/* ==========================================================================
   LE HIEP STUDIO — Design tokens
   ========================================================================== */
:root,
[data-theme="dark"] {
  color-scheme: dark;
  --color-bg: #0a0a0a;
  --color-bg-rgb: 10, 10, 10;
  --color-surface: #151515;
  --color-surface-2: #1d1d1d;
  --color-border: #2b2b2b;
  --color-hairline: rgba(255, 255, 255, 0.06);
  --color-text: #f5f3ee;
  --color-text-rgb: 245, 243, 238;
  --color-text-muted: #a8a29a;
  --color-accent: #cda45e;
  --color-accent-strong: #e3bd7a;
  --color-accent-text: #cda45e;
  --color-danger: #e05252;
  --color-success: #7cc48a;
  --icon-sun-display: none;
  --icon-moon-display: block;
}

[data-theme="light"] {
  color-scheme: light;
  --color-bg: #faf8f4;
  --color-bg-rgb: 250, 248, 244;
  --color-surface: #ffffff;
  --color-surface-2: #f2ede2;
  --color-border: #e4ddd0;
  --color-hairline: rgba(0, 0, 0, 0.08);
  --color-text: #1c1917;
  --color-text-rgb: 28, 25, 23;
  --color-text-muted: #6b6459;
  --color-accent: #cda45e;
  --color-accent-strong: #e3bd7a;
  --color-accent-text: #8a651f;
  --color-danger: #b3261e;
  --color-success: #2f8f52;
  --icon-sun-display: block;
  --icon-moon-display: none;
}

:root {
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;
  --space-9: 128px;

  --container-w: 1240px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-full: 999px;

  --ease-out: cubic-bezier(.16,1,.3,1);
  --dur-fast: 180ms;
  --dur-base: 280ms;
}

@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;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { min-height: 100dvh; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--dur-base) var(--ease-out), color var(--dur-base) var(--ease-out);
}

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

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

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.1;
  margin: 0;
}

p { margin: 0 0 var(--space-3); }

.container {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 768px) {
  .container { padding-inline: var(--space-6); }
}

:focus-visible {
  outline: 2px solid var(--color-accent-text);
  outline-offset: 3px;
}

.eyebrow {
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent-text);
  margin-bottom: var(--space-3);
}
.eyebrow.center { text-align: center; }

.section-title {
  font-size: clamp(28px, 4vw, 44px);
  margin-bottom: var(--space-3);
}
.section-title.center { text-align: center; }

.section-sub {
  color: var(--color-text-muted);
  max-width: 560px;
}
.section-sub.center { margin-inline: auto; text-align: center; margin-bottom: var(--space-6); }

/* Buttons -------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  padding: 0 var(--space-5);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
  touch-action: manipulation;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--color-accent);
  color: #171310;
}
.btn-primary:hover { background: var(--color-accent-strong); }

.btn-outline {
  background: transparent;
  border-color: rgba(var(--color-text-rgb), 0.35);
  color: var(--color-text);
}
.btn-outline:hover { border-color: var(--color-text); }

.btn-block { width: 100%; }

.btn-zalo { margin-top: var(--space-4); }

/* Theme toggle ------------------------------------------------------------*/
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.theme-toggle:hover { border-color: var(--color-accent-text); }
.theme-toggle:active { transform: scale(0.94); }
.theme-toggle .icon-sun { display: var(--icon-sun-display); }
.theme-toggle .icon-moon { display: var(--icon-moon-display); }

/* Header ----------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(var(--color-bg-rgb), 0.72);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-hairline);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.brand span { color: var(--color-accent-text); }

.main-nav {
  display: none;
  gap: var(--space-5);
}
.main-nav a {
  font-size: 14px;
  color: var(--color-text-muted);
  transition: color var(--dur-fast) var(--ease-out);
}
.main-nav a:hover { color: var(--color-text); }

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header-cta { display: none; }

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
  margin-inline: auto;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (min-width: 1024px) {
  .main-nav { display: flex; }
  .header-cta { display: inline-flex; height: 42px; min-height: 42px; }
  .nav-toggle { display: none; }
}

.mobile-nav {
  background: var(--color-bg);
  border-top: 1px solid var(--color-hairline);

  max-height: 0;
  overflow: hidden;
  transition: max-height var(--dur-base) var(--ease-out);
}
.mobile-nav-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-4) var(--space-6);
}
.mobile-nav.open { max-height: 400px; }
.mobile-nav a { font-size: 16px; }
.mobile-nav .btn { align-self: flex-start; margin-top: var(--space-2); }

@media (min-width: 1024px) {
  .mobile-nav { display: none; }
}

/* Hero --------------------------------------------------------------------*/
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-scrim {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(10,10,10,0.55) 0%, rgba(10,10,10,0.35) 40%, rgba(10,10,10,0.92) 100%),
    linear-gradient(90deg, rgba(10,10,10,0.85) 0%, rgba(10,10,10,0.25) 65%);
}

.hero-content {
  position: relative;
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
  color: #f5f3ee;
}
.hero-content .eyebrow { color: #cda45e; }
.hero-actions .btn-outline {
  border-color: rgba(245, 243, 238, 0.4);
  color: #f5f3ee;
}
.hero-actions .btn-outline:hover { border-color: #f5f3ee; }

.hero-title {
  font-size: clamp(32px, 8vw, 92px);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-4);
}

.hero-sub {
  max-width: 520px;
  font-size: clamp(15px, 2vw, 18px);
  color: rgba(245,243,238,0.85);
  margin-bottom: var(--space-5);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.scroll-cue {
  position: absolute;
  bottom: var(--space-5);
  left: 50%;
  transform: translateX(-50%);
  width: 26px;
  height: 42px;
  border: 2px solid rgba(245,243,238,0.4);
  border-radius: var(--radius-full);
  display: none;
}
.scroll-cue span {
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-accent);
  animation: scrollcue 1.8s ease-in-out infinite;
}
@keyframes scrollcue {
  0% { opacity: 1; top: 6px; }
  100% { opacity: 0; top: 20px; }
}
@media (min-width: 768px) {
  .scroll-cue { display: block; }
}

/* Trust bar -----------------------------------------------------------*/
.trust-bar {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}
.trust-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  padding-block: var(--space-6);
}
.trust-item { text-align: center; }
.trust-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  color: var(--color-accent-text);
  margin-bottom: var(--space-1);
}
.trust-item span {
  font-size: 13px;
  color: var(--color-text-muted);
}
@media (min-width: 640px) {
  .trust-inner { grid-template-columns: repeat(3, 1fr); }
}

/* About ---------------------------------------------------------------*/
.about { padding-block: var(--space-8); }
.about-grid {
  display: grid;
  gap: var(--space-6);
}
.about-media img {
  border-radius: var(--radius-md);
  aspect-ratio: 9 / 11;
  object-fit: cover;
}
.about-copy h2 { margin-bottom: var(--space-4); font-size: clamp(28px, 4vw, 40px); }
.about-copy p:not(.eyebrow) { color: var(--color-text-muted); }
.link-underline {
  display: inline-block;
  margin-top: var(--space-2);
  color: var(--color-accent-text);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-fast) var(--ease-out);
}
.link-underline:hover { border-color: var(--color-accent-text); }

@media (min-width: 1024px) {
  .about-grid {
    grid-template-columns: 0.8fr 1fr;
    align-items: center;
  }
}

/* Services --------------------------------------------------------------*/
.services { padding-block: var(--space-8); background: var(--color-surface); }
.services-grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}
.service-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  transition: border-color var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
.service-card:hover {
  border-color: var(--color-accent-text);
  transform: translateY(-4px);
}
.service-index {
  display: block;
  font-family: var(--font-display);
  color: var(--color-accent-text);
  font-size: 24px;
  margin-bottom: var(--space-3);
}
.service-card h3 { font-size: 19px; margin-bottom: var(--space-2); }
.service-card p { color: var(--color-text-muted); font-size: 14px; margin-bottom: 0; }

@media (min-width: 640px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .services-grid { grid-template-columns: repeat(4, 1fr); }
}

/* Portfolio ---------------------------------------------------------------*/
.portfolio { padding-block: var(--space-8); }
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}
.portfolio-item {
  position: relative;
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
}
.portfolio-item img {
  width: 100%;
  height: 100%;
  aspect-ratio: 7 / 9;
  object-fit: cover;
  transition: transform var(--dur-base) var(--ease-out);
}
.portfolio-item:hover img { transform: scale(1.05); }
.portfolio-item figcaption {
  position: absolute;
  left: var(--space-3);
  bottom: var(--space-3);
  font-size: 13px;
  padding: var(--space-1) var(--space-3);
  background: rgba(10,10,10,0.6);
  backdrop-filter: blur(4px);
  border-radius: var(--radius-full);
}

@media (min-width: 768px) {
  .portfolio-grid { grid-template-columns: repeat(4, 1fr); }
}

/* Contact -----------------------------------------------------------------*/
.contact { padding-block: var(--space-8); background: var(--color-surface); }
.contact-grid {
  display: grid;
  gap: var(--space-6);
}
.contact-info h2 { font-size: clamp(28px, 4vw, 40px); margin-bottom: var(--space-4); }
.contact-info p:not(.eyebrow) { color: var(--color-text-muted); }

.contact-list {
  list-style: none;
  margin: var(--space-5) 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.contact-list li {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-2);
  font-size: 14px;
}
.contact-list span { color: var(--color-text-muted); }
.contact-list a { font-weight: 600; }

.contact-form {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.field { display: flex; flex-direction: column; gap: var(--space-2); }
.field label { font-size: 13px; color: var(--color-text-muted); }
.field input,
.field select,
.field textarea {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  padding: 12px 14px;
  font-family: var(--font-body);
  font-size: 16px;
  min-height: 48px;
  transition: border-color var(--dur-fast) var(--ease-out);
}
.field textarea { min-height: 88px; resize: vertical; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--color-accent-text);
  outline: none;
}
.field-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.form-status {
  min-height: 20px;
  font-size: 14px;
  margin: 0;
}
.form-status[data-state="ok"] { color: var(--color-success); }
.form-status[data-state="err"] { color: var(--color-danger); }

@media (min-width: 1024px) {
  .contact-grid { grid-template-columns: 1fr 1fr; align-items: start; }
}

/* Footer --------------------------------------------------------------*/
.site-footer { padding-block: var(--space-6); }
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}
.footer-brand p { color: var(--color-text-muted); font-size: 13px; margin: var(--space-1) 0 0; }
.footer-links {
  display: flex;
  gap: var(--space-4);
  font-size: 14px;
}
.footer-links a:hover { color: var(--color-accent-text); }
.footer-bottom {
  padding-top: var(--space-4);
  font-size: 12px;
  color: var(--color-text-muted);
}

@media (min-width: 768px) {
  .footer-inner { flex-direction: row; justify-content: space-between; align-items: center; }
}

/* Floating Zalo button --------------------------------------------------*/
.zalo-float {
  position: fixed;
  right: var(--space-4);
  bottom: var(--space-4);
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--color-accent);
  color: #171310;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  z-index: 90;
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 8px 24px rgba(0,0,0,0.4), 0 0 0 0 rgba(205,164,94,0.5); }
  50% { box-shadow: 0 8px 24px rgba(0,0,0,0.4), 0 0 0 10px rgba(205,164,94,0); }
}

/* Not found -------------------------------------------------------------*/
.not-found {
  min-height: 60dvh;
  display: flex;
  align-items: center;
}
.not-found h1 { font-size: clamp(32px, 5vw, 56px); margin-bottom: var(--space-3); }
.not-found p:not(.eyebrow) { color: var(--color-text-muted); margin-bottom: var(--space-5); }

/* Scroll reveal ---------------------------------------------------------*/
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 600ms var(--ease-out), transform 600ms var(--ease-out);
  transition-delay: calc(var(--i, 0) * 60ms);
}
.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}