/* ============================================================
   Lucky Day Landing Page — style.css (Part 1/2)
   Theme: "Midnight Observatory"
   Core: Tokens, Reset, Typography, Layout, Nav, Hero, Buttons
   ============================================================ */

/* ── 1. Custom Properties (Design Tokens) ── */
:root {
  /* Backgrounds */
  --bg-primary: #0a0e27;
  --bg-secondary: #111638;
  --bg-tertiary: #161b45;
  --bg-elevated: rgba(255, 255, 255, 0.04);
  --bg-footer: #070b1e;
  /* Accent: Gold */
  --accent-gold: #d4a853;
  --accent-gold-light: #e8c97a;
  --accent-gold-dim: #a07d35;
  --accent-gold-glow: rgba(212, 168, 83, 0.15);
  /* Text */
  --text-primary: #f5f5f5;
  --text-secondary: #8b8fa3;
  --text-tertiary: #5a5e72;
  --text-on-gold: #0a0e27;
  /* Surfaces & Borders */
  --glass-surface: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.08);
  --border-subtle: rgba(212, 168, 83, 0.15);
  --border-focus: rgba(212, 168, 83, 0.5);
  /* Semantic */
  --color-success: #4ade80;
  --color-error: #f87171;
  /* Typography */
  --font-serif: 'Playfair Display', 'Noto Serif SC', Georgia, serif;
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont,
    'Segoe UI', system-ui, sans-serif;
  /* Spacing (4px base) */
  --space-xs: 4px;   --space-sm: 8px;    --space-md: 16px;
  --space-lg: 24px;  --space-xl: 40px;   --space-2xl: 64px;
  --space-3xl: 96px; --space-section: clamp(64px, 5vw, 96px);
  /* Motion */
  --duration-fast: 150ms;  --duration-normal: 300ms;  --duration-slow: 500ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  /* Layout */
  --container-max: 1440px;  --nav-height: 56px;
  --radius-sm: 8px;  --radius-md: 12px;  --radius-lg: 16px;
}

/* ── 2. Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: clamp(0.95rem, 0.88rem + 0.3vw, 1.0625rem);
  line-height: 1.65; letter-spacing: 0.01em;
  color: var(--text-secondary); background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }

/* ── 3. Skip Link ── */
.skip-link {
  position: absolute; top: -100%; left: var(--space-md); z-index: 1000;
  padding: var(--space-sm) var(--space-md);
  background: var(--accent-gold); color: var(--text-on-gold);
  font-weight: 600; font-size: 0.875rem; border-radius: var(--radius-sm);
  transition: top var(--duration-fast) var(--ease-out);
}
.skip-link:focus {
  top: var(--space-md);
  outline: 2px solid var(--border-focus); outline-offset: 2px;
}

/* ── 4. Typography Scale ── */
h1, h2, h3 { font-family: var(--font-serif); color: var(--text-primary); line-height: 1.2; }
h1 { font-size: clamp(2.75rem, 1rem+6vw, 5.5rem); font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.75rem, 1rem+2vw, 2.75rem); font-weight: 600; letter-spacing: -0.01em; }
h3 { font-size: clamp(1.125rem, 0.9rem+0.8vw, 1.5rem); font-weight: 600; line-height: 1.3; }
p { max-width: 65ch; }

.overline {
  display: inline-block; font-family: var(--font-sans);
  font-size: 0.6875rem; font-weight: 600; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--accent-gold);
}

/* ── 5. Layout Utilities ── */
.container {
  width: 100%; max-width: var(--container-max); margin-inline: auto;
  padding-inline: var(--space-lg);
}
@media (min-width: 768px) { .container { padding-inline: 40px; } }
@media (min-width: 1024px) { .container { padding-inline: var(--space-2xl); } }
.content-narrow { max-width: 720px; }
.content-text { max-width: 560px; }

/* ── 6. Navigation Bar (Glass-Morphism) ── */
.navbar {
  position: fixed; inset-inline: 0; top: 0; z-index: 100;
  height: var(--nav-height); display: flex; align-items: center;
  justify-content: space-between; padding-inline: var(--space-lg);
  transition: background-color var(--duration-normal) var(--ease-out),
              backdrop-filter var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
}
.navbar.nav-scrolled {
  background: rgba(10, 14, 39, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.nav-logo {
  font-family: var(--font-serif); font-size: 1.125rem; font-weight: 600;
  color: var(--text-primary); display: flex; align-items: center; gap: var(--space-xs);
}
.nav-logo-mark { color: var(--accent-gold); }
.nav-actions { display: flex; align-items: center; gap: var(--space-lg); }

.lang-toggle {
  font-family: var(--font-sans); font-size: 0.9375rem; font-weight: 500;
  letter-spacing: 0.04em; color: var(--text-tertiary);
  transition: color var(--duration-fast) ease; padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
}
.lang-toggle:hover { color: var(--text-primary); }
.lang-toggle:focus-visible { outline: 2px solid var(--border-focus); outline-offset: 2px; }
.lang-active { color: var(--text-primary); font-weight: 600; }
.lang-sep { color: var(--text-tertiary); opacity: 0.4; }

.hamburger {
  display: flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 24px; height: 24px; padding: var(--space-xs);
}
.hamburger span {
  display: block; width: 100%; height: 1.5px;
  background: var(--text-primary); border-radius: 1px;
  transition: transform var(--duration-normal) var(--ease-out), opacity var(--duration-fast) ease;
}

/* Mobile nav menu overlay */
.nav-menu {
  position: fixed; inset: 0; top: var(--nav-height); z-index: 99;
  background: rgba(10, 14, 39, 0.96);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: var(--space-xl);
  opacity: 0; visibility: hidden;
  transition: opacity var(--duration-normal) var(--ease-out), visibility var(--duration-normal);
}
.nav-menu.nav-open { opacity: 1; visibility: visible; }
.nav-menu a {
  font-family: var(--font-serif); font-size: 1.5rem; font-weight: 600;
  color: var(--text-primary); transition: color var(--duration-fast) ease;
}
.nav-menu a:hover { color: var(--accent-gold); }

@media (min-width: 768px) {
  :root { --nav-height: 64px; }
  .hamburger { display: none; }
}

/* ── 7. Hero Section ── */
.hero {
  position: relative; min-height: 80vh; display: flex; flex-direction: column;
  justify-content: center; padding-top: calc(var(--nav-height) + var(--space-3xl));
  padding-bottom: var(--space-3xl); overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(
    ellipse 80% 60% at 50% 40%,
    rgba(212, 168, 83, 0.07) 0%, rgba(212, 168, 83, 0.03) 40%, transparent 70%
  );
  pointer-events: none; z-index: 0;
}
.hero::after {
  content: ''; position: absolute; inset: 0; opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 0L60 30L30 60L0 30Z' fill='none' stroke='%23d4a853' stroke-width='0.5'/%3E%3Ccircle cx='30' cy='30' r='15' fill='none' stroke='%23d4a853' stroke-width='0.3'/%3E%3C/svg%3E");
  background-size: 60px 60px; pointer-events: none; z-index: 1;
}
.hero-content { position: relative; z-index: 2; max-width: 720px; }
.hero-title { margin-bottom: var(--space-lg); }
.hero-title .line2 { display: block; }
.hero-subtitle {
  font-size: clamp(1.05rem, 0.9rem+0.5vw, 1.25rem); color: var(--text-secondary);
  max-width: 54ch; margin-bottom: var(--space-xl); line-height: 1.6;
}
.hero-ctas { display: flex; flex-wrap: wrap; gap: var(--space-md); }

@media (min-width: 1024px) {
  .hero { min-height: 100vh; align-items: center; text-align: center; padding-top: 0; }
  .hero-content { margin-inline: auto; }
  .hero-subtitle { margin-inline: auto; }
  .hero-ctas { justify-content: center; }
}

/* ── 8. Buttons ── */

/* Primary CTA (Gold Solid) */
.btn-primary {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  padding: 14px 24px;
  font-size: clamp(0.9rem, 0.85rem+0.25vw, 1.0625rem); font-weight: 600;
  letter-spacing: 0.03em; color: var(--text-on-gold);
  background: var(--accent-gold); border-radius: var(--radius-sm);
  box-shadow: 0 4px 24px rgba(212, 168, 83, 0.25);
  transition: background-color var(--duration-fast) ease, transform var(--duration-fast) ease,
              box-shadow var(--duration-fast) ease;
}
.btn-primary:hover {
  background: var(--accent-gold-light); transform: translateY(-1px);
  box-shadow: 0 6px 28px rgba(212, 168, 83, 0.35);
}
.btn-primary:focus-visible { outline: 2px solid var(--border-focus); outline-offset: 2px; }
.btn-primary:active { transform: translateY(0); box-shadow: 0 2px 12px rgba(212, 168, 83, 0.2); }

/* Ghost Button */
.btn-ghost {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  padding: 14px 24px;
  font-size: clamp(0.9rem, 0.85rem+0.25vw, 1.0625rem); font-weight: 600;
  letter-spacing: 0.03em; color: var(--accent-gold);
  background: transparent; border: 1px solid var(--accent-gold); border-radius: var(--radius-sm);
  transition: background-color var(--duration-fast) ease, border-color var(--duration-fast) ease,
              transform var(--duration-fast) ease;
}
.btn-ghost:hover {
  background: rgba(212, 168, 83, 0.08); border-color: var(--accent-gold-light);
  transform: translateY(-1px);
}
.btn-ghost:focus-visible { outline: 2px solid var(--border-focus); outline-offset: 2px; }
.btn-ghost:active { background: rgba(212, 168, 83, 0.12); transform: translateY(0); }

/* Download Badge */
.btn-download {
  display: inline-flex; align-items: center; gap: var(--space-md);
  padding: 12px 20px; background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border); border-radius: 10px;
  transition: background-color var(--duration-fast) ease, transform var(--duration-fast) ease,
              border-color var(--duration-fast) ease;
}
.btn-download:hover {
  background: rgba(255, 255, 255, 0.10); border-color: var(--border-subtle);
  transform: translateY(-2px);
}
.btn-download-icon { width: 24px; height: 24px; flex-shrink: 0; color: var(--text-secondary); }
.btn-download-text { text-align: left; }
.btn-download-label {
  display: block; font-size: 0.75rem; font-weight: 500;
  color: var(--text-tertiary); line-height: 1.4;
}
.btn-download-store {
  display: block; font-size: 0.9375rem; font-weight: 500;
  color: var(--text-primary); line-height: 1.3;
}
@media (max-width: 479px) { .btn-download { width: 100%; justify-content: center; } }

/* ── 9. Focus Styles & Reduced Motion ── */
:focus-visible { outline: 2px solid var(--border-focus); outline-offset: 2px; }
:focus:not(:focus-visible) { outline: none; }

[data-i18n] { transition: opacity 150ms ease; }

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