/* ============================================
   《币圈人生》手游落地页 - Mobile-First CSS
   ============================================ */

/* === CSS Variables (Design Tokens) === */
:root {
  --color-primary: #0a1628;
  --color-primary-light: #1a2a4a;
  --color-gold: #d4a853;
  --color-gold-dark: #b8923e;
  --color-gold-light: #e8c97a;
  --color-text: #f0f0f0;
  --color-text-secondary: #a0a8b8;
  --color-card-bg: rgba(255, 255, 255, 0.05);
  --color-card-border: rgba(255, 255, 255, 0.08);
  --color-success: #4ade80;
  --color-error: #ef4444;
  --color-overlay: rgba(10, 22, 40, 0.85);

  --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 15px;
  --font-size-md: 17px;
  --font-size-lg: 20px;
  --font-size-xl: 24px;
  --font-size-2xl: 28px;
  --font-size-3xl: 36px;
  --font-size-4xl: 48px;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-gold: 0 4px 20px rgba(212, 168, 83, 0.3);

  --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);

  --nav-height: 56px;
  --container-max: 1200px;
  --container-padding: 16px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

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

input {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

/* === Utility === */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-sm);
  line-height: 1.3;
}

.section-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

/* === Scroll Animation === */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--ease-default), transform 0.6s var(--ease-default);
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* === Navigation === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: background-color 0.3s var(--ease-default), box-shadow 0.3s var(--ease-default);
}

.nav.is-scrolled {
  background-color: rgba(10, 22, 40, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-gold);
  z-index: 1001;
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-dark));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--color-primary);
  font-weight: 700;
}

.nav-links {
  display: none;
  gap: var(--spacing-lg);
}

.nav-link {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color 0.2s var(--ease-default);
  white-space: nowrap;
}

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

.nav-cta {
  display: none;
  padding: 8px 20px;
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-dark));
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: transform 0.2s var(--ease-default), box-shadow 0.2s var(--ease-default);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}

/* Language Switcher */
.lang-switcher {
  position: relative;
  display: flex;
  align-items: center;
}

.lang-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  transition: color 0.2s var(--ease-default), background 0.2s var(--ease-default);
  min-height: 44px;
  min-width: 44px;
}

.lang-btn:hover {
  color: var(--color-text);
  background: var(--color-card-bg);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--color-primary-light);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-xs);
  min-width: 160px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.2s var(--ease-default), transform 0.2s var(--ease-default), visibility 0.2s var(--ease-default);
  z-index: 1002;
}

.lang-dropdown.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-option {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  width: 100%;
  padding: 10px 12px;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: background 0.15s var(--ease-default), color 0.15s var(--ease-default);
  min-height: 44px;
  text-align: left;
}

.lang-option:hover {
  background: var(--color-card-bg);
  color: var(--color-text);
}

.lang-option.is-active {
  color: var(--color-gold);
  background: rgba(212, 168, 83, 0.1);
}

/* Hamburger */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  z-index: 1001;
}

.hamburger-line {
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s var(--ease-default), opacity 0.3s var(--ease-default);
}

.hamburger-line + .hamburger-line {
  margin-top: 5px;
}

.hamburger.is-active .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.is-active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.hamburger.is-active .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(10, 22, 40, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-lg);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s var(--ease-default), visibility 0.3s var(--ease-default);
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu-link {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  padding: var(--spacing-sm) var(--spacing-md);
  transition: color 0.2s var(--ease-default);
  min-height: 44px;
  display: flex;
  align-items: center;
}

.mobile-menu-link:hover {
  color: var(--color-text);
}

.mobile-menu-cta {
  margin-top: var(--spacing-md);
  padding: 12px 32px;
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-dark));
  color: var(--color-primary);
  font-size: var(--font-size-md);
  font-weight: 600;
  border-radius: var(--radius-full);
  min-height: 44px;
}

/* === Hero === */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-height) + var(--spacing-xl)) var(--container-padding) var(--spacing-2xl);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-bg::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    180deg,
    rgba(10, 22, 40, 0.7) 0%,
    rgba(10, 22, 40, 0.5) 40%,
    rgba(10, 22, 40, 0.8) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 680px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  color: var(--color-gold);
  margin-bottom: var(--spacing-lg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.hero-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-gold-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-xl);
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 40px;
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-dark));
  color: var(--color-primary);
  font-size: var(--font-size-md);
  font-weight: 600;
  border-radius: var(--radius-full);
  min-height: 48px;
  transition: transform 0.2s var(--ease-default), box-shadow 0.2s var(--ease-default);
  box-shadow: var(--shadow-gold);
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(212, 168, 83, 0.4);
}

.hero-cta:active {
  transform: translateY(0);
}

.hero-age-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--spacing-lg);
  padding: 6px 14px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

/* === Features === */
.features {
  padding: var(--spacing-3xl) var(--container-padding);
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  max-width: var(--container-max);
  margin: 0 auto;
}

.feature-card {
  padding: var(--spacing-lg);
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: transform 0.3s var(--ease-default), border-color 0.3s var(--ease-default);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(212, 168, 83, 0.2);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(212, 168, 83, 0.15), rgba(212, 168, 83, 0.05));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-gold);
}

.feature-title {
  font-size: var(--font-size-md);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.feature-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* === Screenshots === */
.screenshots {
  padding: var(--spacing-3xl) 0;
  background: var(--color-primary-light);
  overflow: hidden;
}

.screenshots .section-title,
.screenshots .section-subtitle {
  padding: 0 var(--container-padding);
}

.screenshots-carousel {
  position: relative;
  width: 100%;
  overflow: hidden;
}

.screenshots-track {
  display: flex;
  gap: var(--spacing-md);
  padding: 0 var(--container-padding);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.screenshots-track::-webkit-scrollbar {
  display: none;
}

.screenshot-item {
  flex: 0 0 75%;
  max-width: 280px;
  scroll-snap-align: center;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform 0.3s var(--ease-default);
}

.screenshot-item img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
}

.screenshots-dots {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

.screenshots-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transition: background 0.3s var(--ease-default), transform 0.3s var(--ease-default);
  cursor: pointer;
  padding: 0;
}

.screenshots-dot.is-active {
  background: var(--color-gold);
  transform: scale(1.3);
}

/* === Reviews === */
.reviews {
  padding: var(--spacing-3xl) var(--container-padding);
  background: linear-gradient(180deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
}

.reviews-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  max-width: var(--container-max);
  margin: 0 auto;
}

.review-card {
  padding: var(--spacing-lg);
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.review-stars {
  display: flex;
  gap: 2px;
  margin-bottom: var(--spacing-md);
}

.review-star {
  width: 16px;
  height: 16px;
  color: var(--color-gold);
}

.review-text {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

.review-author {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.review-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
}

.review-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.review-tag {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

/* === Reservation === */
.reservation {
  padding: var(--spacing-3xl) var(--container-padding);
  background: var(--color-primary);
  position: relative;
}

.reservation::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(212, 168, 83, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.reservation-form {
  max-width: 420px;
  margin: 0 auto;
  position: relative;
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.form-input-wrapper {
  display: flex;
  align-items: center;
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s var(--ease-default);
}

.form-input-wrapper:focus-within {
  border-color: var(--color-gold);
}

.form-input-wrapper.has-error {
  border-color: var(--color-error);
}

.form-prefix {
  padding: 0 var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border-right: 1px solid var(--color-card-border);
  white-space: nowrap;
}

.form-input {
  flex: 1;
  padding: 14px var(--spacing-md);
  font-size: var(--font-size-base);
  color: var(--color-text);
  min-height: 48px;
}

.form-input::placeholder {
  color: rgba(160, 168, 184, 0.5);
}

.form-code-btn {
  flex-shrink: 0;
  padding: 0 var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-gold);
  min-height: 48px;
  min-width: 100px;
  white-space: nowrap;
  transition: opacity 0.2s var(--ease-default);
}

.form-code-btn:disabled {
  color: var(--color-text-secondary);
  opacity: 0.5;
  cursor: not-allowed;
}

.form-error {
  font-size: var(--font-size-xs);
  color: var(--color-error);
  margin-top: var(--spacing-xs);
  display: none;
}

.form-error.is-visible {
  display: block;
}

.form-submit {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-dark));
  color: var(--color-primary);
  font-size: var(--font-size-md);
  font-weight: 600;
  border-radius: var(--radius-md);
  min-height: 48px;
  margin-top: var(--spacing-md);
  transition: transform 0.2s var(--ease-default), box-shadow 0.2s var(--ease-default);
  box-shadow: var(--shadow-gold);
}

.form-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(212, 168, 83, 0.4);
}

.form-submit:active {
  transform: translateY(0);
}

.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.form-benefits {
  margin-top: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.form-benefit {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.form-benefit-icon {
  width: 16px;
  height: 16px;
  color: var(--color-success);
  flex-shrink: 0;
}

.form-trust {
  margin-top: var(--spacing-md);
  font-size: var(--font-size-xs);
  color: rgba(160, 168, 184, 0.6);
  text-align: center;
}

/* === FAQ === */
.faq {
  padding: var(--spacing-3xl) var(--container-padding);
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
}

.faq-list {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.faq-item {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.3s var(--ease-default);
}

.faq-item.is-open {
  border-color: rgba(212, 168, 83, 0.2);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-align: left;
  min-height: 52px;
  gap: var(--spacing-md);
  transition: color 0.2s var(--ease-default);
}

.faq-question:hover {
  color: var(--color-gold);
}

.faq-arrow {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-text-secondary);
  transition: transform 0.3s var(--ease-default), color 0.3s var(--ease-default);
}

.faq-item.is-open .faq-arrow {
  transform: rotate(180deg);
  color: var(--color-gold);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s var(--ease-default);
}

.faq-answer-inner {
  padding: 0 var(--spacing-md) var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* === Footer === */
.footer {
  padding: var(--spacing-2xl) var(--container-padding) var(--spacing-lg);
  background: var(--color-primary-light);
  border-top: 1px solid var(--color-card-border);
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.footer-link {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color 0.2s var(--ease-default);
  min-height: 44px;
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-xs);
}

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

.footer-info {
  font-size: var(--font-size-xs);
  color: rgba(160, 168, 184, 0.6);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

.footer-age {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: #fca5a5;
  margin-bottom: var(--spacing-md);
}

.footer-copyright {
  font-size: var(--font-size-xs);
  color: rgba(160, 168, 184, 0.4);
}

/* === Modal === */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--container-padding);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s var(--ease-default), visibility 0.3s var(--ease-default);
}

.modal-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.modal {
  width: 100%;
  max-width: 560px;
  max-height: 80vh;
  background: var(--color-primary-light);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: scale(0.9);
  transition: transform 0.3s var(--ease-default);
}

.modal-overlay.is-open .modal {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-card-border);
  flex-shrink: 0;
}

.modal-title {
  font-size: var(--font-size-md);
  font-weight: 600;
}

.modal-close {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  transition: color 0.2s var(--ease-default);
}

.modal-close:hover {
  color: var(--color-text);
}

.modal-body {
  padding: var(--spacing-lg);
  overflow-y: auto;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.modal-body h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin: var(--spacing-md) 0 var(--spacing-sm);
}

.modal-body p {
  margin-bottom: var(--spacing-sm);
}

/* === Toast === */
.toast {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  padding: var(--spacing-lg) var(--spacing-xl);
  background: rgba(26, 42, 74, 0.95);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 3000;
  text-align: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s var(--ease-default), transform 0.3s var(--ease-default), visibility 0.3s var(--ease-default);
  box-shadow: var(--shadow-lg);
  max-width: 300px;
}

.toast.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -50%) scale(1);
}

.toast-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--spacing-md);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.toast-icon.success {
  background: rgba(74, 222, 128, 0.15);
  color: var(--color-success);
}

.toast-icon.error {
  background: rgba(239, 68, 68, 0.15);
  color: var(--color-error);
}

.toast-message {
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.toast-sub {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
}

/* === Responsive: Tablet (768px+) === */
@media (min-width: 768px) {
  :root {
    --container-padding: 24px;
  }

  .section-title {
    font-size: var(--font-size-2xl);
  }

  .section-subtitle {
    font-size: var(--font-size-base);
  }

  .hero-title {
    font-size: var(--font-size-4xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-lg);
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }

  .screenshot-item {
    flex: 0 0 40%;
    max-width: 320px;
  }

  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }

  .faq-question {
    font-size: var(--font-size-base);
    padding: var(--spacing-lg);
  }

  .faq-answer-inner {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
  }
}

/* === Responsive: Desktop (1024px+) === */
@media (min-width: 1024px) {
  :root {
    --container-padding: 32px;
    --nav-height: 64px;
  }

  .hamburger {
    display: none;
  }

  .nav-links {
    display: flex;
  }

  .nav-cta {
    display: inline-flex;
  }

  .section-title {
    font-size: var(--font-size-3xl);
  }

  .hero-title {
    font-size: 56px;
  }

  .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .screenshot-item {
    flex: 0 0 22%;
    max-width: 300px;
  }

  .reviews-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-links {
    gap: var(--spacing-xl);
  }
}

/* === Large Desktop (1280px+) === */
@media (min-width: 1280px) {
  .reviews-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* === Accessibility === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* === Print === */
@media print {
  .nav, .hamburger, .mobile-menu, .modal-overlay, .toast {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }
}