/* ═══════════════════════════════════════════════════════════
   ALEX LIU — PIXEL-PERFECT DESIGN SYSTEM
   Spring easing · Squircle radius · Full state coverage
   GPU-only · WCAG 2.1 AAA · Zero compromise
   ═══════════════════════════════════════════════════════════ */

/* ─── FONT STACK ─── */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap");

/* ─── DESIGN TOKENS ─── */
:root {
  /* Palette — near-Apple blacks */
  --c-bg:          #000000;
  --c-surface:     #0a0a0a;
  --c-surface-2:   #111117;
  --c-surface-3:   #18181f;
  --c-border:      rgba(255,255,255,0.07);
  --c-border-hi:   rgba(255,255,255,0.14);

  /* Brand */
  --c-primary:     #7B61FF;
  --c-primary-rgb: 123,97,255;
  --c-accent:      #00d4aa;
  --c-accent-rgb:  0,212,170;
  --c-warm:        #FF9F5B;
  --c-danger:      #ff4d4d;

  /* Text — Apple-tuned grays */
  --c-text:        #f5f5f7;
  --c-text-2:      #a1a1aa;
  --c-text-3:      #52525b;
  --c-white:       #ffffff;

  /* Typography — system-first with Inter override */
  --f-sans:  'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', system-ui, sans-serif;
  --f-mono:  'SF Mono', 'Fira Code', ui-monospace, monospace;

  /* Spacing */
  --sp-xs:   8px;
  --sp-sm:   16px;
  --sp-md:   32px;
  --sp-lg:   64px;
  --sp-xl:   120px;
  --sp-2xl:  200px;

  /* Layout */
  --max-w:   1140px;

  /* Squircle-style radius (Apple's smooth radius) */
  --radius:  22px;
  --radius-sm: 14px;
  --radius-xs: 10px;

  /* ─── Motion Tokens — Spring & Damping ─── */
  --spring:     cubic-bezier(0.34, 1.56, 0.64, 1);   /* Spring overshoot */
  --spring-sm:  cubic-bezier(0.22, 1.2, 0.36, 1);    /* Subtle spring */
  --ease-out:   cubic-bezier(0.16, 1, 0.3, 1);       /* Apple-style out */
  --ease-in:    cubic-bezier(0.7, 0, 0.84, 0);
  --ease-io:    cubic-bezier(0.87, 0, 0.13, 1);

  --dur-fast:   0.2s;
  --dur-med:    0.45s;
  --dur-slow:   0.8s;
  --dur-xslow:  1.2s;

  /* Z-layers */
  --z-noise:   1;
  --z-content: 2;
  --z-nav:     100;
  --z-cursor:  9999;
}

/* ─── LIGHT THEME ─── */
[data-theme="light"] {
  --c-bg:        #f5f5f7;
  --c-surface:   #ffffff;
  --c-surface-2: #f0f0f2;
  --c-surface-3: #e8e8ec;
  --c-border:    rgba(0,0,0,0.06);
  --c-border-hi: rgba(0,0,0,0.12);
  --c-text:      #1d1d1f;
  --c-text-2:    #6e6e73;
  --c-text-3:    #a1a1a6;
  --c-white:     #1d1d1f;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--f-sans);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  cursor: none;
  /* Chinese typography: optimize word-break */
  word-break: break-all;
  overflow-wrap: break-word;
}

img {
  max-width: 100%;
  display: block;
  -webkit-user-drag: none;
}

a {
  color: inherit;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

button {
  font-family: inherit;
  cursor: none;
  -webkit-tap-highlight-color: transparent;
}

/* Focus visible — WCAG AAA — Apple ring */
:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 4px;
  border-radius: var(--radius-xs);
}

/* Reduced motion — total respect */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  html { scroll-behavior: auto; }
}

/* Selection */
::selection {
  background: rgba(var(--c-primary-rgb), 0.3);
  color: var(--c-white);
}

/* ═══════════════════════════════════════════════════════════
   GLOBAL EFFECTS
   ═══════════════════════════════════════════════════════════ */

/* Noise Overlay */
.noise {
  position: fixed;
  inset: -50%;
  width: 200%;
  height: 200%;
  z-index: var(--z-noise);
  pointer-events: none;
  opacity: 0.032;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 256px 256px;
}

/* Scroll Progress Bar */
.scroll-bar {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  z-index: calc(var(--z-nav) + 1);
  will-change: width;
  transform-origin: left;
}

/* ─── CUSTOM CURSOR ─── */
.cursor-dot,
.cursor-ring {
  position: fixed;
  top: 0; left: 0;
  border-radius: 50%;
  pointer-events: none;
  z-index: var(--z-cursor);
  will-change: transform;
}

.cursor-dot {
  width: 8px;
  height: 8px;
  background: var(--c-primary);
  transform: translate(-50%, -50%);
  transition: opacity 0.2s;
}

.cursor-ring {
  width: 40px;
  height: 40px;
  background: rgba(var(--c-primary-rgb), 0.15);
  border: none;
  transform: translate(-50%, -50%);
  transition: width 0.3s cubic-bezier(0.2, 1, 0.3, 1), height 0.3s cubic-bezier(0.2, 1, 0.3, 1),
              background 0.3s, opacity 0.2s;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

body.cursor-hover .cursor-ring {
  width: 65px;
  height: 65px;
  background: rgba(var(--c-accent-rgb), 0.2);
}

body.cursor-hover .cursor-dot {
  opacity: 0;
}

body.cursor-click .cursor-ring {
  transform: translate(-50%, -50%) scale(0.85);
}

@media (pointer: coarse) {
  .cursor-dot, .cursor-ring { display: none; }
  body, button, a { cursor: auto; }
  button, a { cursor: pointer; }
}

/* ═══════════════════════════════════════════════════════════
   CONTAINER
   ═══════════════════════════════════════════════════════════ */
.container {
  width: min(var(--max-w), 100% - 48px);
  margin-inline: auto;
}

/* ═══════════════════════════════════════════════════════════
   NAVIGATION
   ═══════════════════════════════════════════════════════════ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  padding: 20px 48px;
  transition: padding var(--dur-med) var(--ease-out),
              background var(--dur-med) var(--ease-out),
              border-color var(--dur-med);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  padding: 12px 48px;
  background: rgba(0,0,0,0.82);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom-color: var(--c-border);
}

[data-theme="light"] .nav.scrolled {
  background: rgba(245,245,247,0.88);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-w);
  margin: 0 auto;
}

.nav-logo {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-white);
  transition: opacity var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--spring-sm);
}
.nav-logo:hover  { opacity: 0.7; transform: scale(0.97); }
.nav-logo:active { opacity: 0.5; transform: scale(0.94); }

.nav-links {
  display: flex;
  gap: 2px;
  align-items: center;
}

.nav-link {
  position: relative;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--c-text-2);
  padding: 8px 14px;
  border-radius: 100px;
  transition: color var(--dur-fast) var(--ease-out);
}

.nav-link::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: rgba(255,255,255,0.06);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-out);
}

.nav-link:hover, .nav-link.active { color: var(--c-white); }
.nav-link:hover::before, .nav-link.active::before { opacity: 1; }
.nav-link:active { transform: scale(0.96); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-social {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-2);
  transition: background var(--dur-fast) var(--ease-out),
              color var(--dur-fast),
              transform var(--dur-fast) var(--spring-sm);
}
.nav-social:hover  { background: rgba(255,255,255,0.12); color: var(--c-white); transform: scale(1.06); }
.nav-social:active { transform: scale(0.92); }

/* Theme Toggle */
.theme-btn {
  position: relative;
  width: 40px;
  height: 40px;
  border: none;
  background: rgba(255,255,255,0.06);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-2);
  transition: background var(--dur-fast) var(--ease-out),
              color var(--dur-fast),
              transform var(--dur-fast) var(--spring-sm);
}
.theme-btn:hover  { background: rgba(255,255,255,0.12); color: var(--c-white); transform: scale(1.06); }
.theme-btn:active { transform: scale(0.92); }

.theme-icon { display: flex; align-items: center; justify-content: center; }
.theme-icon--moon { display: none; }
[data-theme="dark"] .theme-icon--sun  { display: none; }
[data-theme="dark"] .theme-icon--moon { display: flex; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  padding: 10px;
  border-radius: var(--radius-xs);
  transition: background var(--dur-fast), transform var(--dur-fast) var(--spring-sm);
}
.hamburger:hover  { background: rgba(255,255,255,0.06); }
.hamburger:active { transform: scale(0.9); }
.hamburger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform var(--dur-med) var(--spring), opacity var(--dur-fast);
  transform-origin: center;
}
.hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.97);
  backdrop-filter: blur(32px);
  -webkit-backdrop-filter: blur(32px);
  z-index: calc(var(--z-nav) - 1);
  display: flex;
  align-items: center;
  justify-content: center;
  visibility: hidden;
  opacity: 0;
  transition: opacity var(--dur-med) var(--ease-out), visibility var(--dur-med);
  overscroll-behavior: contain;
}
.mobile-menu.open { visibility: visible; opacity: 1; }

.mobile-menu nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.mobile-link {
  font-size: 2.8rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: rgba(255,255,255,0.35);
  padding: 8px 24px;
  transition: color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--spring-sm);
}
.mobile-link:hover  { color: var(--c-white); transform: scale(1.04); }
.mobile-link:active { transform: scale(0.96); }

/* ═══════════════════════════════════════════════════════════
   SECTIONS — BASE
   ═══════════════════════════════════════════════════════════ */
.section {
  position: relative;
  padding: var(--sp-2xl) 0;
  overflow: hidden;
}

.section-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-primary);
  margin-bottom: 20px;
}

.section-heading {
  font-size: clamp(2.6rem, 5.5vw, 4.8rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.08;
  color: var(--c-white);
  margin-bottom: var(--sp-lg);
}

.section-heading em {
  font-style: normal;
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ═══════════════════════════════════════════════════════════
   SCROLL REVEAL — GPU-only
   ═══════════════════════════════════════════════════════════ */
.reveal-up, .reveal-left, .reveal-right, .ch-reveal {
  will-change: transform, opacity;
}

.reveal-up {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
  transition-delay: var(--delay, 0s);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-36px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}

.reveal-right {
  opacity: 0;
  transform: translateX(36px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}

.reveal-up.in, .reveal-left.in, .reveal-right.in {
  opacity: 1;
  transform: translate(0);
}

/* Hero character reveal */
.ch-reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
  transition-delay: var(--delay, 0s);
}
.ch-reveal.in { opacity: 1; transform: translateY(0); }

/* ═══════════════════════════════════════════════════════════
   01 · HERO
   ═══════════════════════════════════════════════════════════ */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0;
  background: var(--c-bg);
  overflow: hidden;
}

/* Gradient orbs */
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  will-change: transform;
}
.orb--1 {
  width: 600px; height: 600px;
  background: rgba(var(--c-primary-rgb), 0.12);
  top: -100px; left: -200px;
  animation: orbDrift1 20s ease-in-out infinite;
}
.orb--2 {
  width: 500px; height: 500px;
  background: rgba(var(--c-accent-rgb), 0.08);
  bottom: -100px; right: -150px;
  animation: orbDrift2 25s ease-in-out infinite;
}
.orb--3 {
  width: 400px; height: 400px;
  background: rgba(var(--c-primary-rgb), 0.06);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  animation: orbPulse 8s ease-in-out infinite;
}

@keyframes orbDrift1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%  { transform: translate(80px, 40px) scale(1.08); }
  66%  { transform: translate(-40px, 80px) scale(0.95); }
}
@keyframes orbDrift2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  40%  { transform: translate(-60px, -30px) scale(1.05); }
  70%  { transform: translate(40px, 60px) scale(0.92); }
}
@keyframes orbPulse {
  0%, 100% { opacity: 0.5; transform: translate(-50%, -50%) scale(1); }
  50%  { opacity: 1; transform: translate(-50%, -50%) scale(1.2); }
}

.hero-content {
  position: relative;
  z-index: var(--z-content);
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 900px;
  padding: 0 24px;
}

.hero-eyebrow {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-text-3);
  margin-bottom: 28px;
  --delay: 0.1s;
}

.hero-name {
  font-size: clamp(4.2rem, 13vw, 10.5rem);
  font-weight: 900;
  letter-spacing: -0.05em;
  line-height: 1;
  color: var(--c-white);
  margin-bottom: 32px;
  --delay: 0.25s;
}

.hero-name-cn {
  display: inline-block;
  background: linear-gradient(180deg, #ffffff 40%, rgba(255,255,255,0.55) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="light"] .hero-name-cn {
  background: linear-gradient(180deg, #1d1d1f 40%, rgba(29,29,31,0.6) 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

.hero-tagline {
  font-size: clamp(1.05rem, 2.5vw, 1.55rem);
  font-weight: 400;
  color: var(--c-text-2);
  min-height: 1.8em;
  margin-bottom: 24px;
  --delay: 0.4s;
}

.cursor-blink {
  color: var(--c-primary);
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-sub {
  font-size: 1.02rem;
  color: var(--c-text-3);
  line-height: 1.75;
  margin-bottom: 48px;
  --delay: 0.5s;
}
.hero-sub strong { color: var(--c-text-2); font-weight: 600; }

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  --delay: 0.65s;
}

/* Scroll indicator */
.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  opacity: 0.3;
  animation: fadeInUp 1s 1.5s both;
}

.scroll-line {
  width: 1px;
  height: 56px;
  background: linear-gradient(180deg, transparent, var(--c-text));
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { transform: scaleY(1); opacity: 0.45; }
  50%       { transform: scaleY(0.5); opacity: 1; }
}

.hero-scroll span {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateX(-50%) translateY(20px); }
  to   { opacity: 0.3; transform: translateX(-50%) translateY(0); }
}

/* ═══════════════════════════════════════════════════════════
   BUTTONS — Full Lifecycle (Hover / Active / Focus / Disabled)
   ═══════════════════════════════════════════════════════════ */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 34px;
  background: var(--c-primary);
  color: #fff;
  font-size: 0.93rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  border-radius: 100px;
  border: none;
  position: relative;
  overflow: hidden;
  transition: transform var(--dur-fast) var(--spring-sm),
              box-shadow var(--dur-med) var(--ease-out),
              background var(--dur-fast);
  box-shadow: 0 0 0 0 rgba(var(--c-primary-rgb), 0);
}

/* Shimmer highlight on primary */
.btn-primary::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 200%; height: 100%;
  background: linear-gradient(90deg, transparent 30%, rgba(255,255,255,0.12) 50%, transparent 70%);
  transition: left 0.6s var(--ease-out);
  pointer-events: none;
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 32px rgba(var(--c-primary-rgb), 0.35);
}
.btn-primary:hover::after {
  left: 100%;
}
.btn-primary:active {
  transform: translateY(0) scale(0.97);
  box-shadow: 0 2px 8px rgba(var(--c-primary-rgb), 0.2);
}
.btn-primary:disabled, .btn-primary.disabled {
  opacity: 0.45;
  pointer-events: none;
  transform: none;
  box-shadow: none;
}
.btn-primary:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 3px;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 32px;
  background: transparent;
  color: var(--c-text-2);
  font-size: 0.93rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  border-radius: 100px;
  border: 1px solid var(--c-border-hi);
  transition: border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast),
              transform var(--dur-fast) var(--spring-sm),
              background var(--dur-fast);
}
.btn-ghost:hover {
  border-color: rgba(255,255,255,0.28);
  color: var(--c-white);
  background: rgba(255,255,255,0.03);
  transform: translateY(-2px) scale(1.02);
}
.btn-ghost:active {
  transform: translateY(0) scale(0.97);
  background: rgba(255,255,255,0.06);
}

.w-full { width: 100%; }
.magnetic { transform-style: preserve-3d; }

/* ═══════════════════════════════════════════════════════════
   02 · ABOUT
   ═══════════════════════════════════════════════════════════ */
.about {
  background: var(--c-surface);
}

.about-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 80px;
  align-items: center;
}

.about-portrait { position: relative; }

.portrait-frame {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 1/1;
  box-shadow: 0 40px 80px rgba(0,0,0,0.4);
  background: var(--c-surface-2);
}

.portrait-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid rgba(255,255,255,0.08);
  pointer-events: none;
}

/* ─── BLUR-UP IMAGE PATTERN ─── */
.blur-up {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: blur(20px);
  transform: scale(1.05);
  transition: filter 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.blur-up.loaded {
  filter: blur(0);
  transform: scale(1);
}

/* Image error fallback */
.blur-up.error {
  filter: blur(0);
  transform: scale(1);
  opacity: 0;
}
.blur-up.error ~ .img-placeholder {
  opacity: 1;
}

.img-placeholder {
  position: absolute;
  inset: 0;
  background: var(--c-surface-3);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s;
  border-radius: inherit;
}
.img-placeholder::after {
  content: 'AL';
  font-size: 3rem;
  font-weight: 800;
  color: var(--c-text-3);
  letter-spacing: -0.04em;
}

.about-portrait:hover .blur-up.loaded {
  transform: scale(1.03);
}

.about-body {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.about-lead {
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  font-weight: 500;
  line-height: 1.55;
  color: var(--c-text);
  letter-spacing: -0.01em;
}

.about-text {
  font-size: 1.02rem;
  color: var(--c-text-2);
  line-height: 1.85;
}
.about-text strong { color: var(--c-text); font-weight: 600; }

/* Stats */
.stats-row {
  display: flex;
  gap: 48px;
  padding-top: 40px;
  margin-top: 8px;
  border-top: 1px solid var(--c-border);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-n {
  font-size: clamp(2.4rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-l {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--c-text-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ═══════════════════════════════════════════════════════════
   03 · SKILLS
   ═══════════════════════════════════════════════════════════ */
.skills {
  background: var(--c-bg);
}

.skills-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: start;
}

.skills-chart {
  position: sticky;
  top: 120px;
}

#radarCanvas {
  width: 100%;
  height: auto;
  max-width: 440px;
}

.skills-categories {
  display: flex;
  flex-direction: column;
  gap: 56px;
}

.skill-cat-title {
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text-3);
  margin-bottom: 14px;
}

.skill-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill {
  font-size: 0.85rem;
  font-weight: 500;
  padding: 7px 16px;
  border-radius: 100px;
  border: 1px solid var(--c-border-hi);
  color: var(--c-text-2);
  background: transparent;
  cursor: default;
  transition: all var(--dur-fast) var(--spring-sm);
}
.pill:hover {
  color: var(--c-white);
  border-color: rgba(var(--c-primary-rgb), 0.4);
  background: rgba(var(--c-primary-rgb), 0.08);
  transform: translateY(-3px) scale(1.03);
}
.pill.accent:hover {
  border-color: rgba(var(--c-accent-rgb), 0.4);
  background: rgba(var(--c-accent-rgb), 0.08);
}
.pill.warm:hover {
  border-color: rgba(255,159,91,0.4);
  background: rgba(255,159,91,0.08);
}

/* ═══════════════════════════════════════════════════════════
   04 · EXPERIENCE
   ═══════════════════════════════════════════════════════════ */
.experience {
  background: var(--c-surface);
}

.exp-narrative {
  width: min(var(--max-w), 100% - 48px);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  position: relative;
}

.exp-narrative::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 1px;
  background: linear-gradient(180deg,
    transparent 0%, var(--c-border) 5%, var(--c-border) 95%, transparent 100%);
}

.exp-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 64px;
  padding: 64px 0;
  border-bottom: 1px solid var(--c-border);
  position: relative;
  transition: background var(--dur-fast);
}
.exp-item:last-child { 
  border-bottom: none; 
  padding-bottom: 32px;
}

/* Timeline dot */
.exp-item::before {
  content: '';
  position: absolute;
  left: -5px; top: 72px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--c-surface-3);
  border: 2px solid var(--c-border-hi);
  transition: background var(--dur-fast) var(--spring-sm),
              border-color var(--dur-fast),
              transform var(--dur-fast) var(--spring);
}
.exp-item:hover::before {
  background: var(--c-primary);
  border-color: var(--c-primary);
  transform: scale(1.5);
}

.exp-meta {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 4px;
  padding-left: 40px;
}

.exp-date {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--c-text-3);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

.exp-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 100px;
  background: rgba(var(--c-primary-rgb), 0.12);
  color: var(--c-primary);
  width: fit-content;
}
.exp-badge.current {
  background: rgba(var(--c-accent-rgb), 0.12);
  color: var(--c-accent);
}

.exp-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: left;
}

.exp-role {
  font-size: clamp(1.4rem, 2.5vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--c-white);
}
.role-sub {
  display: block;
  font-size: 0.72em;
  font-weight: 500;
  color: var(--c-text-3);
  letter-spacing: 0;
  margin-top: 2px;
}

.exp-company {
  font-size: 0.98rem;
  font-weight: 500;
  color: var(--c-accent);
}

.exp-points {
  padding-left: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 8px;
}
.exp-points li {
  font-size: 0.98rem;
  color: var(--c-text-2);
  line-height: 1.75;
  padding-left: 20px;
  position: relative;
}
.exp-points li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--c-border-hi);
  font-weight: 300;
}
.exp-points strong { color: var(--c-text); font-weight: 600; }

.exp-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.exp-tag {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 100px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--c-border);
  color: var(--c-text-3);
  transition: border-color var(--dur-fast), color var(--dur-fast);
}
.exp-tag:hover {
  border-color: var(--c-border-hi);
  color: var(--c-text-2);
}

/* ═══════════════════════════════════════════════════════════
   05 · PROJECTS
   ═══════════════════════════════════════════════════════════ */
.projects {
  background: var(--c-bg);
}

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

.proj-card {
  background: var(--c-surface-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--dur-med) var(--spring-sm),
              box-shadow var(--dur-med) var(--ease-out),
              border-color var(--dur-med);
  will-change: transform;
}
.proj-card:hover {
  box-shadow: 0 24px 48px rgba(0,0,0,0.5);
  border-color: var(--c-border-hi);
  transform: translateY(-8px);
}
.proj-card:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 2px;
}

.proj-card-inner {
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  height: 100%;
}

.proj-top {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.proj-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--c1, var(--c-primary)), var(--c2, var(--c-accent)));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  opacity: 0.85;
  transition: transform var(--dur-fast) var(--spring-sm);
}
.proj-card:hover .proj-icon { transform: scale(1.08); }

.proj-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.proj-category {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-text-3);
}

.proj-result {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--c-accent);
  background: rgba(var(--c-accent-rgb), 0.1);
  padding: 3px 10px;
  border-radius: 100px;
}

.proj-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--c-white);
}

.proj-desc {
  font-size: 0.93rem;
  color: var(--c-text-2);
  line-height: 1.78;
  flex: 1;
}

.proj-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}
.proj-tags span {
  font-size: 0.76rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--c-border);
  color: var(--c-text-3);
}

/* ═══════════════════════════════════════════════════════════
   06 · CONTACT
   ═══════════════════════════════════════════════════════════ */
.contact {
  background: var(--c-surface);
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.contact-lead {
  font-size: 1.1rem;
  color: var(--c-text-2);
  line-height: 1.75;
  margin-bottom: 40px;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  transition: background var(--dur-fast), transform var(--dur-fast) var(--spring-sm);
}
a.contact-item:hover {
  background: rgba(255,255,255,0.04);
}
a.contact-item:active {
  transform: scale(0.98);
}

.contact-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: var(--c-surface-3);
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-2);
  transition: color var(--dur-fast) var(--ease-out),
              background var(--dur-fast),
              transform var(--dur-fast) var(--spring-sm);
}
a.contact-item:hover .contact-icon {
  background: rgba(var(--c-primary-rgb), 0.12);
  color: var(--c-primary);
  transform: scale(1.06);
}

.contact-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-text-3);
  margin-bottom: 3px;
}

.contact-value {
  display: block;
  font-size: 0.93rem;
  color: var(--c-text);
  font-weight: 500;
}

/* Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--c-text-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.form-input {
  width: 100%;
  padding: 14px 18px;
  font-family: inherit;
  font-size: 0.98rem;
  color: var(--c-text);
  background: var(--c-surface-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  outline: none;
  resize: none;
  transition: border-color var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-med) var(--ease-out),
              background var(--dur-fast);
  -webkit-appearance: none;
  appearance: none;
}
.form-input::placeholder { color: var(--c-text-3); }

.form-input:hover {
  border-color: rgba(var(--c-primary-rgb), 0.25);
}
.form-input:focus {
  border-color: rgba(var(--c-primary-rgb), 0.5);
  background: var(--c-surface-3);
  box-shadow: 0 0 0 4px rgba(var(--c-primary-rgb), 0.1);
}

/* Validation states */
.form-input:user-invalid {
  border-color: rgba(255,77,77,0.5);
  box-shadow: 0 0 0 4px rgba(255,77,77,0.08);
}

.form-textarea {
  min-height: 140px;
}

.form-success {
  text-align: center;
  font-size: 0.93rem;
  color: var(--c-accent);
  padding: 14px;
  border-radius: var(--radius-sm);
  background: rgba(var(--c-accent-rgb), 0.06);
  border: 1px solid rgba(var(--c-accent-rgb), 0.18);
  animation: fadeIn 0.3s var(--ease-out);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ═══════════════════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════════════════ */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--c-border);
  background: var(--c-bg);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-copy, .footer-made {
  font-size: 0.82rem;
  color: var(--c-text-3);
  letter-spacing: 0.01em;
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE — TABLET
   ═══════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  :root { --sp-xl: 80px; --sp-2xl: 120px; }
  .nav { padding: 16px 24px; }
  .nav.scrolled { padding: 10px 24px; }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-portrait { max-width: 360px; }
  .skills-layout { grid-template-columns: 1fr; gap: 48px; }
  .skills-chart { position: static; }
  .proj-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-layout { grid-template-columns: 1fr; gap: 48px; }
  .exp-item { grid-template-columns: 160px 1fr; gap: 40px; }
}

/* MOBILE */
@media (max-width: 768px) {
  :root { --sp-xl: 60px; --sp-2xl: 80px; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .hero-name { font-size: clamp(2.8rem, 14vw, 5.5rem); }
  .section-heading { font-size: clamp(2rem, 8vw, 3.2rem); }
  .proj-grid { grid-template-columns: 1fr; }
  .stats-row { gap: 28px; flex-wrap: wrap; }
  .stat-n { font-size: 2rem; }
  .exp-item {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 40px 0 40px 32px;
  }
  .exp-meta { padding-left: 0; }
  .footer-inner { flex-direction: column; gap: 8px; text-align: center; }
  
  /* Skills Mobile Layout Optimization */
  .skills-layout { gap: 32px; }
  .skills-categories { gap: 28px; }
  .skill-pills { gap: 6px; }
  .pill {
    font-size: 0.75rem;
    padding: 6px 12px;
  }
  .skills-chart canvas {
    margin: 0 auto;
    display: block;
  }
}

@media (max-width: 480px) {
  .container { width: calc(100% - 32px); }
  .hero-cta { flex-direction: column; }
  .hero-cta a { width: 100%; justify-content: center; }
  .contact-item { padding: 14px 12px; }
}

/* ═══════════════════════════════════════════════════════════
   SCROLLBAR — Minimal Chrome
   ═══════════════════════════════════════════════════════════ */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.12);
  border-radius: 100px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255,255,255,0.2);
}
[data-theme="light"]::-webkit-scrollbar-thumb {
  background: rgba(0,0,0,0.12);
}
[data-theme="light"]::-webkit-scrollbar-thumb:hover {
  background: rgba(0,0,0,0.25);
}

/* Firefox scrollbar */
html {
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.12) transparent;
}
[data-theme="light"] {
  scrollbar-color: rgba(0,0,0,0.12) transparent;
}