:root {
    /* Color Palette & Semantics */
    --heading-color: #0F172A;
    --text-color: #334155;
    --bg-color: #F8FAFC;
    --card-bg: #FFFFFF;
    --gray-color: #64748B;
    --border-color: #E2E8F0;
    --footer-bg: #0F172A;
    --footer-text: #FFFFFF;
    --btn-outline-text: #0F172A;
    --header-bg: rgba(255, 255, 255, 0.85);

    /* Shared */
    --secondary-color: #3B82F6;
    --accent-color: #10B981;
    --border-radius: 20px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 40px -10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1280px;
}

[data-theme="dark"] {
    --heading-color: #F8FAFC;
    --text-color: #e5e5e5;
    --bg-color: #0a0a0a;
    --card-bg: #1a1a1a;
    --gray-color: #a3a3a3;
    --border-color: #333333;
    --footer-bg: #111111;
    --footer-text: #e5e5e5;
    --btn-outline-text: #F8FAFC;
    --header-bg: rgba(26, 26, 26, 0.85);
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.5);
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 20px 40px -10px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Utilities */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
}

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

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

h1, h2, h3, h4, h5, h6 {
    color: var(--heading-color);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
    transition: color 0.3s ease;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: 12px;
    font-weight: 700;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 1rem;
    gap: 8px;
}

.btn-primary {
    background-color: var(--secondary-color);
    color: #FFFFFF;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    background-color: #2563EB;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--secondary-color);
}

.btn-secondary:hover {
    background-color: rgba(59, 130, 246, 0.2);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    border-color: var(--btn-outline-text);
    background: var(--btn-outline-text);
    color: var(--bg-color);
}

.theme-toggle-btn {
    background: transparent;
    border: none;
    color: var(--gray-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px;
    border-radius: 12px;
    transition: var(--transition);
}
.theme-toggle-btn:hover {
    background: var(--border-color);
    color: var(--heading-color);
}
.theme-toggle-btn svg {
    width: 20px;
    height: 20px;
}

/* Header */
header {
    background: var(--header-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--heading-color);
    letter-spacing: -0.03em;
}

.logo span {
    color: var(--secondary-color);
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    font-weight: 600;
    color: var(--gray-color);
    font-size: 0.95rem;
}

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

/* Bento Hero Search */
.hero-search {
    position: relative;
    width: 100%;
    max-width: 600px;
    margin: 30px 0;
    z-index: 10;
}

.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 8px 8px 8px 24px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.search-input-wrapper:focus-within {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.search-input-wrapper input {
    border: none;
    outline: none;
    flex-grow: 1;
    font-size: 1.1rem;
    color: var(--heading-color);
    background: transparent;
    font-family: inherit;
    padding-right: 16px;
}

.search-input-wrapper input::placeholder {
    color: #94A3B8;
}

.search-btn-icon {
    background: var(--secondary-color);
    color: #FFFFFF;
    border: none;
    border-radius: 12px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.search-btn-icon:hover {
    background: #2563EB;
}

/* Live Search Dropdown */
.live-search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--card-bg);
    border-radius: 16px;
    margin-top: 10px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    display: none;
    z-index: 100;
}

.live-search-results.active {
    display: block;
}

.live-search-item {
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-color);
    font-weight: 600;
}

.live-search-item:last-child {
    border-bottom: none;
}

.live-search-item:hover {
    background: var(--bg-color);
    color: var(--heading-color);
}

.live-search-meta {
    font-size: 0.8rem;
    color: var(--gray-color);
    background: var(--border-color);
    padding: 4px 8px;
    border-radius: 6px;
}

/* Bento Grid System */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 24px;
    margin: 40px 0;
}

.bento-item {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 32px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.bento-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Specific Bento Sizes */
.col-span-12 { grid-column: span 12; }
.col-span-8 { grid-column: span 8; }
.col-span-6 { grid-column: span 6; }
.col-span-4 { grid-column: span 4; }
.col-span-3 { grid-column: span 3; }

/* Bento Media Blocks */
.bento-media {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}

.bento-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(to top, rgba(10, 10, 10, 0.9), transparent);
    padding: 32px;
    z-index: 2;
    color: #FFFFFF;
}

.bento-overlay h3 {
    color: #FFFFFF;
}

/* Tools Range Sliders */
.range-group {
    margin-bottom: 24px;
}

.range-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    font-weight: 600;
}

.range-val {
    color: var(--secondary-color);
    font-weight: 800;
    background: rgba(59, 130, 246, 0.1);
    padding: 4px 12px;
    border-radius: 8px;
}

input[type=range] {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 24px;
    width: 24px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 3px solid var(--secondary-color);
    cursor: pointer;
    margin-top: -8px;
    box-shadow: var(--shadow-sm);
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 8px;
    cursor: pointer;
    background: var(--border-color);
    border-radius: 4px;
}

/* Calculator UI */
.calc-result-box {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: 32px;
    border-radius: 16px;
    text-align: center;
    margin-top: 24px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.calc-result-box h4 {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

[data-theme="dark"] .calc-result-box h4 {
    color: var(--gray-color);
}

.calc-result-value {
    font-size: 3rem;
    font-weight: 900;
    color: var(--accent-color);
}

/* Visual Progress Bar */
.progress-bar-bg {
    width: 100%;
    height: 12px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    margin-top: 16px;
    overflow: hidden;
}

[data-theme="dark"] .progress-bar-bg {
    background: rgba(255, 255, 255, 0.05);
}

.progress-bar-fill {
    height: 100%;
    background: var(--accent-color);
    border-radius: 6px;
    transition: width 0.5s ease-out;
}

/* Typography & Layout */
.section-header {
    margin-bottom: 40px;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--gray-color);
    max-width: 600px;
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.modern-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.modern-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary-color);
}

.modern-card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.modern-card-body {
    padding: 24px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.tag {
    background: var(--bg-color);
    color: var(--heading-color);
    font-size: 0.8rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 6px;
    display: inline-block;
    margin-bottom: 12px;
    border: 1px solid var(--border-color);
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--heading-color);
    text-align: left;
    width: 100%;
}

.form-control {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-family: inherit;
    font-size: 1rem;
    background: var(--bg-color);
    color: var(--text-color);
    transition: var(--transition);
    text-align: left;
}

.form-control:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.form-control::placeholder {
    color: var(--gray-color);
    text-align: left;
}

/* Breadcrumbs */
.breadcrumbs {
    padding: 1rem 0;
    font-size: 0.875rem;
    color: var(--gray-color);
    display: flex;
    align-items: center;
    gap: 8px;
}
.breadcrumbs a {
    color: var(--secondary-color);
    font-weight: 600;
    text-decoration: none;
}
.breadcrumbs a:hover {
    text-decoration: underline;
}
.breadcrumbs span.separator {
    color: var(--border-color);
}

/* Related Pages Section */
.related-pages {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}
.related-pages h3 {
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}
.related-pages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}
.related-card {
    padding: 1.5rem;
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}
.related-card:hover {
    border-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}
.related-card h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}
.related-card p {
    font-size: 0.9rem;
    color: var(--gray-color);
    margin-bottom: 0;
}

/* Footer */
footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: 80px 0 40px;
    margin-top: 80px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.footer-links h4 {
    color: var(--footer-text);
    margin-bottom: 20px;
    font-size: 1.1rem;
}

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

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
}

[data-theme="dark"] .footer-links a {
    color: var(--gray-color);
}

.footer-links a:hover {
    color: #FFFFFF;
    padding-left: 5px;
}

/* Animations */
.reveal-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-on-scroll.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
    .col-span-8, .col-span-6, .col-span-4, .col-span-3 {
        grid-column: span 6;
    }
}

@media (max-width: 768px) {
    .bento-grid {
        grid-template-columns: 1fr;
    }
    .col-span-12, .col-span-8, .col-span-6, .col-span-4, .col-span-3 {
        grid-column: span 1;
    }
    .nav-links {
        display: none;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
}