/* ==========================================================================
   Again — Official Website Stylesheet (style.css)
   Clean, Apple-inspired Native Minimalism, Responsive & Accessible
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  --font-serif: "New York", "Charter", Georgia, "Times New Roman", serif;

  --bg-color: #ffffff;
  --bg-secondary: #f6f7f9;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-elevated: #ffffff;

  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;

  --border-color: rgba(0, 0, 0, 0.08);
  --border-subtle: rgba(0, 0, 0, 0.04);
  --glass-bg: rgba(255, 255, 255, 0.82);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.09);

  --btn-primary-bg: #111827;
  --btn-primary-text: #ffffff;
  --btn-primary-hover: #1f2937;
  --btn-secondary-bg: #f3f4f6;
  --btn-secondary-text: #111827;
  --btn-secondary-hover: #e5e7eb;

  --accent-dot: #111827;
  --accent-faint: rgba(17, 24, 39, 0.08);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;

  --container-max: 1080px;
}

[data-theme="dark"] {
  --bg-color: #0d0e11;
  --bg-secondary: #16181d;
  --bg-card: rgba(26, 29, 36, 0.75);
  --bg-elevated: #1e2129;

  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-tertiary: #6b7280;

  --border-color: rgba(255, 255, 255, 0.1);
  --border-subtle: rgba(255, 255, 255, 0.05);
  --glass-bg: rgba(13, 14, 17, 0.82);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.55);

  --btn-primary-bg: #ffffff;
  --btn-primary-text: #0d0e11;
  --btn-primary-hover: #e5e7eb;
  --btn-secondary-bg: #232731;
  --btn-secondary-text: #f3f4f6;
  --btn-secondary-hover: #2e3340;

  --accent-dot: #f3f4f6;
  --accent-faint: rgba(255, 255, 255, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-color: #0d0e11;
    --bg-secondary: #16181d;
    --bg-card: rgba(26, 29, 36, 0.75);
    --bg-elevated: #1e2129;

    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-tertiary: #6b7280;

    --border-color: rgba(255, 255, 255, 0.1);
    --border-subtle: rgba(255, 255, 255, 0.05);
    --glass-bg: rgba(13, 14, 17, 0.82);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.55);

    --btn-primary-bg: #ffffff;
    --btn-primary-text: #0d0e11;
    --btn-primary-hover: #e5e7eb;
    --btn-secondary-bg: #232731;
    --btn-secondary-text: #f3f4f6;
    --btn-secondary-hover: #2e3340;

    --accent-dot: #f3f4f6;
    --accent-faint: rgba(255, 255, 255, 0.12);
  }
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

/* Typography */
.serif {
  font-family: var(--font-serif);
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

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

/* Navigation Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: var(--glass-bg);
  border-bottom: 1px solid var(--border-subtle);
  transition: background 0.3s ease;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 500;
  color: var(--text-primary);
}

.brand-symbol {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-dasharray: 2.5 2.5;
  fill: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Language & Theme Controls */
.control-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 10px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.control-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-color);
}

.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.nav-cta-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.mobile-menu-btn {
  display: none;
  font-size: 20px;
  color: var(--text-primary);
}

/* Hero Section */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.hero-pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #10b981;
}

.hero-title {
  font-size: clamp(38px, 6vw, 64px);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: clamp(17px, 2.4vw, 21px);
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto 36px;
  font-weight: 400;
  line-height: 1.55;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  opacity: 0.94;
}

.btn-download svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  background: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  transition: all 0.2s ease;
}

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

.hero-meta {
  font-size: 13px;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

/* Responsive Styles for Header & Hero */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    box-shadow: var(--shadow-md);
  }

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

  .mobile-menu-btn {
    display: inline-flex;
  }

  .nav-cta-btn {
    display: none;
  }

  .hero-section {
    padding: 50px 0 40px;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .btn-download, .btn-secondary {
    width: 100%;
    justify-content: center;
  }
}