:root {
  --font-sans: Arial, Helvetica, sans-serif;
  --color-background: #f4f6ff;
  --color-background-soft: #eef2ff;
  --color-surface: #ffffff;
  --color-surface-alt: #f7f9ff;
  --color-primary: #2ca9a5;
  --color-primary-dark: #2ca9a5;
  --color-primary-contrast: #ffffff;
  --color-secondary: #2ca9a5;
  --color-text: #0f172a;
  --color-text-soft: #334155;
  --color-text-muted: #5b6b84;
  --color-border: #d8e1f8;
  --color-border-strong: #b8c4e8;
  --shadow-sm: 0 6px 14px -8px rgba(15, 23, 42, 0.25);
  --shadow-md: 0 18px 32px -16px rgba(46, 64, 121, 0.25);
  --shadow-lg: 0 32px 56px -24px rgba(46, 64, 121, 0.35);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --layout-max-width: 1120px;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --transition-normal: all 200ms ease;
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  background: radial-gradient(circle at top right, rgba(47, 91, 245, 0.14), transparent 42%), radial-gradient(circle at 15% 20%, rgba(27, 198, 245, 0.12), transparent 38%), var(--color-background);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 180ms ease;
}

a:hover,
a:focus-visible {
  color: var(--color-primary-dark);
}

:root {
  --color-code-bg: #1f2933;
  --color-code-border: rgba(255, 255, 255, 0.08);
  --color-code-text: #e0f2ff;
  --color-code-inline-bg: rgba(44, 169, 165);
  --color-code-inline-text: #f1f5f9;
}

code {
  font-family: 'Source Code Pro', 'SFMono-Regular', Consolas, Menlo, monospace;
  background: var(--color-code-inline-bg);
  color: var(--color-code-inline-text);
  padding: 0.1em 0.45em;
  border-radius: 6px;
  font-size: 0.95em;
}

pre {
  background: var(--color-code-bg);
  color: var(--color-code-text);
  border-radius: 10px;
  border: 1px solid var(--color-code-border);
  padding: 1rem;
  overflow-x: auto;
  margin: 1.25rem 0;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.02);
}

pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: 0.95em;
  line-height: 1.6;
  display: block;
  white-space: pre;
}
header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px) saturate(160%);
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(216, 225, 248, 0.8);
  box-shadow: 0 10px 28px -24px rgba(15, 23, 42, 0.5);
}

header + main {
  margin-top: 0;
}

.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;
}

.top-nav {
  max-width: var(--layout-max-width);
  margin: 0 auto;
  padding: 1.2rem var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  position: relative;
  flex-wrap: nowrap;
}

.top-nav__brand {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  letter-spacing: 0.02em;
  text-decoration: none;
  margin-right: var(--space-md);
}

.top-nav__links {
  display: flex;
  list-style: none;
  gap: var(--space-md);
  margin: 0;
  padding: 0;
  flex: 1;
  align-items: center;
}

.top-nav__links li a {
  position: relative;
  padding: 0.35rem 0.6rem;
  font-weight: 600;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: var(--transition-normal);
}

.top-nav__links li a::after {
  content: '';
  position: absolute;
  inset: auto 12%;
  height: 3px;
  transform: scaleX(0);
  transform-origin: left;
  background: linear-gradient(120deg, var(--color-primary), var(--color-secondary));
  transition: transform 180ms ease;
  border-radius: var(--radius-pill);
  bottom: 4px;
}

.top-nav__links li a:hover::after,
.top-nav__links li a:focus-visible::after {
  transform: scaleX(1);
}

.top-nav__links li a:hover,
.top-nav__links li a:focus-visible {
  color: var(--color-primary-dark);
  background: rgba(47, 91, 245, 0.08);
}

.top-nav__lang {
  appearance: none;
  border: 1px solid rgba(47, 91, 245, 0.18);
  border-radius: var(--radius-pill);
  background: linear-gradient(120deg, rgba(47, 91, 245, 0.12), rgba(27, 198, 245, 0.08));
  color: var(--color-text);
  padding: 0.55rem 2.2rem 0.55rem 1rem;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  transition: var(--transition-normal);
  margin-left: var(--space-md);
}

.top-nav__lang--compact {
  min-width: 6.5rem;
  max-width: 8rem;
}

.top-nav__lang:hover,
.top-nav__lang:focus-visible {
  border-color: rgba(47, 91, 245, 0.4);
  box-shadow: 0 0 0 4px rgba(47, 91, 245, 0.1);
}

.top-nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.3rem;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(47, 91, 245, 0.18);
  background: linear-gradient(120deg, rgba(47, 91, 245, 0.1), rgba(27, 198, 245, 0.06));
  cursor: pointer;
  transition: var(--transition-normal);
}

.top-nav__toggle span {
  display: block;
  width: 1.4rem;
  height: 2px;
  background: var(--color-primary-dark);
  border-radius: 999px;
  transition: transform 200ms ease, opacity 200ms ease;
}

.top-nav__toggle[aria-expanded="true"] span:nth-of-type(2) {
  opacity: 0;
}

.top-nav__toggle[aria-expanded="true"] span:nth-of-type(1) {
  transform: translateY(6px) rotate(45deg);
}

.top-nav__toggle[aria-expanded="true"] span:nth-of-type(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.top-nav__toggle:hover,
.top-nav__toggle:focus-visible {
  border-color: rgba(47, 91, 245, 0.35);
  box-shadow: 0 0 0 4px rgba(47, 91, 245, 0.1);
}

.legal-header-meta {
  max-width: var(--layout-max-width);
  margin: 0 auto var(--space-xs);
  padding: 0 var(--space-md);
}

.legal-header-meta h1 {
  margin-bottom: var(--space-xs);
}

.legal-header-meta p {
  margin: 0 0 var(--space-xs);
  color: var(--color-text-muted);
}

.legal-page-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
  font-size: 0.9rem;
}

.legal-page-links a {
  color: var(--color-primary-dark);
  font-weight: 600;
}

.legal-page-links span {
  color: rgba(15, 23, 42, 0.25);
}

@media (max-width: 960px) {
  .top-nav {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md);
  }

  .top-nav__brand {
    font-size: 1.4rem;
    justify-self: start;
  }

  .top-nav__links {
    position: absolute;
    top: calc(100% + var(--space-xs));
    left: var(--space-md);
    right: var(--space-md);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid rgba(216, 225, 248, 0.8);
    box-shadow: var(--shadow-sm);
    display: none;
    z-index: 15;
  }

  .top-nav__links--open {
    display: flex;
  }

  .top-nav__toggle {
    display: inline-flex;
    justify-self: end;
    margin-left: 0;
  }

  .top-nav__lang {
    padding: 0.36rem 1.3rem 0.36rem 0.72rem;
    margin: 0 auto;
    justify-self: center;
  }

  .top-nav__links {
    grid-column: 1 / -1;
  }
}

@media (max-width: 600px) {
  .top-nav {
    padding: var(--space-xs) var(--space-md);
    align-items: center;
  }

  .top-nav__toggle {
    justify-self: end;
    margin-left: 0;
  }

  .top-nav__lang {
    padding: 0.32rem 1.1rem 0.32rem 0.68rem;
    font-size: 0.82rem;
    margin: 0 auto;
  }

  .top-nav__toggle {
    width: 2.2rem;
    height: 2.2rem;
    gap: 0.25rem;
  }

  .top-nav__toggle span {
    width: 1.2rem;
  }

  .top-nav__links {
    top: calc(100% + var(--space-xs));
    padding: var(--space-sm) var(--space-md);
    gap: var(--space-sm);
  }

  .top-nav__links li a {
    width: 100%;
    font-size: 0.92rem;
    padding: 0.3rem 0.4rem;
  }
}

@media (max-width: 420px) {
  .top-nav {
    align-items: center;
    padding: 0.4rem var(--space-md);
  }

  .top-nav__brand {
    font-size: 1.4rem;
  }

  .top-nav__lang {
    font-size: 0.78rem;
    margin: 0 auto;
    min-width: 6.4rem;
  }

  .top-nav__toggle {
    width: 2rem;
    height: 2rem;
    gap: 0.22rem;
  }

  .top-nav__links {
    padding: var(--space-sm) calc(var(--space-sm) + 0.4rem);
  }

  .top-nav__links li a {
    font-size: 0.88rem;
  }
}

@media (max-width: 360px) {
  .top-nav__lang {
    font-size: 0.74rem;
    padding-right: 1.05rem;
  }

  .top-nav__toggle {
    width: 1.9rem;
    height: 1.9rem;
    gap: 0.18rem;
  }

  .top-nav__toggle span {
    width: 1.05rem;
  }

  .top-nav__links {
    padding: var(--space-xs) var(--space-sm);
  }

  .top-nav__links li a {
    font-size: 0.85rem;
  }
}

@media (max-width: 320px) {
  .top-nav__brand {
    font-size: 1.3rem;
  }

  .top-nav__lang {
    font-size: 0.72rem;
  }

  .top-nav__toggle {
    display: inline-flex;
    width: 1.8rem;
    height: 1.8rem;
    margin-left: auto;
  }
}

main {
  max-width: var(--layout-max-width);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md) var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

main > section {
  border-radius: var(--radius-md);
  background: var(--color-surface);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(216, 225, 248, 0.8);
  transition: transform 220ms ease, box-shadow 220ms ease;
}

main > section:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.intro-section {
  position: relative;
  overflow: hidden;
  padding: 1.75rem 1.5rem;
  color: var(--color-primary-contrast);
  background: rgb(44, 169, 165);
  box-shadow: var(--shadow-md);
  border-radius: 0.5rem;
}

.intro-section::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.15), transparent 55%);
  opacity: 0.8;
  pointer-events: none;
}

.intro-section * {
  position: relative;
  z-index: 1;
}

.intro-section .intro-content {
  display: flex;
  align-items: center;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.intro-section .intro-text {
  flex: 1;
}

.intro-section h1 {
  margin: 0 0 0.625rem 0;
  font-size: clamp(1.5rem, 2.5vw, 1.875rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: #ffffff;
}

.intro-section .intro-image {
  flex-shrink: 0;
  width: clamp(120px, 20%, 180px);
  height: auto;
  border-radius: 0.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.intro-section p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.9);
}

.intro-section code {
  padding: 0.125rem 0.375rem;
  background: rgba(15, 23, 42, 0.35);
  color: #e0e7ff;
  font-size: 0.85rem;
  border-radius: 0.25rem;
}

section h2 {
  margin-top: 0;
  font-size: clamp(1.8rem, 2.4vw, 2.1rem);
  color: var(--color-text);
  letter-spacing: -0.015em;
}

section p {
  margin: 0.75rem 0 1rem;
  color: var(--color-text-soft);
}

section ul,
section ol {
  margin: 1.5rem 0 0;
  padding-left: 1.2rem;
  color: var(--color-text-soft);
}

section ul li,
section ol li {
  margin-bottom: 0.75rem;
}

.section-subtle {
  background: var(--color-surface-alt);
}

.converter-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.converter-section h2 {
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.converter-section form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

#file-input {
  display: none;
}

.drop-area {
  position: relative;
  padding: var(--space-xl) var(--space-md);
  border: 1.5px dashed rgba(47, 91, 245, 0.45);
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, rgba(47, 91, 245, 0.08), rgba(27, 198, 245, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  cursor: pointer;
  transition: var(--transition-normal);
  outline: none;
}

.drop-area:focus-visible {
  box-shadow: 0 0 0 4px rgba(47, 91, 245, 0.15);
  border-color: rgba(47, 91, 245, 0.75);
}

.drop-area.drop-active {
  border-color: rgba(47, 91, 245, 0.8);
  background: linear-gradient(145deg, rgba(47, 91, 245, 0.14), rgba(27, 198, 245, 0.18));
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.drop-area-content {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  align-items: center;
  color: var(--color-text);
}

.drop-area-icon {
  font-size: 2.7rem;
}

.drop-area-title {
  margin: 0;
  font-weight: 700;
  font-size: 1.25rem;
}

.drop-area-subtitle {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.drop-area-button {
  margin-top: 0.9rem;
  padding: 0.7rem 1.8rem;
  border-radius: var(--radius-pill);
  background: linear-gradient(120deg, var(--color-primary), var(--color-secondary));
  color: var(--color-primary-contrast);
  font-weight: 600;
  border: none;
  cursor: pointer;
  box-shadow: 0 10px 20px -12px rgba(47, 91, 245, 0.7);
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.drop-area-button:hover,
.drop-area-button:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 18px 30px -16px rgba(47, 91, 245, 0.65);
}

.queue-panel {
  border-radius: var(--radius-md);
  border: 1px solid rgba(216, 225, 248, 0.9);
  background: var(--color-surface-alt);
  padding: var(--space-md);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8), var(--shadow-sm);
}

.queue-stats {
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.4rem;
}

.queue-feedback {
  min-height: 1.1rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.queue-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  max-height: 240px;
  overflow-y: auto;
}

.queue-item {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(240, 243, 255, 0.96));
  border: 1px solid rgba(216, 225, 248, 0.9);
}

.queue-item-name {
  flex: 1 1 auto;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  word-break: break-word;
}

.queue-item-meta {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.queue-remove {
  border: none;
  background: none;
  color: #f43f5e;
  font-weight: 600;
  cursor: pointer;
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
  transition: background 150ms ease, color 150ms ease;
}

.queue-remove:hover,
.queue-remove:focus-visible {
  background: rgba(244, 63, 94, 0.12);
  color: #be123c;
}

.converter-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 170px;
  padding: 0.85rem 2.2rem;
  border-radius: var(--radius-pill);
  border: none;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 200ms ease, box-shadow 200ms ease, background 200ms ease;
}

.primary-action {
  background: linear-gradient(120deg, var(--color-primary), var(--color-secondary));
  color: var(--color-primary-contrast);
  box-shadow: 0 16px 32px -20px rgba(47, 91, 245, 0.8);
}

.primary-action:not(:disabled):hover,
.primary-action:not(:disabled):focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 22px 36px -18px rgba(47, 91, 245, 0.85);
}

.primary-action:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.secondary-action {
  background: rgba(47, 91, 245, 0.1);
  color: var(--color-primary-dark);
}

.secondary-action:hover,
.secondary-action:focus-visible {
  background: rgba(47, 91, 245, 0.18);
  transform: translateY(-1px);
  box-shadow: 0 12px 24px -18px rgba(47, 91, 245, 0.35);
}

#result {
  text-align: center;
  min-height: 1.8rem;
}

.download-link {
  display: inline-block;
  margin: 0.25rem 0;
  font-weight: 600;
  color: var(--color-primary-dark);
  text-decoration: underline;
}

.tech-section,
.features-section,
.workflow-section,
.comparison-section,
.experience-section,
.steps-section,
.windows-section,
.technical-section,
.use-case-section,
.privacy-section,
.faq-section {
  background: var(--color-surface);
  border: 1px solid rgba(216, 225, 248, 0.9);
}

.tech-section ol,
.workflow-section ol,
.steps-section ol {
  padding-left: 1.4rem;
}

.features-section ul,
.experience-section ul,
.use-case-section ul {
  list-style: none;
  padding-left: 0;
}

.features-section ul li,
.experience-section ul li,
.use-case-section ul li {
  position: relative;
  padding-left: 1.9rem;
}

.features-section ul li::before,
.experience-section ul li::before,
.use-case-section ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.45rem;
  width: 1rem;
  height: 1rem;
  border-radius: 0.4rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  box-shadow: 0 6px 14px -8px rgba(47, 91, 245, 0.7);
}

table {
  width: 100%;
  border-collapse: collapse;
  border-spacing: 0;
  margin: clamp(1.25rem, 3vw, 2rem) 0;
  background: var(--color-surface);
  border: 1px solid rgba(216, 225, 248, 0.9);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

thead {
  background: linear-gradient(120deg, rgba(47, 91, 245, 0.12), rgba(27, 198, 245, 0.12));
}

th,
td {
  padding: 0.95rem 1.15rem;
  text-align: left;
  font-size: 0.95rem;
  color: var(--color-text);
  border-bottom: 1px solid rgba(216, 225, 248, 0.7);
}

th {
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--color-heading);
}

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:nth-child(even) {
  background-color: rgba(47, 91, 245, 0.04);
}

tbody tr:hover {
  background: rgba(47, 91, 245, 0.08);
}

.comparison-section table {
  width: 100%;
  border-collapse: collapse;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.comparison-section thead {
  background: linear-gradient(120deg, rgba(47, 91, 245, 0.14), rgba(27, 198, 245, 0.14));
}

.comparison-section th,
.comparison-section td {
  padding: 1rem 1.15rem;
  text-align: left;
  font-size: 0.95rem;
  border-bottom: 1px solid rgba(216, 225, 248, 0.7);
}

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

.comparison-section tbody tr:hover {
  background: rgba(47, 91, 245, 0.06);
}

.faq-section dl {
  margin: 0;
}

.faq-section dt {
  font-weight: 700;
  color: var(--color-text);
  margin-top: 1.4rem;
}

.faq-section dt:first-of-type {
  margin-top: 0.4rem;
}

.faq-section dd {
  margin: 0.4rem 0 0.8rem 0;
  color: var(--color-text-muted);
}

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

.half-size-image {
  width: 30%;
  height: auto;
  margin: 0 auto;
}

footer {
  margin-top: var(--space-xl);
  background: linear-gradient(135deg, #091026, #101c41 55%, #0a1a39 100%);
  position: relative;
  padding: clamp(2.5rem, 6vw, 3.5rem) clamp(1.5rem, 6vw, 3rem) clamp(2rem, 5vw, 3rem);
  color: rgba(241, 245, 249, 0.88);
}

footer::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 20%, rgba(79, 124, 255, 0.14), transparent 55%),
              radial-gradient(circle at 80% 15%, rgba(0, 235, 190, 0.12), transparent 48%);
  pointer-events: none;
}

footer::after {
  content: '';
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  opacity: 0.6;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  gap: clamp(2rem, 4vw, 2.75rem);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: flex-start;
  flex-wrap: wrap;
}

.footer-brand {
  flex: 0 0 320px;
  max-width: 320px;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.footer-brand-media {
  width: 100%;
}

.footer-logo {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 0.75rem;
  box-shadow: 0 6px 18px rgba(9, 14, 35, 0.45);
  background: rgba(15, 23, 42, 0.35);
  padding: 1.25rem;
}

.footer-brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-brand h2 {
  margin: 0;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  letter-spacing: -0.015em;
  font-weight: 700;
}

.footer-brand .text-primary {
  color: var(--color-secondary);
}

.footer-brand p {
  margin: 0;
  color: rgba(226, 232, 240, 0.78);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: clamp(1.25rem, 3vw, 1.75rem);
  flex: 1 1 420px;
}

.footer-column h3 {
  margin-bottom: 0.95rem;
  font-size: 1.0rem;
  color: white;
}

.footer-column ul {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-column a {
  color: rgba(226, 232, 240, 0.8);
  font-size: 0.95rem;
  transition: color 200ms ease, transform 200ms ease;
}

.footer-column a:hover,
.footer-column a:focus-visible {
  color: #ffffff;
  transform: translateX(2px);
}

.footer-bottom {
  border-top: 1px solid rgba(148, 163, 184, 0.16);
  padding-top: 1.5rem;
  display: flex;
  justify-content: center;
}

.footer-copy {
  font-size: 0.85rem;
  color: rgba(226, 232, 240, 0.65);
  text-align: center;
}

.footer-ad {
  display:flex;
  justify-content: center;
  gap: 5px;
}

@media (max-width: 1024px) {
  nav {
    padding-inline: var(--space-sm);
  }

  main {
    padding: var(--space-xl) var(--space-sm);
  }

  main > section {
    padding: var(--space-lg);
  }
}

@media (max-width: 768px) {
  header {
    position: sticky;
  }

  nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links-container {
    width: 100%;
    justify-content: space-between;
  }

  nav ul {
    flex-wrap: wrap;
    gap: 0.6rem;
  }

  nav ul li a {
    padding-inline: 0.4rem;
  }

  nav select {
    width: 100%;
  }

  main > section {
    padding: var(--space-md);
  }

  .intro-section .intro-content {
    flex-direction: column;
    gap: 1rem;
  }
  
  .intro-section .intro-image {
    width: clamp(100px, 30%, 150px);
    order: -1; /* 图片移到顶部 */
  }

  .converter-actions {
    flex-direction: column;
  }

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

  .footer-top {
    flex-direction: column;
    align-items: stretch;
    gap: 2rem;
  }

  .footer-brand {
    max-width: 100%;
    flex: 1 1 auto;
  }

  .footer-logo {
    max-width: 220px;
    padding: 1rem;
  }

  .footer-links {
    width: 100%;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }

  .footer-bottom {
    padding-top: 1.25rem;
  }
}

@media (max-width: 540px) {
  body {
    line-height: 1.6;
  }

  .drop-area {
    padding: var(--space-lg) var(--space-sm);
  }

  .queue-panel {
    padding: var(--space-sm);
  }

  .queue-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .comparison-section table,
  .comparison-section thead {
    display: block;
  }

  .comparison-section tr {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.5rem;
    padding: 1rem 0.6rem;
  }

  .comparison-section th,
  .comparison-section td {
    border-bottom: none;
    padding: 0;
  }

  .comparison-section tbody tr {
    border-bottom: 1px solid rgba(216, 225, 248, 0.7);
  }

  .comparison-section tbody tr:last-child {
    border-bottom: none;
  }
}