/* ya!smile · 2026/06/02 v3 · Apple 滿版 · 橘色 CIS #ed5000
   CIS 規範:
   - 活力橘 #ed5000 (Pantone 166C)
   - 白 #ffffff
   - 淺灰 #efefef (Cool Gray 1C)
   - 深藍灰 #292e37
   - 字型:Poppins (Clarika geometric 替代) + Noto Sans CJK TC */

:root{
  --orange:#ed5000;
  --orange-d:#c44400;
  --orange-l:#fff2ea;
  --ink:#292e37;
  --ink-soft:#4a4f59;
  --gray:#6b7280;
  --gray-l:#efefef;
  --line:#e7e8eb;
  --bg:#ffffff;
  --soft:#fafbfc;

  --sans:'Poppins','Noto Sans TC',-apple-system,BlinkMacSystemFont,sans-serif;
  --en:'Poppins',sans-serif;
  --maxw:1180px;
  --maxw-narrow:980px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.wrap-narrow{max-width:var(--maxw-narrow);margin:0 auto;padding:0 24px}
section{padding:120px 0}
h1,h2,h3{line-height:1.15;font-weight:700;letter-spacing:-.02em}
.eyebrow{color:var(--orange);font-weight:600;font-size:13px;letter-spacing:.14em;text-transform:uppercase;margin-bottom:14px}
.lead{font-size:19px;color:var(--ink-soft);line-height:1.7;font-weight:400}

/* === 導覽 === */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.85);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid rgba(231,232,235,.6)}
.nav-in{display:flex;align-items:center;gap:32px;max-width:var(--maxw);margin:0 auto;padding:14px 24px}
.logo{display:inline-flex;align-items:center;line-height:1;color:var(--orange);transition:opacity .2s}
.logo:hover{opacity:.8}
.logo svg{height:28px;width:auto;display:block;color:currentColor}
.nav-links{display:flex;gap:28px;margin-left:auto;align-items:center;font-size:14px;font-weight:500}
.nav-links a{color:var(--ink);transition:color .2s}
.nav-links a:hover{color:var(--orange)}
.nav-cta{background:var(--orange);color:#fff!important;padding:8px 18px;border-radius:980px;font-weight:600;font-size:13.5px}
.nav-cta:hover{background:var(--orange-d);color:#fff!important}

/* === 按鈕 (Apple pill) === */
.btn{display:inline-block;font-weight:600;padding:14px 30px;border-radius:980px;font-size:15.5px;transition:all .25s cubic-bezier(.4,0,.2,1);cursor:pointer;border:none;text-align:center;letter-spacing:-.01em}
.btn-primary{background:var(--orange);color:#fff}
.btn-primary:hover{background:var(--orange-d);transform:translateY(-1px);box-shadow:0 12px 24px rgba(237,80,0,.3)}
.btn-ghost{background:transparent;color:var(--ink);border:1.5px solid var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff}

/* === Hero · 滿版橘色漸層 (v7 rollback) · 文案左 · 圖右人臉 === */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden;color:#fff;padding:100px 0 60px;background:var(--ink)}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg img{width:100%;height:100%;object-fit:cover;display:block;filter:saturate(1.06) contrast(1.03);object-position:right center}
/* 漸層覆蓋:左側深 + 中橘色 + 右側透明 (留人臉) */
.hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(95deg,
    rgba(196,68,0,.94) 0%,
    rgba(237,80,0,.82) 28%,
    rgba(237,80,0,.5) 48%,
    rgba(0,0,0,.05) 64%,
    transparent 75%)}
.hero-content{position:relative;z-index:1;max-width:var(--maxw);margin:0 auto;padding:0 24px;width:100%}
.hero-text{max-width:620px}
.hero .eyebrow{color:rgba(255,255,255,.92);font-weight:600;letter-spacing:.16em;margin-bottom:18px}
.hero h1{font-size:60px;color:#fff;font-weight:800;letter-spacing:-.028em;line-height:1.08;margin-bottom:22px;text-wrap:balance}
.hero h1 .b{display:block;font-weight:600;opacity:.95}
.hero .lead{color:rgba(255,255,255,.95);font-size:19px;line-height:1.55;max-width:560px;font-weight:400;margin-bottom:28px}
.hero-spirit{margin:0 0 30px;padding:18px 24px;background:rgba(255,255,255,.16);border-left:3px solid #fff;border-radius:8px;font-size:16.5px;color:#fff;line-height:1.5;font-style:italic;backdrop-filter:blur(8px);max-width:560px;font-weight:500}

/* Featured 1000+ */
.hero-featured{display:flex;align-items:baseline;gap:14px;margin-bottom:24px;max-width:560px}
.hero-featured .big{font-family:var(--en);font-weight:800;font-size:68px;color:#fff;line-height:1;letter-spacing:-.03em}
.hero-featured .meta{display:flex;flex-direction:column;gap:2px;padding-bottom:6px}
.hero-featured .meta .l{font-size:15px;color:#fff;font-weight:600;letter-spacing:.02em}

.hero-stats{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:32px;max-width:580px}
.hero-stats .stat{background:rgba(255,255,255,.13);border-radius:10px;padding:12px 16px;backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.18);flex:1;min-width:160px}
.hero-stats .stat .n{font-family:var(--en);font-weight:700;font-size:13.5px;color:#fff;display:block;line-height:1.3}
.hero-stats .stat .l{font-size:11.5px;color:rgba(255,255,255,.78);margin-top:3px;display:block;letter-spacing:.02em}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.hero .btn-primary{background:#fff;color:var(--ink)}
.hero .btn-primary:hover{background:rgba(255,255,255,.92);transform:translateY(-2px);box-shadow:0 14px 30px rgba(0,0,0,.2)}
.hero .btn-ghost{color:#fff;border-color:#fff}
.hero .btn-ghost:hover{background:#fff;color:var(--orange)}

/* Sub-graphic 小裝飾:Hero 右下方 (CIS Primary 笑臉) */
.hero-deco{position:absolute;right:6%;bottom:8%;z-index:1;width:120px;height:auto;opacity:.22;color:#fff;pointer-events:none}
.hero-deco svg{width:100%;height:auto;display:block}

.hero-scroll{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);z-index:2;color:rgba(255,255,255,.7);font-size:11px;letter-spacing:.18em;text-transform:uppercase;text-align:center;animation:bob 2.4s ease-in-out infinite}
.hero-scroll::after{content:"";display:block;width:1px;height:32px;background:rgba(255,255,255,.45);margin:10px auto 0}
@keyframes bob{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,6px)}}

/* === 答案優先 === */
.answer-box{background:var(--orange-l);border-left:4px solid var(--orange);border-radius:0 14px 14px 0;padding:28px 32px;margin:0 0 8px}
.answer-box p{font-size:18px;color:var(--ink);margin:0;line-height:1.7}
.answer-box p strong{color:var(--orange-d);font-weight:700}

/* === 區塊標題 === */
.sec-head{text-align:center;max-width:780px;margin:0 auto 64px}
.sec-head h2{font-size:48px;color:var(--ink);font-weight:800;letter-spacing:-.028em;line-height:1.1}
.sec-head .lead{margin-top:18px;font-size:19px;color:var(--ink-soft)}
.bg-soft{background:var(--gray-l)}

/* === About === */
.about-block{text-align:center;max-width:860px;margin:0 auto}
.about-block h2{font-size:40px;color:var(--ink);font-weight:800;letter-spacing:-.025em;margin-bottom:20px;line-height:1.15}
.about-block .lead{font-size:21px;color:var(--ink-soft);line-height:1.6}

/* === Split === */
.split{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.split.reverse{direction:rtl}
.split.reverse>*{direction:ltr}
.split-image{position:relative;border-radius:24px;overflow:hidden;aspect-ratio:4/3;background:var(--gray-l)}
.split-image img{width:100%;height:100%;object-fit:cover;display:block;transition:transform 4s ease-out}
.split-image:hover img{transform:scale(1.03)}
.split-text h2{font-size:38px;color:var(--ink);margin-bottom:18px;font-weight:800;letter-spacing:-.025em;line-height:1.15}
.split-text .answer-box{margin-bottom:20px}
.split-text .extended{font-size:16.5px;color:var(--ink-soft);line-height:1.8}
@media(max-width:880px){.split,.split.reverse{grid-template-columns:1fr;direction:ltr}}

/* === Retainer 4 features === */
.feat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:24px}
.feat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px;display:flex;align-items:center;gap:14px;transition:all .25s}
.feat:hover{border-color:var(--orange);box-shadow:0 8px 20px rgba(237,80,0,.08)}
.feat .icon{width:38px;height:38px;border-radius:50%;background:var(--orange-l);color:var(--orange);display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}
.feat .text{font-size:14px;color:var(--ink);line-height:1.5;font-weight:500}

/* === Tech 段 (深底 · 三段:SmileGrap + 6-tech grid + 認證) === */
.tech-section{background:var(--ink);color:#fff;padding:140px 0}
.tech-section .sec-head h2{color:#fff}
.tech-section .sec-head .lead{color:rgba(255,255,255,.75)}
.tech-section .eyebrow{color:var(--orange)}

/* === SmileGrap 大區塊 · Apple 式底圖 + 旋轉牙套照 + 笑臉裝飾 === */
.smilegrap{max-width:var(--maxw);margin:0 auto 96px;padding:0 24px;display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center;position:relative}
.smilegrap-text{position:relative;z-index:2}
.smilegrap-text h3{font-size:64px;color:#fff;font-weight:800;letter-spacing:-.035em;line-height:1;margin-bottom:14px}
.smilegrap-text h3 sup{font-size:22px;font-weight:600;color:var(--orange);vertical-align:top;margin-left:4px;letter-spacing:.04em;display:inline-block;margin-top:8px}
.smilegrap-text .subtitle{font-size:13px;color:var(--orange);font-weight:700;letter-spacing:.12em;text-transform:uppercase;margin-bottom:20px}
.smilegrap-text .desc{font-size:17.5px;color:rgba(255,255,255,.82);line-height:1.7;margin-bottom:24px;max-width:520px}
.smilegrap-bullets{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.smilegrap-bullets li{list-style:none;font-size:14.5px;color:rgba(255,255,255,.95);display:flex;align-items:center;gap:10px;padding:11px 16px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.06);border-radius:10px;font-weight:500;backdrop-filter:blur(8px)}
.smilegrap-bullets li::before{content:"";width:6px;height:6px;background:var(--orange);border-radius:50%;flex-shrink:0}

/* Apple 式視覺:Aligner 透明牙套 · 不旋轉 · 純深底 · 居中橘色光暈 */
.smilegrap-visual{position:relative;aspect-ratio:1;display:flex;align-items:center;justify-content:center;overflow:hidden;min-height:460px;
    border-radius:32px;
    background:
        radial-gradient(ellipse at 50% 50%, rgba(237,80,0,.20) 0%, rgba(237,80,0,.04) 48%, transparent 72%),
        linear-gradient(180deg, rgba(255,255,255,.02), transparent);
    border:1px solid rgba(255,255,255,.08)}
/* 底層發光圈 (居中) */
.smilegrap-visual::before{content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
    width:78%;height:78%;border-radius:50%;
    background:radial-gradient(circle, rgba(237,80,0,.55) 0%, rgba(237,80,0,.15) 32%, transparent 62%);
    filter:blur(44px);z-index:0;pointer-events:none}
/* 主圖:透明 PNG 牙套,正中不旋轉,浮在橘色光暈上 */
.smilegrap-visual .aligner-img{position:relative;z-index:2;width:88%;max-width:580px;height:auto;
    filter:drop-shadow(0 24px 50px rgba(0,0,0,.55)) drop-shadow(0 0 30px rgba(255,255,255,.22)) brightness(1.1) contrast(1.05);
    transition:transform .6s cubic-bezier(.2,.8,.2,1)}
.smilegrap-visual:hover .aligner-img{transform:translateY(-6px) scale(1.02)}
/* SG™ 圓徽 (Apple 角標) */
.smilegrap-visual .sg-mark{position:absolute;bottom:20px;right:20px;z-index:4;
    background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);
    backdrop-filter:blur(16px);padding:9px 16px;border-radius:980px;
    font-family:var(--en);font-weight:700;font-size:14px;color:#fff;letter-spacing:.04em;
    display:inline-flex;align-items:center;gap:4px}
.smilegrap-visual .sg-mark sup{font-size:9px;color:var(--orange);font-weight:700;letter-spacing:.06em;margin-left:2px}

/* === 六大製程 hero 機器人視覺 (Apple 式產品攝影 banner) === */
.tech-banner{position:relative;max-width:var(--maxw);margin:0 auto 56px;padding:0 24px}
.tech-banner-inner{position:relative;border-radius:28px;overflow:hidden;aspect-ratio:21/9;background:#000;
    box-shadow:0 30px 70px -20px rgba(0,0,0,.6)}
.tech-banner-inner img{width:100%;height:100%;object-fit:cover;display:block;filter:saturate(.92) brightness(.95) contrast(1.08)}
/* 漸層覆蓋:從左下深 → 右上透明,作為文字底 */
.tech-banner-inner::after{content:"";position:absolute;inset:0;
    background:linear-gradient(110deg, rgba(15,18,24,.86) 0%, rgba(15,18,24,.65) 30%, rgba(15,18,24,.2) 55%, transparent 70%),
        linear-gradient(180deg, transparent 60%, rgba(237,80,0,.18) 100%);
    pointer-events:none}
.tech-banner-text{position:absolute;left:48px;bottom:48px;z-index:2;max-width:520px;color:#fff}
.tech-banner-text .label{font-size:11px;color:var(--orange);font-weight:700;letter-spacing:.16em;text-transform:uppercase;margin-bottom:14px;display:flex;align-items:center;gap:10px}
.tech-banner-text .label::before{content:"";width:24px;height:2px;background:var(--orange);display:inline-block}
.tech-banner-text h3{font-size:34px;color:#fff;font-weight:800;letter-spacing:-.02em;line-height:1.15;margin-bottom:10px}
.tech-banner-text p{font-size:15px;color:rgba(255,255,255,.85);line-height:1.6;font-weight:400}
@media(max-width:760px){
    .tech-banner-inner{aspect-ratio:4/3}
    .tech-banner-text{left:24px;bottom:24px;right:24px}
    .tech-banner-text h3{font-size:24px}
    .tech-banner-text p{font-size:14px}
}

/* About 區 sub-graphic 點綴 */
.about-block .smile-accent{display:inline-flex;width:36px;height:auto;color:var(--orange);margin-bottom:18px;opacity:.85}
.about-block .smile-accent svg{width:100%;height:auto}
/* CTA 區 sub-graphic 點綴 */
.cta-band .smile-accent{display:inline-flex;width:44px;height:auto;color:var(--orange);margin-bottom:14px;opacity:.95;position:relative;z-index:2}
.cta-band .smile-accent svg{width:100%;height:auto}

/* 6 大核心技術 grid */
.tech-section-mid{margin-bottom:96px}
.tech-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.tech-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:18px;padding:32px 28px;transition:all .3s}
.tech-card:hover{background:rgba(237,80,0,.08);border-color:rgba(237,80,0,.4);transform:translateY(-3px)}
.tech-card .num{font-family:var(--en);font-weight:700;font-size:13px;color:var(--orange);letter-spacing:.1em;margin-bottom:14px;display:block}
.tech-card h4{font-size:19px;color:#fff;font-weight:700;line-height:1.3;margin-bottom:12px;letter-spacing:-.015em}
.tech-card p{color:rgba(255,255,255,.7);font-size:14px;line-height:1.7}
@media(max-width:880px){.tech-grid{grid-template-columns:1fr}.smilegrap{grid-template-columns:1fr;gap:36px}}

/* 認證帶 (cert section, 在 tech-section 內,橘底白字) */
.cert-band{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.cert-inner{background:linear-gradient(135deg,var(--orange) 0%,var(--orange-d) 100%);border-radius:24px;padding:60px 56px;display:grid;grid-template-columns:auto 1fr;gap:48px;align-items:center;position:relative;overflow:hidden}
.cert-inner::after{content:"";position:absolute;right:-15%;top:-50%;width:400px;height:400px;background:radial-gradient(circle,rgba(255,255,255,.15),transparent 70%);border-radius:50%}
.cert-badge{background:rgba(255,255,255,.15);border:2px solid rgba(255,255,255,.4);border-radius:18px;padding:24px 28px;text-align:center;min-width:200px;position:relative;z-index:1;backdrop-filter:blur(8px)}
.cert-badge .n{font-family:var(--en);font-weight:800;font-size:30px;color:#fff;letter-spacing:-.02em;line-height:1;display:block}
.cert-badge .l{font-size:13px;color:rgba(255,255,255,.85);margin-top:8px;letter-spacing:.04em;font-weight:500}
.cert-text{position:relative;z-index:1}
.cert-text h3{font-size:26px;color:#fff;font-weight:700;margin-bottom:14px;letter-spacing:-.02em}
.cert-text p{color:rgba(255,255,255,.92);font-size:15.5px;line-height:1.7}
@media(max-width:760px){.cert-inner{grid-template-columns:1fr;gap:28px;padding:40px 28px}.cert-text h3{font-size:22px}}

/* === FAQ === */
.faq-list{max-width:860px;margin:0 auto}
.faq{background:#fff;border:1px solid var(--line);border-radius:16px;margin-bottom:12px;overflow:hidden;transition:all .25s}
.faq:hover{border-color:rgba(237,80,0,.4)}
.faq[open]{border-color:var(--orange);box-shadow:0 8px 24px rgba(237,80,0,.08)}
.faq summary{padding:24px 28px;font-weight:600;font-size:17px;color:var(--ink);cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:28px;color:var(--orange);flex-shrink:0;font-weight:300;transition:transform .25s}
.faq[open] summary::after{content:"−"}
.faq .a{padding:0 28px 26px;color:var(--ink-soft);font-size:16px;line-height:1.8}

/* === CTA (深底 · 雙 CTA · 無 find clinic) === */
.cta-band{background:var(--ink);color:#fff;border-radius:32px;padding:80px 40px;text-align:center;position:relative;overflow:hidden;max-width:var(--maxw);margin:0 auto}
.cta-band::before{content:"";position:absolute;left:-15%;top:-50%;width:500px;height:500px;background:radial-gradient(circle,rgba(237,80,0,.35),transparent 65%);border-radius:50%}
.cta-band::after{content:"";position:absolute;right:-10%;bottom:-50%;width:400px;height:400px;background:radial-gradient(circle,rgba(237,80,0,.25),transparent 65%);border-radius:50%}
.cta-band h2{font-size:42px;color:#fff;margin-bottom:20px;font-weight:800;position:relative;z-index:1;letter-spacing:-.025em}
.cta-band p{color:rgba(255,255,255,.82);max-width:640px;margin:0 auto 32px;position:relative;z-index:1;font-size:17px;line-height:1.7}
.cta-band .btn-row{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;position:relative;z-index:1}
.cta-band .btn-primary{background:var(--orange);color:#fff;padding:18px 36px;font-size:16px}
.cta-band .btn-primary:hover{background:#fff;color:var(--orange);transform:translateY(-2px);box-shadow:0 16px 40px rgba(255,255,255,.2)}
.cta-band .btn-ghost{background:transparent;color:#fff;border:1.5px solid #fff;padding:18px 36px;font-size:16px}
.cta-band .btn-ghost:hover{background:#fff;color:var(--ink)}

/* === Footer === */
.footer{background:var(--ink);color:#a8aeb8;padding:72px 0 36px;font-size:14px}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px;max-width:var(--maxw);margin-left:auto;margin-right:auto;padding:0 24px}
.footer .logo{color:var(--orange);margin-bottom:16px}
.footer .logo svg{height:30px}
.footer .pos{line-height:1.7;margin-top:10px;font-size:14px}
.footer h4{color:#fff;font-size:14px;margin-bottom:16px;font-weight:600;letter-spacing:.02em}
.footer a{display:block;color:#a8aeb8;margin-bottom:10px;transition:color .2s;font-size:13.5px}
.footer a:hover{color:var(--orange)}
.foot-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:28px;text-align:center;color:#7d8390;font-size:12.5px;line-height:1.9;max-width:var(--maxw);margin:0 auto;padding-left:24px;padding-right:24px}
.foot-bottom .cert{color:#a8aeb8;font-weight:500}
.foot-bottom .ip{display:block;margin-top:14px;padding-top:14px;border-top:1px dashed rgba(255,255,255,.08);color:#7d8390;font-size:12px;letter-spacing:.02em}

/* === 語言切換 === */
.lang-switch{font-size:13px;color:var(--gray);white-space:nowrap;margin-left:16px;padding-left:16px;border-left:1px solid var(--line)}
.lang-switch a{color:var(--gray);transition:color .2s;margin:0 4px}
.lang-switch a:hover{color:var(--orange)}

/* === RWD === */
@media(max-width:980px){
  .hero-content{grid-template-columns:1fr;gap:48px}
  .hero-card{aspect-ratio:5/4;max-width:480px;margin:0 auto;transform:none}
  .hero-card:hover{transform:translateY(-4px)}
}
@media(max-width:880px){
  section{padding:72px 0}
  .hero{padding:120px 0 60px}
  .hero h1{font-size:40px}
  .hero .lead{font-size:16.5px}
  .hero-featured .big{font-size:52px}
  .hero-stats .stat{min-width:140px;flex:1 1 40%}
  .sec-head h2,.about-block h2,.split-text h2,.smilegrap-text h3{font-size:30px}
  .cta-band h2{font-size:28px}
  .cta-band{padding:56px 28px}
  .foot-grid{grid-template-columns:1fr 1fr;gap:28px}
  .nav-links{display:none}
  .feat-grid,.smilegrap-bullets{grid-template-columns:1fr}
  .lang-switch{margin-left:auto;border-left:0;padding-left:0}
}