/* ===== RESET & BASE ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #25D366;
    --primary-dark: #128C7E;
    --primary-light: #DCF8C6;
    --accent: #6C63FF;
    --accent-light: #8B83FF;
    --dark: #0a0a0a;
    --dark-2: #1a1a2e;
    --dark-3: #16213e;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, #25D366 0%, #6C63FF 100%);
    --gradient-text: linear-gradient(135deg, #25D366 0%, #6C63FF 50%, #25D366 100%);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--gray-900);
    background: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s;
}

ul {
    list-style: none;
}

/* ===== NAVBAR ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-200);
    padding: 16px 0;
    transition: all 0.3s;
}

.navbar.scrolled {
    padding: 12px 0;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-img {
    border-radius: 6px;
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-700);
    transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-dark);
}

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

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--gray-800);
    border-radius: 2px;
    transition: all 0.3s;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    border-radius: var(--radius-xl);
    transition: all 0.3s;
    cursor: pointer;
    border: none;
    font-family: inherit;
    text-align: center;
    justify-content: center;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    box-shadow: 0 4px 14px rgba(37, 211, 102, 0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 211, 102, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--gray-800);
    border: 2px solid var(--gray-300);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-sm {
    padding: 8px 20px;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1rem;
}

/* ===== HERO ===== */
.hero {
    position: relative;
    padding: 140px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 30% 20%, rgba(37, 211, 102, 0.06) 0%, transparent 50%),
                radial-gradient(ellipse at 70% 80%, rgba(108, 99, 255, 0.06) 0%, transparent 50%);
    z-index: -1;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--gray-100);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 24px;
}

.badge-icon {
    color: var(--primary-dark);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--gray-600);
    margin-bottom: 32px;
    max-width: 520px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

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

.stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--gray-500);
}

/* ===== PHONE MOCKUP ===== */
.hero-visual {
    display: flex;
    justify-content: center;
}

.phone-mockup {
    width: 320px;
    background: var(--gray-900);
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(255,255,255,0.1) inset;
    transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
    transition: transform 0.5s;
}

.phone-mockup:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}

.phone-screen {
    background: #ECE5DD;
    border-radius: 30px;
    overflow: hidden;
    height: 520px;
    display: flex;
    flex-direction: column;
}

.chat-header {
    background: var(--primary-dark);
    color: white;
    padding: 14px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.chat-avatar {
    width: 36px;
    height: 36px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.chat-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.chat-status {
    font-size: 0.75rem;
    opacity: 0.8;
}

.chat-messages {
    flex: 1;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    overflow-y: auto;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23000000' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.message {
    max-width: 80%;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.82rem;
    line-height: 1.4;
    animation: fadeInUp 0.5s ease forwards;
    opacity: 0;
}

.message:nth-child(1) { animation-delay: 0.3s; }
.message:nth-child(2) { animation-delay: 0.8s; }
.message:nth-child(3) { animation-delay: 1.3s; }
.message:nth-child(4) { animation-delay: 1.8s; }
.message:nth-child(5) { animation-delay: 2.3s; }

.message.received {
    background: white;
    align-self: flex-start;
    border-bottom-left-radius: 2px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.08);
}

.message.sent {
    background: var(--primary-light);
    align-self: flex-end;
    border-bottom-right-radius: 2px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.08);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== FEATURES ===== */
.features {
    padding: 100px 0;
    background: var(--gray-100);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--gray-600);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--white);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    transition: all 0.3s;
}

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

.feature-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(37, 211, 102, 0.1) 0%, rgba(108, 99, 255, 0.1) 100%);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    color: var(--primary-dark);
    transition: all 0.3s;
}

.feature-card:hover .feature-icon {
    background: linear-gradient(135deg, rgba(37, 211, 102, 0.15) 0%, rgba(108, 99, 255, 0.15) 100%);
    color: var(--primary);
    transform: scale(1.05);
}

.feature-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--gray-600);
    line-height: 1.6;
}

/* ===== HOW IT WORKS ===== */
.how-it-works {
    padding: 100px 0;
}

.steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
}

.step {
    text-align: center;
    padding: 40px 32px;
    background: var(--gray-100);
    border-radius: var(--radius-lg);
    flex: 1;
    max-width: 300px;
}

.step-number {
    width: 48px;
    height: 48px;
    background: var(--gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    margin: 0 auto 16px;
}

.step h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.step p {
    font-size: 0.9rem;
    color: var(--gray-600);
}

.step-arrow {
    color: var(--gray-400);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== COMMANDS ===== */
.commands {
    padding: 100px 0;
    background: var(--gray-100);
}

.commands-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    max-width: 900px;
    margin: 0 auto;
}

.command-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    background: var(--white);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
    transition: all 0.2s;
}

.command-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.command-card code {
    background: var(--dark-2);
    color: var(--primary);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
}

.command-card span {
    font-size: 0.9rem;
    color: var(--gray-700);
}

/* ===== CTA ===== */
.cta {
    padding: 100px 0;
}

.cta-content {
    text-align: center;
    background: var(--dark-2);
    padding: 80px 40px;
    border-radius: var(--radius-xl);
    color: white;
    position: relative;
    overflow: hidden;
}

.cta-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(37, 211, 102, 0.15) 0%, transparent 60%);
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    position: relative;
}

.cta-content p {
    font-size: 1.1rem;
    color: var(--gray-400);
    margin-bottom: 32px;
    position: relative;
}

.cta-content .btn {
    position: relative;
}

/* ===== FOOTER ===== */
.footer {
    padding: 60px 0 30px;
    border-top: 1px solid var(--gray-200);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand p {
    margin-top: 12px;
    font-size: 0.9rem;
    color: var(--gray-600);
    max-width: 280px;
}

.footer-links h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--gray-800);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-size: 0.85rem;
    color: var(--gray-600);
    transition: color 0.2s;
}

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

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 24px;
    border-top: 1px solid var(--gray-200);
    font-size: 0.85rem;
    color: var(--gray-500);
}

.footer-legal-links {
    display: flex;
    gap: 24px;
}

.footer-legal-links a {
    color: var(--gray-500);
    font-size: 0.85rem;
}

.footer-legal-links a:hover {
    color: var(--primary-dark);
}

/* ===== LEGAL PAGES ===== */
.legal-page {
    padding: 120px 0 80px;
    min-height: 70vh;
}

.legal-content {
    max-width: 800px;
    margin: 0 auto;
}

.legal-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.last-updated {
    color: var(--gray-500);
    font-size: 0.9rem;
    margin-bottom: 40px;
}

.legal-content section {
    margin-bottom: 36px;
}

.legal-content h2 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--gray-900);
}

.legal-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    margin-top: 16px;
    color: var(--gray-800);
}

.legal-content p {
    color: var(--gray-700);
    margin-bottom: 12px;
    line-height: 1.7;
}

.legal-content ul {
    padding-left: 24px;
    margin-bottom: 12px;
}

.legal-content li {
    color: var(--gray-700);
    margin-bottom: 8px;
    line-height: 1.6;
    list-style: disc;
}

.legal-content a {
    color: var(--primary-dark);
    text-decoration: underline;
}

.legal-content code {
    background: var(--gray-100);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.9rem;
    color: var(--primary-dark);
    font-weight: 600;
}

/* Data Deletion Steps */
.deletion-method {
    background: var(--gray-100);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 20px;
}

.deletion-method h3 {
    margin-top: 0;
}

.steps-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 16px;
}

.step-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.step-num {
    width: 28px;
    height: 28px;
    min-width: 28px;
    background: var(--gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.8rem;
}

.step-item p {
    margin: 0;
    padding-top: 3px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid var(--gray-200);
        box-shadow: var(--shadow-md);
    }

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

    .mobile-toggle {
        display: flex;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero-visual {
        order: -1;
    }

    .phone-mockup {
        width: 280px;
        transform: none;
    }

    .phone-mockup:hover {
        transform: none;
    }

    .phone-screen {
        height: 420px;
    }

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

    .steps {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
    }

    .step {
        max-width: 100%;
    }

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

    .cta-content {
        padding: 50px 24px;
    }

    .cta-content h2 {
        font-size: 1.8rem;
    }

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

    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .hero-stats {
        gap: 24px;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .legal-content h1 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }

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

    .btn-lg {
        width: 100%;
    }
}