/* ========================================
   EELSOMA — Amos Lee
   Trumpeter · Conductor · Educator
   ======================================== */

/* --- Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500&family=Inter:wght@300;400;500;600&family=Noto+Sans+TC:wght@300;400;500;700&display=swap');

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

:root {
  --black: #1a1a1a;
  --white: #f5f0eb;
  --gold: #c9a96e;
  --gold-light: #dfc69e;
  --gray: #888888;
  --gray-light: #b0b0b0;
  --gray-dark: #333333;
  --bg-dark: #111111;
  --bg-section: #f8f5f1;
  --font-display: 'Playfair Display', 'Noto Sans TC', serif;
  --font-body: 'Inter', 'Noto Sans TC', sans-serif;
  --font-cn: 'Noto Sans TC', sans-serif;
  --transition: 0.3s ease;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--black);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--gold); }

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.2;
}

h1 { font-size: clamp(2.2rem, 5vw, 4rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.6rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }

.text-gold { color: var(--gold); }
.text-gray { color: var(--gray); }
.text-center { text-align: center; }

.en { font-family: 'Inter', sans-serif; }
.zh { font-family: 'Noto Sans TC', sans-serif; }

/* --- Layout --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 4vw, 4rem);
}

section {
  padding: clamp(4rem, 8vw, 8rem) 0;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1.2rem 0;
  transition: background var(--transition), padding var(--transition);
}

.nav.scrolled {
  background: rgba(17, 17, 17, 0.95);
  backdrop-filter: blur(10px);
  padding: 0.8rem 0;
}

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

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--white);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color var(--transition);
}

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

.nav-lang {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.nav-lang button {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.8rem;
  cursor: pointer;
  font-family: var(--font-body);
  padding: 0.2rem 0.4rem;
  transition: color var(--transition);
}

.nav-lang button.active {
  color: var(--gold);
}

.nav-lang button:hover {
  color: var(--white);
}

.nav-lang span {
  color: rgba(255, 255, 255, 0.2);
  font-size: 0.7rem;
}

/* Mobile hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  margin: 5px 0;
  transition: var(--transition);
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--bg-dark);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.45;
  filter: grayscale(30%);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: linear-gradient(135deg, rgba(17,17,17,0.8) 0%, rgba(17,17,17,0.3) 60%, transparent 100%);
}

.hero-content {
  position: relative;
  z-index: 3;
  padding: 0 clamp(2rem, 5vw, 6rem);
  max-width: 700px;
}

.hero-content h1 {
  color: var(--white);
  margin-bottom: 1rem;
  font-weight: 400;
}

.hero-content .hero-subtitle {
  color: var(--gold);
  font-family: var(--font-body);
  font-size: clamp(0.85rem, 1.5vw, 1rem);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  font-weight: 300;
}

.hero-content .hero-tagline {
  color: rgba(255, 255, 255, 0.65);
  font-size: clamp(1rem, 2vw, 1.15rem);
  line-height: 1.8;
  max-width: 500px;
  font-weight: 300;
}

.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
}

.hero-scroll .line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.4), transparent);
}

/* --- Section Headers --- */
.section-header {
  margin-bottom: clamp(3rem, 5vw, 5rem);
}

.section-header .label {
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1rem;
  font-weight: 500;
}

.section-header h2 {
  margin-bottom: 1rem;
}

.section-header .desc {
  color: var(--gray);
  max-width: 500px;
  font-size: 0.95rem;
  line-height: 1.8;
}

/* --- Section variants --- */
.section-dark {
  background: var(--bg-dark);
  color: var(--white);
}

.section-dark .section-header .desc {
  color: var(--gray-light);
}

.section-warm {
  background: var(--bg-section);
}

/* --- About Intro (Homepage) --- */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 4vw, 5rem);
  align-items: center;
}

.about-intro-img {
  position: relative;
}

.about-intro-img img {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
  object-position: top center;
  filter: grayscale(20%);
}

.about-intro-img::after {
  content: '';
  position: absolute;
  bottom: -1rem;
  right: -1rem;
  width: 60%;
  height: 60%;
  border: 1px solid var(--gold);
  z-index: -1;
  opacity: 0.3;
}

.about-intro-text .name {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  margin-bottom: 0.5rem;
}

.about-intro-text .role {
  color: var(--gold);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 2rem;
  font-weight: 400;
}

.about-intro-text p {
  color: var(--gray-dark);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
  line-height: 1.9;
}

.about-intro-text .btn {
  display: inline-block;
  margin-top: 0.5rem;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 0.9rem 2.2rem;
  font-family: var(--font-body);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  border: 1px solid var(--black);
  color: var(--black);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition);
}

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

.btn-light {
  border-color: var(--white);
  color: var(--white);
}

.btn-light:hover {
  background: var(--white);
  color: var(--black);
}

.btn-gold {
  border-color: var(--gold);
  color: var(--gold);
}

.btn-gold:hover {
  background: var(--gold);
  color: var(--black);
}

/* --- Gallery Grid --- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.gallery-item img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s ease, filter 0.6s ease;
  filter: grayscale(15%);
}

.gallery-item:hover img {
  transform: scale(1.05);
  filter: grayscale(0%);
}

.gallery-item-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(17,17,17,0.7) 0%, transparent 50%);
  display: flex;
  align-items: flex-end;
  padding: 1.5rem;
  opacity: 1;
  transition: opacity var(--transition);
}

.gallery-item:hover .gallery-item-overlay {
  opacity: 1;
}

.gallery-item-overlay h3 {
  color: var(--white);
  font-size: 1rem;
  font-weight: 500;
}

.gallery-item-overlay span {
  display: block;
  color: var(--gold);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 0.3rem;
}

/* --- Masonry variant --- */
.gallery-masonry {
  columns: 2;
  column-gap: 1.5rem;
}

.gallery-masonry .gallery-item {
  break-inside: avoid;
  margin-bottom: 1.5rem;
}

/* --- Stats --- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 2rem;
  padding: 3rem 0;
}

.stat {
  text-align: center;
}

.stat-number {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--gold);
  font-weight: 400;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--gray-light);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 0.5rem;
}

/* --- Teaching Cards --- */
.teaching-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.teaching-card {
  background: var(--bg-section);
  padding: 2.5rem;
  border-left: 2px solid var(--gold);
  transition: transform var(--transition);
}

.teaching-card:hover {
  transform: translateY(-4px);
}

.teaching-card h3 {
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.teaching-card p {
  color: var(--gray-dark);
  font-size: 0.9rem;
  line-height: 1.8;
}

/* --- Instruments list --- */
.instruments {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.instrument-tag {
  padding: 0.5rem 1.2rem;
  border: 1px solid var(--gray);
  font-size: 0.8rem;
  color: var(--gray-dark);
  letter-spacing: 0.05em;
  transition: all var(--transition);
}

.instrument-tag:hover {
  border-color: var(--gold);
  color: var(--gold);
}

/* --- Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 4vw, 5rem);
}

.contact-info h3 {
  margin-bottom: 2rem;
}

.contact-item {
  margin-bottom: 2rem;
}

.contact-item .label {
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.contact-item a,
.contact-item p {
  font-size: 1.05rem;
  color: var(--white);
}

.contact-item a:hover {
  color: var(--gold);
}

.social-links {
  display: flex;
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.social-links a {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.social-links a:hover {
  color: var(--gold);
}

/* --- Footer --- */
.footer {
  background: var(--bg-dark);
  padding: 2rem 0;
  text-align: center;
}

.footer p {
  color: rgba(255, 255, 255, 0.3);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.footer a {
  color: rgba(255, 255, 255, 0.5);
}

.footer a:hover {
  color: var(--gold);
}

/* --- Page Header (sub pages) --- */
.page-header {
  background: var(--bg-dark);
  padding: clamp(6rem, 12vw, 10rem) 0 clamp(3rem, 6vw, 5rem);
  position: relative;
  overflow: hidden;
}

.page-header-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.page-header-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  filter: grayscale(50%);
}

.page-header-content {
  position: relative;
  z-index: 2;
}

.page-header .label {
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1rem;
  font-weight: 500;
}

.page-header h1 {
  color: var(--white);
}

.page-header .desc {
  color: rgba(255, 255, 255, 0.5);
  margin-top: 1rem;
  font-size: 0.95rem;
  max-width: 500px;
  line-height: 1.8;
}

/* --- CTA Section --- */
.cta-section {
  background: var(--bg-dark);
  text-align: center;
  padding: clamp(4rem, 8vw, 7rem) 0;
}

.cta-section h2 {
  color: var(--white);
  margin-bottom: 1rem;
}

.cta-section p {
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

/* --- About Page --- */
.about-story {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}

.about-story-img img {
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
  object-position: top center;
  filter: grayscale(20%);
}

.about-story-text p {
  color: var(--gray-dark);
  margin-bottom: 1.5rem;
  line-height: 1.9;
  font-size: 0.95rem;
}

.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.philosophy-item {
  padding: 2.5rem;
  border: 1px solid rgba(201, 169, 110, 0.15);
}

.philosophy-item .num {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--gold);
  opacity: 0.4;
  margin-bottom: 1rem;
}

.philosophy-item h3 {
  margin-bottom: 1rem;
}

.philosophy-item p {
  color: var(--gray-dark);
  font-size: 0.9rem;
  line-height: 1.8;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(17, 17, 17, 0.98);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    font-size: 1.1rem;
    color: var(--white);
  }

  .nav-toggle {
    display: block;
    z-index: 1001;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .about-intro {
    grid-template-columns: 1fr;
  }

  .about-intro-img::after {
    display: none;
  }

  .about-story {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .gallery-masonry {
    columns: 1;
  }

  .hero-content {
    padding: 0 clamp(1.5rem, 4vw, 3rem);
  }
}

/* --- Utilities --- */
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

/* --- Fade in animation --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}