/* ============================================
   BASE.CSS - REFACTORED VERSION
   
   Zweck: Farben, Typografie, Buttons, Grund-Utilities, Variablen
   Änderungen:
   - Erweiterte CSS-Variablen
   - Redundante Variable entfernt (--color-muted)
   - Hardcoded Farben durch Variablen ersetzt
   - Alle Button-Varianten konsolidiert
   - Card als Basis-Klasse
   ============================================ */

/* ============================================
   CSS-VARIABLEN
   ============================================ */
:root {
    /* ===== FARBEN ===== */
    --color-bg: #0f172a;
    --color-bg-alt: #1e293b;
    --color-bg-card: #020617;
    
    --color-primary: #facc15;
    --color-primary-dark: #eab308;
    --color-primary-light: #fde68a;
    
    --color-text: #e5e7eb;
    --color-text-light: #f9fafb;
    --color-text-muted: #9ca3af;
    
    --color-border: #334155;
    
    /* ===== STATUSFARBEN ===== */
    --color-warning: #ffc107;
    --color-success: #28a745;
    --color-error: #dc2626;
    
    /* ===== ABSTÄNDE (Spacing Scale) ===== */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 0.75rem;
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;
    --spacing-xxl: 2.5rem;
    
    /* ===== RADIEN ===== */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* ===== SCHATTEN ===== */
    --shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.45);
    --shadow-md: 0 8px 20px rgba(15, 23, 42, 0.65);
    --shadow-lg: 0 12px 28px rgba(15, 23, 42, 0.75);
    --shadow-soft: 0 10px 25px rgba(0, 0, 0, 0.35);
    
    /* ===== TRANSITIONS ===== */
    --transition-fast: 150ms ease-out;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* ===== LAYOUT ===== */
    --container-max-width: 1200px;
    --header-height: 60px;
    
    /* ===== Z-INDEX SCALE ===== */
    --z-header: 1000;
    --z-modal: 2000;
    --z-tooltip: 3000;
}

/* ============================================
   GLOBALE STYLES
   ============================================ */
html {
    scroll-behavior: smooth;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: radial-gradient(circle at top, #1f2937 0, #020617 55%);
    color: var(--color-text);
    line-height: 1.5;
    margin: 0;
    padding: 0;
}

/* ============================================
   CONTAINER
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* ============================================
   TYPOGRAFIE
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text-light);
    margin: 0;
}

h1 {
    font-size: clamp(1.8rem, 3vw, 2.4rem);
}

h2 {
    font-size: clamp(1.4rem, 2.4vw, 2rem);
}

h3 {
    font-size: clamp(1.2rem, 2vw, 1.6rem);
}

p {
    font-size: 0.95rem;
    color: var(--color-text);
    margin: 0;
}

/* ============================================
   LINKS
   ============================================ */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

a:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ============================================
   BUTTONS
   ============================================ */

/* Basis-Button */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    padding: 0.6rem 1.2rem;
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    text-decoration: none;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

/* Primary Button */
.btn-primary {
    background: var(--color-primary);
    color: var(--color-bg-alt);
    box-shadow: var(--shadow-soft);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 14px 30px rgba(0, 0, 0, 0.45);
    color: var(--color-bg-alt);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-soft);
}

/* Secondary Button */
.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover {
    background: rgba(250, 204, 21, 0.12);
    color: var(--color-primary);
}

/* Outline Button (Alias für Secondary) */
.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background: rgba(250, 204, 21, 0.12);
    color: var(--color-primary);
}

/* Small Button */
.btn-small {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

/* Block Button */
.btn-block {
    display: flex;
    width: 100%;
}

/* Disabled Button */
.btn:disabled,
.btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* ============================================
   CARDS
   ============================================ */

/* Basis-Card */
.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    padding: 1.25rem 1.5rem;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ============================================
   FORMULARE
   ============================================ */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="url"],
textarea,
select {
    width: 100%;
    padding: 0.6rem 0.75rem;
    border-radius: 999px;
    border: 1px solid var(--color-border);
    background: var(--color-bg-card);
    color: var(--color-text);
    outline: none;
    font-size: 0.95rem;
    transition: border-color var(--transition-fast), 
                box-shadow var(--transition-fast),
                background var(--transition-fast);
}

textarea {
    border-radius: var(--radius-lg);
    min-height: 120px;
    resize: vertical;
}

input:focus,
textarea:focus,
select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 1px rgba(250, 204, 21, 0.4);
}

input::placeholder,
textarea::placeholder {
    color: var(--color-text-muted);
}

/* Form Group */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--color-text-light);
}

/* Error State */
input.error,
textarea.error,
select.error {
    border-color: var(--color-error);
}

.error-message {
    color: var(--color-error);
    font-size: 0.85rem;
    margin-top: var(--spacing-xs);
}

/* ============================================
   ALERTS
   ============================================ */
.alert {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    border: 1px solid transparent;
}

.alert-success {
    background: rgba(40, 167, 69, 0.2);
    border-color: var(--color-success);
    color: var(--color-success);
}

.alert-error {
    background: rgba(220, 38, 38, 0.2);
    border-color: var(--color-error);
    color: var(--color-error);
}

.alert-warning {
    background: rgba(255, 193, 7, 0.2);
    border-color: var(--color-warning);
    color: var(--color-warning);
}

/* ============================================
   UTILITY-KLASSEN
   ============================================ */

/* Text */
.text-muted {
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-left {
    text-align: left;
}

/* Margin Top */
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

/* Margin Bottom */
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

/* Margin All */
.m-0 { margin: 0; }
.m-1 { margin: var(--spacing-xs); }
.m-2 { margin: var(--spacing-sm); }
.m-3 { margin: var(--spacing-lg); }
.m-4 { margin: var(--spacing-xl); }

/* Padding */
.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-lg); }
.p-4 { padding: var(--spacing-xl); }

/* Display */
.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

/* Flex */
.flex-column { flex-direction: column; }
.flex-row { flex-direction: row; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

/* Gap */
.gap-1 { gap: var(--spacing-xs); }
.gap-2 { gap: var(--spacing-sm); }
.gap-3 { gap: var(--spacing-lg); }
.gap-4 { gap: var(--spacing-xl); }

/* ============================================
   RESPONSIVE UTILITIES
   ============================================ */
@media (max-width: 767px) {
    .container {
        padding: var(--spacing-md);
    }
    
    /* Hide on Mobile */
    .hide-mobile {
        display: none !important;
    }
}

@media (min-width: 768px) {
    /* Hide on Desktop */
    .hide-desktop {
        display: none !important;
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

/* Skip to Content Link */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-bg);
    padding: var(--spacing-sm) var(--spacing-lg);
    text-decoration: none;
    z-index: 9999;
}

.skip-to-content:focus {
    top: 0;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Prefers Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}