/* ==========================================
   SoSo Family - Application Support
   Main Stylesheet
   ========================================== */

/* CSS Variables */
:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #3b82f6;

    --color-background: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;

    --color-success: #22c55e;
    --color-success-light: #dcfce7;
    --color-error: #ef4444;
    --color-error-light: #fee2e2;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-background);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ==========================================
   Header
   ========================================== */
.header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.25rem;
}

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

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

.nav-link {
    color: var(--color-text-muted);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

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

/* ==========================================
   Hero Section
   ========================================== */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    padding: var(--spacing-3xl) 0;
    text-align: center;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* ==========================================
   Apps Section
   ========================================== */
.apps {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-surface);
}

.apps-title {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.apps-subtitle {
    text-align: center;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-2xl);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    max-width: 900px;
    margin: 0 auto;
}

.app-card {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-base);
}

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

.app-icon {
    flex-shrink: 0;
    width: 80px;
    height: 80px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.app-icon-emoji {
    font-size: 2.5rem;
}

.app-icon-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-lg);
}

.app-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.app-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.app-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.app-badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-success-light);
    color: var(--color-success);
    border-radius: var(--radius-sm);
}

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

.app-description {
    font-size: 0.9375rem;
    color: var(--color-text);
    line-height: 1.5;
    margin: var(--spacing-sm) 0;
}

.app-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin: var(--spacing-sm) 0;
}

.feature-tag {
    font-size: 0.75rem;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
}

.app-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.meta-icon {
    font-size: 0.875rem;
}

.app-cta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.9375rem;
}

.cta-icon {
    transition: transform var(--transition-fast);
}

.app-card:hover .cta-icon {
    transform: translateX(4px);
}

@media (max-width: 480px) {
    .app-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .app-header {
        justify-content: center;
    }

    .app-features {
        justify-content: center;
    }

    .app-meta {
        justify-content: center;
    }

    .app-cta {
        justify-content: center;
    }
}

/* ==========================================
   Contact Section
   ========================================== */
.contact {
    flex: 1;
    padding: var(--spacing-3xl) 0;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

@media (max-width: 768px) {
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
}

/* Contact Info */
.contact-info h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.contact-info > p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
}

.info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.info-icon {
    font-size: 1.25rem;
    color: var(--color-primary);
}

.info-text {
    color: var(--color-text);
    font-weight: 500;
}

/* Family Sites */
.family-sites {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.family-sites h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.family-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.family-links li a {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.family-links li a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

.family-links li a::before {
    content: '→';
    font-size: 0.875rem;
}

/* Contact Form */
.contact-form-wrapper {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Form Groups */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-label {
    font-weight: 500;
    color: var(--color-text);
    font-size: 0.875rem;
}

.required {
    color: var(--color-error);
}

.form-input {
    width: 100%;
    padding: var(--spacing-md);
    font-size: 1rem;
    font-family: inherit;
    color: var(--color-text);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-input::placeholder {
    color: var(--color-text-muted);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input:invalid:not(:placeholder-shown) {
    border-color: var(--color-error);
}

.form-input.valid {
    border-color: var(--color-success);
}

.form-input.invalid {
    border-color: var(--color-error);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-error {
    display: none;
    font-size: 0.75rem;
    color: var(--color-error);
}

.form-group.has-error .form-error {
    display: block;
}

.form-group.has-error .form-input {
    border-color: var(--color-error);
}

/* Submit Button */
.submit-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    color: white;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    width: 100%;
}

.submit-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.submit-btn:active:not(:disabled) {
    transform: translateY(0);
}

.submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.submit-btn.loading {
    position: relative;
    color: transparent;
}

.submit-btn.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid white;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.submit-btn.success {
    background: var(--color-success);
}

/* Success/Error Messages */
.success-message,
.error-message {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-md);
    animation: slideIn var(--transition-slow) ease;
}

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

.success-message {
    background-color: var(--color-success-light);
    border: 1px solid var(--color-success);
}

.success-icon {
    font-size: 1.5rem;
    color: var(--color-success);
    font-weight: bold;
}

.success-content h3 {
    color: var(--color-success);
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
}

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

.error-message {
    background-color: var(--color-error-light);
    border: 1px solid var(--color-error);
}

.error-icon {
    font-size: 1.5rem;
    color: var(--color-error);
    font-weight: bold;
}

.error-content h3 {
    color: var(--color-error);
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
}

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

/* ==========================================
   Footer
   ========================================== */
.footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.footer-label {
    color: var(--color-text-muted);
}

.footer-link {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

/* ==========================================
   Responsive Adjustments
   ========================================== */
@media (max-width: 480px) {
    .header .container {
        height: 56px;
    }

    .hero {
        padding: var(--spacing-xl) 0;
    }

    .contact {
        padding: var(--spacing-xl) 0;
    }

    .contact-form-wrapper {
        padding: var(--spacing-lg);
    }
}

/* ==========================================
   Utility Classes
   ========================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}