:root {
    --primary-color: #007AFF;
    --primary-dark: #0056CC;
    --secondary-color: #5856D6;
    --accent-color: #FF6B6B;
    --text-primary: #1D1D1F;
    --text-secondary: #6E6E73;
    --text-light: #8E8E93;
    --background: #FFFFFF;
    --background-secondary: #F5F5F7;
    --border-color: #E5E5E7;
    --gradient-primary: linear-gradient(135deg, #007AFF 0%, #5856D6 100%);
    --gradient-secondary: linear-gradient(135deg, #FF6B6B 0%, #4ECDC4 100%);
    --shadow-small: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-large: 0 16px 64px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --border-radius-large: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 1.2rem;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-icon {
    width: 1.5rem;
    height: 1.5rem;
    filter: var(--logo-filter, brightness(0) saturate(100%));
}

.menubar-icon {
    width: 1rem;
    height: 1rem;
    filter: brightness(0) saturate(100%);
    vertical-align: middle;
}

.feature-svg-icon {
    width: 2rem;
    height: 2rem;
    filter: brightness(0) saturate(100%) invert(27%) sepia(51%) saturate(2878%) hue-rotate(346deg) brightness(104%) contrast(97%);
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 50%;
    background: var(--gradient-primary);
    transition: var(--transition);
    transform: translateX(-50%);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.bar {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #FAFBFF 0%, #F0F4FF 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: 600px;
    animation: fadeInUp 0.8s ease-out;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--text-primary);
}

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

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

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

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

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

.btn-large {
    padding: 18px 36px;
    font-size: 1.1rem;
}

.btn-icon {
    transition: var(--transition);
}

.btn:hover .btn-icon {
    transform: translateX(4px);
}

.hero-badges {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.app-store-preview {
    margin-top: 20px;
    text-align: center;
}

.preview-text {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 500;
    margin: 0;
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 24px;
    border: 1px solid var(--border-color);
    display: inline-block;
}

.badge {
    background: var(--background);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 24px;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-small);
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeInRight 0.8s ease-out 0.2s both;
}

.app-mockup {
    position: relative;
    transform: perspective(1000px) rotateY(-15deg) rotateX(10deg);
    transition: var(--transition);
}

.app-mockup:hover {
    transform: perspective(1000px) rotateY(-10deg) rotateX(5deg);
}

.menubar-demo {
    background: var(--background);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-large);
    padding: 20px;
    min-width: 300px;
    position: relative;
}

.menubar-item {
    background: var(--background-secondary);
    padding: 12px 20px;
    border-radius: 8px;
    font-weight: 600;
    margin-bottom: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.menubar-item:hover {
    background: var(--primary-color);
    color: white;
}

.dropdown-menu {
    background: var(--background);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-medium);
    overflow: hidden;
    animation: slideDown 0.3s ease-out;
}

.menu-item {
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
    cursor: pointer;
}

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

.menu-item:hover {
    background: var(--background-secondary);
}

.conversation-demo {
    background: var(--background);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-large);
    width: 400px;
    max-height: 500px;
    margin-top: 20px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    animation: fadeInUp 0.5s ease-out 0.3s both;
}

.conversation-header {
    background: var(--background-secondary);
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.conversation-title {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.conversation-status {
    font-size: 0.8rem;
    color: var(--primary-color);
    background: rgba(0, 122, 255, 0.1);
    padding: 4px 8px;
    border-radius: 12px;
}

.conversation-messages {
    padding: 16px;
    max-height: 300px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.user-message {
    align-items: flex-end;
}

.ai-message {
    align-items: flex-start;
}

.message-content {
    max-width: 80%;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px;
    border-radius: 16px;
    font-size: 0.85rem;
    line-height: 1.4;
    position: relative;
}

.user-message .message-content {
    background: rgba(0, 122, 255, 0.1);
    color: var(--text-primary);
    flex-direction: row-reverse;
}

.ai-message .message-content {
    background: rgba(128, 128, 128, 0.1);
    color: var(--text-primary);
}

.screenshot-thumbnail {
    font-size: 1rem;
    opacity: 0.8;
}

.ai-avatar, .user-avatar {
    font-size: 1rem;
    filter: none;
}

.message-text {
    flex: 1;
}

.message-timestamp {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-top: 4px;
    opacity: 0.7;
}

.user-message .message-timestamp {
    text-align: right;
}

.conversation-input {
    border-top: 1px solid var(--border-color);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--background);
}

.input-field {
    flex: 1;
    padding: 8px 12px;
    background: var(--background-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.send-button {
    width: 32px;
    height: 32px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
}

.send-button:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

.features {
    padding: 100px 0;
    background: var(--background);
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--background);
    border-radius: var(--border-radius-large);
    padding: 40px 32px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition);
}

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

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-large);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 24px;
    display: block;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

.how-it-works {
    padding: 100px 0;
    background: var(--background-secondary);
}

.steps-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 48px;
    margin-top: 60px;
}

.step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    box-shadow: var(--shadow-medium);
}

.step-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.step-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

.privacy-highlight {
    padding: 100px 0;
    background: var(--background);
}

.privacy-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    align-items: center;
}

.privacy-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.privacy-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.6;
}

.privacy-list {
    list-style: none;
    margin-bottom: 32px;
}

.privacy-list li {
    padding: 12px 0;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.privacy-visual {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.shield-icon {
    font-size: 6rem;
    margin-bottom: 24px;
    opacity: 0.8;
}

.local-badge {
    background: var(--gradient-primary);
    color: white;
    padding: 16px 24px;
    border-radius: 24px;
    font-weight: 600;
    font-size: 1.1rem;
    box-shadow: var(--shadow-medium);
}

.download {
    padding: 100px 0;
    background: var(--background-secondary);
    text-align: center;
}

.download-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.download-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 48px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.download-description ul {
    list-style: none;
    margin-top: 16px;
    text-align: center;
}

.download-description li {
    padding: 8px 0;
    color: var(--text-secondary);
}

.download-requirements {
    background: var(--background);
    border-radius: var(--border-radius);
    padding: 32px;
    margin-bottom: 48px;
    text-align: left;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    box-shadow: var(--shadow-small);
}

.download-requirements h3 {
    margin-bottom: 16px;
    color: var(--text-primary);
}

.download-requirements ul {
    list-style: none;
}

.download-requirements li {
    padding: 8px 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 24px;
}

.download-requirements li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 24px;
    align-items: center;
}

.app-store-status {
    text-align: center;
    max-width: 400px;
}

.status-badge {
    display: inline-block;
    background: linear-gradient(135deg, #007AFF 0%, #5856D6 100%);
    color: white;
    padding: 12px 24px;
    border-radius: 24px;
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 16px;
    box-shadow: var(--shadow-medium);
    animation: pulse 2s infinite;
}

.status-text {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.5;
    margin: 0;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.9;
    }
}

.docs {
    padding: 100px 0;
    background: var(--background);
}

.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-top: 60px;
}

.doc-card {
    background: var(--background);
    border-radius: var(--border-radius);
    padding: 32px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    text-align: center;
}

.doc-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.doc-icon {
    font-size: 3rem;
    margin-bottom: 24px;
    display: block;
}

.doc-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.doc-description {
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
}

.doc-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.doc-link:hover {
    color: var(--primary-dark);
}

.footer {
    background: var(--text-primary);
    color: var(--background);
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 1.2rem;
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #333;
    color: var(--text-light);
}

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--background);
    margin: 5% auto;
    padding: 40px;
    border-radius: var(--border-radius-large);
    width: 90%;
    max-width: 600px;
    position: relative;
    animation: modalSlideIn 0.3s ease-out;
}

.close {
    position: absolute;
    right: 20px;
    top: 20px;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.close:hover {
    color: var(--text-primary);
}

.build-instructions h4 {
    margin: 24px 0 12px;
    color: var(--text-primary);
}

.build-instructions ul,
.build-instructions ol {
    margin-bottom: 20px;
    padding-left: 20px;
}

.build-instructions li {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.build-instructions code {
    background: var(--background-secondary);
    padding: 4px 8px;
    border-radius: 4px;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    color: var(--primary-color);
    display: block;
    margin: 8px 0;
    padding: 12px;
}

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

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(20px);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        box-shadow: var(--shadow-medium);
        padding: 20px 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(6px) rotate(45deg);
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-6px) rotate(-45deg);
    }

    .hero {
        text-align: center;
        padding: 100px 0 60px;
    }

    .hero-visual {
        margin-top: 40px;
    }

    .app-mockup {
        transform: none;
    }

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

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

    .steps-container {
        grid-template-columns: 1fr;
    }

    .privacy-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

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

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

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

    .app-store-status {
        text-align: center;
    }

    .conversation-demo {
        width: 100%;
        max-width: 350px;
        margin: 20px auto 0;
    }

    .message-content {
        max-width: 90%;
        font-size: 0.8rem;
        padding: 10px;
    }

    .conversation-header {
        padding: 10px 12px;
    }

    .conversation-title {
        font-size: 0.85rem;
    }

    .conversation-status {
        font-size: 0.75rem;
    }

    .message-timestamp {
        font-size: 0.65rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .feature-card,
    .doc-card {
        padding: 24px 20px;
    }

    .modal-content {
        margin: 10% auto;
        padding: 20px;
    }
}