/* ===========================================================
   徐芷嫺 Portfolio — Design tokens & base styles
   Color / type / spacing values come from the approved design spec
   (see the "DESIGN SPEC" panel in the original Claude Design file).
   =========================================================== */

:root {
  --color-accent: #E4D6C3;
  --color-text: #3B2417;
  --color-text-secondary: #79695A;
  --color-text-faint: #7C6C5A;
  --color-bg: #FAF3EA;
  --color-bg-alt: #F3E8D8;
  --color-border: #D8C4A8;
  --color-border-strong: #C9AD87;
  --color-tag-bg: #EFE1CC;
  --color-tag-text: #6B4E36;

  --font-serif: 'Noto Serif TC', serif;
  --font-sans: 'Noto Sans TC', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --page-max: 1200px;
  --bar-max: 1600px;
  --pad-desktop: 40px;
  --pad-mobile: 24px;
  --sec-pad-desktop: 120px;
  --sec-pad-mobile: 72px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  font-family: var(--font-sans);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-text);
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

::selection {
  background: var(--color-border);
  color: var(--color-text);
}

/* Anchors land below the sticky header instead of right under it */
section[id], main[id] {
  scroll-margin-top: 90px;
}

.inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--pad-mobile);
}
@media (min-width: 720px) {
  .inner { padding: 0 var(--pad-desktop); }
}

.sec {
  padding: var(--sec-pad-mobile) 0;
  background: var(--color-bg);
}
.sec-alt {
  padding: var(--sec-pad-mobile) 0;
  background: var(--color-bg-alt);
}
@media (min-width: 720px) {
  .sec, .sec-alt { padding: var(--sec-pad-desktop) 0; }
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--color-text-faint);
  margin: 0 0 12px;
}

h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

h1 {
  font-size: 32px;
  line-height: 1.45;
  letter-spacing: .02em;
}
@media (min-width: 720px) {
  h1 { font-size: 48px; }
}

h2 {
  font-size: 26px;
  line-height: 1.4;
  letter-spacing: .02em;
}
@media (min-width: 720px) {
  h2 { font-size: 32px; }
}

/* ===================== HEADER / NAV ===================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-accent);
  border-bottom: 1px solid var(--color-border-strong);
}

.nav-inner {
  max-width: var(--bar-max);
  margin: 0 auto;
  padding: 16px var(--pad-mobile);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
@media (min-width: 720px) {
  .nav-inner { padding: 20px var(--pad-desktop); }
}

.logo {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-height: 24px;
  color: var(--color-text);
}
.logo-zh {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .02em;
}
.logo-en {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--color-tag-text);
}

.nav-links {
  display: none;
  align-items: center;
  gap: 30px;
}
@media (min-width: 720px) {
  .nav-links { display: flex; }
}

.nav-link {
  padding: 8px 4px;
  min-height: 24px;
  font-size: 14px;
  color: var(--color-text);
  border-bottom: 1px solid transparent;
  transition: color .2s, border-color .2s;
}
.nav-link:hover {
  color: #4A3B32;
  border-bottom-color: var(--color-text);
}

.nav-contact {
  padding: 8px 14px;
  min-height: 24px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-text-secondary);
  border-radius: 2px;
  transition: background-color .3s, color .3s;
}
.nav-contact:hover {
  background: var(--color-text-secondary);
  color: var(--color-bg);
}

.burger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 32px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid #C2A594;
  border-radius: 2px;
  cursor: pointer;
}
@media (min-width: 720px) {
  .burger { display: none; }
}
.burger span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--color-text);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 4px var(--pad-mobile) 20px;
  border-top: 1px solid var(--color-border-strong);
  background: var(--color-accent);
}
.mobile-menu.is-open {
  display: flex;
}
@media (min-width: 720px) {
  .mobile-menu { display: none !important; }
}
.mobile-menu a {
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border-strong);
  color: var(--color-text);
  font-size: 15px;
}
.mobile-menu a:last-child {
  border-bottom: none;
}

/* ===================== BUTTONS ===================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  font-size: 14px;
  letter-spacing: .05em;
  border-radius: 2px;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: background-color .3s, color .3s, border-color .3s;
}
.btn-primary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid transparent;
}
.btn-primary:hover {
  background: var(--color-text-secondary);
  color: var(--color-bg);
}
.btn-outline-light {
  border: 1px solid rgba(255,255,255,.5);
  color: var(--color-bg);
}
.btn-outline-light:hover {
  border-color: var(--color-bg);
  background: rgba(255,255,255,.1);
}
.btn-outline {
  border: 1px solid var(--color-text-secondary);
  color: var(--color-text-secondary);
  background: transparent;
}
.btn-outline:hover {
  background: var(--color-text-secondary);
  color: var(--color-bg);
}

/* ===================== HERO ===================== */

.hero {
  position: relative;
  overflow: hidden;
  min-height: 640px;
  min-height: 100svh;
  display: flex;
  align-items: center;
  background: var(--color-bg) url("../assets/images/hero/hero-bg.png") center / cover no-repeat;
  border-bottom: 1px solid var(--color-border);
}
@media (min-width: 720px) {
  .hero { min-height: 860px; min-height: 100svh; }
}
@media (max-width: 719px) {
  /* hero-bg.png's line-art lives in four corner clusters. On a narrow
     viewport, swap the single cover image for four corner crops, each
     pinned to its own corner and sized off viewport width (not the
     hero's height) with a clamp so it scales gently as the window
     resizes but never balloons or shrinks to nothing. Each corner
     stays a consistent, undistorted size and only the blank middle
     grows or shrinks to fill the leftover space — instead of the
     whole image being uniformly shrunk or cropped. */
  .hero {
    background-image:
      url("../assets/images/hero/hero-corner-tl.png"),
      url("../assets/images/hero/hero-corner-tr.png"),
      url("../assets/images/hero/hero-corner-bl.png"),
      url("../assets/images/hero/hero-corner-br.png");
    background-position: top left, top right, bottom left, bottom right;
    background-size:
      clamp(140px, 34vw, 300px) auto,
      clamp(140px, 34vw, 300px) auto,
      clamp(140px, 34vw, 300px) auto,
      clamp(140px, 34vw, 300px) auto;
    background-repeat: no-repeat, no-repeat, no-repeat, no-repeat;
  }
}
.hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--pad-mobile);
}
@media (min-width: 720px) {
  .hero-inner { padding: 0 var(--pad-desktop); }
}
.hero-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--color-text-secondary);
  margin: 0 0 26px;
}
.hero-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 32px;
  line-height: 1.45;
  letter-spacing: .02em;
  color: var(--color-text);
  max-width: 820px;
}
@media (min-width: 720px) {
  .hero-title { font-size: 48px; }
}
.hero-sub {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--color-text-secondary);
  letter-spacing: .02em;
}
@media (min-width: 720px) {
  .hero-sub { font-size: 16px; letter-spacing: .03em; }
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 40px;
}
.hero-cta .btn-primary {
  background: var(--color-text-secondary);
  color: var(--color-bg);
}
.hero-cta .btn-primary:hover {
  background: var(--color-text);
  color: var(--color-bg);
}
.hero-cta .btn-outline-light {
  border-color: var(--color-text-secondary);
  color: var(--color-text);
}
.hero-cta .btn-outline-light:hover {
  border-color: var(--color-text);
  background: var(--color-bg-alt);
}

/* ===================== ABOUT ===================== */

.about-cols {
  max-width: 800px;
  margin-top: 36px;
}
@media (min-width: 720px) {
  .about-cols {
    margin-top: 52px;
    max-width: none;
    display: grid;
    grid-template-columns: minmax(200px, clamp(220px, 34vw, 400px)) 1fr;
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }
  .portrait {
    margin-bottom: 0;
  }
}

.portrait {
  position: relative;
  width: 400px;
  max-width: 100%;
  aspect-ratio: 4/5;
  border-radius: 8px;
  border: 1px solid var(--color-border-strong);
  overflow: hidden;
  margin-bottom: 32px;
}
.portrait img {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.portrait-placeholder {
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(135deg, #EFE2D0 0 8px, #F8F0E5 8px 16px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.portrait-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--color-text-faint);
  letter-spacing: .08em;
}
.portrait-size {
  font-family: var(--font-mono);
  font-size: 9.5px;
  color: #AFA08A;
}

.about-body {
  margin: 0;
  font-size: 17px;
  line-height: 2.1;
  color: var(--color-text);
  letter-spacing: .03em;
}

.info-block {
  margin-top: 40px;
  padding-top: 26px;
  border-top: 1px solid var(--color-border-strong);
}
.info-block + .info-block {
  margin-top: 34px;
}
.info-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--color-text-faint);
  margin: 0 0 16px;
}
.info-title {
  font-size: 15.5px;
  color: var(--color-text);
  letter-spacing: .02em;
}
.info-meta {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--color-text-faint);
}
.info-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
}
.info-note {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--color-text-secondary);
  padding-left: 14px;
  border-left: 1px solid var(--color-border);
}

/* Skills block: standalone, below the photo/bio row */
.skills-block {
  max-width: 800px;
  margin: 56px auto 0;
  padding-top: 40px;
  border-top: 1px solid var(--color-border);
}
@media (min-width: 720px) {
  .skills-block { max-width: none; }
}
.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  margin-top: 22px;
}
@media (min-width: 720px) {
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
}
.skill-card {
  background: var(--color-bg);
  padding: 24px 26px;
}
.skill-head {
  display: flex;
  align-items: center;
  gap: 12px;
}
.skill-head h3 {
  font-size: 16px;
}
.skill-list {
  margin: 14px 0 0;
  padding: 0 0 0 30px;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.skill-list li {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* Experience blocks (Honors / Projects) */
.exp-wrap {
  max-width: 800px;
  margin: 64px auto 0;
  padding-top: 48px;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 48px;
}
@media (min-width: 720px) {
  .exp-wrap {
    max-width: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px 64px;
    align-items: start;
  }
}
.exp-block {
  display: flex;
  flex-wrap: wrap;
  gap: 36px;
}
.exp-title {
  flex: 0 0 auto;
  min-width: 160px;
  font-size: 17px;
}
.exp-entries {
  flex: 1 1 420px;
  min-width: 250px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.resume-cta {
  max-width: 800px;
  margin: 44px auto 0;
}
@media (min-width: 720px) {
  .resume-cta {
    max-width: none;
    display: flex;
    justify-content: center;
  }
}

/* ===================== WORK CARDS ===================== */

.work-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}
@media (min-width: 640px) {
  .work-grid { grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr)); }
}

.work-card {
  display: block;
  color: inherit;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow .35s ease, border-color .35s ease, transform .35s ease;
}
.work-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 24px 48px -24px rgba(26,26,24,.34);
  transform: translateY(-3px);
}

.work-cover {
  position: relative;
  aspect-ratio: 16/10;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}
.work-cover-placeholder,
.work-cover img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.work-cover-placeholder {
  background-image: repeating-linear-gradient(135deg, #EFE2D0 0 8px, #F8F0E5 8px 16px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: transform .55s cubic-bezier(.2,.8,.2,1);
}
.work-card:hover .work-cover-placeholder {
  transform: scale(1.06);
}
.work-cover img {
  z-index: 1;
  object-fit: cover;
  object-position: center;
  transition: transform .55s cubic-bezier(.2,.8,.2,1);
}
.work-card:hover .work-cover img {
  transform: scale(1.06);
}
.cover-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-faint);
  letter-spacing: .08em;
}
.cover-size {
  font-family: var(--font-mono);
  font-size: 10px;
  color: #AFA08A;
}

.work-body {
  padding: 26px 26px 30px;
}
.work-no {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--color-text-faint);
  letter-spacing: .14em;
}
.work-title {
  margin: 12px 0 0;
  font-size: 20px;
  line-height: 1.5;
  letter-spacing: .01em;
}
.work-desc {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-text-secondary);
}
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}
.tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--color-tag-text);
  background: var(--color-tag-bg);
  padding: 5px 10px;
  border-radius: 2px;
  letter-spacing: .04em;
}

/* Full works page — grid uses 3 cols on desktop, has category + link row */
.works-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}
@media (min-width: 640px) {
  .works-grid { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
}
.works-grid .work-card {
  display: flex;
  flex-direction: column;
}
.work-card-link {
  display: flex;
  flex-direction: column;
  flex: 1;
  color: inherit;
}
.works-grid .work-body {
  padding: 24px 24px 28px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.works-grid .work-cat {
  font-family: var(--font-mono);
  font-size: 10px;
  color: #8A7A6E;
  letter-spacing: .12em;
}
.works-grid .work-title {
  font-size: 18px;
  line-height: 1.55;
}
.works-grid .work-desc {
  margin: 12px 0 20px;
  font-size: 14.5px;
}
.works-grid .tag-row {
  margin-top: auto;
}
.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
  padding: 18px 24px 24px;
  border-top: 1px solid var(--color-border);
}
.link-pill {
  font-size: 12px;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-text-secondary);
  padding: 6px 12px;
  border-radius: 2px;
  transition: background-color .25s, color .25s, border-color .25s;
}
.link-pill:hover {
  background: var(--color-text-secondary);
  border-color: var(--color-text-secondary);
  color: var(--color-bg);
}

/* Category filter (All Works page) */
.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 44px 0 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}
.filter-btn {
  padding: 10px 18px;
  min-height: 24px;
  border: 1px solid var(--color-border-strong);
  background: transparent;
  color: var(--color-text-secondary);
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: .03em;
  border-radius: 2px;
  cursor: pointer;
  transition: background-color .2s, border-color .2s, color .2s;
}
.filter-btn:hover {
  border-color: var(--color-text-secondary);
  color: var(--color-text-secondary);
}
.filter-btn.is-active {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-text);
}

.works-intro {
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 2;
  color: var(--color-text-secondary);
  max-width: 560px;
}
@media (min-width: 720px) {
  .works-intro { max-width: none; }
}

/* ===================== HOW I WORK ===================== */

.steps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-top: 52px;
}
@media (min-width: 720px) {
  .steps-grid { grid-template-columns: repeat(3, 1fr); }
}
.step {
  border-top: 1px solid var(--color-border-strong);
  padding-top: 24px;
}
.step-no {
  font-family: var(--font-mono);
  font-size: 13px;
  color: #8A7A6E;
  letter-spacing: .12em;
}
.step h3 {
  margin-top: 18px;
  font-size: 21px;
}
.step p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.95;
  color: var(--color-text-secondary);
}

/* ===================== CONTACT ===================== */

.contact-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 56px;
  align-items: flex-start;
}
.contact-copy {
  flex: 1 1 380px;
  min-width: 260px;
}
.contact-copy p {
  margin: 22px 0 0;
  font-size: 16px;
  line-height: 2;
  color: var(--color-text-secondary);
  max-width: 420px;
}
.contact-links {
  flex: 1 1 320px;
  min-width: 250px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.contact-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  color: var(--color-text);
  transition: box-shadow .3s ease, border-color .3s ease, transform .3s ease;
}
.contact-card:hover {
  border-color: #4A3B32;
  box-shadow: 0 16px 32px -20px rgba(26,26,24,.3);
  transform: translateY(-3px);
}
.contact-card-body {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.contact-card-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--color-text-faint);
}
.contact-card-value {
  font-size: 15px;
}

/* ===================== FOOTER ===================== */

.site-footer {
  background: var(--color-accent);
  color: var(--color-tag-text);
}
.foot-inner {
  max-width: var(--bar-max);
  margin: 0 auto;
  padding: 40px var(--pad-mobile);
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
}
@media (min-width: 720px) {
  .foot-inner { padding: 48px var(--pad-desktop); }
}
.foot-name {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.foot-name-zh {
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--color-text);
}
.foot-copyright {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
}
.top-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 38px;
  padding: 0 16px;
  border: 1px solid var(--color-border-strong);
  border-radius: 2px;
  color: var(--color-tag-text);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  transition: border-color .2s, color .2s;
}
.top-link:hover {
  border-color: var(--color-text-secondary);
  color: var(--color-text-secondary);
}