/**
 * Multi Tube Views (MTV) — Clean Minimalism Design System
 * Apple-inspired clean minimalism, high contrast, refined neutrals, and precision spacing.
 */

:root {
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, monospace;

  /* Clean Minimalism Light Theme Tokens */
  --bg-primary: #FDFDFD;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #FFFFFF;
  --bg-subtle: #F5F5F7;
  --bg-hover: #F9FAFB;
  
  --text-primary: #1D1D1F;
  --text-secondary: #86868B;
  --text-muted: #86868B;
  --text-inverse: #FFFFFF;

  --border-subtle: #F2F2F2;
  --border-strong: #E5E5E7;
  --border-focus: #0066CC;

  --accent-primary: #1D1D1F;
  --accent-primary-hover: #000000;
  --accent-blue: #0066CC;
  --accent-subtle: #F5F5F7;
  --accent-border: #E5E5E7;

  --success-bg: #F2FBF4;
  --success-text: #34C759;
  --success-border: #D1F2D9;

  --warning-bg: #FFF9F0;
  --warning-text: #FF9500;
  --warning-border: #FFE5B4;

  --danger-bg: #FFF2F2;
  --danger-text: #FF3B30;
  --danger-border: #FFD1D1;

  /* Shadows */
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.03);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.06), 0 4px 6px -4px rgba(0, 0, 0, 0.02);
  --shadow-xl: 0 20px 30px -6px rgba(0, 0, 0, 0.08);

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Layout */
  --header-height: 64px;
  --max-width: 1200px;
  --transition-speed: 0.18s;
}

[data-theme="dark"] {
  --bg-primary: #0A0A0C;
  --bg-surface: #161618;
  --bg-surface-elevated: #1D1D20;
  --bg-subtle: #242428;
  --bg-hover: #2C2C30;

  --text-primary: #F5F5F7;
  --text-secondary: #A1A1A6;
  --text-muted: #86868B;
  --text-inverse: #1D1D1F;

  --border-subtle: #242428;
  --border-strong: #38383E;
  --border-focus: #2997FF;

  --accent-primary: #F5F5F7;
  --accent-primary-hover: #FFFFFF;
  --accent-blue: #2997FF;
  --accent-subtle: #1C2733;
  --accent-border: #2B4058;

  --success-bg: #0A2412;
  --success-text: #30D158;
  --success-border: #144422;

  --warning-bg: #2B1800;
  --warning-text: #FF9F0A;
  --warning-border: #523100;

  --danger-bg: #2C0B0E;
  --danger-text: #FF453A;
  --danger-border: #5C151B;

  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 20px 30px -6px rgba(0, 0, 0, 0.7);
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
  overflow-x: hidden;
  width: 100%;
}

body.drawer-open {
  overflow: hidden;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

h1 { font-size: clamp(1.5rem, 4vw, 2.75rem); font-weight: 700; }
h2 { font-size: clamp(1.25rem, 3vw, 2rem); }
h3 { font-size: clamp(1.05rem, 2.2vw, 1.4rem); font-weight: 600; }
h4 { font-size: clamp(0.95rem, 1.8vw, 1.05rem); font-weight: 600; }

p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color var(--transition-speed) ease, opacity var(--transition-speed) ease;
  touch-action: manipulation;
}

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

a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* Form Inputs Mobile Best Practice (16px base font prevents iOS auto-zoom) */
input, select, textarea, button {
  font-size: 16px;
  touch-action: manipulation;
}

/* Global Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(0.75rem, 3.5vw, 1.5rem);
  padding-right: clamp(0.75rem, 3.5vw, 1.5rem);
}

.site-main {
  flex: 1 0 auto;
  padding-bottom: 4rem;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background-color: rgba(253, 253, 253, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

[data-theme="dark"] .site-header {
  background-color: rgba(10, 10, 12, 0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand:hover {
  color: var(--text-primary);
  opacity: 0.9;
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--text-primary);
  color: var(--bg-surface);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

[data-theme="dark"] .brand-icon {
  background: #FFFFFF;
  color: #1D1D1F;
}

.brand-text {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.brand-badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-full);
  background-color: var(--bg-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-strong);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.4rem 0.2rem;
  position: relative;
  transition: color var(--transition-speed) ease;
}

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

.nav-link.active {
  color: var(--text-primary);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Button System — Clean Minimalism */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.65rem 1.35rem;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-speed) ease;
  user-select: none;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: var(--text-inverse);
  border-color: var(--accent-primary);
}

.btn-primary:hover {
  background-color: var(--accent-primary-hover);
  border-color: var(--accent-primary-hover);
  color: var(--text-inverse);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-secondary:hover {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
  border-color: var(--text-primary);
}

.btn-subtle {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
  border-color: transparent;
}

.btn-subtle:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.btn-danger {
  background-color: var(--danger-bg);
  color: var(--danger-text);
  border-color: var(--danger-border);
}

.btn-danger:hover {
  background-color: #fee2e2;
}

.btn-icon-only {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-full);
  color: var(--text-primary);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-strong);
}

.btn-icon-only:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--text-primary);
}

.btn-sm {
  font-size: 0.8rem;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
}

.btn-lg {
  font-size: 0.95rem;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-full);
}

/* Card System */
.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.card-hoverable:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

/* Footer — Minimalist Elegance */
.site-footer {
  margin-top: auto;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 3.5rem 0 2rem 0;
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2.5rem;
}

.footer-brand h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.footer-brand p {
  font-size: 0.88rem;
  color: var(--text-muted);
  max-width: 360px;
  line-height: 1.55;
}

.footer-col h4 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-bottom-info {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.creator-credit {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.creator-name {
  font-weight: 600;
  color: var(--text-secondary);
}

.creator-sep {
  opacity: 0.45;
}

.creator-link {
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-speed) ease;
}

.creator-link:hover {
  color: var(--accent-primary);
}

/* Creator Profile Card (Credits & About pages) */
.creator-profile-card {
  margin-top: 3rem;
  padding: 1.5rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-speed) ease;
}

.creator-profile-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.creator-profile-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background-color: var(--accent-subtle);
  color: var(--accent-primary);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.8rem;
}

.creator-profile-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.creator-profile-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

.footer-bottom-links {
  display: flex;
  gap: 1.5rem;
}

.footer-bottom-links a {
  color: var(--text-muted);
}

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