/* ===================================
   Google Fonts – Inter
   =================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
    /* Brand */
    --color-primary:       #e31e24;
    --color-primary-dark:  #b91920;
    --color-primary-light: #ff4d52;
    --color-primary-glow:  rgba(227, 30, 36, 0.18);

    /* Backgrounds */
    --color-bg:        #0d0e12;
    --color-surface:   #13151c;
    --color-surface-2: #1a1c25;
    --color-surface-3: #20232e;

    /* Borders */
    --color-border:       #252830;
    --color-border-light: #2e3140;

    /* Text */
    --color-white:        #ffffff;
    --color-text:         #e8e9ed;
    --color-text-muted:   #8b8d9a;
    --color-text-subtle:  #555768;

    /* Semantic */
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-error:   #ef4444;

    /* Icon colour */
    --color-icon: #e31e24;

    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs:   0.75rem;
    --font-size-sm:   0.875rem;
    --font-size-base: 1rem;
    --font-size-lg:   1.125rem;
    --font-size-xl:   1.25rem;
    --font-size-2xl:  1.5rem;
    --font-size-3xl:  1.875rem;
    --font-size-4xl:  2.25rem;
    --font-size-5xl:  3rem;
    --font-size-6xl:  3.75rem;

    /* Spacing */
    --spacing-xs:  0.25rem;
    --spacing-sm:  0.5rem;
    --spacing-md:  1rem;
    --spacing-lg:  1.5rem;
    --spacing-xl:  2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Radii */
    --radius-sm:   0.25rem;
    --radius-md:   0.5rem;
    --radius-lg:   0.75rem;
    --radius-xl:   1rem;
    --radius-2xl:  1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,.5);
    --shadow-md: 0 4px 16px rgba(0,0,0,.6);
    --shadow-lg: 0 10px 32px rgba(0,0,0,.65);
    --shadow-xl: 0 20px 50px rgba(0,0,0,.7);
    --shadow-red: 0 4px 24px rgba(227,30,36,.35);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Layout */
    --container-max: 1200px;
    --header-height: 72px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.65;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img  { max-width: 100%; height: auto; display: block; }
a    { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }
ul, ol { list-style: none; }

/* ===================================
   Layout
   =================================== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section { padding: var(--spacing-4xl) 0; }

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

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-3xl);
}

.section-label {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.section-label::before,
.section-label::after {
    content: '';
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    border-radius: var(--radius-full);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.section-title span { color: var(--color-primary); }

.section-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ===================================
   Header
   =================================== */
.header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-height);
    background-color: rgba(13, 14, 18, .95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: background-color var(--transition-base);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 800;
    font-size: var(--font-size-lg);
    color: var(--color-white);
}

.logo-icon {
    width: 38px;
    height: 38px;
    color: var(--color-primary);
}

.logo-text { color: var(--color-white); }

/* Nav */
.main-nav { display: none; }

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-item { position: relative; }

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-muted);
    font-weight: 500;
    font-size: var(--font-size-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-link:hover, .nav-link:focus {
    background-color: var(--color-surface-2);
    color: var(--color-white);
}

.dropdown-arrow {
    width: 12px; height: 12px;
    transition: transform var(--transition-fast);
}

.dropdown-toggle[aria-expanded="true"] .dropdown-arrow {
    transform: rotate(180deg);
}

/* Dropdown */
.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 220px;
    background-color: var(--color-surface-2);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--transition-fast), visibility var(--transition-fast), transform var(--transition-fast);
}

.nav-item.has-dropdown:hover .dropdown-menu,
.nav-item.has-dropdown:focus-within .dropdown-menu,
.dropdown-toggle[aria-expanded="true"] + .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.dropdown-link:hover, .dropdown-link:focus {
    background-color: var(--color-surface-3);
    color: var(--color-white);
}

/* Mobile toggle */
.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px; height: 40px;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.mobile-menu-toggle:hover { background-color: var(--color-surface-2); }

.hamburger-line {
    width: 100%; height: 2px;
    background-color: var(--color-text-muted);
    border-radius: var(--radius-full);
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
}
.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ===================================
   Hero
   =================================== */
.hero {
    padding-top: calc(var(--header-height) + var(--spacing-4xl));
    padding-bottom: var(--spacing-4xl);
    background: var(--color-bg);
    position: relative;
    overflow: hidden;
}

/* subtle red glow backdrop */
.hero::before {
    content: '';
    position: absolute;
    top: -120px; left: 50%;
    transform: translateX(-50%);
    width: 900px; height: 600px;
    background: radial-gradient(ellipse at center, rgba(227,30,36,.12) 0%, transparent 70%);
    pointer-events: none;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    position: relative;
}

.hero-content { text-align: center; }

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 6px var(--spacing-md);
    background-color: var(--color-primary-glow);
    border: 1px solid rgba(227,30,36,.35);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xl);
    letter-spacing: .02em;
}

.hero-badge-dot {
    width: 7px; height: 7px;
    background: var(--color-primary);
    border-radius: var(--radius-full);
    animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%       { opacity: .5; transform: scale(.75); }
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 900;
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
    line-height: 1.15;
    letter-spacing: -.02em;
}

.hero-title span { color: var(--color-primary); }

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.75;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

.hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
    justify-content: center;
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.hero-stat-value {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
}

.hero-stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: 4px;
}

.hero-visual { display: flex; justify-content: center; }

.hero-illustration { width: 100%; max-width: 480px; height: auto; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 14px var(--spacing-xl);
    font-weight: 700;
    font-size: var(--font-size-base);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    letter-spacing: .01em;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-red);
}

.btn-primary:hover, .btn-primary:focus {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(227,30,36,.45);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-white);
    border: 2px solid var(--color-border-light);
}

.btn-secondary:hover, .btn-secondary:focus {
    background-color: var(--color-surface-2);
    border-color: var(--color-text-subtle);
    transform: translateY(-2px);
}

/* ===================================
   Features Grid
   =================================== */
.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

.feature-card {
    background-color: var(--color-surface-2);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(227,30,36,.4);
    box-shadow: 0 8px 32px rgba(0,0,0,.4), 0 0 0 1px rgba(227,30,36,.15);
}

.feature-icon {
    width: 52px; height: 52px;
    margin-bottom: var(--spacing-lg);
    color: var(--color-icon);
    background: var(--color-primary-glow);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
}

.feature-icon svg { width: 100%; height: 100%; }

.feature-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.feature-description { color: var(--color-text-muted); font-size: var(--font-size-sm); line-height: 1.7; }

/* ===================================
   Steps Section
   =================================== */
.steps-list {
    max-width: 820px;
    margin: 0 auto;
}

.step-item {
    display: flex;
    gap: var(--spacing-xl);
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--color-border);
    transition: opacity var(--transition-fast);
}

.step-item:last-child { border-bottom: none; }

.step-number {
    flex-shrink: 0;
    width: 48px; height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary);
    color: var(--color-white);
    font-size: var(--font-size-xl);
    font-weight: 800;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-red);
}

.step-content { flex: 1; }

.step-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.step-description { color: var(--color-text-muted); font-size: var(--font-size-sm); line-height: 1.75; }

/* ===================================
   Info Cards
   =================================== */
.info-cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

.info-card {
    background-color: var(--color-surface-2);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: transform var(--transition-base), border-color var(--transition-base);
}

.info-card:hover {
    transform: translateY(-3px);
    border-color: rgba(227,30,36,.35);
}

.info-icon {
    width: 48px; height: 48px;
    margin-bottom: var(--spacing-lg);
    color: var(--color-icon);
    background: var(--color-primary-glow);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 11px;
}

.info-icon svg { width: 100%; height: 100%; }

.info-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.info-description { color: var(--color-text-muted); font-size: var(--font-size-sm); line-height: 1.75; }

/* ===================================
   Category Cards (homepage)
   =================================== */
.category-card { display: flex; flex-direction: column; }

.category-links {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.category-links li { display: flex; }

.category-links a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 6px 0;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast), padding var(--transition-fast);
    width: 100%;
}

.category-links a::before {
    content: '→';
    color: var(--color-primary);
    font-weight: 700;
    transition: transform var(--transition-fast);
}

.category-links a:hover {
    color: var(--color-white);
    padding-left: 4px;
}

.category-links a:hover::before { transform: translateX(2px); }

.category-card--cta {
    background: linear-gradient(135deg, rgba(227,30,36,.08), rgba(227,30,36,.02));
    border-color: rgba(227,30,36,.3);
    align-items: flex-start;
}

.category-card--cta .info-icon {
    background: var(--color-primary);
    color: var(--color-white);
}

.category-cta-btn { margin-top: auto; align-self: stretch; }

@media (min-width: 1024px) {
    .info-cards--3col { grid-template-columns: repeat(3, 1fr); }
}

/* ===================================
   Closing card
   =================================== */
.closing-card {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--color-surface-2), var(--color-surface-3));
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    margin-bottom: var(--spacing-2xl);
    position: relative;
    overflow: hidden;
}

.closing-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 4px;
    height: 100%;
    background: var(--color-primary);
}

.closing-title {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
    line-height: 1.25;
}

.closing-text { color: var(--color-text-muted); font-size: var(--font-size-base); line-height: 1.7; }

.closing-cta { display: flex; justify-content: flex-start; }

@media (min-width: 768px) {
    .closing-card { grid-template-columns: 2fr 1fr; gap: var(--spacing-2xl); padding: var(--spacing-3xl); }
    .closing-cta { justify-content: flex-end; }
}

/* ===================================
   Data Grid
   =================================== */
.data-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

.data-category {
    background-color: var(--color-surface-2);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
}

.data-category-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.data-icon { width: 20px; height: 20px; color: var(--color-icon); flex-shrink: 0; }

.data-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.data-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.data-list li::before {
    content: '';
    width: 5px; height: 5px;
    background-color: var(--color-primary);
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

/* ===================================
   Tips Grid
   =================================== */
.tips-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

.tip-card {
    position: relative;
    background-color: var(--color-surface-2);
    padding: var(--spacing-xl);
    padding-top: var(--spacing-3xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: transform var(--transition-base), border-color var(--transition-base);
}

.tip-card:hover {
    transform: translateY(-3px);
    border-color: rgba(227,30,36,.35);
}

.tip-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--color-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

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

.tip-number {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-lg);
    font-size: var(--font-size-4xl);
    font-weight: 900;
    color: var(--color-border-light);
    line-height: 1;
    letter-spacing: -.03em;
}

.tip-title {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.tip-description { color: var(--color-text-muted); font-size: var(--font-size-sm); line-height: 1.75; }

/* ===================================
   Video Section
   =================================== */
.video-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    max-width: 1000px;
    margin: 0 auto;
}

.video-thumbnail-link { display: block; text-decoration: none; }

.video-thumbnail {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background-color: var(--color-surface-3);
    aspect-ratio: 16 / 9;
    border: 1px solid var(--color-border);
}

.video-thumbnail img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform var(--transition-base), filter var(--transition-base);
}

.video-thumbnail-link:hover .video-thumbnail img {
    transform: scale(1.04);
    filter: brightness(.75);
}

.video-play-button {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 68px; height: 48px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.video-play-button svg { width: 100%; height: 100%; }
.video-play-button .play-bg { transition: fill var(--transition-fast); }

.video-thumbnail-link:hover .video-play-button { transform: translate(-50%, -50%) scale(1.12); }
.video-thumbnail-link:hover .video-play-button .play-bg { fill: #cc0000; }

.video-external-hint {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: rgba(0,0,0,.8);
    color: var(--color-white);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-full);
    opacity: 0;
    white-space: nowrap;
    transition: opacity var(--transition-fast);
}

.video-thumbnail-link:hover .video-external-hint { opacity: 1; }

.video-description {
    background-color: var(--color-surface-2);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
}

.video-description h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.video-description ul { display: flex; flex-direction: column; gap: var(--spacing-sm); margin-bottom: var(--spacing-lg); }

.video-description li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.video-description li::before {
    content: '';
    width: 7px; height: 7px;
    background-color: var(--color-primary);
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.video-btn { display: inline-flex; width: 100%; justify-content: center; }
.video-btn .btn-icon { width: 20px; height: 20px; }

/* ===================================
   FAQ
   =================================== */
.faq-list { max-width: 820px; margin: 0 auto; }

.faq-item {
    background-color: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.faq-item.active { border-color: rgba(227,30,36,.4); }

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--spacing-lg);
    text-align: left;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-white);
    transition: background-color var(--transition-fast);
}

.faq-question:hover { background-color: var(--color-surface-3); }

.faq-question span { flex: 1; padding-right: var(--spacing-md); }

.faq-icon {
    width: 22px; height: 22px;
    color: var(--color-primary);
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.faq-question[aria-expanded="true"] .faq-icon { transform: rotate(180deg); }

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.faq-answer p {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    line-height: 1.8;
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-md);
}

.faq-item.active .faq-answer { max-height: 500px; }

/* ===================================
   Data Notice
   =================================== */
.data-notice {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-lg);
    background-color: var(--color-surface-2);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-primary);
}

.notice-icon { width: 22px; height: 22px; color: var(--color-primary); flex-shrink: 0; margin-top: 2px; }

.data-notice p { color: var(--color-text-muted); font-size: var(--font-size-sm); line-height: 1.7; }
.data-notice strong { color: var(--color-white); }

/* ===================================
   Contact
   =================================== */
.contact-info {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.contact-card {
    text-align: center;
    padding: var(--spacing-xl);
    background-color: var(--color-surface-2);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    min-width: 260px;
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.contact-card:hover {
    transform: translateY(-4px);
    border-color: rgba(227,30,36,.35);
}

.contact-icon {
    width: 52px; height: 52px;
    margin: 0 auto var(--spacing-md);
    color: var(--color-icon);
    background: var(--color-primary-glow);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
}

.contact-icon svg { width: 100%; height: 100%; }

.contact-title {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.contact-detail { color: var(--color-text-muted); font-size: var(--font-size-sm); }
.contact-link { display: inline-block; transition: color var(--transition-fast); }
.contact-link:hover { color: var(--color-primary); }

.disclaimer {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    background-color: var(--color-surface-2);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    text-align: center;
}

.disclaimer p { color: var(--color-text-subtle); font-size: var(--font-size-sm); }

/* ===================================
   kW-LE Converter
   =================================== */
.converter-card {
    max-width: 700px;
    margin: 0 auto var(--spacing-3xl);
    background-color: var(--color-surface-2);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
}

.converter-info {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.converter-info p { color: var(--color-text-muted); font-size: var(--font-size-sm); }
.converter-info strong { color: var(--color-white); }

.converter-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-lg);
    align-items: end;
    margin-bottom: var(--spacing-lg);
}

.converter-field { display: flex; flex-direction: column; gap: var(--spacing-sm); }

.converter-label { font-size: var(--font-size-sm); font-weight: 600; color: var(--color-text-muted); }

.converter-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-white);
    background-color: var(--color-surface-3);
    border: 2px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    font-family: var(--font-family);
    -moz-appearance: textfield;
}

.converter-input::-webkit-outer-spin-button,
.converter-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

.converter-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
    background-color: var(--color-surface-3);
}

.converter-input::placeholder { color: var(--color-text-subtle); font-weight: 400; }

.converter-arrow { display: flex; align-items: center; justify-content: center; padding-bottom: var(--spacing-xs); }

.swap-button {
    width: 44px; height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-full);
    transition: background-color var(--transition-fast), transform var(--transition-fast);
    box-shadow: var(--shadow-red);
}

.swap-button svg { width: 22px; height: 22px; }
.swap-button:hover { background-color: var(--color-primary-dark); transform: scale(1.1); }

.converter-result {
    text-align: center;
    padding: var(--spacing-md);
    background-color: var(--color-surface-3);
    border-radius: var(--radius-lg);
    min-height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
}

.converter-result p { font-size: var(--font-size-base); color: var(--color-text-muted); }
.converter-result strong { color: var(--color-primary); font-size: var(--font-size-xl); }

.converter-examples {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.converter-examples > p { font-size: var(--font-size-sm); color: var(--color-text-subtle); margin-bottom: var(--spacing-md); }

.example-chips { display: flex; flex-wrap: wrap; gap: var(--spacing-sm); justify-content: center; }

.example-chip {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-muted);
    background-color: var(--color-surface-3);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.example-chip:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

/* Conversion Table */
.table-section { max-width: 900px; margin: 0 auto; }

.table-title {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--color-white);
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.table-description { text-align: center; color: var(--color-text-muted); font-size: var(--font-size-sm); margin-bottom: var(--spacing-2xl); }

.table-responsive {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.conversion-table { width: 100%; border-collapse: collapse; background-color: var(--color-surface-2); }

.conversion-table thead { background-color: var(--color-primary); }

.conversion-table th {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: center;
    font-weight: 700;
    font-size: var(--font-size-sm);
    color: var(--color-white);
    text-transform: uppercase;
    letter-spacing: .05em;
}

.conversion-table th.table-separator { width: 2px; padding: 0; background-color: rgba(255,255,255,.2); }

.conversion-table td {
    padding: var(--spacing-sm) var(--spacing-lg);
    text-align: center;
    font-size: var(--font-size-sm);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-muted);
}

.conversion-table td.table-separator { width: 2px; padding: 0; background-color: var(--color-border); }

.conversion-table tbody tr:hover { background-color: var(--color-surface-3); }
.conversion-table tbody tr:last-child td { border-bottom: none; }
.conversion-table td.kw-cell { font-weight: 700; color: var(--color-white); }

/* ===================================
   Sources Grid (unused but kept)
   =================================== */
.sources-grid { display: grid; grid-template-columns: 1fr; gap: var(--spacing-xl); }

.source-card {
    background-color: var(--color-surface-2);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: transform var(--transition-base), border-color var(--transition-base);
}

.source-card:hover { transform: translateY(-4px); border-color: rgba(227,30,36,.35); }

.source-icon { width: 52px; height: 52px; margin-bottom: var(--spacing-lg); color: var(--color-icon); }
.source-icon svg { width: 100%; height: 100%; }
.source-title { font-size: var(--font-size-xl); font-weight: 700; color: var(--color-white); margin-bottom: var(--spacing-sm); }
.source-description { color: var(--color-text-muted); margin-bottom: var(--spacing-lg); font-size: var(--font-size-sm); }
.source-features { display: flex; flex-wrap: wrap; gap: var(--spacing-sm); }

.source-feature {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--color-surface-3);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
}

/* ===================================
   Footer
   =================================== */
.footer {
    background-color: #09090d;
    color: var(--color-text-muted);
    padding: var(--spacing-4xl) 0 var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-white);
    font-weight: 800;
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
}

.footer-logo .logo-icon { color: var(--color-primary); }

.footer-description { color: var(--color-text-subtle); font-size: var(--font-size-sm); line-height: 1.7; }

.footer-nav { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--spacing-xl); }

.footer-nav-title {
    color: var(--color-white);
    font-size: var(--font-size-sm);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: .08em;
}

.footer-nav-list { display: flex; flex-direction: column; gap: var(--spacing-sm); }

.footer-nav-list a {
    color: var(--color-text-subtle);
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

.footer-nav-list a:hover { color: var(--color-white); }

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.copyright { color: var(--color-text-subtle); font-size: var(--font-size-sm); margin-bottom: var(--spacing-sm); }
.footer-note { color: var(--color-text-subtle); font-size: var(--font-size-xs); opacity: .7; }

.footer-legal { margin-top: var(--spacing-sm); font-size: var(--font-size-xs); }
.footer-legal a { color: var(--color-text-subtle); transition: color .2s; }
.footer-legal a:hover { color: var(--color-white); }

/* ===================================
   Page / Article styles (sub-pages)
   =================================== */
.page-hero {
    padding-top: calc(var(--header-height) + var(--spacing-3xl));
    padding-bottom: var(--spacing-3xl);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.page-content { padding: var(--spacing-4xl) 0; }

.page-content h2 {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-2xl);
}

.page-content h2:first-child { margin-top: 0; }

.page-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-xl);
}

.page-content p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.page-content ul, .page-content ol {
    list-style: disc;
    padding-left: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-muted);
}

.page-content ol { list-style: decimal; }
.page-content li { margin-bottom: var(--spacing-sm); line-height: 1.7; }

.page-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-xl);
    font-size: var(--font-size-sm);
}

.page-content table th {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    font-weight: 700;
}

.page-content table td {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-muted);
}

.page-content table tr:hover td { background-color: var(--color-surface-2); }

.info-box {
    background-color: rgba(227,30,36,.08);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.info-box p { margin-bottom: 0; color: var(--color-text-muted); }

.warning-box {
    background-color: rgba(245,158,11,.08);
    border-left: 4px solid var(--color-warning);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.warning-box p { margin-bottom: 0; color: var(--color-text-muted); }

.page-image-wrapper { text-align: center; margin-bottom: var(--spacing-2xl); }

.page-image {
    width: 100%; max-width: 820px; height: auto;
    margin: 0 auto; display: block;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}

.page-image-caption { font-size: var(--font-size-sm); color: var(--color-text-subtle); margin-top: var(--spacing-sm); font-style: italic; }

/* ===================================
   Mega Dropdown
   =================================== */
.dropdown-menu--mega {
    min-width: 300px;
    max-height: 80vh;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--color-border-light) transparent;
}

.dropdown-menu--mega::-webkit-scrollbar { width: 4px; }
.dropdown-menu--mega::-webkit-scrollbar-track { background: transparent; }
.dropdown-menu--mega::-webkit-scrollbar-thumb { background-color: var(--color-border-light); border-radius: var(--radius-full); }

.dropdown-section-title {
    display: block;
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .12em;
    color: var(--color-primary);
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-xs);
    pointer-events: none;
    cursor: default;
}

.dropdown-divider {
    height: 1px;
    background-color: var(--color-border);
    margin: var(--spacing-xs) var(--spacing-md);
    list-style: none;
}

/* ===================================
   Responsive
   =================================== */

/* Tablet */
@media (min-width: 640px) {
    .features-grid   { grid-template-columns: repeat(2, 1fr); }
    .info-cards      { grid-template-columns: repeat(2, 1fr); }
    .data-grid       { grid-template-columns: repeat(2, 1fr); }
    .sources-grid    { grid-template-columns: repeat(2, 1fr); }
    .tips-grid       { grid-template-columns: repeat(2, 1fr); }
}

/* Desktop */
@media (min-width: 1024px) {
    .mobile-menu-toggle { display: none; }
    .main-nav { display: block; }

    .hero .container     { grid-template-columns: 1fr 1fr; }
    .hero-content        { text-align: left; }
    .hero-title          { font-size: var(--font-size-5xl); }
    .hero-subtitle       { margin-left: 0; margin-right: 0; }
    .hero-cta            { justify-content: flex-start; }
    .hero-stats          { justify-content: flex-start; }

    .features-grid  { grid-template-columns: repeat(4, 1fr); }
    .info-cards     { grid-template-columns: repeat(3, 1fr); }
    .data-grid      { grid-template-columns: repeat(4, 1fr); }
    .sources-grid   { grid-template-columns: repeat(3, 1fr); }
    .tips-grid      { grid-template-columns: repeat(4, 1fr); }

    .footer-content { grid-template-columns: 1fr 2fr; }
    .footer-nav     { grid-template-columns: repeat(3, 1fr); justify-items: end; }

    .video-container { grid-template-columns: 2fr 1fr; align-items: start; }
}

/* Large Desktop */
@media (min-width: 1280px) {
    .section-title { font-size: var(--font-size-4xl); }
}

/* Mobile menu */
@media (max-width: 1023px) {
    .main-nav {
        position: absolute;
        top: var(--header-height);
        left: 0; right: 0;
        background-color: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-lg);
        display: none;
    }

    .main-nav.active { display: block; }

    .nav-list { flex-direction: column; align-items: stretch; gap: var(--spacing-sm); }

    .dropdown-menu {
        position: static;
        opacity: 1; visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        padding-left: var(--spacing-xl);
        display: none;
        background-color: transparent;
    }

    .dropdown-toggle[aria-expanded="true"] + .dropdown-menu { display: block; }
}

/* Converter mobile */
@media (max-width: 500px) {
    .converter-grid { grid-template-columns: 1fr; gap: var(--spacing-md); }
    .converter-arrow { transform: rotate(90deg); padding: 0; }
    .converter-card { padding: var(--spacing-lg); }
}

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

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Print */
@media print {
    .header, .hero-cta, .footer, .video-container { display: none; }
    .section { padding: var(--spacing-lg) 0; }
    body { font-size: 12pt; background: #fff; color: #000; }
}