:root {
    --primary: #1877f2;
    --primary-dark: #1565d8;
    --navy: #0d2b57;
    --page-bg: #f4f8ff;
    --card-bg: #eef6ff;
    --border-soft: #bfdbfe;
    --overlay: #5f91db66;
    --white: #ffffff;
    --text: #172033;
    --muted: #64748b;
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --shadow-xs: 0 1px 2px rgba(13, 43, 87, 0.05), 0 2px 6px rgba(13, 43, 87, 0.06);
    --shadow-sm: 0 2px 6px rgba(13, 43, 87, 0.06), 0 6px 16px rgba(24, 119, 242, 0.10);
    --shadow-md: 0 4px 10px rgba(13, 43, 87, 0.07), 0 12px 28px rgba(24, 119, 242, 0.14);
    --shadow-lg: 0 8px 18px rgba(13, 43, 87, 0.08), 0 20px 44px rgba(24, 119, 242, 0.18);
    --shadow-xl: 0 12px 24px rgba(13, 43, 87, 0.10), 0 30px 64px rgba(24, 119, 242, 0.22);
    --shadow-glow: inset 0 1px 0 rgba(255, 255, 255, 0.28), 0 6px 16px rgba(24, 119, 242, 0.32), 0 14px 34px rgba(21, 101, 216, 0.22);
    --shadow-glow-hover: inset 0 1px 0 rgba(255, 255, 255, 0.32), 0 10px 22px rgba(24, 119, 242, 0.42), 0 20px 46px rgba(21, 101, 216, 0.30);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
    background-color: var(--page-bg);
    background-image: radial-gradient(ellipse 90% 60% at 50% -10%, rgba(24, 119, 242, 0.10), transparent), radial-gradient(ellipse 50% 40% at 90% 100%, rgba(24, 119, 242, 0.05), transparent);
    color: var(--text);
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: rgba(24, 119, 242, 0.22);
    color: var(--text);
}

::-webkit-scrollbar {
    width: 11px;
}

::-webkit-scrollbar-track {
    background: #e7f0fe;
}

::-webkit-scrollbar-thumb {
    background: #bfdbfe;
    border-radius: 8px;
    border: 2px solid #e7f0fe;
}

::-webkit-scrollbar-thumb:hover {
    background: #1877f2;
}

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

a {
    color: var(--primary-dark);
    text-decoration: none;
    transition: color 0.25s var(--ease-smooth);
}

a:hover {
    text-decoration: underline;
}

:focus-visible {
    outline: 3px solid rgba(24, 119, 242, 0.55);
    outline-offset: 2px;
    border-radius: 6px;
}

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 20px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 500;
    background: linear-gradient(135deg, rgba(24, 119, 242, 0.94), rgba(21, 101, 216, 0.96));
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    box-shadow: 0 2px 10px rgba(13, 43, 87, 0.10), 0 8px 26px rgba(13, 43, 87, 0.16);
}

.site-header::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--white);
    transition: transform 0.3s var(--ease-smooth);
}

.logo:hover {
    text-decoration: none;
    transform: translateY(-1px);
}

.logo-icon {
    flex-shrink: 0;
    filter: drop-shadow(0 2px 4px rgba(13, 43, 87, 0.20));
    transition: transform 0.4s var(--ease-spring);
}

.logo:hover .logo-icon {
    transform: scale(1.08) rotate(-3deg);
}

.logo-text {
    font-size: 21px;
    font-weight: 800;
    letter-spacing: -0.3px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 26px;
}

.main-nav a {
    color: var(--white);
    font-size: 15px;
    font-weight: 500;
    opacity: 0.92;
    position: relative;
    padding-bottom: 4px;
    transition: opacity 0.25s var(--ease-smooth), transform 0.25s var(--ease-smooth);
}

.main-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 2px;
    border-radius: 2px;
    background: var(--white);
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.3s var(--ease-smooth);
}

.main-nav a:hover {
    opacity: 1;
    text-decoration: none;
    transform: translateY(-1px);
}

.main-nav a:hover::after {
    transform: scaleX(1);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    padding: 10px;
    transition: background-color 0.25s var(--ease-smooth);
}

.menu-toggle:hover {
    background: rgba(255, 255, 255, 0.16);
}

.menu-toggle .bar {
    display: block;
    width: 100%;
    height: 3px;
    border-radius: 3px;
    background: var(--white);
    transition: transform 0.35s var(--ease-spring), opacity 0.25s var(--ease-smooth);
}

body.menu-open .bar-top {
    transform: translateY(8px) rotate(45deg);
}

body.menu-open .bar-middle {
    opacity: 0;
}

body.menu-open .bar-bottom {
    transform: translateY(-8px) rotate(-45deg);
}

.menu-overlay {
    position: fixed;
    inset: 0;
    background: var(--overlay);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s var(--ease-smooth);
    z-index: 900;
}

body.menu-open .menu-overlay {
    opacity: 1;
    pointer-events: auto;
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: 0;
    height: 100%;
    width: min(320px, 85vw);
    background: var(--white);
    padding: 84px 18px 24px;
    transform: translateX(100%);
    transition: transform 0.4s var(--ease-smooth);
    z-index: 950;
    box-shadow: -8px 0 24px rgba(13, 43, 87, 0.16), -16px 0 48px rgba(13, 43, 87, 0.14);
    display: flex;
    flex-direction: column;
    gap: 10px;
    overflow-y: auto;
}

body.menu-open .mobile-menu {
    transform: translateX(0);
}

.menu-close {
    position: fixed;
    top: 16px;
    right: 16px;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 50%;
    background: var(--white);
    box-shadow: 0 4px 10px rgba(13, 43, 87, 0.18), 0 10px 24px rgba(13, 43, 87, 0.14);
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 980;
    transition: transform 0.25s var(--ease-spring), box-shadow 0.25s var(--ease-smooth);
}

body.menu-open .menu-close {
    display: flex;
}

.menu-close:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: 0 6px 14px rgba(13, 43, 87, 0.22), 0 14px 30px rgba(13, 43, 87, 0.16);
}

.menu-title {
    color: var(--primary-dark);
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 6px;
}

.menu-link {
    display: block;
    background: var(--white);
    border: 1px solid var(--border-soft);
    border-radius: 12px;
    padding: 12px 16px;
    color: var(--primary-dark);
    font-weight: 600;
    font-size: 15px;
    box-shadow: var(--shadow-xs);
    opacity: 0;
    transform: translateX(24px);
    transition: opacity 0.4s var(--ease-smooth), transform 0.4s var(--ease-smooth), background-color 0.25s var(--ease-smooth), box-shadow 0.25s var(--ease-smooth);
}

body.menu-open .menu-link {
    opacity: 1;
    transform: translateX(0);
}

body.menu-open .menu-link:nth-child(2) {
    transition-delay: 0.05s;
}

body.menu-open .menu-link:nth-child(3) {
    transition-delay: 0.10s;
}

body.menu-open .menu-link:nth-child(4) {
    transition-delay: 0.15s;
}

body.menu-open .menu-link:nth-child(5) {
    transition-delay: 0.20s;
}

body.menu-open .menu-link:nth-child(6) {
    transition-delay: 0.25s;
}

.menu-link:hover {
    text-decoration: none;
    background: var(--card-bg);
    box-shadow: var(--shadow-sm);
    transform: translateX(4px);
}

.menu-link:active {
    transform: scale(0.98);
}

.hero {
    text-align: center;
    padding: 44px 0 10px;
}

.hero h1 {
    font-size: 40px;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(120deg, #172033 20%, #1565d8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: heroFadeUp 0.6s var(--ease-smooth) both;
}

.hero-description {
    max-width: 640px;
    margin: 12px auto 28px;
    color: var(--muted);
    font-size: 17px;
    animation: heroFadeUp 0.6s var(--ease-smooth) 0.08s both;
}

.tool-card {
    max-width: 640px;
    margin: 0 auto;
    background: linear-gradient(180deg, #ffffff, #fdfeff);
    border: 1px solid var(--border-soft);
    border-radius: 20px;
    padding: 22px;
    box-shadow: inset 0 1px 0 var(--white), var(--shadow-lg);
    transition: box-shadow 0.35s var(--ease-smooth), border-color 0.35s var(--ease-smooth);
    animation: heroFadeUp 0.6s var(--ease-smooth) 0.16s both;
}

.tool-card:focus-within {
    border-color: rgba(24, 119, 242, 0.55);
    box-shadow: inset 0 1px 0 var(--white), var(--shadow-xl);
}

.input-row {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--card-bg);
    border: 2px solid var(--border-soft);
    border-radius: 14px;
    padding: 12px 14px;
    transition: border-color 0.25s var(--ease-smooth), box-shadow 0.25s var(--ease-smooth), background-color 0.25s var(--ease-smooth);
}

.input-row:focus-within {
    border-color: var(--primary);
    background: var(--white);
    box-shadow: 0 0 0 5px rgba(24, 119, 242, 0.14), var(--shadow-sm);
}

.input-icon {
    display: flex;
    flex-shrink: 0;
}

.url-input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    font-size: 16px;
    font-family: inherit;
    color: var(--text);
    min-width: 0;
}

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

.btn-clear {
    display: none;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    cursor: pointer;
    padding: 4px;
    border-radius: 8px;
    flex-shrink: 0;
    transition: background-color 0.2s var(--ease-smooth), transform 0.25s var(--ease-spring);
}

.btn-clear:hover {
    background: var(--border-soft);
    transform: rotate(90deg);
}

.btn-clear:active {
    transform: rotate(90deg) scale(0.9);
}

.input-has-value .btn-clear {
    display: flex;
}

.action-row {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: none;
    border-radius: 13px;
    font-family: inherit;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    padding: 13px 24px;
    transition: background-color 0.3s var(--ease-smooth), transform 0.25s var(--ease-spring), box-shadow 0.3s var(--ease-smooth), border-color 0.3s var(--ease-smooth);
}

.btn:active {
    transform: translateY(1px) scale(0.99);
}

.btn-primary {
    flex: 1;
    background: linear-gradient(180deg, #4a97f6, #1877f2 55%, #1565d8);
    color: var(--white);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    background: linear-gradient(180deg, #1877f2, #1565d8);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-hover);
}

.btn-primary:active {
    transform: translateY(0) scale(0.99);
    box-shadow: inset 0 2px 4px rgba(13, 43, 87, 0.25), 0 4px 12px rgba(24, 119, 242, 0.30);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--primary-dark);
    border: 1px solid var(--border-soft);
    box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
    background: var(--border-soft);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:active {
    transform: translateY(0) scale(0.99);
}

.btn[disabled] {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-ghost {
    background: transparent;
    color: var(--primary-dark);
    border: 1px solid var(--border-soft);
}

.btn-ghost:hover {
    background: var(--card-bg);
    box-shadow: var(--shadow-xs);
}

.hint-text {
    margin-top: 14px;
    font-size: 13.5px;
    color: var(--muted);
    text-align: center;
}

.examples {
    max-width: 640px;
    margin: 22px auto 0;
    text-align: left;
    animation: heroFadeUp 0.6s var(--ease-smooth) 0.24s both;
}

.examples-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--muted);
    margin-bottom: 8px;
}

.examples-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 6px 18px;
}

.examples-list li {
    font-size: 13px;
    color: var(--muted);
    font-family: 'Courier New', monospace;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.loading-card {
    max-width: 640px;
    margin: 26px auto 0;
    background: linear-gradient(180deg, #ffffff, #fbfdff);
    border: 2px solid var(--primary);
    border-radius: 20px;
    padding: 26px;
    box-shadow: inset 0 1px 0 var(--white), var(--shadow-lg);
    animation: fadeIn 0.45s var(--ease-smooth);
}

.loading-top {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 18px;
}

.spinner {
    animation: spin 0.9s linear infinite;
    filter: drop-shadow(0 2px 6px rgba(24, 119, 242, 0.35));
}

.status-text {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary-dark);
}

.progress-track {
    height: 8px;
    background: var(--card-bg);
    border-radius: 6px;
    overflow: hidden;
    box-shadow: inset 0 1px 2px rgba(13, 43, 87, 0.08);
}

.progress-bar {
    height: 100%;
    width: 6%;
    background: linear-gradient(90deg, #4d9df7, #1877f2, #4d9df7);
    background-size: 200% 100%;
    border-radius: 6px;
    transition: width 1s var(--ease-smooth);
    box-shadow: 0 0 10px rgba(24, 119, 242, 0.45);
    animation: progressShine 1.4s linear infinite;
}

.result-wrap {
    max-width: 640px;
    margin: 26px auto 0;
    animation: fadeIn 0.45s var(--ease-smooth);
}

.video-head {
    display: flex;
    gap: 14px;
    align-items: center;
    background: var(--white);
    border: 1px solid var(--border-soft);
    border-radius: 18px;
    padding: 14px;
    margin-bottom: 14px;
    box-shadow: inset 0 1px 0 var(--white), var(--shadow-md);
}

.video-thumb {
    width: 120px;
    height: 68px;
    object-fit: cover;
    border-radius: 10px;
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
    transition: transform 0.35s var(--ease-smooth);
}

.video-head:hover .video-thumb {
    transform: scale(1.04);
}

.video-title {
    font-size: 15.5px;
    font-weight: 600;
    color: var(--text);
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}

.result-card {
    position: relative;
    background: var(--white);
    border: 1px solid var(--border-soft);
    border-radius: 18px;
    padding: 18px;
    margin-bottom: 14px;
    box-shadow: inset 0 1px 0 var(--white), var(--shadow-md);
    transition: box-shadow 0.3s var(--ease-smooth), transform 0.3s var(--ease-smooth), border-color 0.3s var(--ease-smooth);
}

.result-card:hover {
    transform: translateY(-3px);
    box-shadow: inset 0 1px 0 var(--white), var(--shadow-lg);
    border-color: rgba(24, 119, 242, 0.45);
}

.result-card.is-hd {
    background: linear-gradient(180deg, #f3f9ff, var(--card-bg));
    border: 2px solid var(--primary);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8), var(--shadow-glow);
}

.result-card.is-hd:hover {
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8), var(--shadow-glow-hover);
}

.badge {
    position: absolute;
    top: -12px;
    right: 14px;
    background: linear-gradient(135deg, #4a97f6, #1565d8);
    color: var(--white);
    font-size: 12px;
    font-weight: 700;
    border-radius: 999px;
    padding: 4px 12px;
    letter-spacing: 0.3px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.30), 0 3px 10px rgba(24, 119, 242, 0.45);
}

.format-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    flex-wrap: wrap;
}

.format-label {
    display: block;
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
}

.format-quality {
    display: block;
    font-size: 14px;
    color: var(--muted);
    margin-top: 2px;
}

.error-card {
    max-width: 640px;
    margin: 26px auto 0;
    background: var(--white);
    border: 2px solid #fecaca;
    border-radius: 18px;
    padding: 20px;
    text-align: center;
    color: #991b1b;
    font-weight: 600;
    box-shadow: inset 0 1px 0 var(--white), 0 6px 16px rgba(153, 27, 27, 0.10), 0 16px 36px rgba(153, 27, 27, 0.08);
    animation: fadeIn 0.45s var(--ease-smooth);
}

.ad-box {
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(238, 246, 255, 0.55);
    border: 1.5px dashed var(--border-soft);
    border-radius: 16px;
    margin: 30px 0;
    min-height: 92px;
    padding: 16px;
}

.ad-box span {
    color: var(--muted);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

.features-section {
    text-align: center;
    margin-bottom: 12px;
}

.features-section h2,
.steps-section h2,
.seo-section h2,
.faq-section h2 {
    font-size: 26px;
    font-weight: 800;
    letter-spacing: -0.3px;
    margin-bottom: 22px;
    color: var(--text);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.feature-card {
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg, #ffffff, #fdfeff);
    border: 1px solid var(--border-soft);
    border-radius: 18px;
    padding: 24px 20px;
    text-align: center;
    box-shadow: inset 0 1px 0 var(--white), var(--shadow-sm);
    transition: transform 0.35s var(--ease-spring), box-shadow 0.35s var(--ease-smooth), border-color 0.35s var(--ease-smooth);
}

.feature-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 22%;
    right: 22%;
    height: 3px;
    border-radius: 0 0 4px 4px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    opacity: 0;
    transform: scaleX(0.4);
    transition: opacity 0.35s var(--ease-smooth), transform 0.35s var(--ease-smooth);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: inset 0 1px 0 var(--white), var(--shadow-lg);
    border-color: rgba(24, 119, 242, 0.45);
}

.feature-card:hover::before {
    opacity: 1;
    transform: scaleX(1);
}

.feature-card:active {
    transform: translateY(-4px);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 58px;
    height: 58px;
    border-radius: 16px;
    background: linear-gradient(180deg, #f3f9ff, var(--card-bg));
    border: 1px solid rgba(191, 219, 254, 0.7);
    margin-bottom: 14px;
    box-shadow: var(--shadow-xs);
    transition: transform 0.4s var(--ease-spring), box-shadow 0.35s var(--ease-smooth);
}

.feature-card:hover .feature-icon {
    transform: scale(1.14) rotate(-3deg);
    box-shadow: 0 6px 16px rgba(24, 119, 242, 0.22);
}

.feature-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14.5px;
    color: var(--muted);
}

.steps-section {
    margin: 44px 0;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.step-card {
    background: linear-gradient(180deg, #ffffff, #fdfeff);
    border: 1px solid var(--border-soft);
    border-radius: 18px;
    padding: 24px 20px;
    text-align: center;
    box-shadow: inset 0 1px 0 var(--white), var(--shadow-sm);
    transition: transform 0.35s var(--ease-smooth), box-shadow 0.35s var(--ease-smooth), border-color 0.35s var(--ease-smooth);
}

.step-card:hover {
    transform: translateY(-5px);
    box-shadow: inset 0 1px 0 var(--white), var(--shadow-md);
    border-color: rgba(24, 119, 242, 0.40);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4a97f6, #1565d8);
    color: var(--white);
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 14px;
    box-shadow: var(--shadow-glow);
    transition: transform 0.4s var(--ease-spring), box-shadow 0.35s var(--ease-smooth);
}

.step-card:hover .step-number {
    transform: scale(1.14);
    box-shadow: var(--shadow-glow-hover);
}

.step-card h3 {
    font-size: 16.5px;
    font-weight: 700;
    margin-bottom: 8px;
}

.step-card p {
    font-size: 14.5px;
    color: var(--muted);
}

.seo-section {
    background: var(--white);
    border: 1px solid var(--border-soft);
    border-radius: 20px;
    padding: 28px;
    margin-bottom: 26px;
    box-shadow: inset 0 1px 0 var(--white), var(--shadow-sm);
    transition: box-shadow 0.35s var(--ease-smooth), border-color 0.35s var(--ease-smooth);
}

.seo-section:hover {
    box-shadow: inset 0 1px 0 var(--white), var(--shadow-md);
    border-color: rgba(24, 119, 242, 0.35);
}

.seo-section p {
    margin-bottom: 14px;
    color: #334155;
    font-size: 15.5px;
}

.seo-section p:last-child {
    margin-bottom: 0;
}

.faq-section {
    margin-bottom: 30px;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--white);
    border: 1px solid var(--border-soft);
    border-radius: 16px;
    box-shadow: var(--shadow-xs);
    overflow: hidden;
    transition: box-shadow 0.3s var(--ease-smooth), border-color 0.3s var(--ease-smooth), transform 0.3s var(--ease-smooth);
}

.faq-item:hover {
    box-shadow: var(--shadow-sm);
    border-color: rgba(24, 119, 242, 0.40);
    transform: translateY(-2px);
}

.faq-heading {
    font-size: 16px;
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    width: 100%;
    background: transparent;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    text-align: left;
    padding: 18px;
    transition: background-color 0.3s var(--ease-smooth), padding 0.35s var(--ease-smooth), color 0.3s var(--ease-smooth);
}

.faq-question:hover {
    background: var(--card-bg);
}

.faq-question[aria-expanded="true"] {
    padding: 18px 18px 12px;
    color: var(--primary-dark);
}

.faq-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform 0.4s var(--ease-spring);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(135deg);
}

.faq-answer {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.45s var(--ease-smooth), opacity 0.4s var(--ease-smooth), padding 0.4s var(--ease-smooth);
    padding: 0 18px;
}

.faq-answer.is-open {
    max-height: 420px;
    opacity: 1;
    padding: 0 18px 18px;
}

.faq-answer p {
    font-size: 15px;
    color: #334155;
}

.page-content {
    max-width: 820px;
    margin: 0 auto;
    padding: 40px 0 20px;
}

.page-content h1 {
    font-size: 32px;
    font-weight: 800;
    letter-spacing: -0.4px;
    margin-bottom: 20px;
}

.page-content h2 {
    font-size: 22px;
    font-weight: 700;
    margin: 28px 0 12px;
}

.page-content h3 {
    font-size: 17.5px;
    font-weight: 700;
    margin: 20px 0 8px;
}

.page-content p {
    margin-bottom: 14px;
    color: #334155;
    font-size: 15.5px;
}

.page-content ul,
.page-content ol {
    margin: 0 0 16px 22px;
    color: #334155;
    font-size: 15.5px;
}

.page-content li {
    margin-bottom: 8px;
}

.page-content .content-card {
    background: var(--white);
    border: 1px solid var(--border-soft);
    border-radius: 20px;
    padding: 30px;
    box-shadow: inset 0 1px 0 var(--white), var(--shadow-md);
}

.page-content .inline-form {
    background: var(--card-bg);
    border: 1px solid var(--border-soft);
    border-radius: 16px;
    padding: 20px;
    margin: 18px 0;
}

.page-content .inline-form input {
    width: 100%;
    border: 2px solid var(--border-soft);
    border-radius: 10px;
    padding: 12px 14px;
    font-family: inherit;
    font-size: 15px;
    outline: none;
    transition: border-color 0.25s var(--ease-smooth), box-shadow 0.25s var(--ease-smooth);
}

.page-content .inline-form input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(24, 119, 242, 0.12);
}

.site-footer {
    position: relative;
    background: linear-gradient(180deg, #0d2b57, #0a2348);
    color: #cfe0f5;
    margin-top: 50px;
}

.site-footer::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(95, 145, 219, 0.55), transparent);
}

.footer-inner {
    display: flex;
    gap: 40px;
    justify-content: space-between;
    padding: 44px 20px 30px;
    flex-wrap: wrap;
}

.footer-brand {
    max-width: 340px;
}

.footer-logo {
    color: var(--white);
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 10px;
}

.footer-tagline {
    font-size: 14.5px;
    margin-bottom: 12px;
}

.footer-note {
    font-size: 13px;
    color: #9db9dd;
}

.footer-links {
    display: flex;
    gap: 48px;
    flex-wrap: wrap;
}

.footer-heading {
    color: var(--white);
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 12px;
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: 9px;
}

.footer-column a {
    color: #cfe0f5;
    font-size: 14.5px;
    transition: color 0.25s var(--ease-smooth), transform 0.25s var(--ease-smooth);
}

.footer-column a:hover {
    color: var(--white);
    transform: translateX(4px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding-top: 18px;
    padding-bottom: 18px;
    font-size: 13.5px;
    color: #9db9dd;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(14px) scale(0.99);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes heroFadeUp {
    from {
        opacity: 0;
        transform: translateY(18px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes progressShine {
    from {
        background-position: 0% 0;
    }
    to {
        background-position: -200% 0;
    }
}

@media (max-width: 900px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .steps-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .main-nav {
        display: none;
    }
    .menu-toggle {
        display: flex;
    }
    .hero h1 {
        font-size: 30px;
    }
    .hero-description {
        font-size: 15.5px;
    }
    .footer-inner {
        flex-direction: column;
    }
    .footer-brand {
        width: 100%;
    }
    .footer-links {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 28px;
        width: 100%;
    }
    .footer-column {
        gap: 8px;
    }
}

@media (max-width: 560px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
    .examples-list {
        grid-template-columns: 1fr;
    }
    .tool-card {
        padding: 16px;
    }
    .action-row {
        flex-direction: column;
    }
    .video-head {
        flex-direction: column;
        align-items: flex-start;
    }
    .video-thumb {
        width: 100%;
        height: auto;
        aspect-ratio: 16 / 9;
    }
    .seo-section {
        padding: 20px;
    }
    .page-content .content-card {
        padding: 20px;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}