/* PhraseEcho Site Common Styles */
:root {
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --primary-light: #EEF2FF;
  --text-main: #0F172A;
  --text-muted: #64748B;
  --bg-page: #F8FAFC;
  --bg-card: #FFFFFF;
  --border-color: #E2E8F0;
  --border-subtle: #F1F5F9;
  --accent: #10B981;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --container-width: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #6366F1;
    --primary-hover: #818CF8;
    --primary-light: rgba(99, 102, 241, 0.15);
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --bg-page: #0B0F19;
    --bg-card: #151C2C;
    --border-color: #232E42;
    --border-subtle: #1C2436;
    --accent: #34D399;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5);
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overflow-wrap: break-word;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--primary-hover);
}

/* Header & Nav */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}

@media (prefers-color-scheme: dark) {
  .header {
    background-color: rgba(11, 15, 25, 0.85);
  }
}

.nav-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-main);
}

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary), #8B5CF6);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  font-size: 1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  display: inline-block;
  padding: 0.25rem 0;
}

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

/* Main Container */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

.content-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
}

/* Typography */
h1 {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-top: 2rem;
  margin-bottom: 0.8rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
  color: var(--text-muted);
}

.lead {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 680px;
  margin-bottom: 2rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #6366F1);
  color: #FFF;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.btn-primary:hover {
  background: var(--primary-hover);
  color: #FFF;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

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

/* Footer */
.footer {
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 3rem 1.5rem;
  margin-top: auto;
}

.footer-container {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
  text-align: center;
}

.footer-nav {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-nav a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--border-subtle);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
}

.lang-switch a {
  color: var(--text-muted);
  padding: 0.2rem 0.45rem;
  border-radius: 4px;
  text-decoration: none;
  display: inline-block;
}

.lang-switch a:hover {
  color: var(--primary);
}

.lang-switch a.active {
  color: var(--primary);
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
}

.lang-divider {
  color: var(--border-color);
  font-size: 0.75rem;
}

/* Support Email Box & Anti-Scraping */
.email-support-card {
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.email-copy-container {
  display: flex;
  align-items: stretch;
  gap: 0.6rem;
  max-width: 540px;
  flex-wrap: wrap;
}

.email-input-box {
  flex: 1;
  min-width: 240px;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--bg-card);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s ease;
}

.email-input-box:hover {
  border-color: var(--primary);
}

.email-icon {
  color: var(--primary);
  font-size: 1.1rem;
}

.email-text {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  user-select: all;
  letter-spacing: -0.01em;
  word-break: break-all;
}

.btn-copy {
  padding: 0.75rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--primary);
  color: #FFF;
  border: none;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(79, 70, 229, 0.25);
  transition: all 0.2s ease;
}

.btn-copy:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-client-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 3px;
  padding: 0.3rem 0;
  transition: color 0.2s ease;
}

.btn-client-link:hover {
  color: var(--primary);
}

.email-template-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
}

.email-template-box h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.email-template-box ul {
  margin-left: 1.25rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.email-template-box li {
  margin-bottom: 0.35rem;
}


/* Responsive */
@media (max-width: 768px) {
  .nav-container {
    padding: 0.85rem 1.25rem;
    flex-direction: column;
    gap: 0.75rem;
    align-items: stretch;
  }
  .nav-right {
    justify-content: space-between;
    width: 100%;
    gap: 0.75rem;
  }
  .nav-links {
    gap: 0.85rem;
    flex-wrap: wrap;
  }
  .container {
    padding: 2.25rem 1.25rem 4rem;
  }
  .content-card {
    padding: 1.75rem 1.25rem;
  }
  h1 {
    font-size: 2.1rem;
  }
  h2 {
    font-size: 1.45rem;
  }
}

@media (max-width: 540px) {
  .nav-container {
    padding: 0.65rem 1rem;
    gap: 0.5rem;
  }
  .logo-link {
    font-size: 1.15rem;
    gap: 0.5rem;
  }
  .logo-icon {
    width: 28px;
    height: 28px;
    font-size: 0.9rem;
  }
  .nav-right {
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
  }
  .nav-links {
    gap: 0.6rem;
  }
  .nav-links a {
    font-size: 0.88rem;
    padding: 0.3rem 0.15rem;
  }
  .lang-switch {
    font-size: 0.75rem;
    padding: 0.15rem 0.45rem;
  }
  .lang-switch a {
    padding: 0.2rem 0.4rem;
  }
  .container {
    padding: 1.5rem 1rem 3.5rem;
  }
  .content-card {
    padding: 1.25rem 1rem;
    border-radius: var(--radius-md);
  }
  h1 {
    font-size: 1.85rem;
    margin-bottom: 0.75rem;
  }
  h2 {
    font-size: 1.35rem;
    margin-top: 1.5rem;
  }
  h3 {
    font-size: 1.1rem;
  }
  .lead {
    font-size: 1.05rem;
    margin-bottom: 1.5rem;
  }
  .btn {
    padding: 0.7rem 1.25rem;
    font-size: 0.95rem;
  }
  .footer {
    padding: 2.25rem 1rem;
  }
  .footer-nav {
    gap: 1rem;
  }

  /* Support Email Box Mobile Adaptations */
  .email-support-card {
    padding: 1.25rem 1rem;
    gap: 1.25rem;
  }
  .email-copy-container {
    flex-direction: column;
    width: 100%;
  }
  .email-input-box {
    min-width: 0;
    width: 100%;
    padding: 0.7rem 0.85rem;
  }
  .email-text {
    font-size: 0.95rem;
  }
  .btn-copy {
    width: 100%;
    justify-content: center;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
  }
  .email-template-box {
    padding: 1rem 0.85rem;
  }
  .email-template-box ul {
    margin-left: 1.15rem;
    font-size: 0.85rem;
  }
}