/* ========================================
   简灵AI官网 - 全局样式 v3
   设计理念：温暖、亲和、圆润，匹配品牌logo
   主色：蓝青 #38B2C4 | 辅色：薄荷绿 #7BD3C2
   ======================================== */

/* ===== CSS Variables ===== */
:root {
  /* Colors - 从logo提取的蓝青绿色系 */
  --color-primary: #38B2C4;
  --color-primary-dark: #2E9AA8;
  --color-primary-light: #E6F7F9;
  --color-secondary: #7BD3C2;
  --color-secondary-light: #E8F8F4;
  --color-bg: #F5FBFC;
  --color-card: #FFFFFF;
  --color-text: #1E4D5C;
  --color-text-secondary: #4A6B75;
  --color-text-light: #8BA4AD;
  --color-border: #D5ECF1;
  --color-border-dark: #B8DFE6;
  --color-dark: #1E4D5C;
  --color-dark-light: #2A6575;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 5rem;

  /* Radius - 圆润但不幼稚 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Shadows - 柔和清透 */
  --shadow-sm: 0 2px 4px rgba(30, 77, 92, 0.04);
  --shadow-md: 0 4px 12px rgba(30, 77, 92, 0.06);
  --shadow-lg: 0 8px 24px rgba(30, 77, 92, 0.1);

  /* Layout */
  --container-max: 1120px;
  --navbar-height: 72px;

  /* Transitions */
  --transition: 0.2s ease;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition);
}

ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ===== Utilities ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section { padding: var(--space-4xl) 0; }
.section--tight { padding: var(--space-3xl) 0; }
.text-center { text-align: center; }

/* ===== Section Title ===== */
.section-title {
  margin-bottom: var(--space-2xl);
}

.section-title h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.section-title p {
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 560px;
}

.section-title--center {
  text-align: center;
}

.section-title--center p {
  margin: 0 auto;
}

.section-title .tag-line {
  display: none;
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  z-index: 1000;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

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

.navbar__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.navbar__logo img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  object-fit: cover;
}

.navbar__logo span {
  color: var(--color-primary);
}

.navbar__menu {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.navbar__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

.navbar__link:hover,
.navbar__link.active {
  color: var(--color-primary);
}

.navbar__toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  border-radius: var(--radius-md);
}

.navbar__toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

.navbar__toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.navbar__toggle.active span:nth-child(2) { opacity: 0; }
.navbar__toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 11px 24px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  white-space: nowrap;
  cursor: pointer;
}

.btn--primary {
  background: var(--color-primary);
  color: white;
  box-shadow: 0 4px 12px rgba(56, 178, 196, 0.25);
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(56, 178, 196, 0.35);
}

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

.btn--secondary:hover {
  background: #64C4B2;
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border-dark);
}

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

.btn--white {
  background: white;
  color: var(--color-primary);
}

.btn--white:hover {
  background: var(--color-primary-light);
}

.btn--lg {
  padding: 13px 30px;
  font-size: 0.95rem;
}

.btn--block { width: 100%; }

/* ===== Cards ===== */
.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  overflow: hidden;
}

.card:hover {
  border-color: var(--color-border-dark);
  box-shadow: var(--shadow-md);
}

/* ===== Feature Card ===== */
.feature-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition);
}

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

.feature-card__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===== Course Card ===== */
.course-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.course-card:hover {
  border-color: var(--color-border-dark);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.course-card__cover {
  height: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  position: relative;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
}

.course-card__cover::after { display: none; }

.course-card__body {
  padding: var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.course-card__tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-sm);
  align-self: flex-start;
  letter-spacing: 0.02em;
}

.course-card__tag--beginner { background: var(--color-secondary-light); color: #1B7A6B; }
.course-card__tag--intermediate { background: #FFF8E7; color: #B47A00; }
.course-card__tag--advanced { background: #FFF0F3; color: #B33A4E; }

.course-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
  line-height: 1.4;
}

.course-card p {
  font-size: 0.825rem;
  color: var(--color-text-secondary);
  flex: 1;
  margin-bottom: var(--space-md);
  line-height: 1.5;
}

.course-card__link {
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition);
}

.course-card__link:hover { gap: 6px; }

/* ===== Grid ===== */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: calc(var(--navbar-height) + var(--space-4xl)) 0 var(--space-4xl);
  background: linear-gradient(180deg, #E8F8FA 0%, var(--color-bg) 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(123, 211, 194, 0.25) 0%, transparent 70%);
  border-radius: 50%;
  z-index: 0;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -10%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(56, 178, 196, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  z-index: 0;
}

.hero .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 0.85fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero__inner {
  max-width: 600px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: white;
  border: 1px solid var(--color-border);
  color: var(--color-primary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--color-text);
  line-height: 1.25;
  margin-bottom: var(--space-md);
  letter-spacing: -0.03em;
}

.hero p {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  line-height: 1.6;
  max-width: 520px;
}

.hero__actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.hero__visual::before {
  content: '';
  position: absolute;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.8) 0%, transparent 70%);
  border-radius: 50%;
  z-index: 0;
}

.hero__visual img {
  width: 240px;
  height: 240px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  position: relative;
  z-index: 1;
}

.hero__image {
  margin-top: var(--space-2xl);
  max-width: 900px;
}

.hero__image img {
  width: 100%;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

/* ===== Filter Tags ===== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-2xl);
}

.filter-tag {
  padding: 7px 16px;
  font-size: 0.825rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  background: var(--color-card);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-tag.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* ===== Download Section ===== */
.download-platforms {
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.download-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  text-align: center;
  transition: all var(--transition);
  width: 300px;
  max-width: 100%;
}

.download-card:hover {
  border-color: var(--color-border-dark);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.download-card__icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-md);
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.download-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.download-card__version {
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-lg);
}

/* ===== Steps ===== */
.steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  max-width: 640px;
  margin: 0 auto;
}

.step {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-card);
}

.step__number {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: white;
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.step__content h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.step__content p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ===== Accordion / FAQ ===== */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

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

.faq-item.active {
  border-color: var(--color-border-dark);
}

.faq-item__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  user-select: none;
}

.faq-item__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition);
  color: var(--color-primary);
}

.faq-item.active .faq-item__icon {
  transform: rotate(180deg);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 var(--space-lg);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.faq-item.active .faq-item__answer {
  max-height: 200px;
  padding-bottom: var(--space-md);
}

/* ===== System Requirements Table ===== */
.sys-req {
  max-width: 680px;
  margin: 0 auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.sys-req table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-card);
}

.sys-req th,
.sys-req td {
  padding: var(--space-md) var(--space-lg);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.sys-req th {
  background: var(--color-bg);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text);
}

.sys-req td {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.sys-req tr:last-child th,
.sys-req tr:last-child td {
  border-bottom: none;
}

/* ===== Value Card (About page) ===== */
.value-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition);
}

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

.value-card__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.value-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.value-card p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===== Story Block (About page) ===== */
.story-block {
  max-width: 680px;
  margin: 0 auto;
}

.story-block p {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.story-block p strong {
  color: var(--color-text);
  font-weight: 700;
}

/* ===== Contact Section ===== */
.contact-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  text-align: center;
  max-width: 420px;
  margin: 0 auto;
}

.contact-card__qr {
  width: 160px;
  height: 160px;
  border-radius: var(--radius-md);
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-md);
  color: var(--color-text-light);
  font-size: 0.8rem;
  border: 1px solid var(--color-border);
}

.contact-card__qr img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.contact-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.contact-card p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.contact-card__email {
  margin-top: var(--space-md);
  font-size: 0.9rem;
  color: var(--color-primary);
  font-weight: 600;
}

/* ===== CTA Section ===== */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
}

.cta-section::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 300px;
  height: 300px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 50%;
}

.cta-section h2 {
  font-size: 1.7rem;
  font-weight: 800;
  color: white;
  margin-bottom: var(--space-sm);
  position: relative;
  z-index: 1;
  letter-spacing: -0.02em;
}

.cta-section p {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--space-lg);
  position: relative;
  z-index: 1;
}

.cta-section .btn {
  position: relative;
  z-index: 1;
}

/* ===== Footer ===== */
.footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.65);
  padding: var(--space-3xl) 0 var(--space-lg);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer__brand .navbar__logo {
  color: white;
  margin-bottom: var(--space-sm);
}

.footer__brand p {
  font-size: 0.825rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.45);
  max-width: 280px;
}

.footer__col h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: white;
  margin-bottom: var(--space-sm);
}

.footer__col ul li {
  margin-bottom: var(--space-xs);
}

.footer__col a {
  font-size: 0.825rem;
  color: rgba(255, 255, 255, 0.45);
  transition: color var(--transition);
}

.footer__col a:hover {
  color: white;
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: var(--space-lg);
  text-align: center;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.35);
}

/* ===== Scroll Animation ===== */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Page Hero (inner pages) ===== */
.page-hero {
  background: linear-gradient(180deg, #E8F8FA 0%, var(--color-bg) 100%);
  padding: calc(var(--navbar-height) + var(--space-3xl)) 0 var(--space-2xl);
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

.page-hero::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(123, 211, 194, 0.2) 0%, transparent 70%);
  border-radius: 50%;
}

.page-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 640px;
}

.page-hero h1 {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.03em;
}

.page-hero p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root {
    --space-4xl: 3rem;
    --space-3xl: 2.5rem;
    --navbar-height: 64px;
  }

  .navbar__menu {
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: white;
    padding: var(--space-lg);
    gap: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-200%);
    transition: transform var(--transition);
    align-items: flex-start;
  }

  .navbar__menu.active { transform: translateY(0); }
  .navbar__toggle { display: flex; }

  .hero .container { grid-template-columns: 1fr; gap: var(--space-2xl); text-align: center; }
  .hero__inner { max-width: 100%; }
  .hero p { margin-left: auto; margin-right: auto; }
  .hero__actions { justify-content: center; }
  .hero__visual img { width: 180px; height: 180px; }
  .hero__visual::before { width: 220px; height: 220px; }
  .hero h1 { font-size: 1.875rem; }
  .hero p { font-size: 0.95rem; }
  .page-hero h1 { font-size: 1.625rem; }
  .page-hero p { font-size: 0.9rem; }

  .section-title h2 { font-size: 1.375rem; }
  .section-title p { font-size: 0.875rem; }

  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }

  .footer__grid { grid-template-columns: 1fr; gap: var(--space-lg); }

  .hero__actions { flex-direction: column; align-items: stretch; }
  .hero__actions .btn { width: 100%; max-width: 280px; }

  .download-platforms { flex-direction: column; align-items: stretch; }
  .download-card { width: 100%; max-width: 340px; margin: 0 auto; }

  .step { gap: var(--space-sm); padding: var(--space-sm); }
  .step__number { width: 26px; height: 26px; font-size: 0.75rem; }

  .container { padding: 0 var(--space-md); }

  .cta-section { padding: var(--space-xl) var(--space-md); }
  .cta-section h2 { font-size: 1.25rem; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.625rem; }
  .filter-tag { padding: 6px 14px; font-size: 0.775rem; }
  .feature-card { padding: var(--space-md); }
  .navbar__logo img { width: 36px; height: 36px; }
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--color-dark);
  color: white;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 8px 24px rgba(30, 77, 92, 0.2);
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
  pointer-events: none;
  white-space: nowrap;
}

.toast svg {
  color: var(--color-secondary);
  flex-shrink: 0;
}

.toast--show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}