:root {
    --primary-color: #0063dc; /* Flickr Blue */
    --secondary-color: #ff0084; /* Flickr Pink */
    --text-color: #1d1d1f;
    --text-muted: #86868b;
    --bg-color: #ffffff;
    --bg-light: #f5f5f7;
    --border-color: #d2d2d7;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

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

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Nav */
.header {
    height: 70px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.header .container {
    width: 100%;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    gap: 40px;
}

.logo-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.logo {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 30px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #ffffff !important;
}

.btn-primary:hover {
    background-color: #0051b3;
    transform: translateY(-1px);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.9rem;
}

/* Hero Section */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, #fff 0%, #f0f7ff 100%);
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -1.5px;
}

.hero-title span {
    color: var(--primary-color);
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.store-buttons {
    display: flex;
    gap: 20px;
}

.store-link img {
    height: 54px;
    transition: var(--transition);
}

.store-link:hover img {
    opacity: 0.8;
    transform: scale(1.02);
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

.phone-mockup {
    width: 280px;
    height: 560px;
    background: #000;
    border-radius: 40px;
    padding: 12px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    position: relative;
    border: 8px solid #333;
}

.phone-mockup::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 25px;
    background: #000;
    border-bottom-left-radius: 15px;
    border-bottom-right-radius: 15px;
    z-index: 10;
}

.app-screen {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 24px;
    background-color: #f8f9fa;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Sections */
.section {
    padding: 100px 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 50px;
    letter-spacing: -1px;
}

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

.bg-light {
    background-color: var(--bg-light);
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    padding: 40px;
    background: white;
    border-radius: 20px;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    border: 1px solid transparent;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 50px;
    height: 50px;
    background: rgba(0, 99, 220, 0.1);
    color: var(--primary-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 24px;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-muted);
}

/* URL Examples */
.section-subtitle {
    margin-top: -40px;
    margin-bottom: 50px;
    color: var(--text-muted);
}

.url-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 15px;
}

.url-item {
    background: white;
    padding: 15px 20px;
    border-radius: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid var(--border-color);
}

.url-item code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.95rem;
    color: var(--primary-color);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    padding-right: 10px;
}

.copy-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.1rem;
    transition: var(--transition);
}

.copy-btn:hover {
    color: var(--secondary-color);
}

/* Disclaimer */
.disclaimer-card {
    background: #fff5f9;
    padding: 40px;
    border-radius: 24px;
    border: 1px dashed var(--secondary-color);
}

.disclaimer-card .section-title {
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.disclaimer-card p {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 15px;
}

/* Footer */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 15px;
}

.footer-links .separator {
    color: var(--border-color);
}

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

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

/* Legal Content */
.legal-header {
    padding: 60px 0 40px;
    background: var(--bg-light);
    text-align: center;
}

.legal-header h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -1.5px;
    margin-bottom: 10px;
}

.legal-header .last-updated {
    color: var(--text-muted);
}

.legal-content {
    padding: 80px 0;
    max-width: 800px;
    margin: 0 auto;
}

.legal-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 40px 0 20px;
    color: var(--text-color);
}

.legal-content p {
    margin-bottom: 20px;
    color: #444;
}

.legal-content ul {
    margin-bottom: 24px;
    padding-left: 20px;
}

.legal-content li {
    margin-bottom: 12px;
}

.legal-content a {
    color: var(--primary-color);
    text-decoration: none;
}

.legal-content a:hover {
    text-decoration: underline;
}

/* Responsive */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-color);
    cursor: pointer;
    z-index: 1001;
}

@media (max-width: 991px) {
    .hero-title {
        font-size: 2.75rem;
    }
    .hero .container {
        flex-direction: column;
        text-align: center;
        gap: 40px;
    }
    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    .store-buttons {
        justify-content: center;
    }
    .url-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav {
        gap: 0;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px;
        gap: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    }

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

    .nav-links a {
        width: 100%;
        text-align: center;
        padding: 10px 0;
    }

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

    .section {
        padding: 60px 0;
    }
    .hero-title {
        font-size: 2.25rem;
    }
}