/* ==========================================================================
   KASN HUB - Core Architectural Stylesheet (Dynamic Theme Matrix)
   ========================================================================== */

/* ডার্ক থিম রুট কালার কোড */
:root, [data-theme="dark"] {
    --bg-main: #0a0f1d;
    --bg-surface: #0e172c;
    --bg-surface-hover: #16223f;
    --color-primary: #00f2fe;
    --color-secondary: #4facfe;
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --border-color: #1e293b;
    --success: #10b981;
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

/* লাইট থিম রুট ওভাররাইড */
[data-theme="light"] {
    --bg-main: #f4f6fa;
    --bg-surface: #ffffff;
    --bg-surface-hover: #f8fafc;
    --color-primary: #0284c7;
    --color-secondary: #0ea5e9;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #cbd5e1;
    --card-shadow: 0 4px 20px rgba(15, 23, 42, 0.08);
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-stack);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: inherit;
    text-decoration: none;
    transition: all 0.3s ease;
}

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

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 24px;
    font-weight: 800;
    letter-spacing: 1px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-muted);
    transition: color 0.3s ease;
}

.nav-link:hover, .nav-link.active {
    color: var(--color-primary);
}

.btn-portal {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary)) !important;
    color: #0a0f1d !important;
    padding: 8px 20px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 14px;
    box-shadow: 0 4px 15px rgba(0, 242, 254, 0.25);
    border: none;
    cursor: pointer;
    display: inline-block;
    text-align: center;
}

.btn-portal:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 242, 254, 0.4);
}

/* Main Core Layout area Container */
.main-content {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Typography elements */
h1 {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-main);
}

p {
    color: var(--text-muted);
    margin-bottom: 20px;
    font-size: 16px;
}

/* UI Hero Component View layout */
.hero-section {
    text-align: center;
    padding: 60px 0 80px 0;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-muted);
    margin-bottom: 35px;
}

/* Grids Layout modules */
.grid-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.ui-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.ui-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    background-color: var(--bg-surface-hover);
}

.card-icon {
    font-size: 32px;
    color: var(--color-primary);
    margin-bottom: 15px;
}

/* Functional Forms configuration styles */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-main);
}

.form-control {
    width: 100%;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 12px 16px;
    border-radius: 8px;
    font-family: inherit;
    font-size: 15px;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
}

.btn-submit {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
    color: #0a0f1d;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
}

/* Legal text block system layout */
.legal-container {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 40px;
    margin-top: 20px;
    box-shadow: var(--card-shadow);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* Structural Footer layout elements */
.site-footer {
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    padding: 40px 20px;
    margin-top: 60px;
    font-size: 14px;
    color: var(--text-muted);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-nav {
    display: flex;
    gap: 20px;
    list-style: none;
}

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

/* Responsive Breakpoints */
@media (max-width: 768px) {
    .header-container {
        flex-direction: row;
        flex-wrap: wrap;
        padding: 12px 15px;
    }
    .hero-title {
        font-size: 32px;
    }
    .hero-section {
        padding: 40px 0;
    }
    .footer-container {
        flex-direction: column;
        text-align: center;
    }
}