/* ===================================
   Elbtunnel StauAgent V2 - Conversion Optimized
   Premium Design with Inline Subscription
   =================================== */

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

:root {
    /* Colors - Light Mode (Premium Palette) */
    --color-bg: #FFFFFF;
    --color-bg-secondary: #F8FAFB;
    --color-bg-tertiary: #EEF2F5;
    --color-text: #1A1D1F;
    --color-text-secondary: #6B7280;
    --color-text-muted: #9CA3AF;

    /* Brand Colors */
    --color-primary: #0F766E;
    --color-primary-hover: #0D6560;
    --color-primary-light: rgba(15, 118, 110, 0.1);

    /* CTA Colors - High Contrast for Conversion */
    --color-cta: #2563EB;
    --color-cta-hover: #1D4ED8;
    --color-cta-active: #1E40AF;
    --color-cta-light: rgba(37, 99, 235, 0.1);

    /* Feedback Colors */
    --color-success: #059669;
    --color-success-bg: #D1FAE5;
    --color-error: #DC2626;
    --color-error-bg: #FEE2E2;
    --color-warning: #D97706;

    /* Borders & Shadows */
    --color-border: #E5E7EB;
    --color-border-focus: var(--color-cta);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Typography */
    --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, 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;

    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* Body */
html {
    scroll-behavior: smooth;
    max-width: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font-system);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    max-width: 100%;
    overflow-x: hidden;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: #fff;
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    z-index: 1000;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

/* Screen Reader Only */
.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;
}

/* ===================================
   SITE HEADER WITH BRANDING
   =================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-4) var(--spacing-6);
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.brand-name {
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: #fff;
    letter-spacing: 0;
}

.brand-separator {
    color: rgba(255, 255, 255, 0.3);
    font-weight: 300;
    font-size: var(--font-size-lg);
}

.brand-tagline {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
    font-weight: 400;
    text-transform: lowercase;
}

.brand-logo-link {
    display: inline-flex;
    align-items: center;
    transition: all var(--transition-fast);
    margin-left: var(--spacing-1);
}

.brand-logo-link:hover {
    opacity: 0.85;
    transform: scale(1.02);
}

.brand-logo {
    height: 32px;
    width: auto;
}

/* Language Switcher in Header */
.site-header .lang-switcher {
    position: static;
    margin-left: auto;
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.9);
    border-radius: var(--radius-md);
}

.site-header .lang-switcher:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    color: #fff;
}

/* Container */
.container {
    width: 100%;
    max-width: 100%;
}

/* ===================================
   HERO SECTION - Above the Fold
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-6);
    padding-top: calc(72px + var(--spacing-6)); /* Account for larger fixed header */
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(15, 23, 42, 0.92) 0%,
        rgba(15, 23, 42, 0.85) 50%,
        rgba(15, 23, 42, 0.75) 100%
    );
}

.hero-content {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 620px;
    min-width: 0;
    text-align: center;
}

/* Trust Badge */
.trust-badge {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-4);
    width: 100%;
    max-width: 440px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
    padding: var(--spacing-3) var(--spacing-3) var(--spacing-3) var(--spacing-4);
    margin: 0 auto var(--spacing-6);
    text-align: left;
    box-shadow: 0 14px 36px rgba(0, 0, 0, 0.16);
}

.badge-copy {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
    gap: 2px;
}

.badge-copy span {
    display: block;
}

.badge-primary {
    font-size: var(--font-size-sm);
    font-weight: 700;
    line-height: 1.25;
    color: #fff;
}

.badge-secondary {
    font-size: var(--font-size-xs);
    line-height: 1.35;
    color: rgba(255, 255, 255, 0.78);
}

.badge-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    background: var(--color-success);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 24px rgba(5, 150, 105, 0.28);
    flex-shrink: 0;
    font-size: 1.4rem;
    font-weight: 800;
    color: #fff;
}

/* Hero Typography */
.hero h1 {
    font-size: clamp(var(--font-size-2xl), 6vw, var(--font-size-4xl));
    font-weight: 800;
    line-height: 1.1;
    color: #fff;
    margin-bottom: var(--spacing-4);
    letter-spacing: 0;
}

.hero h1 .highlight {
    color: #FCD34D;
    position: relative;
}

.hero-subtitle {
    font-size: clamp(var(--font-size-base), 2.5vw, var(--font-size-lg));
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-6);
    line-height: 1.5;
}

/* ===================================
   SUBSCRIPTION FORM - Conversion Engine
   =================================== */
.subscribe-form {
    background: #fff;
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-xl);
}

.form-row {
    display: flex;
    align-items: stretch;
    flex-direction: column;
    gap: var(--spacing-3);
}

.form-group {
    flex: 1;
    position: relative;
    width: 100%;
}

.form-group input {
    width: 100%;
    padding: var(--spacing-4) var(--spacing-4);
    font-size: var(--font-size-base);
    font-family: var(--font-system);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg);
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-cta);
    box-shadow: 0 0 0 3px var(--color-cta-light);
}

.form-group input.error {
    border-color: var(--color-error);
    background: var(--color-error-bg);
}

.form-group input::placeholder {
    color: var(--color-text-muted);
}

.error-message {
    display: block;
    position: static;
    margin-top: var(--spacing-1);
    font-size: var(--font-size-xs);
    color: var(--color-error);
    line-height: 1.35;
}

.error-message:empty {
    display: none;
}

.field-hint {
    display: block;
    margin-top: var(--spacing-1);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* Submit Button */
.submit-btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4) var(--spacing-6);
    font-size: var(--font-size-base);
    font-weight: 600;
    font-family: var(--font-system);
    color: #fff;
    background: var(--color-cta);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    width: 100%;
    min-width: 240px;
}

.submit-btn:hover:not(:disabled) {
    background: var(--color-cta-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.submit-btn:active:not(:disabled) {
    background: var(--color-cta-active);
    transform: translateY(0);
}

.submit-btn:disabled {
    cursor: not-allowed;
    opacity: 0.8;
}

.btn-text,
.btn-loading,
.btn-success {
    transition: all var(--transition-fast);
}

.btn-loading,
.btn-success {
    position: absolute;
    opacity: 0;
    transform: scale(0.8);
}

.submit-btn.loading .btn-text {
    opacity: 0;
}

.submit-btn.loading .btn-loading {
    opacity: 1;
    transform: scale(1);
}

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

.submit-btn.success .btn-text,
.submit-btn.success .btn-loading {
    opacity: 0;
}

.submit-btn.success .btn-success {
    opacity: 1;
    transform: scale(1);
    font-size: var(--font-size-xl);
}

/* Spinner Animation */
.spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Phone Toggle */
.phone-toggle {
    margin-top: var(--spacing-4);
    text-align: center;
}

.toggle-btn {
    display: inline-flex;
    align-items: center;
    padding: 0;
    font-size: var(--font-size-sm);
    font-family: var(--font-system);
    color: var(--color-cta);
    background: none;
    border: none;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.toggle-btn:hover {
    color: var(--color-cta-hover);
    text-decoration: underline;
}

.sms-toggle-btn {
    justify-content: center;
    gap: var(--spacing-2);
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    border: 1px solid rgba(37, 99, 235, 0.22);
    border-radius: var(--radius-lg);
    background: var(--color-cta-light);
    color: var(--color-cta-hover);
    font-weight: 700;
}

.sms-toggle-btn:hover {
    background: rgba(37, 99, 235, 0.14);
    border-color: rgba(37, 99, 235, 0.34);
    color: var(--color-cta-active);
    text-decoration: none;
}

.toggle-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #fff;
    font-weight: 800;
}

.phone-group {
    margin-top: var(--spacing-3);
}

.form-robot-cue {
    display: none;
    justify-content: center;
    margin: 0.72rem 0 0.35rem;
    pointer-events: none;
}

.form-robot-cue img {
    display: block;
    width: 42px;
    height: auto;
    filter: drop-shadow(0 8px 12px rgba(15, 23, 42, 0.12));
}

/* Privacy Note */
.privacy-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    flex-wrap: wrap;
    margin-top: var(--spacing-3);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.45;
}

.lock-icon {
    flex-shrink: 0;
}

.privacy-note-secondary {
    margin-top: var(--spacing-1);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.alert-example {
    margin-top: var(--spacing-4);
    padding: var(--spacing-4);
    border: 1px solid rgba(15, 118, 110, 0.18);
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, rgba(15, 118, 110, 0.08), rgba(15, 118, 110, 0.03));
    text-align: left;
}

.alert-example-label {
    margin-bottom: var(--spacing-2);
    color: var(--color-primary);
    font-size: var(--font-size-xs);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0;
}

.alert-example-text {
    margin: 0;
    color: var(--color-text);
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

.hero-secondary-action {
    margin-top: var(--spacing-4);
    padding-top: var(--spacing-3);
    border-top: 1px solid rgba(15, 23, 42, 0.08);
    text-align: center;
}

.secondary-action-label {
    margin-bottom: var(--spacing-2);
    font-size: var(--font-size-xs);
    font-weight: 600;
    letter-spacing: 0;
    color: var(--color-text-secondary);
}

.secondary-feed-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-3);
    border: 1px solid rgba(37, 99, 235, 0.12);
    border-radius: var(--radius-full);
    background: transparent;
    color: var(--color-cta);
    font-size: var(--font-size-xs);
    font-weight: 650;
    text-decoration: none;
    transition: transform var(--transition-fast),
                box-shadow var(--transition-fast),
                border-color var(--transition-fast),
                background var(--transition-fast),
                color var(--transition-fast);
}

.secondary-feed-link:hover {
    transform: translateY(-1px);
    border-color: rgba(37, 99, 235, 0.24);
    background: rgba(37, 99, 235, 0.06);
    box-shadow: none;
    color: var(--color-cta-hover);
}

.secondary-feed-link-arrow {
    font-size: 1rem;
    transition: transform var(--transition-fast);
}

.secondary-feed-link:hover .secondary-feed-link-arrow {
    transform: translateX(2px);
}

/* ===================================
   SUCCESS MESSAGE
   =================================== */
.success-message {
    text-align: center;
    padding: var(--spacing-8);
    background: #fff;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.success-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: var(--color-success-bg);
    color: var(--color-success);
    border-radius: 50%;
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-4);
}

.success-message h2 {
    font-size: var(--font-size-xl);
    color: var(--color-text);
    margin-bottom: var(--spacing-2);
}

.success-message p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-4);
}

.success-tip {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-4);
    font-size: var(--font-size-sm);
}

.email-highlight {
    display: inline-block;
    background: var(--color-primary-light);
    color: var(--color-primary);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.vcf-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    margin-top: var(--spacing-4);
    padding: var(--spacing-3) var(--spacing-5);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-light);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.vcf-btn:hover {
    background: var(--color-primary);
    color: #fff;
}

/* ===================================
   FEATURES SECTION
   =================================== */
.features {
    padding: var(--spacing-12) var(--spacing-6);
    background: var(--color-bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-6);
    max-width: 1000px;
    margin: 0 auto;
}

.feature {
    text-align: center;
    padding: var(--spacing-6);
    background: #fff;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base);
}

.feature:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

/* Override hover transform when animating */
.feature.animate-on-scroll:not(.is-visible):hover {
    transform: translateY(50px);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-4);
}

.feature h3 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-2);
}

.feature p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* ===================================
   SOURCE METHOD SECTION
   =================================== */
.source-method {
    padding: var(--spacing-12) var(--spacing-6);
    background: #fff;
}

.source-method-inner {
    max-width: 1000px;
    margin: 0 auto;
}

.section-eyebrow {
    margin-bottom: var(--spacing-2);
    color: var(--color-primary);
    font-size: var(--font-size-xs);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0;
    text-align: center;
}

.source-method h2 {
    margin-bottom: var(--spacing-4);
    color: var(--color-text);
    font-size: var(--font-size-2xl);
    line-height: 1.2;
    text-align: center;
}

.source-lead {
    max-width: 760px;
    margin: 0 auto var(--spacing-6);
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    line-height: 1.65;
    text-align: center;
}

.source-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-4);
}

.source-card {
    padding: var(--spacing-5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg-secondary);
}

.source-card h3 {
    margin-bottom: var(--spacing-2);
    color: var(--color-text);
    font-size: var(--font-size-base);
}

.source-card p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.55;
}

/* ===================================
   SEARCH INTENT ANSWERS
   =================================== */
.search-intent {
    padding: var(--spacing-12) var(--spacing-6);
    background: var(--color-bg-secondary);
}

.search-intent-inner {
    max-width: 1000px;
    margin: 0 auto;
}

.search-intent h2 {
    margin-bottom: var(--spacing-4);
    color: var(--color-text);
    font-size: var(--font-size-2xl);
    line-height: 1.2;
    text-align: center;
}

.search-intent-lead {
    max-width: 760px;
    margin: 0 auto var(--spacing-6);
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    line-height: 1.65;
    text-align: center;
}

.intent-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-4);
}

.intent-card {
    padding: var(--spacing-5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: #fff;
    box-shadow: var(--shadow-sm);
}

.intent-card h3 {
    margin-bottom: var(--spacing-2);
    color: var(--color-text);
    font-size: var(--font-size-base);
    line-height: 1.3;
}

.intent-card p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.55;
}

.intent-card a {
    display: inline-flex;
    margin-top: var(--spacing-4);
    color: var(--color-cta);
    font-size: var(--font-size-sm);
    font-weight: 800;
    text-decoration: none;
}

.intent-card a:hover {
    text-decoration: underline;
}

.intent-card-cta {
    border-color: rgba(37, 99, 235, 0.25);
    background: var(--color-cta-light);
}

/* ===================================
   HOW IT WORKS SECTION
   =================================== */
.how-it-works {
    padding: var(--spacing-12) var(--spacing-6);
    max-width: 800px;
    margin: 0 auto;
}

.how-it-works h2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-8);
    color: var(--color-text);
}

.steps {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.steps li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-4);
    padding: var(--spacing-5);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
}

.step-num {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--color-cta);
    color: #fff;
    border-radius: 50%;
    font-weight: 700;
    flex-shrink: 0;
}

.steps strong {
    display: block;
    font-size: var(--font-size-base);
    color: var(--color-text);
    margin-bottom: var(--spacing-1);
}

.steps p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
}

/* ===================================
   FAQ SECTION
   =================================== */
.faq {
    padding: var(--spacing-12) var(--spacing-6);
    background: var(--color-bg-secondary);
}

.faq h2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-8);
    color: var(--color-text);
}

.faq-item {
    max-width: 700px;
    margin: 0 auto var(--spacing-3);
    background: #fff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.faq-item summary {
    padding: var(--spacing-4) var(--spacing-5);
    font-weight: 600;
    color: var(--color-text);
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background var(--transition-fast);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: var(--font-size-xl);
    font-weight: 400;
    color: var(--color-text-muted);
    transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item summary:hover {
    background: var(--color-bg-secondary);
}

.faq-item p {
    padding: 0 var(--spacing-5) var(--spacing-5);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===================================
   FOOTER
   =================================== */
.footer {
    padding: var(--spacing-8) var(--spacing-6);
    background: var(--color-text);
    color: rgba(255, 255, 255, 0.8);
}

.footer-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.footer-brand {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: #fff;
    margin-bottom: var(--spacing-2);
}

.footer-desc {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-2);
}

.footer-sources {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-4);
}

.footer-sources a {
    color: var(--color-primary);
    color: #71D0CE;
    text-decoration: none;
}

.footer-sources a:hover {
    text-decoration: underline;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-4);
    flex-wrap: wrap;
}

.footer-links a {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: #fff;
}

/* ===================================
   CHECKBOX STYLES
   =================================== */
.checkbox-group {
    margin-top: var(--spacing-3);
    text-align: left;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-2);
    cursor: pointer;
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    line-height: 1.4;
}

.checkbox-label input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.checkbox-custom {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    margin-top: 2px;
}

.checkbox-custom::after {
    content: '';
    width: 8px;
    height: 5px;
    border-left: 2px solid #fff;
    border-bottom: 2px solid #fff;
    transform: rotate(-45deg) scale(0);
    transition: transform var(--transition-fast);
    margin-bottom: 2px;
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom {
    background: var(--color-cta);
    border-color: var(--color-cta);
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom::after {
    transform: rotate(-45deg) scale(1);
}

.checkbox-label input[type="checkbox"]:focus-visible + .checkbox-custom {
    outline: 3px solid var(--color-cta-light);
    outline-offset: 2px;
}

.checkbox-label input[type="checkbox"].error + .checkbox-custom {
    border-color: var(--color-error);
}

.checkbox-text {
    flex: 1;
}

.checkbox-text a {
    color: var(--color-cta);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.checkbox-text a:hover {
    color: var(--color-cta-hover);
}

.checkbox-group .error-message {
    margin-left: 24px;
    margin-top: var(--spacing-2);
}

/* ===================================
   FOOTER STAUAGENT BRANDING
   =================================== */
.footer-brand-section {
    margin-bottom: var(--spacing-6);
}

.stauagent-logo-link {
    display: inline-block;
    transition: opacity var(--transition-fast);
}

.stauagent-logo-link:hover {
    opacity: 0.8;
}

.stauagent-logo {
    width: clamp(104px, 16vw, 128px);
    max-width: 128px;
    height: auto;
    margin-bottom: var(--spacing-3);
}

.footer-agent-text {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    margin: 0;
}

.footer-agent-text a {
    color: #71D0CE;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.footer-agent-text a:hover {
    text-decoration: underline;
}

.footer-divider {
    width: 60px;
    height: 1px;
    background: rgba(255, 255, 255, 0.2);
    margin: var(--spacing-6) auto;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

/* Tablet and below */
@media (max-width: 768px) {
    .form-row {
        flex-direction: column;
    }

    .submit-btn {
        width: 100%;
        min-width: 0;
    }

    .hero {
        padding: var(--spacing-4);
        padding-top: calc(64px + var(--spacing-4));
    }

    .subscribe-form {
        padding: var(--spacing-5);
    }

    .secondary-feed-link {
        min-width: 0;
    }

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

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

@media (max-width: 600px) {
    .hero-content {
        width: calc(100vw - var(--spacing-6));
        max-width: 360px;
        margin: 0 auto;
    }

    .trust-badge {
        max-width: 100%;
    }

    .alert-example {
        display: none;
    }
}

/* Mobile */
@media (max-width: 480px) {
    .site-header {
        padding: var(--spacing-2) var(--spacing-3);
    }

    .hero {
        align-items: center;
        min-height: 100svh;
        padding: var(--spacing-4) var(--spacing-3);
        padding-top: calc(48px + var(--spacing-4));
        padding-bottom: var(--spacing-4);
    }

    .hero-content {
        display: flex;
        flex-direction: column;
        justify-content: center;
        min-height: calc(100svh - 48px - var(--spacing-8));
    }

    .hero h1 {
        font-size: 1.58rem;
        line-height: 1.08;
        margin-bottom: var(--spacing-2);
        text-wrap: balance;
        overflow-wrap: anywhere;
    }

    .hero-subtitle {
        font-size: 0.95rem;
        line-height: 1.38;
        margin-bottom: 0.95rem;
    }

    .subscribe-form {
        max-width: 100%;
        padding: 1rem;
        border-radius: 1.15rem;
    }

    .form-row {
        gap: 0.75rem;
    }

    .trust-badge {
        width: 100%;
        max-width: 100%;
        gap: var(--spacing-2);
        padding: 0.72rem 0.85rem;
        margin-bottom: 1rem;
        border-radius: 1rem;
    }

    .badge-primary {
        font-size: 0.92rem;
    }

    .badge-secondary {
        font-size: 0.8rem;
        line-height: 1.3;
    }

    .badge-icon {
        width: 40px;
        height: 40px;
        border-radius: 0.8rem;
        font-size: 1.16rem;
    }

    .form-group input,
    .submit-btn,
    .sms-toggle-btn {
        min-width: 0;
        padding-top: 0.86rem;
        padding-bottom: 0.86rem;
        border-radius: 0.86rem;
        font-size: 0.98rem;
    }

    .submit-btn,
    .sms-toggle-btn {
        white-space: normal;
    }

    .phone-toggle,
    .checkbox-group,
    .privacy-note {
        margin-top: 0.72rem;
    }

    .checkbox-label {
        font-size: 0.8rem;
        line-height: 1.36;
    }

    .privacy-note {
        gap: 0.35rem;
        font-size: 0.84rem;
        line-height: 1.34;
    }

    .privacy-note-secondary {
        display: none;
    }

    .alert-example {
        display: none;
    }

    .hero-secondary-action {
        margin-top: 0.92rem;
        padding-top: 0;
        border-top: 0;
    }

    .secondary-feed-link {
        padding: 0.68rem 1rem;
        border-color: rgba(255, 255, 255, 0.26);
        background: rgba(15, 23, 42, 0.58);
        color: rgba(255, 255, 255, 0.94);
        box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
        font-size: 0.84rem;
    }

    .secondary-feed-link-arrow {
        color: #FCD34D;
    }

    .scroll-indicator {
        display: none !important;
    }

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

    .feature {
        padding: var(--spacing-4);
    }

    .source-method,
    .search-intent,
    .features,
    .how-it-works,
    .faq {
        padding: var(--spacing-8) var(--spacing-4);
    }
}

@media (max-width: 480px) and (min-height: 760px) {
    .form-robot-cue {
        display: flex;
    }

    .checkbox-group {
        margin-top: 0.42rem;
    }
}

@media (max-width: 480px) and (max-height: 650px) {
    .hero {
        padding-top: calc(48px + var(--spacing-2));
        padding-bottom: var(--spacing-2);
    }

    .hero-content {
        min-height: calc(100svh - 48px - var(--spacing-4));
    }

    .trust-badge {
        padding: 0.55rem 0.7rem;
        margin-bottom: 0.72rem;
    }

    .badge-primary {
        font-size: 0.86rem;
    }

    .badge-secondary {
        font-size: 0.74rem;
    }

    .badge-icon {
        width: 34px;
        height: 34px;
        font-size: 1rem;
    }

    .hero h1 {
        font-size: 1.42rem;
        margin-bottom: 0.3rem;
    }

    .hero-subtitle {
        font-size: 0.86rem;
        line-height: 1.3;
        margin-bottom: 0.7rem;
    }

    .subscribe-form {
        padding: 0.75rem;
    }

    .form-row {
        gap: 0.58rem;
    }

    .form-group input,
    .submit-btn,
    .sms-toggle-btn {
        padding-top: 0.68rem;
        padding-bottom: 0.68rem;
        font-size: 0.92rem;
    }

    .phone-toggle,
    .checkbox-group,
    .privacy-note {
        margin-top: 0.5rem;
    }

    .checkbox-label {
        font-size: 0.74rem;
        line-height: 1.28;
    }

    .privacy-note {
        font-size: 0.76rem;
        line-height: 1.24;
    }

    .hero-secondary-action {
        margin-top: 0.62rem;
    }

    .secondary-feed-link {
        padding: 0.55rem 0.9rem;
        font-size: 0.78rem;
    }
}

@media (min-width: 769px) and (min-height: 760px) {
    .form-robot-cue {
        display: flex;
    }
}

/* ===================================
   ACCESSIBILITY
   =================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* Focus Styles */
a:focus-visible,
button:focus-visible,
input:focus-visible,
details:focus-visible {
    outline: 3px solid var(--color-cta);
    outline-offset: 2px;
}

/* High Contrast */
@media (prefers-contrast: high) {
    :root {
        --color-text: #000;
        --color-bg: #fff;
        --color-cta: #0000EE;
    }

    .submit-btn,
    .form-group input {
        border: 2px solid #000;
    }
}

/* ===================================
   SCROLL ANIMATIONS
   =================================== */

/* Base state - hidden and offset */
.animate-on-scroll {
    opacity: 0 !important;
    transform: translateY(50px) !important;
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.8s cubic-bezier(0.4, 0, 0.2, 1) !important;
    will-change: opacity, transform;
}

/* Visible state - animate in */
.animate-on-scroll.is-visible {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

/* Stagger animations for feature cards */
.features-grid .feature.animate-on-scroll:nth-child(1) {
    transition-delay: 0s;
}

.features-grid .feature.animate-on-scroll:nth-child(2) {
    transition-delay: 0.1s;
}

.features-grid .feature.animate-on-scroll:nth-child(3) {
    transition-delay: 0.2s;
}

/* Stagger for steps */
.steps li.animate-on-scroll:nth-child(1) {
    transition-delay: 0s;
}

.steps li.animate-on-scroll:nth-child(2) {
    transition-delay: 0.15s;
}

.steps li.animate-on-scroll:nth-child(3) {
    transition-delay: 0.3s;
}

/* Stagger for FAQ items */
.faq-item.animate-on-scroll:nth-child(1) {
    transition-delay: 0s;
}

.faq-item.animate-on-scroll:nth-child(2) {
    transition-delay: 0.1s;
}

.faq-item.animate-on-scroll:nth-child(3) {
    transition-delay: 0.2s;
}

.faq-item.animate-on-scroll:nth-child(4) {
    transition-delay: 0.3s;
}

/* ===================================
   RESPONSIVE HEADER
   =================================== */

/* Tablet */
@media (max-width: 768px) {
    .site-header {
        padding: var(--spacing-3) var(--spacing-4);
    }

    .brand-name {
        font-size: var(--font-size-lg);
    }

    .brand-logo {
        height: 28px;
    }
}

/* Mobile */
@media (max-width: 600px) {
    .site-header {
        padding: var(--spacing-3);
        gap: var(--spacing-2);
    }

    .header-brand {
        flex: 1;
        min-width: 0;
        gap: var(--spacing-2);
    }

    .brand-name {
        font-size: var(--font-size-base);
        font-weight: 700;
    }

    .brand-separator {
        display: none;
    }

    .brand-tagline {
        display: none;
    }

    .brand-logo-link {
        display: inline-flex;
        flex-shrink: 0;
        margin-left: 0;
    }

    .brand-logo {
        height: 22px;
    }

    .site-header .lang-switcher {
        flex-shrink: 0;
        padding: var(--spacing-1) var(--spacing-3);
        font-size: var(--font-size-xs);
    }
}

/* Small Mobile */
@media (max-width: 380px) {
    .site-header {
        padding: var(--spacing-2) var(--spacing-3);
    }

    .brand-name {
        font-size: 0.8rem;
    }

    .brand-logo {
        height: 20px;
    }
}