/* ============================================
   GMOコイン口座開設ガイチE- スタイルシーチE
   ============================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;600;700;800&display=swap');

/* --- CSS Variables --- */
:root {
    /* Brand Colors - GMOコインの靁E*/
    --primary-900: #0c2d5a;
    --primary-800: #0f3a73;
    --primary-700: #144d96;
    --primary-600: #1a5fb5;
    --primary-500: #2070cc;
    --primary-400: #3b8ae0;
    --primary-300: #5ea3eb;
    --primary-200: #8ec0f3;
    --primary-100: #c4dff9;
    --primary-50: #ebf4ff;

    /* Accent */
    --accent-500: #f59e0b;
    --accent-400: #fbbf24;

    /* Success / Info */
    --success-500: #10b981;
    --success-100: #d1fae5;

    /* Neutrals */
    --gray-900: #111827;
    --gray-800: #1f2937;
    --gray-700: #374151;
    --gray-600: #4b5563;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --gray-50: #f9fafb;
    --white: #ffffff;

    /* Layout */
    --max-width: 1100px;
    --section-padding: 80px 0;
    --border-radius: 16px;
    --border-radius-sm: 10px;
    --border-radius-xs: 6px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 16px 50px rgba(0, 0, 0, 0.12);
    --shadow-blue: 0 8px 30px rgba(32, 112, 204, 0.2);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--gray-800);
    background-color: var(--white);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    color: var(--primary-500);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-700);
}

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

/* --- Utility --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--primary-500);
    background: var(--primary-50);
    padding: 6px 16px;
    border-radius: 50px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 16px;
    line-height: 1.4;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--gray-500);
    max-width: 640px;
    margin: 0 auto 48px;
    line-height: 1.8;
}

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

/* ============================================
   HEADER / NAVIGATION
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    transition: box-shadow var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.15rem;
    color: var(--primary-700);
    text-decoration: none;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 800;
    font-size: 0.9rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-600);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-500);
    transition: width var(--transition-base);
}

.nav-links a:hover {
    color: var(--primary-600);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
    color: white !important;
    padding: 10px 22px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-blue);
    color: white !important;
}

.nav-cta::after {
    display: none !important;
}

/* Mobile menu */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: var(--transition-base);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(165deg, var(--primary-50) 0%, var(--white) 50%, var(--primary-50) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -120px;
    right: -120px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(32, 112, 204, 0.06) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -80px;
    left: -80px;
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, rgba(32, 112, 204, 0.04) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-inner {
    display: flex;
    align-items: center;
    gap: 60px;
    position: relative;
    z-index: 1;
}

.hero-content {
    flex: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--white);
    border: 1px solid var(--primary-100);
    padding: 8px 18px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary-600);
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
    animation: fadeInUp 0.6s ease;
}

.hero-badge .badge-dot {
    width: 8px;
    height: 8px;
    background: var(--success-500);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.6;
        transform: scale(0.8);
    }
}

.hero-title {
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1.35;
    color: var(--gray-900);
    margin-bottom: 20px;
    animation: fadeInUp 0.6s ease 0.1s backwards;
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.05rem;
    color: var(--gray-500);
    line-height: 1.9;
    margin-bottom: 36px;
    max-width: 480px;
    animation: fadeInUp 0.6s ease 0.2s backwards;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    animation: fadeInUp 0.6s ease 0.3s backwards;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
    color: white;
    padding: 16px 36px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 700;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    border: none;
    cursor: pointer;
    text-decoration: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-blue);
    color: white;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--white);
    color: var(--primary-600);
    padding: 16px 36px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    border: 2px solid var(--primary-200);
    transition: all var(--transition-fast);
    text-decoration: none;
    cursor: pointer;
}

.btn-secondary:hover {
    background: var(--primary-50);
    border-color: var(--primary-400);
    color: var(--primary-700);
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    animation: fadeInRight 0.8s ease 0.3s backwards;
}

.hero-image img {
    max-width: 460px;
    border-radius: var(--border-radius);
    /* box-shadow: var(--shadow-xl); */
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--gray-200);
    animation: fadeInUp 0.6s ease 0.4s backwards;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-600);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-top: 2px;
}

/* ============================================
   WHY GMO SECTION
   ============================================ */
.why-section {
    padding: var(--section-padding);
    background: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.feature-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 36px 28px;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-400), var(--primary-600));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.feature-card:hover {
    border-color: var(--primary-200);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-50);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 0.92rem;
    color: var(--gray-500);
    line-height: 1.8;
}

/* ============================================
   STEPS SECTION
   ============================================ */
.steps-section {
    padding: var(--section-padding);
    background: linear-gradient(180deg, var(--gray-50) 0%, var(--primary-50) 100%);
}

.steps-container {
    max-width: 1060px;
    margin: 0 auto;
}

.step-card {
    display: flex;
    gap: 28px;
    align-items: flex-start;
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 40px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.step-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.step-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--primary-400), var(--primary-600));
}

.step-number-wrap {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.step-number {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 800;
    box-shadow: var(--shadow-blue);
}

.step-icon-img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
}

.step-content {
    flex: 1;
    min-width: 0;
}

.step-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.step-content p {
    font-size: 0.95rem;
    color: var(--gray-600);
    line-height: 1.85;
    margin-bottom: 16px;
}

.step-tips {
    background: var(--primary-50);
    border-radius: var(--border-radius-sm);
    padding: 18px 22px;
    margin-top: 12px;
}

.step-tips .tip-title {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--primary-600);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.step-tips ul {
    list-style: none;
    padding: 0;
}

.step-tips li {
    font-size: 0.88rem;
    color: var(--gray-600);
    padding: 4px 0;
    padding-left: 18px;
    position: relative;
    line-height: 1.7;
}

.step-tips li::before {
    content: '✁E;
    position: absolute;
    left: 0;
    color: var(--primary-500);
    font-weight: 700;
    font-size: 0.8rem;
}

/* Step screen image - side layout */
.step-screen-side {
    flex-shrink: 0;
    width: 280px;
    align-self: center;
}

.step-screen-side .step-screen-img {
    width: 100%;
    display: block;
    border-radius: var(--border-radius-sm);
    transition: transform var(--transition-base);
}

.step-screen-side .step-screen-img:hover {
    transform: scale(1.03);
}

/* Connector line between steps */
.step-connector {
    display: flex;
    justify-content: center;
    padding: 0 0 0 70px;
    margin: -8px 0;
}

.step-connector .line {
    width: 2px;
    height: 32px;
    background: linear-gradient(180deg, var(--primary-300), var(--primary-200));
    border-radius: 2px;
}

/* ============================================
   IDENTITY VERIFICATION SECTION
   ============================================ */
.identity-section {
    padding: var(--section-padding);
    background: var(--white);
}

.id-methods {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.id-method-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 32px 24px;
    text-align: center;
    transition: all var(--transition-base);
    position: relative;
}

.id-method-card.recommended {
    border-color: var(--primary-400);
    box-shadow: var(--shadow-blue);
}

.id-method-card.recommended::after {
    content: 'おすすめ�E�E;
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
    color: white;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: 50px;
    white-space: nowrap;
}

.id-method-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.id-method-icon {
    font-size: 2.2rem;
    margin-bottom: 16px;
}

.id-method-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 10px;
}

.id-method-card p {
    font-size: 0.85rem;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 16px;
}

.id-method-tag {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 50px;
    background: var(--success-100);
    color: var(--success-500);
}

.id-method-tag.slow {
    background: var(--gray-100);
    color: var(--gray-500);
}

/* ============================================
   DOCUMENTS SECTION
   ============================================ */
.documents-section {
    padding: var(--section-padding);
    background: var(--gray-50);
}

.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
    max-width: 860px;
    margin: 0 auto;
}

.doc-item {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-sm);
    padding: 18px 20px;
    transition: all var(--transition-fast);
}

.doc-item:hover {
    border-color: var(--primary-200);
    box-shadow: var(--shadow-sm);
}

.doc-icon {
    width: 42px;
    height: 42px;
    background: var(--primary-50);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.doc-item span {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-700);
}

/* ============================================
   REQUIREMENTS SECTION
   ============================================ */
.requirements-section {
    padding: var(--section-padding);
    background: var(--white);
}

.req-list {
    max-width: 760px;
    margin: 0 auto;
}

.req-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 18px 0;
    border-bottom: 1px solid var(--gray-100);
}

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

.req-check {
    width: 28px;
    height: 28px;
    background: var(--primary-50);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-500);
    font-size: 0.8rem;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 2px;
}

.req-item p {
    font-size: 0.95rem;
    color: var(--gray-600);
    line-height: 1.7;
}

/* ============================================
   FAQ SECTION
   ============================================ */
.faq-section {
    padding: var(--section-padding);
    background: var(--gray-50);
}

.faq-list {
    max-width: 760px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-sm);
    margin-bottom: 12px;
    overflow: hidden;
    transition: all var(--transition-base);
}

.faq-item:hover {
    border-color: var(--primary-200);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 22px 24px;
    background: none;
    border: none;
    font-family: inherit;
    font-size: 0.98rem;
    font-weight: 600;
    color: var(--gray-800);
    cursor: pointer;
    text-align: left;
    gap: 16px;
    transition: background var(--transition-fast);
}

.faq-question:hover {
    background: var(--gray-50);
}

.faq-icon {
    width: 28px;
    height: 28px;
    background: var(--primary-50);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: var(--primary-500);
    transition: transform var(--transition-base);
    flex-shrink: 0;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

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

.faq-item.active .faq-answer {
    max-height: 300px;
}

.faq-answer-inner {
    padding: 0 24px 22px;
    font-size: 0.92rem;
    color: var(--gray-600);
    line-height: 1.85;
}

/* ============================================
   CTA SECTION
   ============================================ */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-700) 0%, var(--primary-900) 100%);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
    border-radius: 50%;
}

.cta-inner {
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta-inner h2 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 16px;
}

.cta-inner p {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 36px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.btn-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--white);
    color: var(--primary-700);
    padding: 18px 44px;
    border-radius: 50px;
    font-size: 1.05rem;
    font-weight: 700;
    transition: all var(--transition-fast);
    text-decoration: none;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
    color: var(--primary-800);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--gray-900);
    padding: 48px 0 28px;
    color: var(--gray-400);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 40px;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.footer-brand {
    max-width: 320px;
}

.footer-brand .logo {
    color: var(--white);
    margin-bottom: 14px;
}

.footer-brand .logo-icon {
    background: linear-gradient(135deg, var(--primary-400), var(--primary-600));
}

.footer-brand p {
    font-size: 0.82rem;
    line-height: 1.7;
    color: var(--gray-500);
}

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

.footer-links-group h4 {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--gray-300);
    margin-bottom: 14px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links-group ul {
    list-style: none;
}

.footer-links-group li {
    margin-bottom: 8px;
}

.footer-links-group a {
    font-size: 0.82rem;
    color: var(--gray-500);
    transition: color var(--transition-fast);
}

.footer-links-group a:hover {
    color: var(--primary-400);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.75rem;
    color: var(--gray-600);
}

.footer-disclaimer {
    font-size: 0.72rem;
    color: var(--gray-600);
    line-height: 1.7;
    margin-top: 12px;
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(40px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Scroll-triggered animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   BACK TO TOP
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-blue);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(32, 112, 204, 0.35);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 992px) {
    .hero-inner {
        flex-direction: column;
        text-align: center;
    }

    .hero-description {
        max-width: 100%;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-image img {
        max-width: 360px;
    }

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

    .id-methods {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

    .footer-inner {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 56px 0;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        gap: 0;
        border-bottom: 1px solid var(--gray-200);
        box-shadow: var(--shadow-md);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        display: block;
        padding: 14px 0;
        border-bottom: 1px solid var(--gray-100);
    }

    .nav-links a::after {
        display: none;
    }

    .nav-cta {
        margin-top: 12px;
        justify-content: center;
    }

    .mobile-toggle {
        display: flex;
    }

    .hero {
        padding: 110px 0 60px;
    }

    .hero-title {
        font-size: 1.9rem;
    }

    .section-title {
        font-size: 1.6rem;
    }

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

    .step-card {
        flex-direction: column;
        padding: 28px;
        gap: 20px;
    }

    .step-screen-side {
        width: 100%;
        order: -1;
    }

    .step-screen-side .step-screen-img {
        max-width: 320px;
        margin: 0 auto;
    }

    .step-number-wrap {
        flex-direction: row;
        gap: 16px;
    }

    .step-connector {
        padding-left: 0;
        justify-content: flex-start;
        padding-left: 40px;
    }

    .hero-stats {
        gap: 24px;
    }

    .stat-value {
        font-size: 1.2rem;
    }

    .cta-inner h2 {
        font-size: 1.6rem;
    }

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.6rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-primary,
    .btn-secondary {
        justify-content: center;
    }

    .hero-stats {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }
}