/**
 * Kevin LifeOS Base CSS Framework
 * Based on digitec.ch design language
 * Version: 1.0.0
 */

/* ========================================
   CSS VARIABLES
   ======================================== */

:root {
    /* Brand Colors */
    --color-primary: #e60021;
    --color-primary-hover: #cc001d;
    --color-secondary: #00559d;
    --color-secondary-hover: #004480;
    --color-accent: #ffc32d;

    /* Semantic Colors */
    --color-success: #19a33c;
    --color-success-bg: #e8f5e9;
    --color-warning: #ff8000;
    --color-warning-bg: #fff3e0;
    --color-error: #e60021;
    --color-error-bg: #ffebee;
    --color-info: #00559d;
    --color-info-bg: #e3f2fd;

    /* Neutral Colors */
    --color-bg: #ffffff;
    --color-surface: #f5f5f5;
    --color-surface-hover: #ebebeb;
    --color-border: #e0e0e0;
    --color-text: #1f1f1f;
    --color-text-muted: #666666;

    /* Spacing */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --space-8: 48px;

    /* Typography */
    --font-family: 'Roboto', Arial, sans-serif;
    --font-family-mono: Monaco, 'Lucida Console', Consolas, monospace;

    /* Border Radius */
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 8px;
    --radius-full: 50%;

    /* Shadows */
    --shadow-subtle: 0 0 2px rgba(0,0,0,0.16), 0 2px 4px rgba(0,0,0,0.08);
    --shadow-medium: 0 0 2px rgba(0,0,0,0.16), 0 4px 8px rgba(0,0,0,0.08);
    --shadow-prominent: 0 0 2px rgba(0,0,0,0.16), 0 8px 16px rgba(0,0,0,0.08);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-primary: #ff5857;
    --color-primary-hover: #ff7a79;
    --color-secondary: #72c7f9;
    --color-secondary-hover: #9ad5fa;

    --color-success: #84d160;
    --color-success-bg: #1a3d1a;
    --color-warning: #ffc32d;
    --color-warning-bg: #3d3018;
    --color-error: #ff5857;
    --color-error-bg: #3d1a1a;
    --color-info: #72c7f9;
    --color-info-bg: #1a2d3d;

    --color-bg: #1f1f1f;
    --color-surface: #2a2a2a;
    --color-surface-hover: #353535;
    --color-border: #404040;
    --color-text: #ffffff;
    --color-text-muted: #a0a0a0;
}

/* ========================================
   RESET & BASE
   ======================================== */

*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
}

h1, h2, h3, h4, h5, h6 {
    margin: 0 0 var(--space-4);
    font-weight: 600;
    line-height: 1.25;
}

h1 { font-size: 32px; }
h2 { font-size: 24px; }
h3 { font-size: 20px; }
h4 { font-size: 16px; }
h5 { font-size: 14px; }
h6 { font-size: 12px; }

p {
    margin: 0 0 var(--space-5);
}

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

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

code, pre {
    font-family: var(--font-family-mono);
    font-size: 13px;
}

code {
    padding: 2px 6px;
    background: var(--color-surface);
    border-radius: var(--radius-sm);
}

pre {
    padding: var(--space-4);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    overflow-x: auto;
}

pre code {
    padding: 0;
    background: none;
}

/* ========================================
   LAYOUT
   ======================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-5);
}

.container-sm {
    max-width: 800px;
}

.container-lg {
    max-width: 1400px;
}

.container-fluid {
    max-width: 100%;
    padding: 0 var(--space-5);
}

/* Grid */
.grid {
    display: grid;
    gap: var(--space-4);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* Flexbox Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }

/* ========================================
   NAVIGATION
   ======================================== */

.nav-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-8);
    height: 56px;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-primary);
}

.nav-links {
    display: flex;
    gap: var(--space-5);
}

.nav-link {
    font-size: 14px;
    font-weight: 400;
    color: var(--color-text);
    text-decoration: none;
    padding: var(--space-2) 0;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-normal);
}

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

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

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    line-height: 1;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

.btn:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Primary Button */
.btn-primary {
    background: var(--color-primary);
    color: #ffffff;
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
}

/* Secondary Button */
.btn-secondary {
    background: transparent;
    color: var(--color-secondary);
    border: 2px solid var(--color-secondary);
    padding: calc(var(--space-3) - 2px) calc(var(--space-5) - 2px);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-secondary);
    color: #ffffff;
}

/* Ghost Button */
.btn-ghost {
    background: transparent;
    color: var(--color-text);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--color-surface);
}

/* Danger Button */
.btn-danger {
    background: var(--color-error);
    color: #ffffff;
}

.btn-danger:hover:not(:disabled) {
    background: #cc001d;
}

/* Button Sizes */
.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: 12px;
}

.btn-lg {
    padding: var(--space-4) var(--space-6);
    font-size: 16px;
}

/* Icon Button */
.btn-icon {
    padding: var(--space-2);
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.btn-icon:hover {
    background: var(--color-surface);
    color: var(--color-text);
}

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

.card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-subtle);
}

.card-header {
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-border);
    font-size: 16px;
    font-weight: 600;
}

.card-body {
    padding: var(--space-4);
}

.card-footer {
    padding: var(--space-4);
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
}

/* Stat Card */
.stat-card {
    padding: var(--space-4);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.stat-card-label {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-bottom: var(--space-1);
}

.stat-card-value {
    font-size: 28px;
    font-weight: 600;
    color: var(--color-text);
}

.stat-card-value.primary {
    color: var(--color-primary);
}

.stat-card-value.success {
    color: var(--color-success);
}

/* ========================================
   FORMS
   ======================================== */

.form-group {
    margin-bottom: var(--space-4);
}

.form-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: var(--space-1);
    color: var(--color-text);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-3);
    font-family: inherit;
    font-size: 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);
    color: var(--color-text);
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 3px rgba(0, 85, 157, 0.15);
}

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

.form-input.error,
.form-select.error,
.form-textarea.error {
    border-color: var(--color-error);
}

.form-input.error:focus,
.form-select.error:focus,
.form-textarea.error:focus {
    box-shadow: 0 0 0 3px rgba(230, 0, 33, 0.15);
}

.form-hint {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

.form-error {
    font-size: 12px;
    color: var(--color-error);
    margin-top: var(--space-1);
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

/* Checkbox & Radio */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
    width: 18px;
    height: 18px;
    margin: 0;
    accent-color: var(--color-primary);
}

/* ========================================
   TABLES
   ======================================== */

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.table th,
.table td {
    text-align: left;
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border);
}

.table th {
    font-weight: 600;
    background: var(--color-surface);
    border-bottom-width: 2px;
}

.table tbody tr:hover {
    background: var(--color-surface);
}

.table-striped tbody tr:nth-child(even) {
    background: var(--color-surface);
}

.table-striped tbody tr:nth-child(even):hover {
    background: var(--color-surface-hover);
}

/* Responsive Table */
.table-responsive {
    overflow-x: auto;
}

/* ========================================
   BADGES & TAGS
   ======================================== */

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-2);
    font-size: 11px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-success {
    background: var(--color-success-bg);
    color: var(--color-success);
}

.badge-warning {
    background: var(--color-warning-bg);
    color: var(--color-warning);
}

.badge-error {
    background: var(--color-error-bg);
    color: var(--color-error);
}

.badge-info {
    background: var(--color-info-bg);
    color: var(--color-info);
}

.badge-neutral {
    background: var(--color-surface);
    color: var(--color-text-muted);
}

/* Tag (larger, pill-shaped) */
.tag {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    font-size: 12px;
    border-radius: 999px;
    background: var(--color-surface);
    color: var(--color-text);
}

/* ========================================
   PROGRESS
   ======================================== */

.progress {
    height: 8px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--color-primary);
    border-radius: var(--radius-md);
    transition: width var(--transition-slow);
}

.progress-bar.success { background: var(--color-success); }
.progress-bar.warning { background: var(--color-warning); }
.progress-bar.error { background: var(--color-error); }
.progress-bar.info { background: var(--color-secondary); }

/* ========================================
   ALERTS
   ======================================== */

.alert {
    padding: var(--space-4);
    border-radius: var(--radius-md);
    border-left: 4px solid;
    margin-bottom: var(--space-4);
}

.alert-success {
    background: var(--color-success-bg);
    border-color: var(--color-success);
    color: var(--color-success);
}

.alert-warning {
    background: var(--color-warning-bg);
    border-color: var(--color-warning);
    color: var(--color-warning);
}

.alert-error {
    background: var(--color-error-bg);
    border-color: var(--color-error);
    color: var(--color-error);
}

.alert-info {
    background: var(--color-info-bg);
    border-color: var(--color-info);
    color: var(--color-info);
}

/* ========================================
   MODALS
   ======================================== */

.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-backdrop.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-prominent);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    transform: scale(0.95);
    transition: transform var(--transition-normal);
}

.modal-backdrop.active .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-border);
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
}

.modal-body {
    padding: var(--space-4);
    overflow-y: auto;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-2);
    padding: var(--space-4);
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
}

/* ========================================
   LOADING / SPINNER
   ======================================== */

.spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.spinner-sm {
    width: 16px;
    height: 16px;
}

.spinner-lg {
    width: 32px;
    height: 32px;
    border-width: 3px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

[data-theme="dark"] .loading-overlay {
    background: rgba(31, 31, 31, 0.8);
}

/* ========================================
   UTILITIES
   ======================================== */

/* Text */
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }
.text-muted { color: var(--color-text-muted); }

.text-sm { font-size: 12px; }
.text-lg { font-size: 16px; }
.text-xl { font-size: 20px; }

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

.font-normal { font-weight: 400; }
.font-semibold { font-weight: 600; }
.font-mono { font-family: var(--font-family-mono); }

/* Spacing */
.m-0 { margin: 0; }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }

.p-0 { padding: 0; }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }

/* Display */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

/* Width */
.w-full { width: 100%; }
.w-auto { width: auto; }

/* Position */
.relative { position: relative; }
.absolute { position: absolute; }

/* Borders */
.border { border: 1px solid var(--color-border); }
.border-t { border-top: 1px solid var(--color-border); }
.border-b { border-bottom: 1px solid var(--color-border); }
.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }

/* Background */
.bg-surface { background: var(--color-surface); }
.bg-primary { background: var(--color-primary); }

/* Shadows */
.shadow { box-shadow: var(--shadow-subtle); }
.shadow-md { box-shadow: var(--shadow-medium); }
.shadow-lg { box-shadow: var(--shadow-prominent); }

/* Truncate */
.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

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

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

:focus:not(:focus-visible) {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

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

/* ========================================
   PAGE LAYOUT HELPERS
   ======================================== */

.page {
    padding: var(--space-5) 0;
}

.page-header {
    margin-bottom: var(--space-5);
}

.page-title {
    font-size: 28px;
    font-weight: 600;
    margin: 0 0 var(--space-2);
}

.page-subtitle {
    font-size: 14px;
    color: var(--color-text-muted);
    margin: 0;
}

.section {
    margin-bottom: var(--space-6);
}

.section-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-3);
    border-bottom: 1px solid var(--color-border);
}