/* Isfinna 官網樣式 — 暖白底、墨黑字、藍色切口 */
:root {
  --paper: #FFFCF7;
  --paper-deep: #F7F1E6;
  --ink: #1D2223;
  --ink-soft: #4A5152;
  --ink-mute: #7C8384;
  --line: rgba(29, 34, 35, 0.14);
  --blue: #0084FE;            /* 品牌藍：Logo 切口、底線、裝飾，不放文字 */
  --blue-text: #006BD0;       /* 文字藍：按鈕底、藍字連結（對比 5.2:1） */
  --blue-text-hover: #0059AE;
  --gold: #FAC33C;
  --pink: #EC5F9C;

  --serif: "Newsreader", "Noto Serif TC", "Songti TC", serif;
  --sans: "Figtree", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;

  --gutter: clamp(16px, 5.2vw, 82px);
  --max: 1440px;
  --section: clamp(4.5rem, 3rem + 6vw, 9rem);

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 120px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }

.skip {
  position: absolute; left: -999px; top: 8px;
  background: var(--ink); color: var(--paper); padding: .6rem 1rem; z-index: 50;
}
.skip:focus { left: 8px; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }

/* 小標：寬字距大寫 */
.eyebrow {
  font-family: var(--sans);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .42em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 0;
}
.eyebrow--mute { color: var(--ink-mute); letter-spacing: .32em; }
.eyebrow--mute b { color: var(--ink); font-weight: 500; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s;
}
.site-header.is-stuck { border-bottom-color: var(--line); }
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: clamp(72px, 8vw, 104px);
}
.brand { display: block; line-height: 0; }
.brand img { width: clamp(132px, 13vw, 194px); height: auto; }

.nav { display: flex; align-items: center; gap: clamp(1.2rem, 2.2vw, 2rem); font-size: .95rem; }
.nav a { text-decoration: none; position: relative; }
.nav__links a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -4px; height: 1.5px;
  background: var(--blue); transform: scaleX(0); transform-origin: left;
  transition: transform .35s var(--ease);
}
.nav__links a:hover::after, .nav__links a[aria-current="page"]::after { transform: scaleX(1); }
.nav__links { display: flex; gap: clamp(1.2rem, 2.2vw, 2rem); }
.lang {
  display: flex; gap: .45rem; align-items: center;
  padding-left: clamp(1rem, 2vw, 1.6rem); border-left: 1px solid var(--line);
  font-size: .85rem; letter-spacing: .06em;
}
.lang a { color: var(--ink-soft); }
.lang a[aria-current="true"] { color: var(--blue-text); font-weight: 600; }
.lang span { color: var(--ink-mute); }

.btn {
  display: inline-flex; align-items: center; gap: .9rem;
  padding: 1.05rem 1.9rem;
  font: 500 .98rem/1 var(--sans);
  text-decoration: none; border: 0; cursor: pointer;
  transition: background .25s, transform .25s var(--ease), box-shadow .25s;
}
.btn--blue { background: var(--blue-text); color: #fff; }
.btn--blue:hover { background: var(--blue-text-hover); }
.btn svg { transition: transform .3s var(--ease); }
.btn:hover svg { transform: translateX(4px); }
.btn--sm { padding: .95rem 1.6rem; font-size: .92rem; }

.link-line {
  font-weight: 500; text-decoration: none; padding-bottom: .3rem;
  border-bottom: 1.5px solid var(--ink);
  transition: color .2s, border-color .2s;
}
.link-line:hover { color: var(--blue-text); border-color: var(--blue-text); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; }
.hero .wrap {
  position: relative; z-index: 2;
  min-height: clamp(560px, 50vw, 720px);
  display: flex; flex-direction: column; justify-content: center;
  padding-top: clamp(2.5rem, 4vw, 4rem); padding-bottom: clamp(3rem, 5vw, 5rem);
}
.hero__media {
  position: absolute; z-index: 1; top: 0; right: 0; bottom: 0;
  width: min(62vw, 1000px);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, #000 34%);
  mask-image: linear-gradient(to right, transparent 0%, #000 34%);
}
.hero__media img { width: 100%; height: 100%; object-fit: cover; object-position: 30% 50%; }
.hero__copy { max-width: 36rem; }
.hero h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(3.4rem, 1.6rem + 7.4vw, 8.6rem);
  line-height: .9;
  letter-spacing: -.035em;
  margin: 1.6rem 0 2rem;
  font-variation-settings: "opsz" 72;
}
.hero h1 em { font-style: italic; font-weight: 500; letter-spacing: -.04em; }
.hero h1 .zh {
  display: block; margin-top: 1.4rem;
  font-family: "Noto Serif TC", var(--serif);
  font-size: .3em; font-weight: 500; letter-spacing: .12em; line-height: 1.4;
}
.hero__lede { font-size: clamp(1.1rem, 1rem + .5vw, 1.4rem); line-height: 1.6; color: var(--ink); margin: 0 0 2.6rem; letter-spacing: .01em; }
.hero__actions { display: flex; align-items: center; gap: 2.4rem; flex-wrap: wrap; }

/* 首頁精簡版 hero：高度與字級收斂，第一屏就看得到下一段 */
.hero--compact .wrap { min-height: clamp(460px, 40vw, 580px); padding-bottom: clamp(2.5rem, 4vw, 3.5rem); }
.hero--compact .hero__copy { max-width: 40rem; }
.hero--compact h1 { font-size: clamp(3rem, 1.4rem + 5.4vw, 6.4rem); line-height: .95; margin: 0 0 1.6rem; }
.hero--compact h1 .zh { font-size: .42em; letter-spacing: .08em; margin-top: 1.2rem; }
.hero--compact .hero__lede { font-size: clamp(1rem, .95rem + .3vw, 1.15rem); line-height: 1.85; color: var(--ink-soft); max-width: 34rem; margin-bottom: 2rem; }

/* 進場動畫 */
.rise { opacity: 0; transform: translateY(18px); animation: rise 1s var(--ease) forwards; }
.rise:nth-child(2) { animation-delay: .08s; }
.rise:nth-child(3) { animation-delay: .18s; }
.rise:nth-child(4) { animation-delay: .28s; }
.hero__media { animation: glow 1.8s var(--ease) both; }
@keyframes rise { to { opacity: 1; transform: none; } }
@keyframes glow { from { opacity: 0; transform: scale(1.04); } to { opacity: 1; transform: none; } }

/* ---------- 區塊共用 ---------- */
.section { padding: var(--section) 0; }
.section--tight { padding: clamp(3.5rem, 2.5rem + 3vw, 5.5rem) 0; }
.section--line { padding-top: 0; }
.section--line .wrap { border-top: 1px solid var(--line); padding-top: clamp(3rem, 2rem + 3vw, 5rem); }
.section-head {
  display: grid; grid-template-columns: 1fr minmax(0, 24rem); gap: 1.5rem 4rem; align-items: end;
  margin-bottom: clamp(2rem, 3vw, 3rem);
}
.section-head h2, .display {
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(2.2rem, 1.4rem + 3vw, 4rem);
  line-height: 1.04; letter-spacing: -.028em; margin: .9rem 0 0;
}
.section-head p { margin: 0; color: var(--ink-soft); font-size: 1.02rem; line-height: 1.7; }
.h2-zh {
  display: block; margin-top: .5rem;
  font-family: "Noto Serif TC", var(--serif); font-size: .5em; letter-spacing: .06em;
}
.section-title {
  font-family: "Noto Serif TC", var(--serif); font-weight: 500;
  font-size: clamp(1.9rem, 1.3rem + 2.4vw, 3.2rem); line-height: 1.25; letter-spacing: .02em;
  margin: .9rem 0 .7rem;
}
.section-title:lang(en) { font-family: var(--serif); letter-spacing: -.025em; line-height: 1.1; }
.section-lede { max-width: 44rem; margin: 0 0 clamp(2rem, 3vw, 3rem); color: var(--ink-soft); }

/* ---------- 精選 Demo ---------- */
.demos { display: grid; grid-template-columns: 1fr 1fr; }
.demo { padding: 0 clamp(1.2rem, 3vw, 3rem); display: flex; flex-direction: column; }
.demo:first-child { padding-left: 0; }
.demo + .demo { border-left: 1px solid var(--line); padding-right: 0; }
.demo h3 {
  font-family: "Noto Serif TC", var(--serif); font-weight: 500;
  font-size: clamp(1.45rem, 1.1rem + 1vw, 1.9rem); line-height: 1.3; margin: .6rem 0 .3rem;
}
.demo h3:lang(en), .demo h3 span { font-family: var(--serif); }
.demo__sum { margin: 0 0 1.3rem; color: var(--ink); }
.demo__shot {
  display: block; overflow: hidden; border: 1px solid var(--line); background: #fff;
  box-shadow: 0 18px 40px -28px rgba(29, 34, 35, .45);
  transition: transform .5s var(--ease), box-shadow .5s var(--ease);
}
.demo__shot img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; object-position: top left; }
.demo__shot:hover { transform: translateY(-4px); box-shadow: 0 26px 50px -26px rgba(0, 132, 254, .45); }
.demo__desc { margin: 1.2rem 0 .9rem; color: var(--ink-soft); font-size: .96rem; }
.tags {
  list-style: none; margin: 0 0 1.3rem; padding: 0;
  display: flex; flex-wrap: wrap; gap: .3rem .9rem;
  font-size: .82rem; color: var(--ink-mute); letter-spacing: .06em;
}
.tags li + li::before { content: "/"; margin-right: .9rem; color: var(--line); }
.demo__cta {
  margin-top: auto; align-self: flex-start;
  display: inline-flex; align-items: center; gap: .8rem;
  color: var(--blue-text); font-weight: 600; text-decoration: none;
}
.demo__cta svg { transition: transform .3s var(--ease); }
.demo__cta:hover svg { transform: translateX(4px); }
.note { margin: clamp(1.8rem, 3vw, 2.6rem) 0 0; text-align: center; font-size: .8rem; color: var(--ink-mute); }

/* ---------- 顧問服務三欄 ---------- */
.practice { display: grid; grid-template-columns: repeat(3, 1fr); }
.practice article {
  padding: 0 clamp(1.2rem, 2.5vw, 2.4rem);
  border-left: 1px solid var(--line);
}
.practice article:first-child { padding-left: 0; border-left: 0; }
.practice article:last-child { padding-right: 0; }
.practice .num {
  display: block; font-size: .7rem; letter-spacing: .2em; color: var(--ink-mute);
  padding-bottom: .7rem; border-bottom: 1px solid var(--line); margin-bottom: 1.1rem;
  position: relative;
}
.practice .num::after {
  content: ""; position: absolute; left: 0; bottom: -1px; height: 2px; width: 0;
  background: var(--c, var(--blue)); transition: width .6s var(--ease);
}
.practice article:hover .num::after { width: 100%; }
.practice article:nth-child(2) { --c: var(--gold); }
.practice article:nth-child(3) { --c: var(--pink); }
.practice h3 {
  font-family: "Noto Serif TC", var(--serif); font-weight: 500;
  font-size: clamp(1.25rem, 1.05rem + .6vw, 1.5rem); line-height: 1.35; margin: 0 0 .6rem;
}
.practice h3:lang(en) { font-family: var(--serif); font-size: clamp(1.45rem, 1.2rem + .7vw, 1.8rem); }
.practice p { color: var(--ink-soft); margin: 0; font-size: .98rem; }

/* ---------- 合作邀請條 ---------- */
.cta-strip { position: relative; overflow: hidden; background: var(--paper-deep); }
.cta-strip::before {
  /* 主視覺的光，淡淡鋪在右側 */
  content: ""; position: absolute; inset: 0;
  background: url("/assets/hero-sm.webp") right center / 46% auto no-repeat;
  opacity: .35;
  -webkit-mask-image: linear-gradient(to right, transparent 45%, #000);
  mask-image: linear-gradient(to right, transparent 45%, #000);
}
.cta-strip .wrap {
  position: relative; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 1.5rem 3rem; padding-top: clamp(2.2rem, 3vw, 3rem); padding-bottom: clamp(2.2rem, 3vw, 3rem);
}
.cta-strip h2 {
  margin: 0; font-family: "Noto Serif TC", var(--serif); font-weight: 500;
  font-size: clamp(1.6rem, 1.2rem + 1.4vw, 2.3rem); letter-spacing: .04em;
}
.cta-strip h2:lang(en) { font-family: var(--serif); letter-spacing: -.01em; }
.cta-strip p { margin: .4rem 0 0; color: var(--ink-soft); }

/* ---------- Footer ---------- */
.site-footer { padding: 3.2rem 0 2.6rem; font-size: .88rem; color: var(--ink-soft); }
.site-footer .wrap { display: grid; grid-template-columns: auto 1fr auto; gap: 2rem 4rem; align-items: start; }
.site-footer img { width: 132px; }
.site-footer p { margin: 0; line-height: 1.8; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 1.6rem; }
.site-footer nav a { text-decoration: none; }
.site-footer nav a:hover { color: var(--blue-text); }
.site-footer .legal { grid-column: 1 / -1; padding-top: 1.6rem; border-top: 1px solid var(--line); font-size: .78rem; color: var(--ink-mute); letter-spacing: .04em; }

/* ---------- About 頁 ---------- */
.page-hero { padding: clamp(3.5rem, 7vw, 7rem) 0 clamp(2.5rem, 4vw, 4rem); position: relative; overflow: hidden; }
.page-hero .hero__media { width: min(44vw, 700px); opacity: .95; }
.page-hero h1 {
  font-family: var(--serif); font-weight: 500; font-size: clamp(2.8rem, 1.6rem + 5vw, 6rem);
  line-height: 1; letter-spacing: -.03em; margin: 1.4rem 0 1.6rem; position: relative; z-index: 2;
}
.page-hero .lede { position: relative; z-index: 2; max-width: 34rem; font-size: 1.2rem; margin: 0; }
.story { display: grid; grid-template-columns: minmax(0, 15rem) minmax(0, 44rem); gap: 2rem clamp(2rem, 6vw, 7rem); }
.story + .story { margin-top: clamp(3rem, 5vw, 5rem); padding-top: clamp(3rem, 5vw, 5rem); border-top: 1px solid var(--line); }
.story h2 { font-family: var(--serif); font-weight: 500; font-size: 1.7rem; line-height: 1.25; margin: 0; letter-spacing: -.01em; }
.story h2 small { display: block; margin-bottom: .8rem; font: 500 .7rem/1 var(--sans); letter-spacing: .36em; text-transform: uppercase; color: var(--ink-mute); }
.story p { margin: 0 0 1.2rem; color: var(--ink-soft); font-size: 1.08rem; line-height: 1.9; }
.story ol { margin: 0 0 1.2rem; padding-left: 1.3rem; color: var(--ink-soft); font-size: 1.05rem; line-height: 1.9; }
.story ol b { color: var(--ink); font-weight: 600; }
.quote {
  margin: clamp(3rem, 5vw, 5rem) 0 0; padding-top: 2rem; border-top: 1px solid var(--line);
  font-family: "Noto Serif TC", var(--serif); font-weight: 500;
  font-size: clamp(1.45rem, 1.1rem + 1.4vw, 2.3rem); line-height: 1.55; letter-spacing: .02em;
}
.quote cite { display: block; margin-top: 1rem; font: 500 .75rem/1 var(--sans); letter-spacing: .38em; font-style: normal; text-transform: uppercase; color: var(--ink-mute); }
.palette { display: grid; grid-template-columns: repeat(6, 1fr); gap: .8rem; margin-top: .6rem; }
.palette div { font-size: .78rem; color: var(--ink-soft); }
.palette i { display: block; aspect-ratio: 1.3; margin-bottom: .6rem; background: var(--sw); border: 1px solid var(--line); }
.palette b { display: block; color: var(--ink); font-weight: 600; }

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  html { scroll-padding-top: 150px; }
  /* 窄螢幕：主選單換到第二列，不藏起來 */
  .site-header .wrap { flex-wrap: wrap; height: auto; padding-top: .9rem; column-gap: 1.2rem; }
  .nav { display: contents; }
  .lang { margin-left: auto; }
  .nav__links {
    order: 5; width: 100%; margin-top: .8rem; padding: .75rem 0 .8rem;
    border-top: 1px solid var(--line); font-size: .9rem; gap: 1.6rem;
    overflow-x: auto; scrollbar-width: none; white-space: nowrap;
  }
}
@media (max-width: 860px) {
  .hero .wrap { min-height: 0; padding-top: 0; }
  .hero__media {
    position: relative; width: calc(100% + var(--gutter)); margin-left: auto; height: 56vw; max-height: 380px;
    -webkit-mask-image: linear-gradient(to bottom, #000 70%, transparent);
    mask-image: linear-gradient(to bottom, #000 70%, transparent);
  }
  .hero { display: flex; flex-direction: column; }
  .page-hero .hero__media { display: none; }
  .section-head { grid-template-columns: 1fr; }
  .demos { grid-template-columns: 1fr; gap: 3rem; }
  .demo, .demo + .demo { padding: 0; border-left: 0; }
  .practice { grid-template-columns: 1fr; gap: 2.2rem; }
  .practice article { padding: 0; border-left: 0; }
  .cta-strip::before { background-size: cover; opacity: .18; }
  .site-footer .wrap { grid-template-columns: 1fr; }
  .story { grid-template-columns: 1fr; }
  .palette { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 560px) {
  /* 手機：header 壓扁、按鈕加大，跳轉錨點不被 header 蓋住 */
  html { scroll-padding-top: 108px; }
  .site-header .wrap { padding-top: .6rem; }
  .brand img { width: 112px; }
  .nav .btn { display: none; }
  .lang { border-left: 0; padding-left: 0; }
  .lang a { padding: .5rem .2rem; }
  .nav__links { margin-top: .5rem; padding: .15rem 0; gap: 0; justify-content: space-between; }
  .nav__links a { padding: .6rem 0; }
  .nav__links a::after { bottom: 4px; }
  .hero__media { height: 62vw; }
  .hero--compact h1 { font-size: clamp(2.7rem, 11vw, 3.4rem); }
  .hero__actions { gap: 1.2rem; }
  .hero__actions .btn { width: 100%; justify-content: center; }
  .hero__actions .link-line { margin: 0 auto; }
  .demo__cta, .cta-strip .btn { padding: .4rem 0; }
  .cta-strip .btn { width: 100%; justify-content: center; padding: 1.05rem 1.9rem; }
  .tags { gap: .2rem .7rem; }
  .tags li + li::before { margin-right: .7rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .rise { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

/* 中文不做假斜體；英文標語保留斜體 */
:lang(zh) em, em:lang(zh) { font-style: normal; }
em:lang(en) { font-style: italic; }