/* ============================================================
   VIVIEN TAM — Futuristic Portfolio
   Design tokens + base + components
   ============================================================ */

:root {
  /* Type scale (fluid) */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(3rem, 0.5rem + 7vw, 8rem);

  /* Spacing */
  --space-1: 0.25rem;  --space-2: 0.5rem;  --space-3: 0.75rem;
  --space-4: 1rem;     --space-5: 1.25rem; --space-6: 1.5rem;
  --space-8: 2rem;     --space-10: 2.5rem; --space-12: 3rem;
  --space-16: 4rem;    --space-20: 5rem;   --space-24: 6rem;
  --space-32: 8rem;

  --radius-sm: 0.375rem; --radius-md: 0.5rem; --radius-lg: 0.75rem;
  --radius-xl: 1rem;     --radius-2xl: 1.5rem; --radius-full: 9999px;

  --transition-interactive: 200ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 640px;
  --content-default: 1080px;
  --content-wide: 1280px;

  --font-display: 'Clash Display', 'Space Grotesk', sans-serif;
  --font-body: 'Satoshi', 'Inter', system-ui, sans-serif;
}

/* DARK MODE (default for futuristic aesthetic) */
:root,
[data-theme='dark'] {
  --color-bg: #050510;
  --color-bg-2: #08081a;
  --color-surface: rgba(255, 255, 255, 0.03);
  --color-surface-2: rgba(255, 255, 255, 0.05);
  --color-border: rgba(255, 255, 255, 0.09);
  --color-border-strong: rgba(255, 255, 255, 0.16);

  --color-text: #eef0ff;
  --color-text-muted: #9ea3c7;
  --color-text-faint: #5c608a;

  --color-cyan: #3ee8ff;
  --color-violet: #a06bff;
  --color-primary: #4fd6ff;
  --color-primary-hover: #7ee2ff;

  --glow-cyan: rgba(62, 232, 255, 0.35);
  --glow-violet: rgba(160, 107, 255, 0.35);

  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(79, 214, 255, 0.15);

  --grad-accent: linear-gradient(120deg, #3ee8ff 0%, #6b8bff 45%, #a06bff 100%);
}

/* LIGHT MODE */
[data-theme='light'] {
  --color-bg: #f4f5fb;
  --color-bg-2: #eceefb;
  --color-surface: rgba(10, 12, 40, 0.02);
  --color-surface-2: rgba(10, 12, 40, 0.04);
  --color-border: rgba(20, 22, 60, 0.1);
  --color-border-strong: rgba(20, 22, 60, 0.18);

  --color-text: #10132e;
  --color-text-muted: #545a83;
  --color-text-faint: #9297bc;

  --color-cyan: #009fc7;
  --color-violet: #7a3ce0;
  --color-primary: #0a86c9;
  --color-primary-hover: #076a9f;

  --glow-cyan: rgba(0, 159, 199, 0.2);
  --glow-violet: rgba(122, 60, 224, 0.2);

  --shadow-md: 0 8px 28px rgba(20, 24, 70, 0.12);
  --shadow-glow: 0 0 40px rgba(10, 134, 201, 0.12);

  --grad-accent: linear-gradient(120deg, #0087c9 0%, #4b63d6 45%, #7a3ce0 100%);
}

/* ============================================================
   BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: none; text-size-adjust: none;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-24);
}

body {
  min-height: 100dvh;
  line-height: 1.65;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
  position: relative;
}

img, picture, svg, canvas { display: block; max-width: 100%; height: auto; }
ul[role='list'] { list-style: none; }
button { cursor: pointer; background: none; border: none; color: inherit; font: inherit; }
a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 { text-wrap: balance; line-height: 1.08; font-family: var(--font-display); font-weight: 600; }
p { text-wrap: pretty; }

::selection { background: var(--glow-cyan); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important; animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important; scroll-behavior: auto !important;
  }
}

/* ============================================================
   AMBIENT BACKGROUND
   ============================================================ */
.aurora {
  position: fixed; inset: 0; z-index: -2; pointer-events: none; overflow: hidden;
}
.aurora::before, .aurora::after {
  content: ''; position: absolute; border-radius: 50%;
  filter: blur(90px); opacity: 0.55;
}
.aurora::before {
  width: 55vw; height: 55vw; top: -15vw; left: -10vw;
  background: radial-gradient(circle, var(--glow-violet), transparent 70%);
  animation: drift1 26s ease-in-out infinite alternate;
}
.aurora::after {
  width: 50vw; height: 50vw; bottom: -12vw; right: -8vw;
  background: radial-gradient(circle, var(--glow-cyan), transparent 70%);
  animation: drift2 30s ease-in-out infinite alternate;
}
@keyframes drift1 { to { transform: translate(12vw, 10vh) scale(1.15); } }
@keyframes drift2 { to { transform: translate(-10vw, -8vh) scale(1.2); } }

.grid-overlay {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 20%, transparent 75%);
  opacity: 0.5;
}

/* ============================================================
   LAYOUT
   ============================================================ */
.wrap { width: min(100% - 2.5rem, var(--content-wide)); margin-inline: auto; }
.section { padding-block: clamp(var(--space-16), 10vw, var(--space-32)); position: relative; }

.eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs); letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--color-primary); font-weight: 600; margin-bottom: var(--space-5);
}
.eyebrow::before {
  content: ''; width: 28px; height: 1px; background: var(--grad-accent);
}

.grad-text {
  background: var(--grad-accent); -webkit-background-clip: text;
  background-clip: text; color: transparent;
}

/* ============================================================
   HEADER
   ============================================================ */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding-block: var(--space-4);
  transition: transform 0.35s var(--ease-out), background 0.35s var(--ease-out), border-color 0.35s;
  border-bottom: 1px solid transparent;
}
.header--scrolled {
  background: color-mix(in oklab, var(--color-bg) 78%, transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}
.header__inner { display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: var(--space-3); font-family: var(--font-display); font-weight: 600; font-size: var(--text-base); letter-spacing: -0.01em; }
.logo svg { width: 30px; height: 30px; color: var(--color-primary); }
.nav { display: flex; align-items: center; gap: var(--space-8); }
.nav__links { display: flex; gap: var(--space-6); }
.nav__links a { font-size: var(--text-sm); color: var(--color-text-muted); position: relative; transition: color var(--transition-interactive); }
.nav__links a::after {
  content: ''; position: absolute; left: 0; bottom: -4px; height: 1.5px; width: 0;
  background: var(--grad-accent); transition: width var(--transition-interactive);
}
.nav__links a:hover { color: var(--color-text); }
.nav__links a:hover::after { width: 100%; }

.icon-btn {
  display: grid; place-items: center; width: 40px; height: 40px;
  border-radius: var(--radius-full); color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  transition: color var(--transition-interactive), border-color var(--transition-interactive), background var(--transition-interactive);
}
.icon-btn:hover { color: var(--color-text); border-color: var(--color-border-strong); background: var(--color-surface); }

.menu-toggle { display: none; }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-sm); font-weight: 600; padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive), background var(--transition-interactive), border-color var(--transition-interactive), color var(--transition-interactive);
}
.btn--primary {
  color: #050510; background: var(--grad-accent); box-shadow: var(--shadow-glow);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 0 48px rgba(79,214,255,0.32); }
.btn--primary:active { transform: translateY(0); }
.btn--ghost { border: 1px solid var(--color-border-strong); color: var(--color-text); }
.btn--ghost:hover { transform: translateY(-2px); border-color: var(--color-primary); color: var(--color-primary); }
.btn--ghost:active { transform: translateY(0); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: 100svh; display: flex; align-items: center;
  position: relative; padding-top: var(--space-24);
}
.hero__bg {
  position: absolute; inset: 0; z-index: -1; overflow: hidden;
}
.hero__bg img { width: 100%; height: 100%; object-fit: cover; opacity: 0.55; }
.hero__bg::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 30%, var(--color-bg) 96%),
              radial-gradient(ellipse 60% 50% at 50% 45%, transparent, var(--color-bg) 90%);
}
.hero__content { max-width: 900px; }
.hero h1 {
  font-size: var(--text-hero); font-weight: 600; letter-spacing: -0.03em;
  margin-block: var(--space-4) var(--space-6);
}
.hero__lead {
  font-size: var(--text-lg); color: var(--color-text-muted); max-width: 60ch;
  margin-bottom: var(--space-10);
}
.hero__cta { display: flex; flex-wrap: wrap; gap: var(--space-4); }
.hero__meta {
  display: flex; flex-wrap: wrap; gap: var(--space-8); margin-top: var(--space-16);
  padding-top: var(--space-8); border-top: 1px solid var(--color-border);
}
.hero__meta div { display: flex; flex-direction: column; }
.hero__meta .num { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 600; }
.hero__meta .lbl { font-size: var(--text-xs); color: var(--color-text-faint); letter-spacing: 0.08em; text-transform: uppercase; }

/* ============================================================
   SECTION HEADINGS
   ============================================================ */
.sec-head { max-width: 720px; margin-bottom: var(--space-16); }
.sec-head h2 { font-size: var(--text-2xl); letter-spacing: -0.02em; margin-bottom: var(--space-5); }
.sec-head p { font-size: var(--text-lg); color: var(--color-text-muted); }

/* ============================================================
   WORK
   ============================================================ */
.work-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: var(--space-6); }
.work-card {
  position: relative; overflow: hidden; border-radius: var(--radius-2xl);
  border: 1px solid var(--color-border); background: var(--color-surface);
  min-height: 380px; display: flex; flex-direction: column; justify-content: flex-end;
  transition: transform var(--transition-interactive), border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.work-card:hover { transform: translateY(-4px); border-color: var(--color-border-strong); box-shadow: var(--shadow-md); }
.work-card--wide { grid-column: span 7; }
.work-card--tall { grid-column: span 5; }
.work-card--half { grid-column: span 6; }
.work-card__img { position: absolute; inset: 0; z-index: 0; }
.work-card__img img { width: 100%; height: 100%; object-fit: cover; opacity: 0.5; transition: opacity var(--transition-interactive), transform 0.6s var(--ease-out); }
.work-card:hover .work-card__img img { opacity: 0.7; transform: scale(1.05); }
.work-card__img::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(0deg, var(--color-bg) 5%, color-mix(in oklab, var(--color-bg) 40%, transparent) 55%, transparent 100%);
}
.work-card__body { position: relative; z-index: 1; padding: var(--space-8); }
.work-card__tag {
  display: inline-block; font-size: var(--text-xs); letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--color-primary); margin-bottom: var(--space-3); font-weight: 600;
}
.work-card__body h3 { font-size: var(--text-xl); margin-bottom: var(--space-3); }
.work-card__body p { color: var(--color-text-muted); font-size: var(--text-sm); max-width: 46ch; }
.work-card__link {
  display: inline-flex; align-items: center; gap: var(--space-2); margin-top: var(--space-5);
  font-size: var(--text-sm); font-weight: 600; color: var(--color-text);
}
.work-card__link svg { transition: transform var(--transition-interactive); }
.work-card:hover .work-card__link svg { transform: translateX(4px); }

/* ============================================================
   ABOUT
   ============================================================ */
.about { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-16); align-items: center; }
.about__visual {
  position: relative; border-radius: var(--radius-2xl); overflow: hidden;
  border: 1px solid var(--color-border); aspect-ratio: 3/4;
}
.about__visual img { width: 100%; height: 100%; object-fit: cover; }
.about__text h2 { font-size: var(--text-2xl); letter-spacing: -0.02em; margin-bottom: var(--space-6); }
.about__text p { color: var(--color-text-muted); margin-bottom: var(--space-5); }
.about__text p strong { color: var(--color-text); font-weight: 600; }

/* ============================================================
   FOCUS AREAS
   ============================================================ */
.focus-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: var(--space-5); }
.focus-card {
  padding: var(--space-8); border-radius: var(--radius-xl);
  border: 1px solid var(--color-border); background: var(--color-surface);
  transition: border-color var(--transition-interactive), background var(--transition-interactive), transform var(--transition-interactive);
}
.focus-card:hover { border-color: var(--color-border-strong); background: var(--color-surface-2); transform: translateY(-3px); }
.focus-card__ico {
  width: 48px; height: 48px; display: grid; place-items: center; border-radius: var(--radius-md);
  background: color-mix(in oklab, var(--color-primary) 14%, transparent);
  color: var(--color-primary); margin-bottom: var(--space-5);
}
.focus-card h3 { font-size: var(--text-lg); margin-bottom: var(--space-3); }
.focus-card p { font-size: var(--text-sm); color: var(--color-text-muted); }

/* ============================================================
   CONTACT
   ============================================================ */
.contact { text-align: center; }
.contact__panel {
  position: relative; overflow: hidden; border-radius: var(--radius-2xl);
  border: 1px solid var(--color-border); background: var(--color-surface);
  padding: clamp(var(--space-12), 8vw, var(--space-32)) var(--space-8);
}
.contact__panel::before {
  content: ''; position: absolute; inset: 0; z-index: 0; opacity: 0.5;
  background: radial-gradient(ellipse 60% 100% at 50% 0%, var(--glow-violet), transparent 70%),
              radial-gradient(ellipse 60% 100% at 50% 100%, var(--glow-cyan), transparent 70%);
}
.contact__panel > * { position: relative; z-index: 1; }
.contact h2 { font-size: var(--text-2xl); letter-spacing: -0.02em; margin-bottom: var(--space-5); }
.contact p { color: var(--color-text-muted); max-width: 52ch; margin-inline: auto; margin-bottom: var(--space-10); }
.contact__cta { display: flex; flex-wrap: wrap; gap: var(--space-4); justify-content: center; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer { border-top: 1px solid var(--color-border); padding-block: var(--space-12); }
.footer__inner { display: flex; flex-wrap: wrap; gap: var(--space-6); justify-content: space-between; align-items: center; }
.footer__meta { font-size: var(--text-sm); color: var(--color-text-faint); }
.footer__links { display: flex; gap: var(--space-6); }
.footer__links a { font-size: var(--text-sm); color: var(--color-text-muted); transition: color var(--transition-interactive); }
.footer__links a:hover { color: var(--color-primary); }

/* ============================================================
   SCROLL REVEAL (opacity-only, no CLS)
   ============================================================ */
.reveal { opacity: 1; }
@supports (animation-timeline: view()) {
  .reveal {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% cover 25%;
  }
}
@keyframes reveal-fade { to { opacity: 1; } }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .work-card--wide, .work-card--tall, .work-card--half { grid-column: span 12; }
  .about { grid-template-columns: 1fr; gap: var(--space-10); }
  .about__visual { aspect-ratio: 4/3; max-width: 480px; }
}

@media (max-width: 720px) {
  .nav__links { display: none; }
  .menu-toggle {
    display: grid; place-items: center; width: 40px; height: 40px;
    border-radius: var(--radius-full); border: 1px solid var(--color-border); color: var(--color-text);
  }
  .nav__links--open {
    display: flex; flex-direction: column; position: absolute; top: 100%; right: 1.25rem;
    background: color-mix(in oklab, var(--color-bg) 92%, transparent); backdrop-filter: blur(16px);
    border: 1px solid var(--color-border); border-radius: var(--radius-lg);
    padding: var(--space-5) var(--space-6); gap: var(--space-4); min-width: 180px;
  }
  .hero__meta { gap: var(--space-6); }
  .work-card { min-height: 320px; }
}

@media (hover: none) {
  .work-card:hover, .btn:hover, .focus-card:hover { transform: none; }
}