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

:root {
    --primary: #5a6b4e;
    --primary-dark: #3d4a35;
    --secondary: #b8941f;
    --accent: #d4a520;
    --text: #e8e8e8;
    --text-light: #a0a0a0;
    --bg: #1a1d1a;
    --bg-alt: #252826;
    --card-bg: #2d322e;
    --border: #404540;
    --success: #6b8e5a;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    padding-top: 70px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    padding: 30px 0;
    text-align: center;
    border-bottom: 2px solid var(--secondary);
}

header h1 {
    font-size: 2rem;
    color: var(--secondary);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
}

header p {
    color: var(--text-light);
    margin-top: 8px;
}

main {
    padding: 40px 20px;
}

.calculator-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.input-section {
    display: grid;
    gap: 20px;
    margin-bottom: 30px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

label {
    color: var(--text);
    font-weight: 600;
    margin-bottom: 8px;
}

select, input {
    background: var(--bg-alt);
    border: 2px solid var(--border);
    color: var(--text);
    padding: 12px;
    border-radius: 8px;
    font-size: 1rem;
}

select:focus, input:focus {
    outline: none;
    border-color: var(--secondary);
}

button {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--accent) 100%);
    color: var(--bg);
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s;
}

button:hover {
    transform: translateY(-2px);
}

#results {
    border-top: 2px solid var(--border);
    padding-top: 30px;
}

#results h2 {
    color: var(--secondary);
    margin-bottom: 20px;
    text-align: center;
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

.result-column {
    background: var(--bg-alt);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
}

.result-column h3 {
    color: var(--primary);
    margin-bottom: 15px;
}

.result-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--secondary);
    margin: 10px 0;
}

.result-label {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 15px;
}

.difference-section {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
}

.difference-section p {
    font-size: 1.2rem;
    color: var(--text);
    font-weight: 600;
}

.back-link {
    text-align: center;
    margin-top: 30px;
}

.back-link a {
    color: var(--secondary);
    text-decoration: none;
    font-size: 1.1rem;
}

.back-link a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    .result-value {
        font-size: 1.5rem;
    }
}

/* STICKY HEADER */
.sticky-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    backdrop-filter: blur(10px);
    border-bottom: 2px solid var(--secondary);
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo a {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--secondary);
    text-decoration: none;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
}

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

.main-nav {
    display: flex;
    gap: 40px;
    margin-right: 60px;
}

.nav-dropdown {
    position: relative;
}

.nav-dropdown::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 10px;
    display: none;
}

.nav-dropdown:hover::after {
    display: block;
}

.nav-btn {
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.05rem;
    font-weight: 700;
    cursor: pointer;
    padding: 12px 20px;
    border-radius: 6px;
    transition: all 0.2s;
    letter-spacing: 0.3px;
}

.nav-btn:hover {
    background: rgba(184, 148, 31, 0.2);
    color: var(--secondary);
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 5px);
    left: 0;
    min-width: 280px;
    max-height: calc(100vh - 80px);
    overflow-y: auto;
    background: var(--card-bg);
    border: 2px solid var(--secondary);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
    padding: 12px;
    z-index: 100;
}

.nav-dropdown:hover .dropdown-menu,
.dropdown-menu:hover {
    display: block;
}
.dropdown-menu.show-menu { display: block !important; }
@media (hover: none) and (pointer: coarse) {
    .nav-dropdown:hover .dropdown-menu,
    .dropdown-menu:hover { display: none; }
    .dropdown-menu.show-menu { display: block !important; }
}

.dropdown-section {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.dropdown-section:last-child {
    border-bottom: none;
}

.dropdown-label {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--secondary);
    font-weight: 700;
    margin-bottom: 8px;
    padding: 0 12px;
}

.dropdown-menu a {
    display: block;
    padding: 10px 12px;
    color: var(--text-light);
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.dropdown-menu a:hover {
    background: var(--primary-dark);
    color: var(--secondary);
    padding-left: 16px;
}

@media (max-width: 768px) {
    .nav-btn {
        padding: 8px 12px;
        font-size: 0.9rem;
    }
    .dropdown-menu {
        right: 0;
        left: auto;
        min-width: 240px;
    }
}

/* SEO CONTENT */
.seo-content {
    background: var(--bg-alt);
    padding: 60px 0;
    margin-top: 60px;
    border-top: 2px solid var(--secondary);
}

.seo-content .container {
    max-width: 800px;
}

.seo-content h2 {
    font-size: 1.8rem;
    color: var(--secondary);
    margin-bottom: 40px;
    margin-top: 60px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

.seo-content h2:first-child {
    margin-top: 0;
}

.seo-content h3 {
    font-size: 1.3rem;
    color: var(--text);
    margin-top: 40px;
    margin-bottom: 24px;
}

.seo-content p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-light);
    margin-bottom: 24px;
}

.example-card {
    background: var(--card-bg);
    padding: 24px;
    border-radius: 8px;
    border-left: 4px solid var(--secondary);
    margin: 24px 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.example-card h4 {
    color: var(--secondary);
    margin-bottom: 16px;
    font-size: 1.1rem;
}

.example-card p {
    margin-bottom: 12px;
}

.seo-content details {
    background: var(--card-bg);
    padding: 24px;
    border-radius: 6px;
    margin-bottom: 16px;
    border: 1px solid var(--border);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.seo-content summary {
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
}

.seo-content summary:hover {
    color: var(--secondary);
}

.seo-content details[open] summary {
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}