/**
 * Zeiterfassung - Mobile-First Responsive CSS
 * Vanilla CSS ohne Framework
 */

/* === Reset & Base === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --gco-primary: #1a1a2e;
    --gco-secondary: #16213e;
    --gco-accent: #0f3460;
    --gco-highlight: #533483;
    --gco-success: #28a745;
    --gco-warning: #ffc107;
    --gco-danger: #dc3545;
    --gco-light: #f8f9fa;
    --gco-dark: #212529;
    
    /* Mapped to GCO colors */
    --color-primary: var(--gco-highlight);
    --color-primary-dark: var(--gco-accent);
    --color-success: var(--gco-success);
    --color-success-dark: #1e7e34;
    --color-danger: var(--gco-danger);
    --color-danger-dark: #bd2130;
    --color-warning: var(--gco-warning);
    --color-secondary: #6b7280;
    --color-secondary-dark: #4b5563;
    
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-bg: #f9fafb;
    --color-white: #ffffff;
    --color-border: #e5e7eb;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    --radius: 8px;
    --radius-lg: 12px;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-text);
    background: linear-gradient(135deg, var(--gco-primary) 0%, var(--gco-secondary) 50%, var(--gco-accent) 100%);
    min-height: 100vh;
}

/* === Container === */
.container {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* === Header === */
.header {
    background: linear-gradient(135deg, var(--gco-highlight) 0%, var(--gco-accent) 100%);
    color: white;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-xl) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0.05) 50%, transparent 70%);
    animation: shimmer 4s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { transform: rotate(0deg); }
    50% { transform: rotate(180deg); }
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: white;
    margin-bottom: var(--spacing-xs);
    position: relative;
    z-index: 2;
}

.user-info {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.9);
    position: relative;
    z-index: 2;
}

.user-info strong {
    color: white;
    font-weight: 600;
}

/* === Navigation === */
.nav {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
    background: var(--color-white);
    padding: var(--spacing-xs);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.nav-link {
    flex: 1;
    text-align: center;
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    color: var(--color-text-light);
    font-weight: 500;
    font-size: 0.875rem;
    border-radius: var(--radius);
    transition: all 0.2s;
}

.nav-link:hover {
    background: var(--color-bg);
    color: var(--color-text);
}

.nav-link.active {
    background: var(--color-primary);
    color: var(--color-white);
}

/* === Tabs === */
.tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-border);
}

.tab {
    padding: var(--spacing-sm) var(--spacing-lg);
    text-decoration: none;
    color: var(--color-text-light);
    font-weight: 500;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s;
}

.tab:hover {
    color: var(--color-primary);
}

.tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* === Cards === */
.login-card,
.main-card,
.card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: var(--spacing-xl);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin-bottom: var(--spacing-lg);
}

.login-card,
.card {
    max-width: 100%;
    margin: auto;
}

.login-card h1,
.card h2 {
    font-size: 1.75rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xs);
    color: var(--gco-primary);
}

.card p {
    color: var(--color-text);
}

.subtitle {
    text-align: center;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

/* === Forms === */
.login-form,
.form {
    width: 100%;
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

@media (max-width: 640px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
    font-size: 0.875rem;
}

.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="text"],
.form-group input[type="tel"],
.form-group input[type="number"],
.form-group select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: all 0.2s;
    background-color: var(--color-white);
    font-family: 'Inter', sans-serif;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* === Section Headers === */
.section-header {
    color: var(--gco-accent);
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-border);
    font-size: 1.125rem;
    font-weight: 600;
}

.section-header:first-child {
    margin-top: 0;
}

/* === Buttons === */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    line-height: 1.5;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
}

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

.btn-success {
    background: var(--color-success);
    color: var(--color-white);
}

.btn-success:hover {
    background: var(--color-success-dark);
}

.btn-danger {
    background: var(--color-danger);
    color: var(--color-white);
}

.btn-danger:hover {
    background: var(--color-danger-dark);
}

.btn-secondary {
    background: var(--color-secondary);
    color: var(--color-white);
}

.btn-secondary:hover {
    background: var(--color-secondary-dark);
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

/* === Alerts === */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius);
    margin-bottom: var(--spacing-lg);
    font-size: 0.875rem;
    line-height: 1.5;
}

.alert-error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-success {
    background: #f0fdf4;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.alert-warning {
    background: #fffbeb;
    color: #92400e;
    border: 1px solid #fde68a;
}

/* Message boxes (aliases for alerts) */
.error-message {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
    padding: var(--spacing-md);
    border-radius: var(--radius);
    margin-bottom: var(--spacing-lg);
}

.success-message {
    background: #f0fdf4;
    color: #166534;
    border: 1px solid #bbf7d0;
    padding: var(--spacing-md);
    border-radius: var(--radius);
    margin-bottom: var(--spacing-lg);
}

/* === Status Cards === */
.status-card {
    text-align: center;
    padding: var(--spacing-xl);
}

.status-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.status-card h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.time-display {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

.status-running .status-icon {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* === View Toggle === */
.view-toggle {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
    background: var(--color-bg);
    padding: var(--spacing-xs);
    border-radius: var(--radius);
}

.toggle-btn {
    flex: 1;
    text-align: center;
    padding: var(--spacing-sm);
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    border-radius: var(--radius);
    transition: all 0.2s;
}

.toggle-btn:hover {
    background: var(--color-white);
}

.toggle-btn.active {
    background: var(--color-primary);
    color: var(--color-white);
}

/* === Date Navigation === */
.date-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    gap: var(--spacing-md);
}

.date-nav-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg);
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--radius);
    font-size: 0.875rem;
    white-space: nowrap;
    transition: all 0.2s;
}

.date-nav-btn:hover {
    background: var(--color-border);
}

.date-display {
    font-size: 1.25rem;
    font-weight: 600;
    text-align: center;
}

.today-btn-wrapper {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

/* === Summary Card === */
.summary-card {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.summary-card h3 {
    font-size: 1rem;
    font-weight: 500;
    opacity: 0.9;
    margin-bottom: var(--spacing-sm);
}

.total-hours {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.total-entries {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* === Records List === */
.records-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.record-item {
    background: var(--color-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}

.record-date {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.record-times {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
}

.time-separator {
    color: var(--color-text-light);
}

.record-duration {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
}

.no-records {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-light);
}

/* === Footer === */
.footer {
    margin-top: auto;
    padding: var(--spacing-lg) 0;
    text-align: center;
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.7);
}

.footer p {
    color: rgba(255, 255, 255, 0.7);
}

.footer a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius);
    transition: all 0.2s;
    display: inline-block;
    margin-top: var(--spacing-xs);
}

.footer a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

/* === Responsive === */
@media (min-width: 640px) {
    .container {
        padding: var(--spacing-xl);
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .nav-link {
        font-size: 1rem;
    }
    
    .date-nav-btn {
        font-size: 1rem;
    }
}

@media (min-width: 768px) {
    .login-card,
    .main-card {
        padding: var(--spacing-xl) calc(var(--spacing-xl) * 1.5);
    }
}