/* ==========================================================================
   简约汇率 (Currency Converter) Official Landing Page Styles
   Designed with Modern Glassmorphism, Micro-interactions & Fluid Responsive Design
   ========================================================================== */

:root {
  /* Color Tokens - Dark Mode (Default) */
  --bg-body: #0a0d14;
  --bg-body-gradient: radial-gradient(circle at 50% 0%, #172033 0%, #0a0d14 70%);
  --bg-card: rgba(18, 24, 38, 0.65);
  --bg-card-hover: rgba(26, 35, 54, 0.8);
  --bg-card-border: rgba(255, 255, 255, 0.08);
  --bg-card-border-hover: rgba(99, 102, 241, 0.35);
  --bg-glass: rgba(15, 21, 34, 0.75);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --primary: #38bdf8;
  --primary-glow: rgba(56, 189, 248, 0.25);
  --accent-emerald: #10b981;
  --accent-indigo: #6366f1;
  --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #6366f1 50%, #a855f7 100%);
  
  --badge-bg: rgba(56, 189, 248, 0.1);
  --badge-border: rgba(56, 189, 248, 0.25);
  --badge-text: #38bdf8;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(56, 189, 248, 0.15);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 30px;
  --radius-full: 9999px;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

[data-theme="light"] {
  --bg-body: #f8fafc;
  --bg-body-gradient: radial-gradient(circle at 50% 0%, #e2e8f0 0%, #f8fafc 70%);
  --bg-card: rgba(255, 255, 255, 0.8);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-card-border: rgba(0, 0, 0, 0.06);
  --bg-card-border-hover: rgba(99, 102, 241, 0.4);
  --bg-glass: rgba(255, 255, 255, 0.85);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --primary: #0284c7;
  --primary-glow: rgba(2, 132, 199, 0.2);
  --badge-bg: rgba(2, 132, 199, 0.08);
  --badge-border: rgba(2, 132, 199, 0.2);
  --badge-text: #0369a1;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 40px rgba(2, 132, 199, 0.1);
}

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

html {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-body);
  background-image: var(--bg-body-gradient);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Ambient Background Glow */
.ambient-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(120px);
  opacity: 0.4;
  z-index: 0;
}
.ambient-glow-1 {
  top: -100px;
  left: 20%;
  background: radial-gradient(circle, #38bdf8 0%, rgba(99, 102, 241, 0.4) 50%, transparent 70%);
}
.ambient-glow-2 {
  top: 600px;
  right: 10%;
  background: radial-gradient(circle, #10b981 0%, rgba(56, 189, 248, 0.2) 50%, transparent 70%);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Typography Helpers */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
  object-fit: cover;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  color: var(--badge-text);
}

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

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Theme Toggle Button */
.btn-theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.btn-theme-toggle:hover {
  color: var(--text-primary);
  border-color: var(--primary);
  transform: scale(1.05);
}

/* Small Download Nav Button */
.btn-nav-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: var(--primary);
  color: #0b0f17;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-nav-download:hover {
  background: #7dd3fc;
  box-shadow: 0 0 20px var(--primary-glow);
  transform: translateY(-1px);
}

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

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--badge-text);
  margin-bottom: 24px;
  animation: float 4s ease-in-out infinite;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-emerald);
  display: inline-block;
}

.hero-title {
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 36px;
  font-weight: 400;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

/* App Store Official Badge Button */
.btn-appstore {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 12px 28px;
  background: #000;
  color: #fff;
  border-radius: var(--radius-md);
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-fast);
}

.btn-appstore:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.4);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(255, 255, 255, 0.15);
}

.appstore-icon {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

.appstore-text {
  text-align: left;
  display: flex;
  flex-direction: column;
}

.appstore-label {
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  opacity: 0.8;
  line-height: 1;
}

.appstore-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.2;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--bg-card-border-hover);
  transform: translateY(-2px);
}

/* ==========================================================================
   Devices Mockup Stage (iPhone + Apple Watch)
   ========================================================================== */
.mockup-stage {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 40px;
  margin-top: 20px;
  position: relative;
}

/* iPhone Mockup Frame */
.iphone-frame {
  width: 330px;
  height: 670px;
  background: #11141d;
  border-radius: 50px;
  border: 4px solid #334155;
  box-shadow: var(--shadow-lg), 0 0 60px rgba(56, 189, 248, 0.15);
  padding: 12px;
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
}

.iphone-screen {
  width: 100%;
  height: 100%;
  background: #090d16;
  border-radius: 40px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 18px;
  box-sizing: border-box;
  color: #fff;
  font-size: 0.9rem;
}

.dynamic-island {
  width: 90px;
  height: 25px;
  background: #000;
  border-radius: 20px;
  margin: 0 auto 15px;
}

.screen-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.screen-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.screen-input-card {
  background: #151b2a;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 14px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.currency-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1rem;
}

.flag-circle {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #38bdf8;
  color: #0b0f17;
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
}

.screen-input-amount {
  font-size: 1.4rem;
  font-weight: 700;
  color: #38bdf8;
}

.screen-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 4px;
}

.screen-list-item {
  background: #121724;
  border-radius: 14px;
  padding: 12px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.screen-item-val {
  font-weight: 700;
  font-size: 1.05rem;
  text-align: right;
}

.screen-item-rate {
  font-size: 0.72rem;
  color: #64748b;
}

.screen-chart-preview {
  margin-top: auto;
  background: #151b2a;
  border-radius: 16px;
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.chart-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 8px;
}

.chart-tab {
  font-size: 0.65rem;
  padding: 3px 8px;
  border-radius: 6px;
  background: #1e2638;
  color: #94a3b8;
}

.chart-tab.active {
  background: #38bdf8;
  color: #000;
  font-weight: 700;
}

.chart-svg {
  width: 100%;
  height: 50px;
  display: block;
}

/* Apple Watch Mockup Frame */
.watch-frame {
  width: 220px;
  height: 270px;
  background: #1e2430;
  border-radius: 46px;
  border: 4px solid #475569;
  box-shadow: var(--shadow-lg), 0 0 50px rgba(16, 185, 129, 0.2);
  padding: 10px;
  box-sizing: border-box;
  position: relative;
  align-self: center;
}

.watch-screen {
  width: 100%;
  height: 100%;
  background: #000;
  border-radius: 36px;
  padding: 16px 14px;
  box-sizing: border-box;
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.watch-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: #94a3b8;
}

.watch-currency-box {
  text-align: center;
  margin: 10px 0;
}

.watch-base {
  font-size: 0.8rem;
  color: #94a3b8;
}

.watch-target {
  font-size: 1.6rem;
  font-weight: 800;
  color: #10b981;
  line-height: 1.1;
  margin-top: 4px;
}

.watch-currency-label {
  font-size: 0.75rem;
  color: #64748b;
}

.watch-footer-pill {
  background: #181e2b;
  border-radius: 12px;
  padding: 6px 10px;
  font-size: 0.7rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ==========================================================================
   Live Interactive Converter Widget Section
   ========================================================================== */
.converter-section {
  padding: 80px 0 60px;
}

.section-head {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 14px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

.converter-card {
  max-width: 760px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.converter-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
}

.converter-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 20px;
  margin-bottom: 30px;
}

.converter-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.input-box {
  display: flex;
  align-items: center;
  background: var(--bg-body);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  transition: border-color var(--transition-fast);
}

.input-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.currency-select {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  outline: none;
  padding-right: 8px;
}

.currency-select option {
  background: #0f172a;
  color: #fff;
}

.amount-input {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 700;
  outline: none;
  text-align: right;
}

.btn-swap {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card-hover);
  border: 1px solid var(--bg-card-border);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-spring);
  margin-top: 24px;
}

.btn-swap:hover {
  background: var(--primary);
  color: #0b0f17;
  transform: rotate(180deg);
}

.converter-result-box {
  background: var(--bg-body);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.result-formula {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.result-main {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--accent-emerald);
}

.result-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Features 4-Pillars Grid
   ========================================================================== */
.features-section {
  padding: 80px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--bg-card-border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-icon-wrap {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--primary);
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ==========================================================================
   Use Cases Section
   ========================================================================== */
.usecases-section {
  padding: 80px 0;
}

.usecases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.usecase-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: all var(--transition-fast);
}

.usecase-card:hover {
  border-color: var(--primary);
}

.usecase-badge {
  font-size: 1.8rem;
}

.usecase-name {
  font-size: 1.1rem;
  font-weight: 700;
}

.usecase-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Support & FAQ Section (Required for App Store Support URL)
   ========================================================================== */
.support-section {
  padding: 80px 0;
  border-top: 1px solid var(--bg-card-border);
}

.support-container {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 50px;
  align-items: start;
}

.support-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-md);
}

.support-title {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.support-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.support-contact-box {
  background: var(--bg-body);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.support-email-text {
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary);
  text-decoration: none;
}

.btn-copy-email {
  background: var(--bg-card-hover);
  border: 1px solid var(--bg-card-border);
  color: var(--text-primary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-copy-email:hover {
  background: var(--primary);
  color: #0b0f17;
}

.support-meta-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.support-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.faq-question {
  width: 100%;
  background: transparent;
  border: none;
  padding: 18px 22px;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-icon {
  font-size: 1.2rem;
  transition: transform var(--transition-fast);
  color: var(--primary);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
  padding: 0 22px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  padding-bottom: 18px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--bg-body);
  border-top: 1px solid var(--bg-card-border);
  padding: 50px 0 30px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 30px;
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--bg-card-border);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Animations */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 900px) {
  .mockup-stage {
    flex-direction: column;
    align-items: center;
    gap: 30px;
  }
  .watch-frame {
    align-self: center;
  }
  .support-container {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .converter-grid {
    grid-template-columns: 1fr;
  }
  .btn-swap {
    margin: 0 auto;
    transform: rotate(90deg);
  }
  .btn-swap:hover {
    transform: rotate(270deg);
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
  }
  .iphone-frame {
    width: 290px;
    height: 590px;
    border-radius: 40px;
  }
  .converter-card {
    padding: 24px 18px;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .btn-appstore, .btn-secondary {
    width: 100%;
    justify-content: center;
  }
}