/* ============================================
   GLOBAL STYLES - BuHa OptiMax
   ============================================ */

/* CSS Custom Properties */
:root {
    --primary: #1a56db;
    --primary-dark: #1342a8;
    --primary-light: #e8effc;
    --secondary: #0f172a;
    --accent: #10b981;
    --accent-dark: #059669;
    --warning: #f59e0b;
    --danger: #ef4444;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-gray: #f1f5f9;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    /* Reifegrad Colors */
    --reifegrad-1: #94a3b8;
    --reifegrad-1-bg: #f1f5f9;
    --reifegrad-2: #3b82f6;
    --reifegrad-2-bg: #eff6ff;
    --reifegrad-3: #10b981;
    --reifegrad-3-bg: #ecfdf5;
    --reifegrad-4: #f59e0b;
    --reifegrad-4-bg: #fffbeb;
}

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-light);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    font-weight: 700;
    color: var(--text-primary);
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.375rem; }
h4 { font-size: 1.125rem; }

p {
    color: var(--text-secondary);
    line-height: 1.7;
}

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

a:hover {
    color: var(--primary-dark);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 14px rgba(26, 86, 219, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 86, 219, 0.4);
    color: white;
}

.btn-secondary {
    background: var(--bg-gray);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid transparent;
}

.btn-ghost:hover {
    color: var(--primary);
    background: var(--primary-light);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.05rem;
}

/* Navigation */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.nav-brand i {
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary);
    background: var(--primary-light);
}

.nav-link.btn-primary {
    color: white;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

.nav-link.btn-primary:hover {
    color: white;
    transform: translateY(-1px);
}

/* Footer */
.footer {
    background: var(--secondary);
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 30px;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    color: white;
    margin-bottom: 16px;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-col p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    line-height: 1.6;
}

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

.footer-col ul li {
    margin-bottom: 10px;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-col ul li a {
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: white;
}

.footer-col ul li i {
    color: var(--primary);
    width: 16px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.375rem; }
    h3 { font-size: 1.125rem; }

    .container {
        padding: 0 16px;
    }

    .nav-menu {
        gap: 12px;
    }

    .nav-link {
        font-size: 0.85rem;
        padding: 6px 12px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .nav-brand span {
        font-size: 1rem;
    }

    .nav-menu {
        gap: 8px;
    }

    .nav-link:first-child {
        display: none;
    }
}