/**
 * Nebula Pet Passport - Shared Design System
 * Version: 1.0.0
 *
 * This file contains all shared styles for the marketing website.
 * All pages should include this file for consistent styling.
 */

/* ============================================
   CSS Variables - Design Tokens
   ============================================ */
:root {
    /* Primary Colors */
    --color-primary: #1976D2;
    --color-primary-dark: #0D47A1;
    --color-primary-light: #42A5F5;

    /* Secondary/Accent Colors */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;

    /* Neutral Colors */
    --color-white: #ffffff;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;

    /* Text Colors */
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-muted: #888888;
    --text-inverse: #ffffff;

    /* Background Colors */
    --bg-body: #f5f5f5;
    --bg-card: #ffffff;
    --bg-elevated: #f8fafc;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    --font-size-4xl: 2.25rem;   /* 36px */
    --font-size-5xl: 3rem;      /* 48px */

    /* Font Weights */
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;

    /* Line Heights */
    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;

    /* Spacing */
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;

    /* Layout */
    --max-width: 1200px;
    --max-width-narrow: 800px;
    --max-width-wide: 1400px;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background-color: var(--bg-body);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

img {
    max-width: 100%;
    height: auto;
}

/* ============================================
   Navigation Bar
   ============================================ */
.site-nav {
    background: linear-gradient(135deg, #1976D2 0%, #0D47A1 100%);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    height: 60px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #ffffff;
    text-decoration: none;
    font-weight: 700;
    font-size: 18px;
    line-height: 1.5;
}

.nav-brand:hover {
    text-decoration: none;
    opacity: 0.9;
    color: #ffffff;
}

.nav-brand svg {
    width: 28px;
    height: 28px;
    fill: currentColor;
}

.nav-links {
    display: flex;
    gap: 4px;
    list-style: none;
    align-items: center;
    margin: 0;
    padding: 0;
}

.nav-links li {
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    transition: background 0.15s ease;
    display: block;
    line-height: 1.5;
}

.nav-links a:hover {
    background: rgba(255, 255, 255, 0.15);
    text-decoration: none;
    color: #ffffff;
}

.nav-links a.active {
    background: rgba(255, 255, 255, 0.2);
    color: #ffffff;
}

/* Dropdown Menu */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
}

.nav-dropdown-toggle::after {
    content: "";
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid currentColor;
    margin-left: 2px;
}

.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: #ffffff;
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    min-width: 220px;
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    z-index: 1001;
    margin-top: 8px;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.open .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown-menu a {
    display: block;
    padding: 10px 16px;
    color: #334155 !important;
    font-size: 14px;
    font-weight: 500;
    border-radius: 0;
    transition: background 0.15s ease;
}

.nav-dropdown-menu a:hover {
    background: #f1f5f9 !important;
    color: #1976D2 !important;
}

.nav-dropdown-menu .dropdown-label {
    display: block;
    padding: 8px 16px 4px;
    color: #94a3b8;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-dropdown-menu .dropdown-divider {
    height: 1px;
    background: #e2e8f0;
    margin: 8px 0;
}

.nav-dropdown-menu-wide {
    min-width: 220px;
}

.nav-dropdown-menu-wide a {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: #ffffff;
    font-size: 24px;
    cursor: pointer;
    padding: 8px;
    line-height: 1;
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav-container {
        flex-wrap: wrap;
        height: auto;
        padding: 12px 16px;
    }

    .nav-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        padding: 12px 0;
        gap: 0;
    }

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

    .nav-links a {
        padding: 12px 16px;
        border-radius: 4px;
    }

    /* Mobile dropdown */
    .nav-dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: rgba(255, 255, 255, 0.1);
        border-radius: 4px;
        margin: 4px 0 4px 16px;
        padding: 4px 0;
        display: none;
    }

    .nav-dropdown.open .nav-dropdown-menu {
        display: block;
    }

    .nav-dropdown-menu a {
        color: rgba(255, 255, 255, 0.9) !important;
        padding: 10px 16px;
    }

    .nav-dropdown-menu a:hover {
        background: rgba(255, 255, 255, 0.15) !important;
        color: #ffffff !important;
    }

    .nav-dropdown-menu .dropdown-label {
        color: rgba(255, 255, 255, 0.6);
    }

    .nav-dropdown-menu .dropdown-divider {
        background: rgba(255, 255, 255, 0.2);
    }

    .nav-dropdown-toggle {
        width: 100%;
        justify-content: space-between;
    }
}

/* ============================================
   Page Layout
   ============================================ */
.page-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.page-content {
    flex: 1;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-5);
}

.container-narrow {
    max-width: var(--max-width-narrow);
    margin: 0 auto;
    padding: 0 var(--space-5);
}

/* ============================================
   Page Header
   ============================================ */
.page-header {
    background: var(--bg-card);
    padding: var(--space-12) var(--space-5);
    text-align: center;
    border-bottom: 1px solid var(--color-gray-200);
}

.page-header h1 {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-bold);
    color: var(--color-primary);
    margin-bottom: var(--space-3);
    line-height: var(--leading-tight);
}

.page-header .subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.page-header .badge {
    display: inline-block;
    background: var(--color-success);
    color: var(--text-inverse);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-semibold);
    margin-left: var(--space-3);
    vertical-align: middle;
}

.page-header .badge-warning,
.page-header .badge-amber {
    background: var(--color-warning);
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: var(--space-16) var(--space-5);
}

.section-alt {
    background: var(--bg-elevated);
}

.section-white {
    background: var(--bg-card);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    text-align: center;
    margin-bottom: var(--space-3);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-10);
}

/* ============================================
   Cards
   ============================================ */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-md);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
    max-width: var(--max-width);
    margin: 0 auto;
}

@media (max-width: 900px) {
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .card-grid {
        grid-template-columns: 1fr;
    }
}

/* Feature Card */
.feature-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.feature-card .icon {
    width: 64px;
    height: 64px;
    background: rgba(25, 118, 210, 0.1);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-4);
    font-size: var(--font-size-2xl);
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.feature-card p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
}

/* Content Card */
.content-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-6);
}

.content-card h2 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-bold);
    color: var(--color-primary);
    margin-bottom: var(--space-4);
}

.content-card h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-top: var(--space-5);
    margin-bottom: var(--space-2);
}

.content-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
    line-height: var(--leading-relaxed);
}

.content-card ul {
    margin: var(--space-4) 0 var(--space-4) var(--space-6);
}

.content-card li {
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
    line-height: var(--leading-relaxed);
}

/* ============================================
   Highlight Boxes
   ============================================ */
.highlight-box {
    padding: var(--space-5);
    border-radius: var(--radius-md);
    margin: var(--space-5) 0;
}

.highlight-box-blue {
    background: rgba(25, 118, 210, 0.08);
    border-left: 4px solid var(--color-primary);
}

.highlight-box-green {
    background: rgba(16, 185, 129, 0.08);
    border-left: 4px solid var(--color-success);
}

.highlight-box-amber {
    background: rgba(245, 158, 11, 0.08);
    border-left: 4px solid var(--color-warning);
}

.highlight-box-red {
    background: rgba(239, 68, 68, 0.08);
    border-left: 4px solid var(--color-error);
}

.highlight-box strong {
    color: var(--text-primary);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: var(--font-semibold);
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all var(--transition-normal);
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    text-decoration: none;
    color: var(--text-inverse);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--color-primary);
    color: var(--text-inverse);
    text-decoration: none;
}

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

.btn-success:hover {
    background: #059669;
    text-decoration: none;
    color: var(--text-inverse);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-lg);
}

.btn-block {
    width: 100%;
}

/* ============================================
   Forms
   ============================================ */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.1);
}

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

/* ============================================
   Footer
   ============================================ */
.site-footer {
    background: var(--bg-card);
    padding: var(--space-8) var(--space-5);
    text-align: center;
    border-top: 1px solid var(--color-gray-200);
    margin-top: auto;
}

.site-footer p {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-2);
}

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

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

/* ============================================
   Utilities
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }
.text-muted { color: var(--text-muted); }

.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.hidden { display: none; }

/* ============================================
   Responsive Typography
   ============================================ */
@media (max-width: 768px) {
    .page-header h1 {
        font-size: var(--font-size-3xl);
    }

    .section-title {
        font-size: var(--font-size-2xl);
    }

    .section {
        padding: var(--space-10) var(--space-4);
    }
}