/* 1. Root Variables */
:root {
    /* Color Palette */
    --color-bg-primary: #0f0f10;
    --color-bg-secondary: #1a1a1c;
    --color-beige: #d6c2a8;
    --color-cream: #f5f1ea;
    --color-brown: #8b7355;
    --color-text-primary: #f9fafb;
    --color-text-secondary: #b8b0a5;
    --color-glow: rgba(214, 194, 168, 0.3);
    --color-border: rgba(255, 255, 255, 0.08);

    /* Typography */
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;

    /* Borders & Shadows */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 10px 40px var(--color-glow);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* 2. Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 500;
    line-height: 1.2;
    color: var(--color-cream);
}

/* 3. Layout System */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 5%;
}

.max-w-lg { max-width: 800px; margin: 0 auto; }
.max-w-md { max-width: 600px; margin: 0 auto; }

.section {
    padding: var(--space-xl) 0;
}

.pt-header {
    padding-top: 120px;
}

.pb-0 { padding-bottom: 0; }
.pt-sm { padding-top: var(--space-md); }

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

.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    align-items: center;
}

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

/* 4. Header & Navigation */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: background-color 0.4s ease, backdrop-filter 0.4s ease;
}

.site-header.scrolled, .site-header.solid-header {
    background: rgba(26, 26, 28, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-beige);
    letter-spacing: 0.5px;
}

.main-nav ul {
    display: flex;
    gap: var(--space-md);
}

.main-nav a {
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    position: relative;
}

.main-nav a:hover, .main-nav a.active {
    color: var(--color-beige);
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-beige);
    transition: width var(--transition-smooth);
}

.main-nav a:hover::after, .main-nav a.active::after {
    width: 100%;
}

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

/* Mobile Menu */
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
    width: 30px;
    height: 20px;
    position: relative;
}

.mobile-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-cream);
    position: absolute;
    transition: var(--transition-fast);
}

.mobile-toggle span:nth-child(1) { top: 0; }
.mobile-toggle span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.mobile-toggle span:nth-child(3) { bottom: 0; }

.mobile-toggle.open span:nth-child(1) { top: 50%; transform: translateY(-50%) rotate(45deg); }
.mobile-toggle.open span:nth-child(2) { opacity: 0; }
.mobile-toggle.open span:nth-child(3) { bottom: 50%; transform: translateY(50%) rotate(-45deg); }

.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--color-bg-primary);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-smooth);
}

.mobile-menu-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.mobile-nav ul {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.mobile-nav a {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--color-cream);
}

/* 5. Hero Section */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.05); /* for zoom animation */
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(15, 15, 16, 0.9) 0%, rgba(15, 15, 16, 0.4) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 600px;
}

.hero-title {
    font-size: clamp(3rem, 5vw, 5rem);
    margin-bottom: var(--space-sm);
    color: var(--color-cream);
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.hero-buttons {
    display: flex;
    gap: var(--space-sm);
}

/* 6. Buttons */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: var(--radius-full);
    font-weight: 500;
    font-size: 1rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-smooth);
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--color-cream);
    box-shadow: 0 4px 15px rgba(214, 194, 168, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-beige);
    border-color: var(--color-beige);
}

.btn-secondary:hover {
    background-color: var(--color-beige);
    color: var(--color-bg-primary);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-text-primary);
    border-color: var(--color-border);
}

.btn-outline:hover {
    border-color: var(--color-beige);
    color: var(--color-beige);
}

.btn-large {
    padding: 16px 40px;
    font-size: 1.1rem;
}

.btn-full {
    width: 100%;
}

/* 7. Shared Section Styles */
.section-header {
    text-align: center;
    margin-bottom: var(--space-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--space-xs);
}

.section-desc {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
}

.page-title {
    font-size: clamp(2.5rem, 4vw, 4rem);
    margin-bottom: var(--space-sm);
}

.page-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    max-width: 800px;
    margin: 0 auto;
}

/* 8. Cat Cards */
.cat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-md);
}

.cat-card {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: var(--transition-smooth);
}

.cat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
    border-color: rgba(214, 194, 168, 0.2);
}

.cat-card-img {
    position: relative;
    height: 300px;
    overflow: hidden;
}

.cat-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s ease;
}

.cat-card:hover .cat-card-img img {
    transform: scale(1.08);
}

.cat-card-sweep {
    position: absolute;
    top: 0;
    left: -100%;
    width: 50%;
    height: 100%;
    background: linear-gradient(to right, transparent, rgba(255,255,255,0.1), transparent);
    transform: skewX(-20deg);
    transition: 0.7s;
}

.cat-card:hover .cat-card-sweep {
    left: 150%;
}

.cat-card-content {
    padding: var(--space-md);
}

.cat-card-content h3 {
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.cat-meta {
    font-size: 0.9rem;
    color: var(--color-beige);
    margin-bottom: var(--space-sm);
}

.cat-desc {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 9. Why Adopt List */
.feature-list {
    margin-top: var(--space-md);
}

.feature-list li {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(214, 194, 168, 0.1);
    color: var(--color-beige);
    border-radius: var(--radius-full);
    flex-shrink: 0;
    font-size: 1.2rem;
}

.feature-list h4 {
    font-family: var(--font-body);
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.feature-list p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* 10. How It Works */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-md);
}

.step-card {
    background: var(--color-bg-primary);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    text-align: center;
    transition: var(--transition-smooth);
}

.step-card:hover {
    transform: translateY(-5px);
    border-color: rgba(214, 194, 168, 0.3);
}

.step-number {
    width: 50px;
    height: 50px;
    margin: 0 auto var(--space-sm);
    background: var(--color-beige);
    color: var(--color-bg-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
}

.step-card h3 {
    font-size: 1.2rem;
    margin-bottom: var(--space-xs);
}

.step-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

/* 11. Donate CTA */
.donate-cta {
    position: relative;
    padding: 100px 0;
    overflow: hidden;
}

.donate-cta-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('images/photo-1513360371669-4adf3dd7dff8.png') no-repeat center center/cover;
    filter: brightness(0.3) sepia(0.2);
    z-index: 0;
}

.donate-cta .container {
    z-index: 1;
}

/* 12. Footer */
.site-footer {
    background: var(--color-bg-primary);
    border-top: 1px solid var(--color-border);
    padding: var(--space-lg) 0 var(--space-sm);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.footer-brand .logo {
    font-size: 1.8rem;
}

.footer-links h4, .footer-contact h4 {
    font-family: var(--font-heading);
    color: var(--color-cream);
    margin-bottom: var(--space-sm);
    font-size: 1.2rem;
}

.footer-links ul li {
    margin-bottom: 8px;
}

.footer-links a, .footer-contact p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

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

.footer-contact p {
    margin-bottom: 8px;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

/* 13. Specific Page Styles */
/* Cats Filters */
.filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-top: var(--space-md);
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    padding: 8px 20px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: var(--font-body);
}

.filter-btn.active, .filter-btn:hover {
    background: var(--color-beige);
    color: var(--color-bg-primary);
    border-color: var(--color-beige);
}

/* Cat Detail */
.back-link {
    display: inline-block;
    color: var(--color-beige);
    margin-bottom: var(--space-md);
    font-size: 0.95rem;
}
.back-link:hover {
    text-decoration: underline;
}

.cat-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.tags {
    display: flex;
    gap: 8px;
    margin-top: var(--space-xs);
}

.tag {
    background: rgba(214, 194, 168, 0.1);
    color: var(--color-beige);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
}

.stats-box {
    background: var(--color-bg-secondary);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.stat {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
}
.stat:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.stat-label {
    color: var(--color-text-secondary);
}

.cat-story h3 {
    margin-bottom: var(--space-sm);
}
.cat-story p {
    color: var(--color-text-secondary);
    margin-bottom: 12px;
}

/* Stories (Projects) */
.stories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: var(--space-md);
}

.story-card {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.story-card img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.story-content {
    padding: var(--space-md);
}
.story-content h3 {
    margin-bottom: var(--space-xs);
    font-size: 1.4rem;
}
.story-content p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* About Values */
.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.value-card {
    background: var(--color-bg-primary);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}
.value-icon {
    font-size: 2rem;
    color: var(--color-beige);
    margin-bottom: var(--space-sm);
}
.value-card h3 {
    margin-bottom: var(--space-xs);
}
.value-card p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* Contact */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-lg);
}

.info-card {
    background: var(--color-bg-secondary);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}
.info-card h3 {
    margin-bottom: var(--space-xs);
    color: var(--color-beige);
}
.info-card p {
    color: var(--color-text-secondary);
}

/* Forms */
.contact-form {
    background: var(--color-bg-secondary);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--color-cream);
    font-size: 0.9rem;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
textarea {
    width: 100%;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    padding: 14px;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--color-beige);
}

.full-width-input {
    width: 100%;
}

/* Donate Specific */
.donate-tiers {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-sm);
}

.tier input[type="radio"] {
    display: none;
}

.tier-box {
    display: block;
    text-align: center;
    padding: 15px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    font-weight: 500;
}

.tier input[type="radio"]:checked + .tier-box {
    background: var(--color-beige);
    color: var(--color-bg-primary);
    border-color: var(--color-beige);
}

.tier:hover .tier-box {
    border-color: var(--color-beige);
}

/* Legal Pages */
.legal-content h3 {
    margin-top: var(--space-md);
    margin-bottom: var(--space-xs);
    color: var(--color-beige);
}
.legal-content p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

/* Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-secondary { color: var(--color-text-secondary); }
.text-light { color: var(--color-cream); }
.text-sm { font-size: 0.9rem; }
.text-xs { font-size: 0.8rem; }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.relative { position: relative; }
.mx-auto { margin-left: auto; margin-right: auto; }

.rounded { border-radius: var(--radius-md); }
.shadow-soft { box-shadow: var(--shadow-soft); }

/* Animation Initial States */
.reveal {
    opacity: 0;
    transform: translateY(30px);
}

/* Responsive */
@media (max-width: 1024px) {
    .split-layout {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    .cat-detail-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .stories-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none;
    }
    .header-actions .btn {
        display: none;
    }
    .mobile-toggle {
        display: block;
    }
    .hero-title {
        font-size: 2.5rem;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .values-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .donate-tiers {
        grid-template-columns: 1fr 1fr;
    }
}