z-index:1}
.page-hero .back-link{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--text-muted);margin-bottom:22px;transition:color .2s}
.page-hero .back-link:hover{color:var(--accent)}
.breadcrumb{font-size:13px;color:var(--text-dim);margin-bottom:18px}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--text)}
.hero-pill{display:inline-flex;align-items:center;gap:8px;padding:7px 16px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-pill);font-size:13px;font-weight:500;color:var(--text-muted);margin-bottom:22px}
.hero-pill-dot{width:7px;height:7px;border-radius:50%;background:var(--accent-2);box-shadow:0 0 10px var(--accent-2)}
.page-hero h1{font-size:clamp(34px,6vw,66px);font-weight:800;letter-spacing:-.03em;line-height:1.1;margin-bottom:18px}
.page-hero h1 .grad{background:var(--gradient-1);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.page-hero h1 .grad2{background:var(--gradient-2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.page-hero h1 .grad3{background:var(--gradient-3);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.page-hero .lede{font-size:clamp(16px,2vw,20px);color:var(--text-muted);max-width:640px;margin:0 auto 30px;line-height:1.7}
.hero-ctas{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn-primary{display:inline-flex;align-items:center;gap:10px;padding:15px 30px;background:var(--text);color:var(--bg);font-weight:600;font-size:16px;border-radius:var(--radius-pill);transition:transform .2s,box-shadow .2s}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 40px rgba(255,255,255,0.18)}
.btn-primary svg{width:20px;height:20px}
.btn-secondary{display:inline-flex;align-items:center;gap:8px;padding:15px 28px;background:var(--bg-card);border:1px solid var(--border);color:var(--text);font-weight:600;font-size:16px;border-radius:var(--radius-pill);transition:border-color .2s,transform .2s}
.btn-secondary:hover{border-color:var(--border-hover);transform:translateY(-2px)}

/* FEATURE SECTION */
.feat-section{padding:72px 0;position:relative}
.feat-section:nth-child(even){background:rgba(255,255,255,0.01)}
[data-theme="light"] .feat-section:nth-child(even){background:rgba(0,0,0,0.015)}
.feat-section .section-label{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--accent);text-transform:uppercase;letter-spacing:1.5px;margin-bottom:12px}
.feat-section .section-label .line{width:24px;height:2px;background:var(--accent);border-radius:2px}
.feat-section h2{font-size:clamp(26px,4vw,42px);font-weight:800;line-height:1.12;letter-spacing:-.02em;margin-bottom:16px}
.feat-section .desc{font-size:16px;color:var(--text-muted);line-height:1.7;margin-bottom:24px;max-width:520px}
.feat-row{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.feat-row.reverse .feat-text{order:2}
.feat-row.reverse .feat-visual{order:1}

/* Detail lists */
.detail-list{display:flex;flex-direction:column;gap:0;margin-top:20px}
.detail-list .item{display:flex;gap:12px;padding:14px 0;border-bottom:1px solid var(--border)}
.detail-list .item:last-child{border-bottom:none}
.detail-list .icon{width:32px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}
.detail-list .icon.orange{background:var(--accent-glow)}
.detail-list .icon.green{background:var(--accent-2-glow)}
.detail-list .icon.purple{background:var(--accent-3-glow)}
.detail-list .icon.yellow{background:rgba(255,214,10,0.15)}
.detail-list .item h3{font-size:14px;font-weight:600;margin-bottom:2px}
.detail-list .item p{font-size:13px;color:var(--text-muted);line-height:1.5}

/* Tags */
.tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:16px}
.tag{font-size:11px;padding:4px 10px;border-radius:8px;background:rgba(255,255,255,0.04);border:1px solid var(--border);color:var(--text-muted);font-weight:500}
.tag.hi{background:var(--accent-glow);border-color:rgba(255,107,53,0.3);color:var(--accent)}

/* Callout (truthful clarifications) */
.callout{background:rgba(255,255,255,0.02);border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:var(--radius);padding:18px 22px;margin-top:28px;max-width:760px}
.callout p{color:var(--text-muted);font-size:14px;line-height:1.6}
.callout strong{color:var(--text)}

/* PHONE MOCKUP */
.phone{width:280px;height:560px;background:#1c1c1e;border-radius:40px;border:3px solid rgba(255,255,255,0.1);overflow:hidden;box-shadow:0 0 0 1px rgba(255,255,255,0.05),0 20px 60px rgba(0,0,0,0.4);position:relative;flex-shrink:0;margin:0 auto}
.phone.float{animation:float 6s ease-in-out infinite;will-change:transform}
.phone .notch{width:120px;height:32px;background:#000;border-radius:0 0 20px 20px;margin:0 auto;position:relative;z-index:5}
.phone .screen{padding:8px 14px;height:calc(100% - 32px);overflow:hidden;position:relative}
.phone .s-title{font-size:16px;font-weight:700;color:#fff}
.phone .s-sub{font-size:10px;color:var(--text-dim);margin-top:2px}
.phone .s-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;padding-top:4px}

/* Mock cards */
.mock-card{background:rgba(255,255,255,0.04);border:1px solid rgba(255,255,255,0.06);border-radius:12px;padding:10px;display:flex;align-items:center;gap:10px;margin-bottom:6px}
.mock-card .emoji{width:32px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}
.mock-card .name{font-size:12px;font-weight:600;color:#fff}
.mock-card .meta{font-size:9px;color:var(--text-dim);margin-top:1px}
.mock-chip{font-size:8px;padding:2px 6px;border-radius:6px;background:rgba(255,255,255,0.04);color:var(--text-dim);display:inline-block;margin-right:4px;margin-top:3px}
.slot-lbl{font-size:9px;font-weight:600;color:var(--text-dim);text-transform:uppercase;letter-spacing:.5px;margin:6px 0 3px}

/* Filter chips mock */
.filter-row{display:flex;gap:4px;flex-wrap:wrap;margin-bottom:8px}
.filter-chip{font-size:9px;padding:3px 8px;border-radius:6px;background:rgba(255,255,255,0.04);border:1px solid rgba(255,255,255,0.06);color:var(--text-dim)}
.filter-chip.on{background:var(--accent);color:#fff;border-color:var(--accent)}

/* Calendar mock */
.cal-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:2px;font-size:8px;text-align:center}
.cal-grid .hd{color:var(--text-dim);padding:2px;font-weight:600}
.cal-grid .day{padding:3px 1px;border-radius:4px;color:var(--text-muted)}
.cal-grid .day.today{background:var(--accent);color:#fff;font-weight:700}
.cal-grid .day .dot{width:4px;height:4px;border-radius:50%;margin:1px auto 0;display:block}

/* Suggestion / highlight card mock */
.sug-card{background:rgba(52,199,89,0.08);border:1px solid rgba(52,199,89,0.15);border-radius:10px;padding:10px;margin-top:6px}
.sug-card .sug-title{font-size:11px;font-weight:700;color:#fff}
.sug-card .sug-meta{font-size:9px;color:var(--text-dim);margin-top:2px}
.sug-card .sug-btn{margin-top:6px;background:#34c759;color:#fff;text-align:center;padding:5px;border-radius:6px;font-size:10px;font-weight:600}
.mock-ring{position:relative;width:88px;height:88px;margin:6px auto 8px}
.mock-ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.mock-ring .bg{fill:none;stroke:rgba(255,255,255,0.08);stroke-width:7}
.mock-ring .fg{fill:none;stroke:url(#mrg);stroke-width:7;stroke-linecap:round;stroke-dasharray:251;stroke-dashoffset:60}
.mock-ring .num{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}
.mock-ring .num b{font-size:24px;font-weight:800;color:#fff;line-height:1}
.mock-ring .num span{font-size:8px;color:var(--text-dim);text-transform:uppercase;letter-spacing:1px;margin-top:2px}

/* FAQ */
.faq-list{max-width:780px;margin-top:8px}
.faq-item{border-bottom:1px solid var(--border)}
.faq-q{width:100%;text-align:left;background:none;border:none;color:var(--text);font-family:inherit;font-size:17px;font-weight:600;padding:22px 40px 22px 0;cursor:pointer;position:relative;display:flex}
.faq-q::after{content:'+';position:absolute;right:4px;top:50%;transform:translateY(-50%);font-size:24px;color:var(--text-muted);font-weight:400;transition:transform .2s}
.faq-item.open .faq-q::after{transform:translateY(-50%) rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease,padding .3s ease}
.faq-item.open .faq-a{max-height:600px;padding-bottom:22px}
.faq-a p{color:var(--text-muted);font-size:15px;line-height:1.7}

/* RELATED TOPICS */
.related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin-top:8px}
.related-card{display:flex;align-items:center;gap:12px;padding:16px 18px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);font-size:15px;font-weight:600;transition:transform .2s,border-color .2s,background .2s}
.related-card:hover{transform:translateY(-2px);border-color:var(--border-hover);background:var(--bg-card-hover)}
.related-card .arrow{margin-left:auto;color:var(--text-dim)}

/* CTA BANNER */
.cta-banner{text-align:center;padding:70px 0}
.cta-inner{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:56px 32px;position:relative;overflow:hidden}
.cta-inner h2{font-size:clamp(26px,4vw,36px);font-weight:800;letter-spacing:-.02em;margin-bottom:14px}
.cta-inner p{color:var(--text-muted);font-size:17px;margin-bottom:28px;max-width:540px;margin-left:auto;margin-right:auto}

/* FOOTER */
.footer{border-top:1px solid var(--border);padding:56px 0 32px;margin-top:8px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand p{color:var(--text-muted);font-size:14px;margin-top:14px;max-width:280px}
.footer-col h4{font-size:14px;font-weight:700;margin-bottom:14px}
.footer-col a{display:block;color:var(--text-muted);font-size:14px;margin-bottom:10px;transition:color .2s}
.footer-col a:hover{color:var(--text)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;padding-top:24px;border-top:1px solid var(--border);color:var(--text-dim);font-size:13px;flex-wrap:wrap;gap:16px}
.footer-social a{color:var(--text-muted);transition:color .2s}
.footer-social a:hover{color:var(--text)}

/* RESPONSIVE */
@media(max-width:1024px){
  .feat-row{grid-template-columns:1fr;gap:40px;text-align:center}
  .feat-row.reverse .feat-text,.feat-row.reverse .feat-visual{order:unset}
  .feat-text{max-width:600px;margin:0 auto}
  .detail-list{max-width:500px;margin:20px auto 0}
  .feat-section .desc{margin-left:auto;margin-right:auto}
  .callout{margin-left:auto;margin-right:auto;text-align:left}
}
@media(max-width:768px){
  .nav-links{display:none}
  .hamburger{display:flex}
  .phone{width:240px;height:480px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
}
@media(max-width:480px){
  .phone{width:220px;height:440px}
  .footer-grid{grid-template-columns:1fr}
}