/* ==========================================================================
   Uber-Inspired Design System - AUDIOVERTER (audioverter.online)
   Ref: DESIGN.md (High-Contrast, Monochromatic + Electric Blue Accent)
   ========================================================================== */

:root {
  /* Colors (SoundCloud Signature Orange & Uber Monochromatic) */
  --color-primary-cta: #FF5500;
  --color-primary-cta-hover: #E04B00;
  --color-primary-btn-bg: #000000;
  --color-primary-btn-text: #FFFFFF;
  --color-secondary-btn-bg: #FFFFFF;
  --color-secondary-btn-text: #000000;
  --color-tertiary-btn-bg: #EEEEEE;
  --color-tertiary-btn-hover: #E0E0E0;

  --color-text-main: #000000;
  --color-text-secondary: #333333;
  --color-text-tertiary: #757575;
  --color-text-dim: #9E9E9E;

  --color-bg-page: #F8F9FA;
  --color-bg-surface: #FFFFFF;
  --color-bg-secondary: #F3F3F3;
  --color-bg-tertiary: #F6F6F6;

  --color-border: #D8D8D8;
  --color-border-subtle: #E8E8E8;
  --color-border-dark: #000000;
  --color-border-focus: #FF5500;

  --color-error-bg: #FFF1F0;
  --color-error-text: #D93025;
  --color-error-border: #FFCCC7;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;

  /* Radius (0px for containers/inputs, 999px for buttons/pills) */
  --radius-container: 0px;
  --radius-pill: 999px;
  --radius-circle: 50%;

  /* Elevation */
  --shadow-subtle: rgba(0, 0, 0, 0.08) 0px 2px 8px 0px;
  --shadow-hover: rgba(0, 0, 0, 0.12) 0px 4px 14px 0px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* Dark Mode Overrides */
[data-theme="dark"] {
  --color-primary-cta: #FF661A;
  --color-primary-cta-hover: #FF7E3D;
  --color-primary-btn-bg: #FFFFFF;
  --color-primary-btn-text: #000000;
  --color-secondary-btn-bg: #1A1A1A;
  --color-secondary-btn-text: #FFFFFF;
  --color-tertiary-btn-bg: #262626;
  --color-tertiary-btn-hover: #333333;

  --color-text-main: #FFFFFF;
  --color-text-secondary: #E0E0E0;
  --color-text-tertiary: #9E9E9E;
  --color-text-dim: #757575;

  --color-bg-page: #000000;
  --color-bg-surface: #121212;
  --color-bg-secondary: #1A1A1A;
  --color-bg-tertiary: #202020;

  --color-border: #333333;
  --color-border-subtle: #242424;
  --color-border-dark: #FFFFFF;
  --color-border-focus: #FF661A;

  --color-error-bg: #2C1517;
  --color-error-text: #FF7875;
  --color-error-border: #5C1D24;

  --shadow-subtle: rgba(0, 0, 0, 0.4) 0px 2px 8px 0px;
  --shadow-hover: rgba(0, 0, 0, 0.6) 0px 4px 14px 0px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg-page);
  color: var(--color-text-main);
  line-height: 1.5;
  font-size: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

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

button, input, select {
  font-family: inherit;
}

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

.hidden {
  display: none !important;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.navbar {
  background-color: #000000;
  color: #FFFFFF;
  height: 64px;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
  color: #FFFFFF;
}

.brand-name {
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.brand-icon {
  stroke: #FFFFFF;
}

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

.nav-link {
  color: #FFFFFF;
  font-size: 13px;
  font-weight: var(--font-weight-medium);
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  transition: background-color var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.nav-link:hover {
  background-color: #222222;
}

.nav-btn-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: #FFFFFF;
  color: #000000;
  font-size: 12px;
  font-weight: var(--font-weight-bold);
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  transition: opacity var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.nav-btn-pill:hover {
  opacity: 0.88;
}

.icon-btn {
  background: transparent;
  color: #FFFFFF;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-circle);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast);
}

.icon-btn:hover {
  background-color: #222222;
}

/* ==========================================================================
   Main Hero & Card (Inspired by EzConv reference & Uber Cleanliness)
   ========================================================================== */
.main-wrapper {
  flex: 1;
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
  padding: 48px 24px 80px 24px;
}

.hero-section {
  text-align: center;
  margin-bottom: 56px;
}

.hero-title {
  font-size: 42px;
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-text-main);
  margin-bottom: 12px;
}

.hero-subtitle {
  font-size: 17px;
  color: var(--color-text-secondary);
  max-width: 620px;
  margin: 0 auto 36px auto;
  line-height: 1.5;
}

/* Converter Card */
.converter-card {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-subtle);
  padding: 24px;
  max-width: 680px;
  margin: 0 auto 28px auto;
  text-align: left;
}

.input-container {
  display: flex;
  align-items: center;
  position: relative;
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  padding: 4px 8px 4px 14px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.input-container:focus-within {
  background-color: var(--color-bg-surface);
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 1px var(--color-border-focus);
}

.input-icon {
  display: flex;
  align-items: center;
  color: var(--color-text-tertiary);
  margin-right: 10px;
}

.url-input {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--color-text-main);
  font-size: 15px;
  padding: 10px 0;
  outline: none;
  width: 100%;
}

.url-input::placeholder {
  color: var(--color-text-tertiary);
}

.clear-btn {
  background: transparent;
  border: none;
  color: var(--color-text-tertiary);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  padding: 4px 8px;
  margin-right: 4px;
}

.clear-btn:hover {
  color: var(--color-text-main);
}

.paste-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background-color: var(--color-bg-secondary);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: var(--font-weight-medium);
  padding: 6px 12px;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.paste-btn:hover {
  background-color: var(--color-tertiary-btn-hover);
}

/* Options Row */
.form-options-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
  gap: 12px;
  flex-wrap: wrap;
}

.options-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Custom Dropdown (Always Opens Below Button) */
.custom-dropdown {
  position: relative;
  display: inline-flex;
}

.custom-dropdown-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background-color: var(--color-bg-secondary);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 9px 16px;
  font-size: 14px;
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.custom-dropdown-btn:hover {
  background-color: var(--color-tertiary-btn-hover);
}

.custom-dropdown.open .custom-dropdown-btn,
.custom-dropdown-btn:focus-visible {
  border-color: var(--color-border-focus);
}

.custom-dropdown-btn:disabled,
.custom-dropdown-btn.disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.custom-dropdown .select-chevron {
  position: static;
  pointer-events: none;
  stroke: var(--color-text-main);
  opacity: 0.8;
  transition: transform var(--transition-fast);
}

.custom-dropdown.open .select-chevron {
  transform: rotate(180deg);
}

.custom-dropdown-menu {
  position: absolute;
  top: calc(100% + 6px); /* Strictly below the button */
  left: 0;
  min-width: 210px;
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  z-index: 1000;
  padding: 6px 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: dropdownFadeIn 0.15s ease-out;
}

@keyframes dropdownFadeIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

[data-theme="dark"] .custom-dropdown-menu {
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.65);
}

.custom-dropdown-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--color-text-main);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  user-select: none;
}

.custom-dropdown-item:hover {
  background-color: var(--color-bg-secondary);
}

.custom-dropdown-item.active {
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-cta);
  background-color: var(--color-bg-secondary);
}

.custom-dropdown-item .check-icon {
  stroke: var(--color-primary-cta);
  flex-shrink: 0;
}

/* Buttons (Uber Strict Spec) */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--color-primary-btn-bg);
  color: var(--color-primary-btn-text);
  font-size: 14px;
  font-weight: var(--font-weight-medium);
  padding: 10px 22px;
  min-height: 40px;
  border-radius: var(--radius-pill);
  border: none;
  cursor: pointer;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-secondary-btn-bg);
  color: var(--color-secondary-btn-text);
  font-size: 14px;
  font-weight: var(--font-weight-medium);
  padding: 10px 20px;
  min-height: 40px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-dark);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

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

/* Support Banner (Ref Image) */
.support-banner {
  max-width: 680px;
  margin: 0 auto;
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  padding: 12px 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.coffee-icon {
  font-size: 16px;
}

/* Loading & Error States */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 16px;
  gap: 16px;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary-cta);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-message {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.error-alert {
  display: flex;
  align-items: center;
  gap: 12px;
  background-color: var(--color-error-bg);
  color: var(--color-error-text);
  border: 1px solid var(--color-error-border);
  padding: 14px 16px;
  margin-top: 16px;
  font-size: 14px;
}

/* Result Box */
.result-box {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.track-header {
  display: flex;
  gap: 20px;
  align-items: center;
  margin-bottom: 20px;
}

.track-artwork-wrapper {
  position: relative;
  width: 90px;
  height: 90px;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-secondary);
}

.track-artwork {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.track-duration-badge {
  position: absolute;
  bottom: 4px;
  right: 4px;
  background-color: rgba(0, 0, 0, 0.75);
  color: #FFFFFF;
  font-size: 11px;
  font-weight: var(--font-weight-medium);
  padding: 2px 6px;
  border-radius: 2px;
}

.track-details {
  flex: 1;
  min-width: 0;
}

.track-title {
  font-size: 19px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}

.track-artist {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.track-meta-row {
  display: flex;
  gap: 8px;
}

.meta-tag {
  font-size: 12px;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  background-color: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.quality-tag {
  background-color: #FFF2EB;
  color: #FF5500;
  border-color: #FFD4C2;
  font-weight: var(--font-weight-medium);
}

[data-theme="dark"] .quality-tag {
  background-color: #2E1508;
  color: #FFA375;
  border-color: #662E12;
}

/* Audio Preview Player */
.preview-player-container {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  padding: 14px;
  margin-bottom: 20px;
}

.preview-player-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.preview-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-main);
}

.native-audio-player {
  width: 100%;
  height: 38px;
  outline: none;
}

/* Bitrate Selection */
.bitrate-section {
  margin-bottom: 24px;
}

.bitrate-label {
  display: block;
  font-size: 13px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-main);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.bitrate-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.bitrate-pill {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 10px 8px;
  background-color: var(--color-bg-secondary);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.bitrate-pill:hover {
  background-color: var(--color-tertiary-btn-hover);
  border-color: var(--color-text-secondary);
}

.bitrate-pill.active {
  background-color: var(--color-primary-btn-bg);
  color: var(--color-primary-btn-text);
  border-color: var(--color-border-dark);
}

.bitrate-num {
  font-size: 14px;
  font-weight: var(--font-weight-bold);
}

.bitrate-desc {
  font-size: 11px;
  opacity: 0.8;
  margin-top: 2px;
}

/* Download Action */
.download-action-row {
  display: flex;
  gap: 12px;
  align-items: center;
}

.btn-download-primary {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background-color: var(--color-primary-cta);
  color: #FFFFFF;
  font-size: 15px;
  font-weight: var(--font-weight-bold);
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-download-primary:hover {
  background-color: var(--color-primary-cta-hover);
}

.btn-download-primary:active {
  transform: scale(0.98);
}

/* ==========================================================================
   Section: How It Works & FAQ
   ========================================================================== */
.section-container {
  max-width: 820px;
  margin: 64px auto 0 auto;
}

.section-title {
  font-size: 26px;
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.01em;
  margin-bottom: 28px;
  text-align: center;
}

.section-title-sm {
  font-size: 20px;
  font-weight: var(--font-weight-bold);
}

.section-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.btn-text-sm {
  background: none;
  border: none;
  color: var(--color-primary-cta);
  font-size: 13px;
  cursor: pointer;
  text-decoration: underline;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.step-card {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  padding: 24px 20px;
}

.step-number {
  width: 32px;
  height: 32px;
  background-color: var(--color-primary-btn-bg);
  color: var(--color-primary-btn-text);
  font-weight: var(--font-weight-bold);
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-circle);
  margin-bottom: 14px;
}

.step-title {
  font-size: 16px;
  font-weight: var(--font-weight-bold);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 20px;
  background: none;
  border: none;
  font-size: 16px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-main);
  text-align: left;
  cursor: pointer;
}

.faq-chevron {
  transition: transform var(--transition-normal);
  color: var(--color-text-tertiary);
  flex-shrink: 0;
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  display: none;
  padding: 0 20px 18px 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

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

/* ==========================================================================
   Footer (Matching Reference EzConv Layout)
   ========================================================================== */
.footer {
  background-color: var(--color-bg-page);
  border-top: 1px solid var(--color-border);
  padding: 64px 0 32px 0;
  margin-top: 96px;
  color: var(--color-text-main);
}

.footer-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.footer-main {
  display: grid;
  grid-template-columns: 2fr 1.5fr 1.5fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-col-brand .footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 22px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-main);
}

.footer-col-brand .brand-icon {
  stroke: var(--color-text-main);
}

.footer-tagline {
  font-size: 14px;
  color: var(--color-text-tertiary);
  line-height: 1.6;
  max-width: 290px;
  margin-top: 14px;
}

.footer-heading {
  font-size: 16px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-main);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links li a {
  font-size: 14px;
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

.footer-links li a:hover {
  color: var(--color-primary-cta);
  text-decoration: underline;
}

.footer-contact {
  margin-top: 4px;
}

.footer-contact-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

.footer-contact-link:hover {
  color: var(--color-primary-cta);
  text-decoration: underline;
}

.footer-contact-link svg {
  stroke: var(--color-text-tertiary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-copyright {
  font-size: 14px;
  color: var(--color-text-tertiary);
}

.footer-bottom-links {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-bottom-links a {
  font-size: 14px;
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

.footer-bottom-links a:hover {
  color: var(--color-primary-cta);
  text-decoration: underline;
}

/* ==========================================================================
   Sub-Pages Styles: How It Works & Dedicated FAQ
   ========================================================================== */
.subpage-wrapper {
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 48px 24px 80px 24px;
}

.page-header {
  text-align: center;
  margin-bottom: 48px;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  background-color: #FFF2EB;
  color: #FF5500;
  border: 1px solid #FFD4C2;
  margin-bottom: 16px;
}

[data-theme="dark"] .badge-pill {
  background-color: #2E1508;
  color: #FFA375;
  border-color: #662E12;
}

.page-title {
  font-size: 40px;
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  color: var(--color-text-main);
}

.page-subtitle {
  font-size: 17px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: 680px;
  margin: 0 auto;
}

/* Content Article Card */
.content-card {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  padding: 32px 28px;
  margin-bottom: 32px;
}

.content-card-title {
  font-size: 22px;
  font-weight: var(--font-weight-bold);
  margin-bottom: 14px;
  color: var(--color-text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.content-card-title svg {
  stroke: var(--color-primary-cta);
}

.content-card-text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

/* Feature Steps Detailed */
.detailed-steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 36px;
}

.detailed-step-card {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.detailed-step-card:hover {
  border-color: var(--color-primary-cta);
  transform: translateY(-2px);
}

.detailed-step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background-color: var(--color-primary-cta);
  color: #FFFFFF;
  font-size: 16px;
  font-weight: var(--font-weight-bold);
  border-radius: var(--radius-circle);
  margin-bottom: 16px;
}

.detailed-step-title {
  font-size: 18px;
  font-weight: var(--font-weight-bold);
  margin-bottom: 10px;
  color: var(--color-text-main);
}

.detailed-step-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Comparison Table */
.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  margin: 20px 0 28px 0;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}

.data-table th {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-main);
  font-weight: var(--font-weight-bold);
  padding: 14px 18px;
  border-bottom: 1px solid var(--color-border);
}

.data-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--color-border-subtle);
  color: var(--color-text-secondary);
}

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

.data-table tr:hover td {
  background-color: var(--color-bg-secondary);
}

.table-tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: 12px;
  font-weight: var(--font-weight-bold);
  border-radius: var(--radius-pill);
}

.table-tag.tag-orange {
  background-color: #FFF2EB;
  color: #FF5500;
  border: 1px solid #FFD4C2;
}

[data-theme="dark"] .table-tag.tag-orange {
  background-color: #2E1508;
  color: #FFA375;
  border-color: #662E12;
}

.table-tag.tag-gray {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
}

/* Callout Box / Pro Tip */
.pro-tip-box {
  background-color: var(--color-bg-secondary);
  border-left: 4px solid var(--color-primary-cta);
  padding: 18px 22px;
  margin: 24px 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-main);
}

.pro-tip-box strong {
  color: var(--color-primary-cta);
}

/* CTA Box */
.cta-box {
  background-color: #000000;
  color: #FFFFFF;
  padding: 44px 32px;
  text-align: center;
  margin-top: 48px;
  border: 1px solid #222222;
}

[data-theme="dark"] .cta-box {
  background-color: #111111;
  border-color: #2E2E2E;
}

.cta-box-title {
  font-size: 28px;
  font-weight: var(--font-weight-bold);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.cta-box-desc {
  font-size: 16px;
  color: #CCCCCC;
  max-width: 540px;
  margin: 0 auto 24px auto;
  line-height: 1.5;
}

.cta-box .btn-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--color-primary-cta);
  color: #FFFFFF;
  font-size: 15px;
  font-weight: var(--font-weight-bold);
  padding: 13px 30px;
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

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

/* FAQ Search & Category Filter */
.faq-controls {
  margin-bottom: 28px;
}

.faq-search-wrapper {
  position: relative;
  margin-bottom: 18px;
}

.faq-search-input {
  width: 100%;
  padding: 14px 18px 14px 46px;
  font-size: 15px;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-surface);
  color: var(--color-text-main);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-search-input:focus {
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 1px var(--color-border-focus);
}

.faq-search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  stroke: var(--color-text-tertiary);
  pointer-events: none;
}

.faq-categories {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.faq-cat-btn {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.faq-cat-btn:hover {
  background-color: var(--color-tertiary-btn-hover);
}

.faq-cat-btn.active {
  background-color: #000000;
  color: #FFFFFF;
  border-color: #000000;
}

[data-theme="dark"] .faq-cat-btn.active {
  background-color: #FFFFFF;
  color: #000000;
  border-color: #FFFFFF;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 768px) {
  .detailed-steps-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 32px;
  }

  .steps-grid {
    grid-template-columns: 1fr;
  }

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

  .download-action-row {
    flex-direction: column;
  }

  .btn-download-primary, .btn-secondary {
    width: 100%;
  }

  .converter-card {
    padding: 18px 14px;
  }

  .form-options-row {
    flex-direction: column;
    align-items: stretch;
  }

  .options-left {
    justify-content: space-between;
  }

  .options-right .btn-primary {
    width: 100%;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
}

/* ==========================================================================
   ADVERTISEMENT SLOTS (Adsterra & Modular Banners)
   Zero-CLS, Clean Uber Monochromatic Design
   ========================================================================== */
.ad-slot-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 24px auto;
  width: 100%;
  position: relative;
  text-align: center;
}

.ad-slot-top {
  max-width: 728px;
  min-height: 90px;
  margin-top: 6px;
  margin-bottom: 24px;
}

.ad-slot-mid {
  max-width: 300px;
  min-height: 250px;
  margin: 32px auto 16px auto;
}

.ad-slot-result {
  max-width: 300px;
  min-height: 250px;
  margin: 20px auto 16px auto;
}

.ad-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--color-text-dim);
  margin-bottom: 6px;
  display: inline-block;
}

.ad-placeholder {
  width: 100%;
  height: 100%;
  min-height: inherit;
  border: 1px dashed var(--color-border);
  background-color: var(--color-bg-secondary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 16px 20px;
  box-sizing: border-box;
  transition: border-color var(--transition-fast);
}

.ad-placeholder:hover {
  border-color: var(--color-text-tertiary);
}

.ad-placeholder-header {
  margin-bottom: 8px;
}

.ad-placeholder-body {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-text-tertiary);
}

.ad-placeholder-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary-cta);
  opacity: 0.9;
}

.ad-placeholder-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  gap: 2px;
}

.ad-placeholder-text strong {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-main);
}

.ad-placeholder-text span {
  font-size: 11px;
  color: var(--color-text-dim);
}

.ad-iframe-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

@media (max-width: 768px) {
  .ad-slot-top {
    max-width: 320px;
    min-height: 50px;
  }

  .ad-placeholder {
    padding: 10px 14px;
  }

  .ad-placeholder-body {
    flex-direction: row;
    gap: 8px;
  }

  .ad-placeholder-text strong {
    font-size: 12px;
  }

  .ad-placeholder-text span {
    font-size: 10px;
  }
}