/* =====================================================
   Social Media Downloader - Styles
   HydroStructAI
===================================================== */

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --background: #ffffff;
    --surface: #f8fafc;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --radius-lg: 12px;
}

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

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

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

/* =====================================================
   Navigation
===================================================== */

.navbar {
    background: var(--background);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

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

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-brand i {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* =====================================================
   Hero Section
===================================================== */

.hero {
    padding: 4rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.hero-badges {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.badge {
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.quick-install {
    background: rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
}

.quick-install p {
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.code-box {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(0, 0, 0, 0.2);
    padding: 1rem;
    border-radius: var(--radius);
    font-family: 'Courier New', monospace;
}

.code-box code {
    flex: 1;
    font-size: 1rem;
}

.copy-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    color: white;
    cursor: pointer;
    transition: background 0.2s;
    white-space: nowrap;
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* =====================================================
   Buttons
===================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 1rem;
}

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

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

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

.btn-secondary:hover {
    background: var(--surface);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* =====================================================
   Sections
===================================================== */

section {
    padding: 4rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 3rem;
}

/* =====================================================
   Features Grid
===================================================== */

.features {
    background: var(--surface);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

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

/* =====================================================
   Web App Section
===================================================== */

.web-app-section {
    background: white;
}

.app-container {
    max-width: 700px;
    margin: 0 auto;
    background: var(--surface);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-select, .form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: border-color 0.2s;
    background: white;
}

.form-select:focus, .form-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.url-input-wrapper {
    display: flex;
    gap: 0.5rem;
}

.url-input-wrapper .form-input {
    flex: 1;
}

.paste-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background 0.2s;
}

.paste-btn:hover {
    background: var(--primary-dark);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.action-buttons .btn {
    flex: 1;
    justify-content: center;
}

.info-box {
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    border-radius: var(--radius);
    padding: 1rem;
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
    color: #1e40af;
}

.info-box i {
    font-size: 1.25rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.info-box a {
    color: var(--primary-color);
    font-weight: 600;
}

.status-message {
    margin-top: 1.5rem;
    padding: 1rem 1.25rem;
    border-radius: var(--radius);
}

.status-message.success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #6ee7b7;
}

.status-message.error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.status-message.loading {
    background: #dbeafe;
    color: #1e40af;
    border: 1px solid #93c5fd;
    text-align: center;
}

.status-message code {
    display: block;
    background: #1e293b;
    color: #e2e8f0;
    padding: 10px 14px;
    border-radius: 6px;
    margin: 8px 0;
    word-break: break-all;
    font-size: 0.9rem;
}

/* =====================================================
   CLI Section
===================================================== */

.cli-section {
    background: var(--surface);
}

.cli-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.check-list {
    list-style: none;
}

.check-list li {
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.check-list i {
    color: var(--success-color);
    font-size: 1.125rem;
}

.code-block {
    background: #1e293b;
    border-radius: var(--radius);
    overflow: hidden;
    margin-top: 1rem;
}

.code-header {
    background: #0f172a;
    padding: 0.75rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #94a3b8;
    font-size: 0.875rem;
}

.code-header button {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    padding: 0.375rem 0.75rem;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background 0.2s;
    font-size: 0.8rem;
}

.code-header button:hover {
    background: rgba(255, 255, 255, 0.2);
}

.code-block pre {
    padding: 1.5rem;
    margin: 0;
    overflow-x: auto;
}

.code-block code {
    color: #e2e8f0;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.8;
}

.cli-examples {
    margin-top: 2rem;
}

/* =====================================================
   Documentation Section
===================================================== */

.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.doc-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.2s;
    text-align: center;
}

.doc-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    color: var(--text-primary);
}

.doc-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.doc-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.doc-card p {
    color: var(--text-secondary);
}

/* =====================================================
   Footer
===================================================== */

.footer {
    background: #0f172a;
    color: #94a3b8;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: white;
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #94a3b8;
    text-decoration: none;
    transition: color 0.2s;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #334155;
    padding-top: 1.5rem;
    text-align: center;
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

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

/* =====================================================
   Responsive Design
===================================================== */

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .nav-links {
        gap: 1rem;
        font-size: 0.875rem;
    }

    .cli-content {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .action-buttons {
        flex-direction: column;
    }

    .app-container {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.75rem;
    }

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

    .nav-links {
        display: none;
    }
}