/**
 * Family Tree Website - Main Stylesheet
 * Modern, clean design with nature/tree theme
 */

/* ===========================
   CSS Variables - Color Palette
   =========================== */
:root {
    /* Primary Colors - Nature Theme */
    --primary-green: #2d5016;
    --primary-light-green: #4a7c2e;
    --primary-dark-green: #1a3309;
    
    /* Tree/Leaf Colors */
    --leaf-male: #4a90e2;
    --leaf-female: #e75480;
    --leaf-other: #9b59b6;
    --trunk-brown: #5d4037;
    --branch-brown: #795548;
    
    /* UI Colors */
    --background-color: #f8f9fa;
    --card-background: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #6c757d;
    --text-light: #95a5a6;
    
    /* Interactive Elements */
    --accent-blue: #3498db;
    --accent-blue-hover: #2980b9;
    --success-green: #27ae60;
    --warning-yellow: #f39c12;
    --danger-red: #e74c3c;
    
    /* Borders & Shadows */
    --border-color: #dee2e6;
    --border-radius: 8px;
    --box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --box-shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 2rem;
}

/* ===========================
   Global Styles
   =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===========================
   Typography
   =========================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

h1 { font-size: var(--font-size-xxl); }
h2 { font-size: var(--font-size-xl); }
h3 { font-size: var(--font-size-lg); }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--accent-blue-hover);
}

/* ===========================
   Header Styles
   =========================== */
.header {
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--primary-light-green) 100%);
    color: white;
    padding: var(--spacing-lg) 0;
    box-shadow: var(--box-shadow);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-logo-link {
    text-decoration: none;
    color: inherit;
    transition: opacity 0.3s ease;
}

.header-logo-link:hover {
    opacity: 0.9;
}

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

.header-logo h1 {
    margin: 0;
    color: white;
    font-size: var(--font-size-xl);
}

.header-logo svg {
    width: 40px;
    height: 40px;
}

/* ===========================
   Welcome Page Styles
   =========================== */
.welcome-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.welcome-hero {
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--primary-light-green) 100%);
    color: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-xl);
}

.welcome-hero h1 {
    font-size: var(--font-size-xxl);
    margin-bottom: var(--spacing-md);
    color: white;
}

.welcome-hero p {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    margin-bottom: 0;
}

.welcome-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.welcome-link {
    background: var(--card-background);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
    box-shadow: var(--box-shadow);
}

.welcome-link:hover {
    border-color: var(--primary-green);
    box-shadow: var(--box-shadow-hover);
    transform: translateY(-2px);
    color: var(--text-primary);
}

.welcome-link-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    fill: var(--primary-green);
}

.welcome-link h3 {
    color: var(--primary-green);
    margin-bottom: var(--spacing-sm);
}

.welcome-link p {
    margin: 0;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.header-nav ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-lg);
    margin: 0;
}

.header-nav a {
    color: white;
    font-weight: 500;
    transition: opacity 0.3s ease;
}

.header-nav a:hover {
    opacity: 0.8;
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid white;
}

.logout-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background 0.3s ease;
}

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

/* ===========================
   Main Content
   =========================== */
.main-content {
    flex: 1;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* ===========================
   Cards
   =========================== */
.card {
    background: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.card-header {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.card-title {
    margin: 0;
    color: var(--primary-green);
}

/* ===========================
   Buttons
   =========================== */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark-green);
    box-shadow: var(--box-shadow-hover);
}

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

.btn-secondary:hover {
    background-color: var(--accent-blue-hover);
}

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

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

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

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

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===========================
   Forms
   =========================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    transition: border-color 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

select.form-control {
    cursor: pointer;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

.form-error {
    color: var(--danger-red);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

/* ===========================
   Family Tree Visualization
   =========================== */
#tree-container {
    width: 100%;
    height: 600px;
    background: linear-gradient(to bottom, #e8f5e9 0%, #f1f8e9 100%);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    position: relative;
}

.tree-controls {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
    z-index: 10;
}

/* Tree Node Styles */
.tree-node {
    cursor: pointer;
    transition: opacity 0.3s ease, filter 0.3s ease;
}

.tree-node:hover {
    opacity: 0.9;
    filter: brightness(1.1);
}

.tree-node.editable {
    filter: drop-shadow(0 0 5px rgba(74, 144, 226, 0.5));
}

.tree-node.read-only {
    opacity: 0.8;
}

/* Leaf Styles */
.leaf-male {
    fill: var(--leaf-male);
}

.leaf-female {
    fill: var(--leaf-female);
}

.leaf-other {
    fill: var(--leaf-other);
}

.tree-link {
    fill: none;
    stroke: var(--branch-brown);
    stroke-width: 2px;
}

.spouse-link {
    stroke-dasharray: 5, 5;
    stroke: var(--text-secondary);
}

/* ===========================
   Modal
   =========================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--box-shadow-hover);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

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

/* ===========================
   Login Page
   =========================== */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--primary-light-green) 100%);
}

.login-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-hover);
    text-align: center;
    max-width: 400px;
    width: 90%;
}

.login-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
}

.google-signin-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-md);
    background: white;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: box-shadow 0.3s ease;
}

.google-signin-btn:hover {
    box-shadow: var(--box-shadow-hover);
}

.google-icon {
    width: 20px;
    height: 20px;
}

/* ===========================
   Footer
   =========================== */
.footer {
    background-color: var(--primary-dark-green);
    color: white;
    padding: var(--spacing-lg) 0;
    margin-top: auto;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    text-align: center;
}

.footer p {
    margin: 0;
    opacity: 0.8;
}

/* ===========================
   Utilities
   =========================== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-secondary); }

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.d-flex { display: flex; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-md); }

.hidden { display: none; }

/* ===========================
   Loading Spinner
   =========================== */
.spinner {
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-green);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .header-nav ul {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    #tree-container {
        height: 400px;
    }
    
    .modal-content {
        width: 95%;
        padding: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .main-content {
        padding: var(--spacing-lg) var(--spacing-sm);
    }
}