/*
 * Latoll - Main Stylesheet
 * Zero dependencies, pure CSS with custom properties
 */

/* ============================================
   CSS CUSTOM PROPERTIES (Variables)
   ============================================ */
:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-50: #eff6ff;
    --color-primary-100: #dbeafe;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #3b82f6;
    --color-secondary: #64748b;
    --color-success: #10b981;
    --color-success-100: #d1fae5;
    --color-success-700: #047857;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-danger-100: #fee2e2;
    --color-danger-600: #dc2626;
    --color-info: #06b6d4;
    
    /* Neutrals */
    --color-white: #ffffff;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    
    /* Layout */
    --container-max: 1400px;
    --header-height: 64px;
    
    /* Borders */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-full: 9999px;
    --radius-xl: 0.75rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
}

/* ============================================
   RESET & BASE
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--color-gray-800);
    background-color: var(--color-gray-50);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

img {
    max-width: 100%;
    height: auto;
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.main {
    flex: 1;
    padding: var(--space-6) 0;
}

/* ============================================
   HEADER
   ============================================ */
.header {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-gray-900);
    letter-spacing: -0.025em;
}

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

/* Navigation */
.nav-desktop {
    display: none;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--space-1);
}

.nav-link {
    display: block;
    padding: var(--space-2) var(--space-3);
    color: var(--color-gray-600);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background-color: var(--color-gray-100);
}

/* Header Actions */
.header-actions {
    display: none;
    align-items: center;
    gap: var(--space-3);
}

.user-name {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-gray-600);
    transition: all var(--transition-fast);
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    padding: var(--space-4);
}

.mobile-menu.active {
    display: block;
}

.mobile-nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.mobile-nav-link {
    display: block;
    padding: var(--space-3);
    color: var(--color-gray-700);
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: var(--radius-md);
}

.mobile-nav-link:hover {
    background-color: var(--color-gray-100);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background-color: var(--color-white);
    border-top: 1px solid var(--color-gray-200);
    padding: var(--space-6) 0;
    margin-top: auto;
}

.footer-container {
    text-align: center;
    color: var(--color-gray-500);
    font-size: var(--font-size-sm);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.3);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Button Variants */
.btn-primary {
    color: var(--color-white);
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

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

.btn-secondary {
    color: var(--color-gray-700);
    background-color: var(--color-white);
    border-color: var(--color-gray-300);
}

.btn-secondary:hover {
    background-color: var(--color-gray-50);
    border-color: var(--color-gray-400);
    color: var(--color-gray-800);
}

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

.btn-danger:hover {
    background-color: #dc2626;
    border-color: #dc2626;
    color: var(--color-white);
}

/* Button Sizes */
.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
}

/* ============================================
   FORMS
   ============================================ */
.form-group {
    margin-bottom: var(--space-4);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-700);
}

.form-label-required::after {
    content: ' *';
    color: var(--color-danger);
}

.form-input,
.form-select,
.form-textarea {
    display: block;
    width: 100%;
    padding: var(--space-2) var(--space-3);
    font-family: inherit;
    font-size: var(--font-size-sm);
    line-height: 1.5;
    color: var(--color-gray-800);
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
    background-color: var(--color-gray-100);
    cursor: not-allowed;
}

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

.form-hint {
    margin-top: var(--space-1);
    font-size: var(--font-size-xs);
    color: var(--color-gray-500);
}

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

/* ============================================
   FLASH MESSAGES
   ============================================ */
.flash-message {
    position: relative;
    padding: var(--space-4);
    margin-bottom: var(--space-6);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
}

.flash-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.flash-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.flash-warning {
    background-color: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
}

.flash-info {
    background-color: #dbeafe;
    color: #1e40af;
    border: 1px solid #bfdbfe;
}

.flash-close {
    position: absolute;
    top: var(--space-2);
    right: var(--space-2);
    background: none;
    border: none;
    font-size: var(--font-size-lg);
    line-height: 1;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

.flash-close:hover {
    opacity: 1;
}

/* ============================================
   CARDS
   ============================================ */
.card {
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.card-header {
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--color-gray-200);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-gray-900);
}

.card-body {
    padding: var(--space-6);
}

/* ============================================
   PAGE HEADER
   ============================================ */
.page-header {
    margin-bottom: var(--space-8);
}

.page-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--space-2);
}

.page-description {
    font-size: var(--font-size-base);
    color: var(--color-gray-600);
}

/* ============================================
   RESPONSIVE BREAKPOINTS
   ============================================ */
@media (min-width: 768px) {
    .nav-desktop {
        display: block;
    }
    
    .header-actions {
        display: flex;
    }
    
    .menu-toggle {
        display: none;
    }
    
    .mobile-menu {
        display: none !important;
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--space-8);
    }
}