/* css/style.css */
:root {
    /* Светлая тема (по умолчанию) */
    --primary-color: #0056b3;
    --primary-hover: #004494;
    --bg-color: #f8f9fa;
    --text-color: #333333;
    --text-muted: #6c757d;
    --card-bg: #ffffff;
    --border-radius: 8px;
    --border-color: #e9ecef;
    --input-bg: #ffffff;
    --result-bg: #f1f8ff;
    --result-border: #cce5ff;
    
    /* Цвета для шапки */
    --header-bg: #0056b3;
    --header-text: #ffffff;
}

/* Темная тема */
[data-theme="dark"] {
    --primary-color: #4da3ff;
    --primary-hover: #7bbaff;
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --text-muted: #a0a0a0;
    --card-bg: #1e1e1e;
    --border-color: #333333;
    --input-bg: #2d2d2d;
    --result-bg: #2a3b4c;
    --result-border: #1f2c38;
    
    /* Шапка в темной теме */
    --header-bg: #1a1a1a;
    --header-text: #e0e0e0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background-color: var(--bg-color); 
    color: var(--text-color); 
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

header { 
    background-color: var(--header-bg); 
    color: var(--header-text); 
    padding: 1rem 0; 
    box-shadow: 0 2px 4px rgba(0,0,0,0.1); 
    transition: background-color 0.3s ease, color 0.3s ease;
}
.header-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 15px; }
.logo { color: var(--header-text); text-decoration: none; font-size: 1.5rem; font-weight: bold; }
nav { display: flex; gap: 15px; align-items: center; }
nav a { color: var(--header-text); opacity: 0.8; text-decoration: none; font-size: 0.95rem; transition: opacity 0.2s; }
nav a:hover, nav a.active { opacity: 1; text-decoration: underline; }

/* Кнопка переключения темы (исправили background-color для совместимости с transition) */
.theme-toggle {
    background-color: rgba(255,255,255,0.2); 
    border: none; 
    color: var(--header-text);
    padding: 5px 10px; 
    border-radius: 4px; 
    cursor: pointer; 
    font-size: 0.9rem; 
    transition: background-color 0.2s ease, color 0.2s ease;
}
.theme-toggle:hover { 
    background-color: rgba(255,255,255,0.3); 
}

.breadcrumbs { margin: 15px 0; font-size: 0.85rem; color: var(--text-muted); }
.breadcrumbs a { color: var(--primary-color); text-decoration: none; }

main { padding: 1rem 0 3rem; }
h1, h2, h3 { color: var(--text-color); margin-bottom: 1rem; }
.subtitle { color: var(--text-muted); margin-bottom: 2rem; }

.ad-slot {
    
    margin: 1.5rem 0; 
}
.ad-top { min-height: 90px; } 
.ad-bottom { min-height: 250px; }

.calc-layout { display: grid; grid-template-columns: 1fr; gap: 2rem; margin-bottom: 2rem; }
@media (min-width: 768px) { .calc-layout { grid-template-columns: 1fr 1fr; } }

.card { 
    background-color: var(--card-bg); 
    padding: 1.5rem; 
    border-radius: var(--border-radius); 
    border: 1px solid var(--border-color); 
    transition: background-color 0.3s ease, border-color 0.3s ease; 
}

.form-group { margin-bottom: 1.2rem; }
.form-group label { display: block; font-weight: 600; margin-bottom: 0.4rem; font-size: 0.95rem; }
.form-group input {
    width: 100%; padding: 0.6rem; background-color: var(--input-bg); color: var(--text-color);
    border: 1px solid var(--border-color); border-radius: 4px; font-size: 1rem; 
    transition: border-color 0.2s ease, background-color 0.3s ease, color 0.3s ease;
}
.form-group input:focus { outline: none; border-color: var(--primary-color); }

button.btn-calc {
    width: 100%; background-color: var(--primary-color); color: white; border: none;
    padding: 0.8rem; font-size: 1.1rem; border-radius: 4px; cursor: pointer; font-weight: bold;
    transition: background-color 0.2s ease;
}
button.btn-calc:hover { background-color: var(--primary-hover); }

.result-box { 
    background-color: var(--result-bg); 
    border: 1px solid var(--result-border); 
    border-radius: var(--border-radius); 
    padding: 1.5rem; 
    text-align: center; 
    margin-bottom: 1rem; 
    transition: background-color 0.3s ease, border-color 0.3s ease;
}
.result-value { font-size: 2rem; font-weight: bold; color: var(--primary-color); margin: 0.5rem 0; }
.result-item { 
    display: flex; justify-content: space-between; margin-bottom: 0.5rem; font-size: 0.95rem; 
    border-bottom: 1px dashed var(--border-color); padding-bottom: 0.3rem;
    transition: border-color 0.3s ease;
}

/* График и таблица */
.chart-container { position: relative; height: 300px; width: 100%; margin-top: 2rem; }
.table-container { margin-top: 2rem; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; text-align: left; font-size: 0.9rem; }
th, td { padding: 10px; border-bottom: 1px solid var(--border-color); transition: border-color 0.3s ease; }
th { background-color: var(--input-bg); font-weight: bold; color: var(--text-muted); transition: background-color 0.3s ease, color 0.3s ease; }

/* SEO Контент */
.seo-content { 
    margin-top: 3rem; 
    background-color: var(--card-bg); 
    padding: 2rem; 
    border-radius: var(--border-radius); 
    border: 1px solid var(--border-color); 
    transition: background-color 0.3s ease, border-color 0.3s ease;
}
.seo-content p, .seo-content li { margin-bottom: 1rem; color: var(--text-color); }
.faq-item { margin-bottom: 1.5rem; }
.faq-item h3 { margin-bottom: 0.5rem; font-size: 1.1rem; color: var(--primary-color); }

footer { background-color: #1a1a1a; color: #ccc; text-align: center; padding: 2rem 0; margin-top: 2rem; }
footer a { color: #fff; }