/* Sina Fonts @font-face */
@font-face {
  font-family: 'SinaQianXiTi';
  src: url('../ziti/新浪倩细体/SinaQianXiTi.ttf') format('truetype');
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'SinaWeiKaiTi';
  src: url('../ziti/新浪巍楷体/SinaWeiKaiTi.ttf') format('truetype');
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'SinaYueSongTi';
  src: url('../ziti/新浪悦宋体/ttf格式/SinaYueSongTi-Regular.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'SinaYueSongTi';
  src: url('../ziti/新浪悦宋体/ttf格式/SinaYueSongTi-SemiBold.ttf') format('truetype');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'SinaYueSongTi';
  src: url('../ziti/新浪悦宋体/ttf格式/SinaYueSongTi-Bold.ttf') format('truetype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'SinaYanBianTi';
  src: url('../ziti/新浪演变体/可变字体/SinaYanBianTiVF.ttf') format('truetype');
  font-weight: 0 100;
  font-style: oblique 0deg 100deg;
  font-display: swap;
}

/* Base font updates */
.font-qianxi {
  font-family: 'SinaQianXiTi', var(--font-sans);
}

.font-weikai {
  font-family: 'SinaWeiKaiTi', var(--font-serif);
}

.font-yuesong {
  font-family: 'SinaYueSongTi', var(--font-serif);
}

.font-yanbian {
  font-family: 'SinaYanBianTi', var(--font-sans);
}

/* Live Preview Input */
.preview-input {
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 1.5rem;
  padding: 0.5rem 0;
  width: 100%;
  margin: 1.5rem 0;
  outline: none;
  transition: border-color 0.3s;
}

.preview-input:focus {
  border-bottom-color: var(--text-primary);
}

.preview-input::placeholder {
  color: var(--text-muted);
}

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Playfair+Display:ital,wght@0,400;0,600;1,400&family=Space+Mono&display=swap');

:root {
  /* Ultra Premium Dark Palette */
  --bg-color: #0a0a0c;
  --bg-surface: #121216;
  --bg-elevated: #1a1a1f;

  --text-primary: #ffffff;
  --text-secondary: #8a8f98;
  --text-muted: #5e6269;

  --border-subtle: rgba(255, 255, 255, 0.1);
  --border-focus: rgba(255, 255, 255, 0.3);

  --accent: #ffffff;
  /* Monochromatic premium feel */
  --accent-secondary: #6c78e6;
  /* Very subtle pop if needed */

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-mono: 'Space Mono', monospace;

  --nav-height: 100px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-primary);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
  overflow-x: hidden;
}

::selection {
  background: var(--text-primary);
  color: var(--bg-color);
}

/* Typography Base */
h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.02em;
}

p {
  margin: 0;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.text-secondary {
  color: var(--text-secondary);
}

/* Header / Nav */
.foundry-header {
  height: var(--nav-height);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 5vw;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 12, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}

.foundry-header.scrolled {
  border-bottom: 1px solid var(--border-subtle);
}

.logo {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 3rem;
  align-items: center;
}

.nav-link {
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-secondary);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 5vw;
  position: relative;
  padding-top: var(--nav-height);
  overflow: hidden;
  /* Hide the overflow of the massive glyph */
}

.hero-interactive-glyph {
  position: absolute;
  top: 50%;
  right: -10vw;
  transform: translateY(-50%);
  font-size: 60vw;
  color: var(--text-primary);
  opacity: 0.03;
  z-index: -1;
  pointer-events: none;
  user-select: none;
  line-height: 1;
  transition: font-variation-settings 0.1s linear, filter 0.3s ease;
  will-change: font-variation-settings, filter;
}

@media (max-width: 900px) {
  .hero-interactive-glyph {
    font-size: 100vw;
    right: -20vw;
    opacity: 0.02;
  }
}

.hero-title {
  font-size: clamp(4rem, 8vw, 8rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.04em;
  max-width: 90vw;
  margin-bottom: 2rem;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.5;
  margin-bottom: 3rem;
}

/* Buttons */
.btn-premium {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--text-primary);
  color: var(--bg-color);
  padding: 1rem 2rem;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 2px;
  /* Very slight rounding for industrial feel */
  cursor: pointer;
}

.btn-premium:hover {
  background: transparent;
  color: var(--text-primary);
  box-shadow: inset 0 0 0 1px var(--text-primary);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--text-primary);
  padding: 1rem 2rem;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 2px;
  box-shadow: inset 0 0 0 1px var(--border-focus);
}

.btn-outline:hover {
  box-shadow: inset 0 0 0 1px var(--text-primary);
}

/* Typeface Showcase Section */
.showcases {
  border-top: 1px solid var(--border-subtle);
}

.showcase-row {
  display: flex;
  min-height: 800px;
  height: auto;
  border-bottom: 1px solid var(--border-subtle);
}

/* Left: Massive letter display */
.showcase-left {
  flex: 1 1 55%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem; /* Increased padding to prevent overflow */
  border-right: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  position: relative;
  overflow: hidden;
  transition: background 0.5s ease;
}

.showcase-row:hover .showcase-left {
  background: var(--bg-elevated);
}

.massive-letter {
  font-size: clamp(150px, 30vw, 500px); /* Slightly reduced max size to fit better */
  line-height: 1.2; /* Increased line-height to prevent vertical overlap */
  color: var(--text-primary);
  user-select: none;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  word-break: break-all;
  white-space: pre-wrap;
  text-align: center;
  max-width: 100%;
  padding: 1rem; /* Add internal padding */
}

.massive-letter.paragraph-mode {
  font-size: clamp(2rem, 5vw, 4rem);
  text-align: left;
  line-height: 1.4;
  word-break: normal;
  padding: 4rem;
}

.showcase-row:hover .massive-letter:not(.paragraph-mode) {
  transform: scale(1.05);
}

/* Apply specific fonts to letters */
.font-sans-display {
  font-family: var(--font-sans);
  font-weight: 700;
  letter-spacing: -0.05em;
}

.font-serif-display {
  font-family: var(--font-serif);
  font-weight: 400;
  font-style: italic;
}

.font-mono-display {
  font-family: var(--font-mono);
  font-weight: 400;
}

/* Right: Typography Details */
.showcase-right {
  flex: 1 1 45%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4rem;
  padding: 6vw 8vw;
}

.showcase-info-top {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.font-name {
  font-size: clamp(2.5rem, 4vw, 4rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.font-yanbian.font-name {
  font-weight: 400;
}

.font-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 450px;
}

.font-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-primary);
  margin-top: 1rem;
}

.showcase-info-bottom {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Footer Minimalist */
.foundry-footer {
  padding: 8vw 5vw 4vw;
  background: #000;
}

.footer-huge {
  font-size: clamp(3rem, 10vw, 12rem);
  font-weight: 700;
  letter-spacing: -0.05em;
  text-align: center;
  line-height: 0.8;
  margin-bottom: 6vw;
  color: var(--text-primary);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 6vw;
  padding-top: 4vw;
  border-top: 1px solid var(--border-subtle);
}

.footer-col h4 {
  font-size: 1rem;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-col a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-col a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-family: var(--font-mono);
}

/* Multi-Font Grid Layout */
.font-grid-section {
  padding: 8vw 5vw;
  border-top: 1px solid var(--border-subtle);
}

.grid-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 4rem;
}

.grid-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 500;
  letter-spacing: -0.02em;
}

.grid-count {
  font-family: var(--font-mono);
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding-bottom: 0.5rem;
}

.font-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1px;
  background: var(--border-subtle);
  border: 1px solid var(--border-subtle);
}

.grid-item {
  background: var(--bg-surface);
  padding: 3rem;
  display: flex;
  flex-direction: column;
  transition: background 0.3s ease;
  cursor: pointer;
}

.grid-item:hover {
  background: var(--bg-elevated);
}

.grid-letter {
  font-size: 8rem;
  line-height: 1;
  color: var(--text-primary);
  margin-bottom: 3rem;
  transition: transform 0.3s ease;
}

.grid-item:hover .grid-letter {
  transform: translateY(-5px);
}

.grid-info h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.grid-info p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

.grid-meta {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
  padding-top: 1rem;
}

.grid-meta-price {
  color: var(--text-primary);
  font-weight: 600;
}

/* Responsive Overrides */
@media (max-width: 900px) {
  .showcase-row {
    flex-direction: column;
    height: auto;
  }

  .showcase-left {
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
    padding: 20vw 0;
    flex: none;
  }

  .showcase-right {
    padding: 10vw 5vw;
    gap: 3rem;
    flex: none;
  }

  .nav-links {
    display: none;
    /* Mobile menu needed in deep implementation, hiding for now for simplicity of mockup */
  }

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
}

/* Weight Controls */
.weight-controls {
  margin: 1.5rem 0;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.weight-pill {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.3s;
}

.weight-pill.active,
.weight-pill:hover {
  background: var(--text-primary);
  color: var(--bg-color);
  border-color: var(--text-primary);
}

.weight-slider-container {
  width: 100%;
  margin: 1.5rem 0;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.weight-slider-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  min-width: 60px;
}

.weight-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 2px;
  background: var(--border-subtle);
  outline: none;
  border-radius: 2px;
}

.weight-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text-primary);
  cursor: pointer;
}