/* =========================================================
   Zizheng Zhao Portfolio Website
   Replace image placeholders by searching: REPLACE IMAGE
   ========================================================= */

:root {
  --bg: #fbf8f5;
  --surface: #ffffff;
  --surface-2: #efebe7;
  --text: #171717;
  --muted: #686868;
  --line: #d8d2cc;
  --blue: #0047ff;
  --green: #00ff66;
  --black: #0f0f0f;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hanken Grotesk", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  background: rgba(251, 248, 245, 0.86);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 22px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  font-family: "Epilogue", sans-serif;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.04em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-family: "Geist", sans-serif;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.nav-links a {
  color: var(--muted);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--blue);
}

.availability {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: "Geist", sans-serif;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--blue);
}

.availability-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--blue);
}

main {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 32px;
}

.section {
  padding: 120px 0;
  border-bottom: 1px solid var(--line);
}

.section-sm {
  padding: 72px 0;
}

.hero {
  min-height: calc(100vh - 80px);
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 42px;
  align-items: center;
  padding: 72px 0;
}

.eyebrow {
  font-family: "Geist", sans-serif;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  color: var(--blue);
  margin: 0 0 18px;
}

h1, h2, h3, h4 {
  font-family: "Epilogue", sans-serif;
  margin: 0;
  letter-spacing: -0.045em;
}

h1 {
  font-size: clamp(52px, 8vw, 112px);
  line-height: 0.96;
}

h2 {
  font-size: clamp(38px, 5vw, 72px);
  line-height: 1;
}

h3 {
  font-size: clamp(26px, 3vw, 42px);
  line-height: 1.08;
}

h4 {
  font-size: 22px;
  line-height: 1.2;
}

.lead {
  font-size: clamp(20px, 2vw, 26px);
  line-height: 1.35;
  color: var(--muted);
  max-width: 760px;
}

.body-text {
  font-size: 18px;
  line-height: 1.65;
  color: var(--muted);
}

.small {
  font-size: 15px;
  line-height: 1.55;
  color: var(--muted);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid var(--text);
  font-family: "Geist", sans-serif;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  transition: 180ms ease;
}

.btn.primary {
  background: var(--text);
  color: var(--bg);
}

.btn:hover {
  border-color: var(--blue);
  color: var(--blue);
  transform: translateY(-2px);
}

.btn.primary:hover {
  background: var(--blue);
  color: white;
}

.hero-montage {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  grid-template-rows: 1fr 1fr;
  gap: 16px;
  min-height: 620px;
}

.hero-montage .visual-card:first-child {
  grid-row: span 2;
}

.visual-card,
.image-placeholder {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(0,71,255,.08), rgba(255,255,255,0)),
    var(--surface-2);
  min-height: 260px;
}

.visual-card {
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.visual-card:hover .fake-screen,
.project-card:hover .image-placeholder,
.mockup:hover {
  transform: translateY(-4px);
}

.replace-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 10;
  background: var(--green);
  color: #001b09;
  font-family: "Geist", sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 7px 10px;
  border: 1px solid #001b09;
}

.placeholder-center {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 48px;
  color: #0a381a;
  font-family: "Geist", sans-serif;
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.9;
}

.fake-screen {
  position: relative;
  z-index: 1;
  background: var(--surface);
  border: 1px solid rgba(0,0,0,.1);
  box-shadow: 0 26px 60px rgba(0,0,0,.12);
  transition: 240ms ease;
}

.phone-row {
  display: flex;
  gap: 18px;
  align-items: flex-end;
  justify-content: center;
}

.phone {
  width: min(180px, 38vw);
  aspect-ratio: 9 / 18;
  border-radius: 28px;
  padding: 16px;
}

.phone.dark {
  background: var(--black);
  color: white;
}

.browser {
  width: 100%;
  aspect-ratio: 16/10;
  border-radius: 10px;
  padding: 18px;
}

.fake-ui-line {
  height: 10px;
  background: currentColor;
  opacity: .16;
  margin-bottom: 12px;
}

.fake-ui-box {
  background: currentColor;
  opacity: .11;
  border-radius: 10px;
}

.project-grid {
  display: grid;
  gap: 72px;
}

.project-card {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 36px;
  align-items: end;
}

.project-card.reverse {
  grid-template-columns: 0.9fr 1.1fr;
}

.project-card.reverse .project-info {
  order: -1;
}

.project-card .image-placeholder {
  aspect-ratio: 16 / 9;
  min-height: 420px;
  transition: 240ms ease;
}

.project-meta {
  font-family: "Geist", sans-serif;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  color: var(--blue);
  margin-bottom: 12px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.card {
  background: rgba(255,255,255,.55);
  border: 1px solid var(--line);
  padding: 28px;
  min-height: 210px;
}

.resume-card {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 32px;
}

.case-hero {
  padding: 88px 0 56px;
}

.case-title-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 42px;
  align-items: end;
  margin-bottom: 42px;
}

.case-info {
  border-top: 1px solid var(--line);
  padding-top: 18px;
  display: grid;
  gap: 18px;
}

.mockup {
  position: relative;
  min-height: 620px;
  border: 1px solid var(--line);
  background: var(--surface-2);
  overflow: hidden;
  transition: 240ms ease;
  display: grid;
  place-items: center;
}

.mockup.short {
  min-height: 360px;
}

.case-section {
  padding: 96px 0;
  border-top: 1px solid var(--line);
}

.case-two-col {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 56px;
}

.flow-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
  margin-top: 28px;
}

.flow-screen {
  aspect-ratio: 9/16;
  border: 1px solid var(--line);
  background: var(--surface);
  position: relative;
  display: grid;
  place-items: center;
  padding: 16px;
  text-align: center;
  font-family: "Geist", sans-serif;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
}

.contact-layout {
  min-height: calc(100vh - 80px);
  display: grid;
  grid-template-columns: 1fr 0.8fr;
  gap: 56px;
  align-items: center;
  padding: 88px 0;
}

.contact-list {
  border-top: 1px solid var(--line);
}

.contact-row {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  font-size: 20px;
}

.footer {
  border-top: 1px solid var(--line);
  margin-top: 80px;
}

.footer-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 36px 32px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 22px;
}

@media (max-width: 900px) {
  .nav-inner {
    padding: 18px 20px;
  }

  .nav-links {
    display: none;
  }

  main {
    padding: 0 20px;
  }

  .hero,
  .project-card,
  .project-card.reverse,
  .case-title-grid,
  .case-two-col,
  .grid-2,
  .grid-3,
  .grid-4,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-montage {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
    min-height: auto;
  }

  .hero-montage .visual-card:first-child {
    grid-row: auto;
  }

  .visual-card {
    min-height: 360px;
  }

  .project-card.reverse .project-info {
    order: initial;
  }

  .project-card .image-placeholder,
  .mockup {
    min-height: 360px;
  }

  .resume-card {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .flow-row {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    padding: 30px 20px;
  }
}


/* ===== Completed portfolio image + case study upgrades ===== */
.media-card, .image-placeholder.has-image, .mockup.has-image, .visual-card.has-image {
  padding: 0;
  background: #fff;
  overflow: hidden;
  border: 1px solid var(--line);
}
.media-card img, .image-placeholder.has-image img, .mockup.has-image img, .visual-card.has-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.mockup.has-image.contain img, .image-placeholder.has-image.contain img, .visual-card.has-image.contain img {
  object-fit: contain;
  background: #f7f3ef;
}
.hero-montage .visual-card.has-image { min-height: 300px; }
.hero-montage .visual-card:first-child.has-image { min-height: 620px; }
.image-caption {
  position: absolute;
  left: 18px;
  bottom: 18px;
  background: rgba(255,255,255,.88);
  border: 1px solid rgba(0,0,0,.08);
  padding: 10px 12px;
  font-family: Geist, sans-serif;
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.case-kicker {
  display: grid;
  grid-template-columns: repeat(6, minmax(0,1fr));
  gap: 10px;
  margin-top: 34px;
}
.workflow-step {
  background: rgba(255,255,255,.62);
  border: 1px solid var(--line);
  padding: 18px 16px;
  min-height: 132px;
}
.workflow-step .num {
  color: var(--blue);
  font-family: Geist, sans-serif;
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.workflow-step strong { font-family: Epilogue, sans-serif; font-size: 19px; letter-spacing: -.04em; }
.persona-card {
  display: grid;
  grid-template-columns: 270px 1fr;
  gap: 26px;
  padding: 24px;
  background: rgba(255,255,255,.62);
  border: 1px solid var(--line);
}
.persona-card img { width: 100%; aspect-ratio: 3/4; object-fit: cover; background: #ddd; }
.persona-meta { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 18px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.tag { border: 1px solid var(--line); padding: 8px 10px; border-radius: 99px; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .08em; font-family: Geist, sans-serif; }
.palette { display: grid; grid-template-columns: repeat(4,1fr); gap: 14px; margin-top: 24px; }
.swatch { min-height: 120px; border: 1px solid rgba(0,0,0,.12); padding: 14px; display:flex; align-items:flex-end; font-family:Geist,sans-serif; font-size:12px; letter-spacing:.08em; text-transform:uppercase; }
.solo-orange { --blue: #c76200; }
.anti-blue { --blue: #4078ff; }
.kokio-gold { --blue: #d99a00; }
.project-logo { font-family:Epilogue,sans-serif; font-size:26px; letter-spacing:-.04em; }
.footer-note { font-size: 12px; color: var(--muted); }
@media (max-width: 1000px) {
  .case-kicker { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .persona-card { grid-template-columns: 1fr; }
  .persona-meta { grid-template-columns: 1fr; }
}

/* =========================================================
   Responsive polish: desktop full screen, desktop half screen,
   iPad/tablet, and phone layouts
   ========================================================= */
html, body {
  width: 100%;
  overflow-x: hidden;
}

body {
  text-rendering: optimizeLegibility;
}

main,
.nav-inner,
.footer-inner {
  width: min(100%, 1440px);
}

.visual-card.has-image,
.image-placeholder.has-image,
.mockup.has-image {
  border-radius: 0;
}

.mockup.has-image img,
.image-placeholder.has-image img,
.visual-card.has-image img {
  object-position: center;
}

.mockup.has-image.contain img,
.image-placeholder.has-image.contain img,
.visual-card.has-image.contain img {
  padding: clamp(12px, 2vw, 28px);
}

.card,
.workflow-step,
.persona-card,
.contact-row,
.btn,
.mockup,
.image-placeholder,
.visual-card {
  border-radius: 0;
}

/* Large desktop / full screen */
@media (min-width: 1400px) {
  main {
    padding-inline: 40px;
  }

  .hero {
    gap: 56px;
  }

  .case-hero {
    padding-top: 96px;
  }

  .mockup {
    min-height: 660px;
  }
}

/* Laptop and desktop half-screen safety */
@media (max-width: 1180px) {
  main {
    padding-inline: 28px;
  }

  .nav-inner {
    padding: 20px 28px;
  }

  .brand {
    font-size: 24px;
    white-space: nowrap;
  }

  .nav-links {
    gap: 18px;
  }

  .availability {
    font-size: 11px;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding: 64px 0;
  }

  .hero-montage {
    min-height: auto;
    grid-template-columns: 1fr 1fr;
  }

  .hero-montage .visual-card:first-child {
    grid-column: 1 / -1;
    grid-row: auto;
  }

  .hero-montage .visual-card:first-child.has-image {
    min-height: 520px;
  }

  .project-card,
  .project-card.reverse {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .project-card.reverse .project-info {
    order: initial;
  }

  .project-card .image-placeholder {
    min-height: 380px;
  }

  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .case-title-grid,
  .case-two-col,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .case-info {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .flow-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .case-kicker {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .mockup {
    min-height: 520px;
  }

  .mockup.short {
    min-height: 330px;
  }
}

/* iPad / tablet portrait and small laptop */
@media (max-width: 900px) {
  main {
    padding-inline: 22px;
  }

  .site-nav {
    position: sticky;
  }

  .nav-inner {
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 14px;
    padding: 18px 22px;
  }

  .nav-links {
    display: flex;
    order: 3;
    width: 100%;
    overflow-x: auto;
    gap: 18px;
    padding-top: 4px;
    scrollbar-width: none;
  }

  .nav-links::-webkit-scrollbar {
    display: none;
  }

  .nav-links a {
    white-space: nowrap;
  }

  .availability {
    margin-left: auto;
  }

  .section {
    padding: 88px 0;
  }

  .section-sm {
    padding: 60px 0;
  }

  .hero {
    padding: 56px 0 72px;
  }

  h1 {
    font-size: clamp(42px, 10vw, 72px);
  }

  h2 {
    font-size: clamp(34px, 8vw, 56px);
  }

  .lead {
    font-size: clamp(19px, 3.2vw, 24px);
  }

  .hero-montage {
    grid-template-columns: 1fr;
  }

  .hero-montage .visual-card:first-child.has-image,
  .visual-card,
  .project-card .image-placeholder,
  .mockup {
    min-height: 420px;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .case-title-grid {
    gap: 28px;
  }

  .case-info {
    grid-template-columns: 1fr;
  }

  .case-section {
    padding: 76px 0;
  }

  .case-two-col {
    gap: 28px;
  }

  .flow-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .case-kicker {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .persona-card {
    grid-template-columns: 220px 1fr;
  }

  .palette {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Phone */
@media (max-width: 640px) {
  main {
    padding-inline: 16px;
  }

  .nav-inner {
    padding: 16px;
  }

  .brand {
    font-size: 21px;
  }

  .availability {
    display: none;
  }

  .nav-links {
    justify-content: flex-start;
    gap: 16px;
    font-size: 11px;
  }

  .hero {
    padding: 44px 0 56px;
  }

  .section {
    padding: 70px 0;
  }

  .section-sm {
    padding: 50px 0;
  }

  h1 {
    font-size: clamp(38px, 13vw, 56px);
    line-height: .98;
  }

  h2 {
    font-size: clamp(30px, 10vw, 42px);
  }

  h3 {
    font-size: clamp(24px, 8vw, 34px);
  }

  h4 {
    font-size: 20px;
  }

  .lead {
    font-size: 18px;
  }

  .body-text {
    font-size: 16px;
    line-height: 1.6;
  }

  .small {
    font-size: 14px;
  }

  .button-row {
    width: 100%;
  }

  .btn {
    width: 100%;
    min-height: 52px;
  }

  .hero-montage .visual-card:first-child.has-image,
  .visual-card,
  .project-card .image-placeholder,
  .mockup {
    min-height: 320px;
  }

  .mockup.short {
    min-height: 260px;
  }

  .project-grid {
    gap: 58px;
  }

  .project-card {
    gap: 22px;
  }

  .card {
    min-height: auto;
    padding: 22px;
  }

  .case-hero {
    padding: 52px 0 38px;
  }

  .case-section {
    padding: 58px 0;
  }

  .flow-row,
  .case-kicker,
  .palette,
  .persona-meta {
    grid-template-columns: 1fr;
  }

  .flow-screen {
    aspect-ratio: auto;
    min-height: 140px;
  }

  .workflow-step {
    min-height: auto;
  }

  .persona-card {
    grid-template-columns: 1fr;
    padding: 20px;
  }

  .persona-card img {
    max-height: 440px;
  }

  .resume-card {
    grid-template-columns: 1fr;
  }

  .contact-layout {
    min-height: auto;
    padding: 64px 0;
  }

  .contact-row {
    flex-direction: column;
    gap: 8px;
    font-size: 18px;
  }

  .footer {
    margin-top: 48px;
  }

  .footer-inner {
    padding: 28px 16px;
  }

  .footer-links {
    flex-wrap: wrap;
  }
}

/* Very narrow phones */
@media (max-width: 390px) {
  main {
    padding-inline: 14px;
  }

  .brand {
    font-size: 19px;
  }

  .nav-links {
    gap: 14px;
  }

  .hero-montage .visual-card:first-child.has-image,
  .visual-card,
  .project-card .image-placeholder,
  .mockup {
    min-height: 280px;
  }

  .card,
  .persona-card {
    padding: 18px;
  }
}