/**
 * AudioTools Design System - Base & Layout
 */

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

html {
  font-family: var(--font-family-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text-main);
  background-color: var(--color-bg-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Accessibility: Focus outlines */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 16px;
  background: var(--color-primary);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  z-index: 100;
  transition: top var(--transition-fast);
  text-decoration: none;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
}

.skip-link:focus {
  top: 16px;
}

/* Containers */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.container--tool {
  max-width: var(--container-tool);
}

.container--content {
  max-width: var(--container-content);
}

/* Universal Header & Navigation System */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border, #E2E8F0);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
  width: 100%;
}

.site-header-inner,
.header-inner,
.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  width: 100%;
  max-width: var(--container-max, 1140px);
  margin: 0 auto;
  padding: 0 1.25rem;
  gap: 1rem;
}

@media (max-width: 639px) {
  .site-header-inner,
  .header-inner,
  .header-content {
    height: 58px;
    padding: 0 1rem;
  }
}

.site-logo,
.header-brand,
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text-primary, #0F172A);
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.site-logo img,
.brand-logo img,
.site-logo svg,
.brand-logo svg {
  display: block;
  width: 28px;
  height: 28px;
  color: var(--accent, #7C3AED);
}

.header-brand img,
.header-brand svg {
  display: block;
  height: 38px !important;
  width: auto !important;
  max-width: 180px;
}

.site-logo-text {
  font-weight: 800;
  color: var(--text-primary, #0F172A);
}

.site-nav,
.header-nav,
.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: 4px 0;
}

.site-nav::-webkit-scrollbar,
.header-nav::-webkit-scrollbar,
.nav-menu::-webkit-scrollbar {
  display: none;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.85rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary, #475569);
  text-decoration: none;
  border-radius: 9999px;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--accent, #7C3AED);
  background: var(--bg-surface-secondary, #F8FAFC);
}

.nav-link.active,
.nav-link.is-active {
  color: var(--accent, #7C3AED);
  background: var(--accent-light, #EDE9FE);
  font-weight: 700;
}

.header-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-full);
  background-color: var(--cat-audio-bg);
  color: var(--cat-audio-text);
  border: 1px solid var(--cat-audio-border);
}

/* Breadcrumbs handled by main layout.css */
/* Hero Section */
.hero {
  padding-top: var(--space-8);
  padding-bottom: var(--space-6);
  text-align: center;
}

.hero-badge-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-4);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 14px;
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary-border);
  color: var(--color-primary-active);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
}

.hero-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-extrabold);
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--color-text-main);
  margin-bottom: var(--space-4);
}

@media (min-width: 640px) {
  .hero-title {
    font-size: var(--font-size-4xl);
  }
}

@media (min-width: 1024px) {
  .hero-title {
    font-size: var(--font-size-5xl);
  }
}

.gradient-text {
  background: linear-gradient(135deg, #7C3AED 0%, #4F46E5 50%, #2563EB 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-lead {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

@media (min-width: 640px) {
  .hero-lead {
    font-size: var(--font-size-lg);
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px 18px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  line-height: 1.25;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  user-select: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-primary:active {
  background-color: var(--color-primary-active);
  transform: translateY(0);
}

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

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

.btn-outline {
  background-color: transparent;
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}

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

.btn-outline.is-active {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
}

.btn-success {
  background-color: var(--color-success);
  color: var(--color-text-inverse);
}

.btn-success:hover {
  background-color: #166534;
}

.btn-sm {
  padding: 6px 12px;
  font-size: var(--font-size-xs);
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 14px 24px;
  font-size: var(--font-size-base);
  border-radius: var(--radius-lg);
}

@media (max-width: 639px) {
  .btn-lg {
    padding: 12px 18px;
    font-size: var(--font-size-sm);
    min-height: 48px;
  }
}

/* Sections */
.section {
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
}

.section--soft {
  background-color: var(--color-bg-soft);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

/* Footer */
.site-footer {
  margin-top: auto;
  background-color: var(--color-bg-page);
  border-top: 1px solid var(--color-border);
  padding: var(--space-12) 0 var(--space-8);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

@media (min-width: 768px) {
  .footer-inner {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-brand-desc {
  margin-top: var(--space-3);
  max-width: 380px;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.footer-col-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-main);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-3);
}

.footer-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

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

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
  text-align: center;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

@media (min-width: 640px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* ==========================================================================
   Global FAQ Accordion Component (Consistent Across All Audio Tools)
   ========================================================================== */

.faq-list,
.faq-accordion,
.faq-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 820px;
  margin: 24px auto 0 auto;
  width: 100%;
}

.faq-item {
  background: var(--bg-surface, #FFFFFF);
  border: 1px solid var(--border, var(--color-border, #E2E8F0));
  border-radius: var(--radius-lg, 12px);
  overflow: hidden;
  transition: border-color var(--transition-fast, 150ms ease), box-shadow var(--transition-fast, 150ms ease);
}

.faq-item:hover {
  border-color: var(--accent, #7C3AED);
}

.faq-item.faq-item--open,
.faq-item.open,
.faq-item.active {
  border-color: var(--accent, #7C3AED);
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.08);
}

.faq-question-btn,
.faq-question {
  width: 100%;
  padding: 18px 20px;
  background: transparent;
  border: none;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary, var(--color-text-main, #0F172A));
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  outline: none;
  transition: background var(--transition-fast, 150ms ease), color var(--transition-fast, 150ms ease);
  line-height: 1.45;
  -webkit-appearance: none;
  appearance: none;
  border-radius: 0;
}

.faq-question-btn:hover,
.faq-question:hover {
  background: var(--accent-subtle, rgba(124, 58, 237, 0.04));
  color: var(--accent, #7C3AED);
}

.faq-icon-chevron,
.faq-icon,
.faq-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  min-width: 26px;
  border-radius: 50%;
  background: var(--bg-surface-secondary, #F1F5F9);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-muted, #64748B);
  transition: transform var(--transition-normal, 250ms ease), background var(--transition-fast, 150ms ease), color var(--transition-fast, 150ms ease);
  user-select: none;
  line-height: 1;
}

/* Rotate chevron ▾ */
.faq-item.faq-item--open .faq-icon-chevron,
.faq-item.open .faq-icon-chevron,
.faq-item.active .faq-icon-chevron {
  transform: rotate(180deg);
  color: var(--accent, #7C3AED);
  background: var(--accent-light, #EDE9FE);
}

/* Rotate + symbol */
.faq-item.faq-item--open .faq-toggle,
.faq-item.open .faq-toggle,
.faq-item.active .faq-toggle,
.faq-item.faq-item--open .faq-icon,
.faq-item.open .faq-icon,
.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--accent, #7C3AED);
  background: var(--accent-light, #EDE9FE);
}

.faq-answer-panel,
.faq-answer {
  display: none;
  padding: 0 20px 20px 20px;
  font-size: 0.9375rem;
  color: var(--text-secondary, #475569);
  line-height: 1.65;
  border-top: 1px solid rgba(0, 0, 0, 0.03);
  padding-top: 14px;
}

.faq-answer-panel p,
.faq-answer p {
  margin: 0;
}

.faq-answer-panel p + p,
.faq-answer p + p {
  margin-top: 10px;
}

.faq-item.faq-item--open .faq-answer-panel,
.faq-item.open .faq-answer-panel,
.faq-item.active .faq-answer-panel,
.faq-item.faq-item--open .faq-answer,
.faq-item.open .faq-answer,
.faq-item.active .faq-answer {
  display: block;
}

/* ==========================================================================
   Universal Tool Content & Educational Article Styling
   ========================================================================== */
.tool-content,
.tool-article {
  width: 100%;
  max-width: 920px;
  margin: 0 auto;
  padding: 0 1rem;
}

.content-block {
  background: var(--bg-surface, #FFFFFF);
  border: 1px solid var(--border, #E2E8F0);
  border-radius: var(--radius-xl, 20px);
  padding: 2.25rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.03);
}

@media (max-width: 640px) {
  .content-block {
    padding: 1.5rem;
    border-radius: 16px;
  }
}

.content-block h2 {
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  font-weight: 800;
  color: var(--text-primary, #0F172A);
  margin-bottom: 1rem;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.content-block h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary, #0F172A);
  margin: 1.5rem 0 0.75rem 0;
}

.content-block p {
  font-size: 1rem;
  color: var(--text-secondary, #475569);
  line-height: 1.7;
  margin-bottom: 1.1rem;
}

.content-block p:last-child {
  margin-bottom: 0;
}

.content-block ul,
.content-block ol {
  padding-left: 1.5rem;
  margin: 1rem 0 1.25rem 0;
  color: var(--text-secondary, #475569);
  line-height: 1.7;
}

.content-block li {
  margin-bottom: 0.5rem;
}

.content-block strong {
  color: var(--text-primary, #0F172A);
  font-weight: 700;
}

/* Styled Educational Comparison Table */
.comparison-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border: 1px solid var(--border, #E2E8F0);
  border-radius: 14px;
  overflow: hidden;
  margin: 1.5rem 0;
}

.comparison-table th {
  background: var(--bg-surface-secondary, #F8FAFC);
  color: var(--text-primary, #0F172A);
  font-weight: 700;
  font-size: 0.875rem;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border, #E2E8F0);
}

.comparison-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--separator, #F1F5F9);
  color: var(--text-secondary, #475569);
  font-size: 0.875rem;
  vertical-align: top;
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table tr:hover td {
  background: rgba(124, 58, 237, 0.02);
}

/* ==========================================================================
   Universal Card Components & Directory Grid (Shared Across All Audio Tools)
   ========================================================================== */

/* Step Flow Grid */
.steps-flow {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin: 1.75rem 0 1rem 0;
}

.step-card {
  background: var(--bg-surface-secondary, #F8FAFC);
  border: 1px solid var(--border, #E2E8F0);
  border-radius: 16px;
  padding: 1.5rem;
  position: relative;
  transition: all 0.2s ease;
}

.step-card:hover {
  border-color: var(--accent, #7C3AED);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.06);
}

.step-num,
.step-badge-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent, #7C3AED);
  color: #FFFFFF;
  font-weight: 800;
  font-size: 0.9375rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.step-card h3,
.step-heading {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary, #0F172A);
  margin-bottom: 0.5rem;
}

.step-card p,
.step-body {
  font-size: 0.9rem;
  color: var(--text-secondary, #475569);
  line-height: 1.55;
  margin-bottom: 0;
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.feature-card {
  background: #FFFFFF;
  border: 1px solid var(--border, #E2E8F0);
  border-radius: 16px;
  padding: 1.5rem;
  transition: all 0.2s ease;
}

.feature-card:hover {
  border-color: var(--accent, #7C3AED);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.06);
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary, #0F172A);
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary, #475569);
  line-height: 1.55;
  margin-bottom: 0;
}

/* Format & Data Tables */
.format-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border: 1px solid var(--border, #E2E8F0);
  border-radius: 14px;
  overflow: hidden;
  margin: 1.5rem 0;
}

.format-table th {
  background: var(--bg-surface-secondary, #F8FAFC);
  color: var(--text-primary, #0F172A);
  font-weight: 700;
  font-size: 0.875rem;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border, #E2E8F0);
}

.format-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--separator, #F1F5F9);
  color: var(--text-secondary, #475569);
  font-size: 0.875rem;
  vertical-align: middle;
}

.format-table tr:last-child td {
  border-bottom: none;
}

.format-table tr:hover td {
  background: rgba(124, 58, 237, 0.02);
}

/* Tools Directory Grid */
.tools-directory-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.tool-directory-card {
  display: block;
  background: #FFFFFF;
  border: 1px solid var(--border, #E2E8F0);
  border-radius: 16px;
  padding: 1.5rem;
  text-decoration: none;
  transition: all 0.2s ease;
}

.tool-directory-card:hover {
  border-color: var(--accent, #7C3AED);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(124, 58, 237, 0.08);
}

.tool-directory-badge {
  display: inline-block;
  font-size: 0.725rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  background: var(--accent-light, #EDE9FE);
  color: var(--accent, #7C3AED);
  border-radius: 9999px;
  margin-bottom: 0.75rem;
}

.tool-directory-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary, #0F172A);
  margin-bottom: 0.4rem;
}

.tool-directory-desc {
  font-size: 0.875rem;
  color: var(--text-secondary, #475569);
  line-height: 1.5;
  margin-bottom: 0;
}

/* Footer Universal System */
.site-footer {
  border-top: 1px solid var(--border, #E2E8F0);
  background: var(--bg-surface, #FFFFFF);
  padding: 3rem 0 2rem 0;
  margin-top: 4rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.footer-brand {
  max-width: 360px;
}

.footer-logo {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-primary, #0F172A);
  text-decoration: none;
  display: inline-block;
  margin-bottom: 0.5rem;
}

.footer-tagline {
  font-size: 0.875rem;
  color: var(--text-secondary, #475569);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-col-title {
  font-size: 0.8125rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-primary, #0F172A);
  margin-bottom: 0.5rem;
}

.footer-col a,
.footer-links a {
  font-size: 0.875rem;
  color: var(--text-secondary, #475569);
  text-decoration: none;
  transition: color 0.15s ease;
}

.footer-col a:hover,
.footer-links a:hover {
  color: var(--accent, #7C3AED);
}

.footer-bottom {
  border-top: 1px solid var(--border, #E2E8F0);
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.8125rem;
  color: #94A3B8;
}

.faq-section { margin-top: 2rem; }