/* ===== CSS Variables ===== */
:root {
    --primary: #6C63FF;
    --primary-dark: #5A52D5;
    --primary-light: #8B85FF;
    --secondary: #FF6B6B;
    --accent: #4ECDC4;
    --gradient-1: linear-gradient(135deg, #6C63FF 0%, #4ECDC4 100%);
    --gradient-2: linear-gradient(135deg, #FF6B6B 0%, #FFD93D 100%);
    --gradient-3: linear-gradient(135deg, #6C63FF 0%, #FF6B6B 100%);

    --bg-primary: #0F0F1A;
    --bg-secondary: #1A1A2E;
    --bg-tertiary: #16213E;
    --bg-card: rgba(26, 26, 46, 0.8);
    --bg-card-hover: rgba(108, 99, 255, 0.1);

    --text-primary: #FFFFFF;
    --text-secondary: #B8B8D4;
    --text-muted: #6B6B8D;

    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(108, 99, 255, 0.3);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px rgba(108, 99, 255, 0.3);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    --transition-fast: 0.2s ease;
    --transition-normal: 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: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
    list-style: none;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

section {
    padding: 100px 0;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    white-space: nowrap;
}

.btn-sm {
    padding: 10px 20px;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 18px 36px;
    font-size: 1.125rem;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
    box-shadow: 0 4px 16px rgba(108, 99, 255, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(108, 99, 255, 0.5);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-outline:hover {
    border-color: var(--primary);
    background: rgba(108, 99, 255, 0.1);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-hover);
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    background: rgba(15, 15, 26, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 800;
}

.logo-icon {
    font-size: 1.8rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

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

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

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

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

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--primary);
    top: -200px;
    right: -100px;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--accent);
    bottom: -100px;
    left: -100px;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: var(--secondary);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(108, 99, 255, 0.15);
    border: 1px solid rgba(108, 99, 255, 0.3);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--primary-light);
    margin-bottom: 24px;
}

.hero h1 {
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 500px;
}

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

.hero-stats {
    display: flex;
    align-items: center;
    gap: 24px;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border-color);
}

/* Phone Mockup */
.phone-mockup {
    width: 280px;
    height: 560px;
    background: var(--bg-secondary);
    border-radius: 36px;
    padding: 12px;
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    margin: 0 auto;
    position: relative;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    border-radius: 24px;
    overflow: hidden;
}

.app-preview {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.app-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.app-logo-small {
    font-size: 1.2rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.app-header span {
    font-weight: 600;
    font-size: 0.95rem;
}

.chat-preview {
    flex: 1;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.chat-bubble {
    max-width: 85%;
    padding: 12px 16px;
    border-radius: 16px;
    font-size: 0.875rem;
    line-height: 1.5;
}

.chat-bubble.user {
    background: var(--primary);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}

.chat-bubble.agent {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-bottom-left-radius: 4px;
}

.typing-indicator {
    display: flex;
    gap: 4px;
    margin-bottom: 8px;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
    0%, 100% { opacity: 0.3; transform: scale(0.8); }
    50% { opacity: 1; transform: scale(1); }
}

/* ===== Section Headers ===== */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-top: 16px;
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(108, 99, 255, 0.15);
    border: 1px solid rgba(108, 99, 255, 0.3);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--primary-light);
    margin-bottom: 16px;
}

/* ===== Features Grid ===== */
.features-preview {
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition-normal);
}

.feature-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.features-cta {
    text-align: center;
    margin-top: 48px;
}

/* ===== Security Section ===== */
.security-section {
    background: var(--bg-primary);
}

.security-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.security-text h2 {
    margin-bottom: 20px;
}

.security-text > p {
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-size: 1.125rem;
}

.security-features {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.security-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.05rem;
}

.check-icon {
    color: var(--accent);
    font-weight: 700;
    font-size: 1.2rem;
}

.shield-graphic {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 300px;
    height: 300px;
    margin: 0 auto;
}

.shield-outer {
    font-size: 12rem;
    position: absolute;
    opacity: 0.2;
}

.shield-inner {
    position: relative;
    background: var(--gradient-1);
    border-radius: 50%;
    width: 150px;
    height: 150px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
}

.shield-inner span {
    font-size: 2.5rem;
    font-weight: 800;
}

.shield-inner small {
    font-size: 1rem;
    opacity: 0.9;
}

/* ===== How It Works ===== */
.how-it-works {
    background: var(--bg-secondary);
}

.steps-container {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
}

.step {
    text-align: center;
    max-width: 280px;
    flex: 1;
}

.step-number {
    width: 64px;
    height: 64px;
    background: var(--gradient-1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    margin: 0 auto 24px;
    box-shadow: 0 4px 16px rgba(108, 99, 255, 0.4);
}

.step-connector {
    width: 100px;
    height: 2px;
    background: var(--border-color);
    margin-top: 32px;
    flex-shrink: 0;
}

.step-content h3 {
    margin-bottom: 12px;
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ===== Use Cases ===== */
.use-cases {
    background: var(--bg-primary);
}

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

.use-case-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: all var(--transition-normal);
}

.use-case-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.use-case-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.use-case-card h3 {
    margin-bottom: 12px;
}

.use-case-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ===== CTA Section ===== */
.cta-section {
    background: var(--bg-secondary);
    text-align: center;
}

.cta-content h2 {
    margin-bottom: 20px;
}

.cta-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.cta-buttons {
    margin-bottom: 16px;
}

.cta-note {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-tertiary);
    padding: 64px 0 32px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 64px;
    margin-bottom: 48px;
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: 12px;
    max-width: 280px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer-column h4 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.footer-column a {
    display: block;
    color: var(--text-secondary);
    font-size: 0.95rem;
    padding: 6px 0;
}

.footer-column a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ===== Page Header (for sub-pages) ===== */
.page-header {
    padding: 140px 0 60px;
    text-align: center;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
    margin-bottom: 16px;
}

.page-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Content Page ===== */
.content-page {
    padding: 80px 0;
}

.content-page .container {
    max-width: 800px;
}

.content-page h2 {
    font-size: 1.75rem;
    margin: 48px 0 20px;
    color: var(--text-primary);
}

.content-page h3 {
    font-size: 1.25rem;
    margin: 32px 0 12px;
    color: var(--text-primary);
}

.content-page p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.8;
}

.content-page ul, .content-page ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.content-page li {
    color: var(--text-secondary);
    margin-bottom: 8px;
    line-height: 1.7;
}

.content-page ul li {
    list-style-type: disc;
}

.content-page ol li {
    list-style-type: decimal;
}

.content-page a {
    color: var(--primary-light);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.content-page a:hover {
    color: var(--primary);
}

.content-page strong {
    color: var(--text-primary);
    font-weight: 600;
}

.content-page .highlight-box {
    background: rgba(108, 99, 255, 0.1);
    border: 1px solid rgba(108, 99, 255, 0.3);
    border-radius: var(--radius-md);
    padding: 24px;
    margin: 24px 0;
}

.content-page .last-updated {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

/* ===== Download Page ===== */
.download-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-bottom: 64px;
}

.download-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 48px;
    text-align: center;
    transition: all var(--transition-normal);
}

.download-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}

.download-card.recommended {
    border-color: var(--primary);
    background: rgba(108, 99, 255, 0.05);
    position: relative;
}

.download-card.recommended::before {
    content: 'Recommended';
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-1);
    color: white;
    padding: 4px 16px;
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 600;
}

.download-icon {
    font-size: 4rem;
    margin-bottom: 24px;
}

.download-card h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.download-card p {
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.download-features {
    text-align: left;
    margin-bottom: 32px;
}

.download-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    color: var(--text-secondary);
}

.download-features li::before {
    content: '✓';
    color: var(--accent);
    font-weight: 700;
}

.download-info {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 24px;
}

.download-info h4 {
    margin-bottom: 16px;
    font-size: 1rem;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.info-item {
    text-align: left;
}

.info-item label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.info-item span {
    font-size: 0.95rem;
    color: var(--text-primary);
}

/* ===== FAQ Page ===== */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 24px;
    background: none;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 1.1rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    transition: var(--transition-fast);
}

.faq-question:hover {
    color: var(--primary-light);
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 300;
    transition: transform var(--transition-normal);
    flex-shrink: 0;
}

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

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

.faq-answer-content {
    padding: 0 24px 24px;
    color: var(--text-secondary);
    line-height: 1.8;
}

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

/* ===== Contact Page ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: all var(--transition-normal);
}

.contact-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.contact-card h3 {
    margin-bottom: 12px;
}

.contact-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.contact-card .btn {
    width: 100%;
}

/* ===== Data Safety Page ===== */
.data-category {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 24px;
}

.data-category h3 {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.data-items {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

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

.data-item-icon {
    color: var(--accent);
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 2px;
}

.data-item-text h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.data-item-text p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0;
}

/* ===== Features Page ===== */
.feature-detail {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 48px;
    align-items: center;
    padding: 80px 0;
    border-bottom: 1px solid var(--border-color);
}

.feature-detail:nth-child(even) {
    direction: rtl;
}

.feature-detail:nth-child(even) > * {
    direction: ltr;
}

.feature-detail-text h3 {
    font-size: 2rem;
    margin-bottom: 16px;
}

.feature-detail-text p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 24px;
}

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

.feature-detail-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
}

.feature-detail-list li::before {
    content: '✦';
    color: var(--primary);
}

.feature-visual {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 48px;
    text-align: center;
}

.feature-visual-icon {
    font-size: 6rem;
    margin-bottom: 24px;
}

.feature-visual p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

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

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

    .hero-visual {
        display: none;
    }

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

    .security-content {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }

    .security-features {
        align-items: center;
    }

    .steps-container {
        flex-direction: column;
        align-items: center;
    }

    .step-connector {
        width: 2px;
        height: 40px;
        margin: 0;
    }

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

    .download-options {
        grid-template-columns: 1fr;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .feature-detail {
        grid-template-columns: 1fr;
    }

    .feature-detail:nth-child(even) {
        direction: ltr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .navbar .btn {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

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

    .use-cases-grid {
        grid-template-columns: 1fr;
    }

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

    .data-items {
        grid-template-columns: 1fr;
    }

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

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

    .hero-buttons .btn {
        width: 100%;
        max-width: 300px;
    }
}

@media (max-width: 480px) {
    section {
        padding: 64px 0;
    }

    .container {
        padding: 0 16px;
    }

    .btn-lg {
        padding: 14px 24px;
        font-size: 1rem;
    }

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

/* ===== Animations ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.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);
}

/* ===== Mobile Menu ===== */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    z-index: 999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 32px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.mobile-menu.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu a {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.mobile-menu-close {
    position: absolute;
    top: 24px;
    right: 24px;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 2rem;
    cursor: pointer;
}