/* ============================================================
   ChankArts Official Website — Style
   Mobile-first, dark theme, minimal, premium
   ============================================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-bg: #0a0a0c;
  --color-bg-alt: #111114;
  --color-bg-card: #16161a;
  --color-surface: #1c1c21;
  --color-text: #e8e6e3;
  --color-text-muted: #8a8a8f;
  --color-accent: #c9a96e;
  --color-accent-soft: rgba(201, 169, 110, 0.12);
  --color-border: rgba(255, 255, 255, 0.06);
  --color-white: #ffffff;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", monospace;
  --max-width: 1200px;
  --nav-height: 64px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul { list-style: none; }

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

@media (min-width: 768px) {
  .container { padding: 0 40px; }
}

/* --- Section --- */
.section {
  padding: 56px 0;
  position: relative;
}

.section--dark {
  background: var(--color-bg-alt);
}

.section--brand {
  background: linear-gradient(135deg, var(--color-bg-alt) 0%, #1a1510 100%);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section__label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.section__header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 16px;
}

.section__logo {
  width: 80px;
  height: 80px;
  border-radius: 16px;
  object-fit: contain;
  flex-shrink: 0;
}

@media (max-width: 480px) {
  .section__logo {
    width: 60px;
    height: 60px;
    border-radius: 12px;
  }
}

.section__title {
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 16px;
  color: var(--color-white);
}

.section__subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin-bottom: 48px;
  line-height: 1.7;
}

.section__note {
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 32px;
  opacity: 0.6;
}

.section__cta {
  text-align: center;
  margin-top: 48px;
}

@media (min-width: 768px) {
  .section { padding: 80px 0; }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: all 0.3s var(--ease);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-accent);
  color: #0a0a0c;
}

.btn--primary:hover {
  background: #d4b67a;
  transform: translateY(-1px);
}

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(10, 10, 12, 0.85);
  border-bottom: 1px solid var(--color-border);
  transition: background 0.3s var(--ease);
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-white);
}

.nav__logo svg {
  color: var(--color-accent);
}

.nav__toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: all 0.3s var(--ease);
  transform-origin: center;
}

.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);
}

.nav__links {
  position: fixed;
  top: 0;
  right: -100%;
  width: 280px;
  height: 100vh;
  height: 100dvh;
  background: var(--color-bg-alt);
  padding: 100px 32px 40px;
  display: flex;
  flex-direction: column;
  gap: 0;
  transition: right 0.4s var(--ease);
  border-left: 1px solid var(--color-border);
  z-index: 1000;
}

.nav__links--open {
  right: 0;
}

.nav__backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  -webkit-tap-highlight-color: transparent;
}

.nav__backdrop--visible {
  display: block;
}

.nav__links li a {
  display: block;
  padding: 14px 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color 0.2s;
  border-bottom: 1px solid var(--color-border);
}

.nav__links li a:hover,
.nav__links li a.active {
  color: var(--color-accent);
}

@media (min-width: 768px) {
  .nav__toggle { display: none; }
  .nav__links {
    position: static;
    width: auto;
    height: auto;
    background: none;
    padding: 0;
    flex-direction: row;
    gap: 0;
    border: none;
  }
  .nav__links li a {
    padding: 8px 16px;
    font-size: 0.85rem;
    border: none;
  }
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-height) + 40px) 24px 60px;
  overflow: hidden;
}

.hero__content {
  position: relative;
  text-align: center;
  max-width: 720px;
}

.hero__title {
  font-size: clamp(3rem, 12vw, 7rem);
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1;
  color: var(--color-white);
  margin-bottom: 16px;
}

.hero__tagline {
  font-size: clamp(0.85rem, 2.5vw, 1.15rem);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 24px;
}

.hero__statement {
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  color: var(--color-text-muted);
  max-width: 520px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero__cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

@media (min-width: 768px) {
  .hero {
    padding: calc(var(--nav-height) + 80px) 40px 80px;
  }
}

/* --- Timeline --- */
.story__timeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 48px;
}

@media (min-width: 600px) {
  .story__timeline { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 900px) {
  .story__timeline { grid-template-columns: repeat(5, 1fr); }
}

.timeline__item {
  padding: 28px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  border-top: 2px solid var(--color-accent);
}

.timeline__year {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 10px;
  font-family: var(--font-mono);
}

.timeline__title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 8px;
}

.timeline__desc {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.story__hashtag {
  text-align: center;
  margin-top: 48px;
  font-size: 1rem;
  color: var(--color-accent);
  font-weight: 600;
  letter-spacing: 0.05em;
}

/* --- Grid --- */
.grid {
  display: grid;
  gap: 24px;
}

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

@media (min-width: 600px) {
  .grid--2 { grid-template-columns: 1fr 1fr; }
  .grid--3 { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 900px) {
  .grid--3 { grid-template-columns: 1fr 1fr 1fr; }
}

/* --- Cards --- */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.card:hover {
  border-color: rgba(201, 169, 110, 0.25);
  transform: translateY(-2px);
}

/* Video Card */
.card--video .card__thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-surface);
}

.card--video .card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card__play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.35);
  border: none;
  cursor: pointer;
  transition: background 0.3s;
}

.card__play:hover {
  background: rgba(0, 0, 0, 0.55);
}

.card__play svg {
  transition: transform 0.3s var(--ease);
}

.card__play:hover svg {
  transform: scale(1.1);
}

/* Video Link Card */
.card--video-link {
  display: flex;
  align-items: center;
  justify-content: center;
}

.card__link-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 40px 24px;
  text-align: center;
  color: var(--color-text-muted);
  transition: color 0.3s;
  width: 100%;
}

.card__link-visual:hover {
  color: var(--color-accent);
}

.card__link-visual .card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-white);
}

.card__link-visual .card__desc {
  font-size: 0.85rem;
}

.card__body {
  padding: 20px;
}

.card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 6px;
}

.card__desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Feature Card (Academy) */
.card--feature {
  padding: 28px;
}

.card__icon {
  color: var(--color-accent);
  margin-bottom: 16px;
}

/* Product Card */
.card--product {
  padding: 24px;
}

.card__badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 14px;
}

.card__link {
  display: inline-block;
  margin-top: 14px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  transition: opacity 0.2s;
}

.card__link:hover { opacity: 0.7; }

/* Project Card */
.card--project {
  padding: 32px;
  text-align: center;
}

.card__visual {
  color: var(--color-accent);
  margin-bottom: 20px;
}

.card--project .card__title {
  font-size: 1.05rem;
}

/* --- Featured Story --- */
.featured-story {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 48px;
  padding: 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

@media (min-width: 768px) {
  .featured-story {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    padding: 40px;
  }
}

.featured-story__video .card {
  background: none;
  border: none;
}

.featured-story__title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-white);
  margin: 12px 0 16px;
  letter-spacing: 0.04em;
}

.featured-story__desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.featured-story__quote {
  font-size: 1.05rem;
  color: var(--color-accent);
  font-style: italic;
  line-height: 1.7;
  margin: 16px 0;
  padding-left: 16px;
  border-left: 2px solid var(--color-accent);
}

/* --- Philosophy --- */
.philosophy {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
  padding: 40px 0;
}

.philosophy__title {
  font-size: clamp(1.75rem, 5vw, 3rem);
  font-weight: 800;
  color: var(--color-white);
  margin: 16px 0 24px;
  line-height: 1.15;
}

.philosophy__text {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 32px;
}

.philosophy__hashtag {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.05em;
}

/* --- Contact --- */
.contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 40px;
}

@media (min-width: 600px) {
  .contact { grid-template-columns: 1fr 1fr; }
}

.contact__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.contact__link {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-accent);
  transition: opacity 0.2s;
  word-break: break-all;
}

.contact__link:hover { opacity: 0.7; }

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

.contact__music-links .contact__link {
  font-size: 0.95rem;
}

/* --- Footer --- */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}

@media (min-width: 768px) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer__logo {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-white);
}

.footer__tagline {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.footer__links {
  display: flex;
  gap: 20px;
}

.footer__links a {
  color: var(--color-text-muted);
  transition: color 0.2s;
}

.footer__links a:hover { color: var(--color-accent); }

.footer__copy {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  opacity: 0.5;
}

/* --- Scroll Reveal (JS-driven) --- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- YouTube Facade --- */
.card--video .card__iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: none;
}

/* --- Skip Link (Accessibility) --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  padding: 12px 24px;
  background: var(--color-accent);
  color: #0a0a0c;
  font-weight: 600;
  border-radius: 4px;
  z-index: 10000;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 16px;
}

/* --- Focus Visible --- */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* --- Selection --- */
::selection {
  background: var(--color-accent);
  color: #0a0a0c;
}