/* ===== DESIGN SYSTEM APPLE ===== */

:root {
    /* Colors */
    --primary: #0071E3;
    --primary-hover: #0077ED;
    --success: #34C759;
    --warning: #FF9500;
    --danger: #FF3B30;
    --secondary: #5E5CE6;
    
    /* Grays */
    --gray-50: #FAFAFA;
    --gray-100: #F5F5F7;
    --gray-200: #E5E5EA;
    --gray-300: #D2D2D7;
    --gray-400: #C7C7CC;
    --gray-500: #A2A2A6;
    --gray-600: #8E8E93;
    --gray-700: #72767F;
    --gray-800: #424245;
    --gray-900: #1D1D1F;
    --gray-950: #0A0A0A;
    
    /* Dark Mode */
    --dark-bg: #000000;
    --dark-bg-secondary: #1C1C1E;
    --dark-bg-tertiary: #2C2C2E;
    --dark-text: #F5F5F7;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
    --transition-base: 250ms cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 350ms cubic-bezier(0.16, 1, 0.3, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
    background-color: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== TYPOGRAPHY ===== */

h1 {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1.2;
}

h2 {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.3px;
    line-height: 1.2;
}

h3 {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -0.2px;
    line-height: 1.3;
}

h4 {
    font-size: 16px;
    font-weight: 600;
    line-height: 1.4;
}

p {
    font-size: 16px;
    color: var(--gray-700);
    line-height: 1.6;
}

.text-sm {
    font-size: 14px;
    color: var(--gray-600);
}

.text-xs {
    font-size: 12px;
    color: var(--gray-500);
}

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

button, .btn {
    font-family: inherit;
    font-size: 16px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-lg);
    padding: 10px 24px;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

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

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-900);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--gray-200);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

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

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

.btn-success:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

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

.btn-danger:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    color: var(--primary);
    padding: 8px 16px;
}

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

button:disabled, .btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ===== INPUTS ===== */

input, textarea, select {
    font-family: inherit;
    font-size: 16px;
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    background: white;
    color: var(--gray-900);
    transition: all var(--transition-fast);
    outline: none;
}

input:focus, textarea:focus, select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.1);
    background: white;
}

input::placeholder {
    color: var(--gray-500);
}

input[type="email"], input[type="text"], input[type="password"], input[type="tel"], input[type="number"] {
    transition: all var(--transition-fast);
}

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

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

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

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    font-size: 14px;
    color: var(--gray-900);
}

.required {
    color: var(--danger);
    margin-left: 2px;
}

.form-hint {
    display: block;
    margin-top: 4px;
    font-size: 12px;
    color: var(--gray-600);
}

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

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

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

.card {
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-100);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-100);
}

.card-title {
    margin: 0;
    font-size: 20px;
    font-weight: 600;
}

.card-body {
    padding: 0;
}

.card-footer {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-100);
}

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

.alert {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    font-size: 14px;
    animation: slideIn 0.3s var(--transition-fast);
}

.alert.success {
    background: rgba(52, 199, 89, 0.1);
    color: #0B6623;
    border: 1px solid rgba(52, 199, 89, 0.2);
}

.alert.error {
    background: rgba(255, 59, 48, 0.1);
    color: #8B0000;
    border: 1px solid rgba(255, 59, 48, 0.2);
}

.alert.warning {
    background: rgba(255, 149, 0, 0.1);
    color: #803000;
    border: 1px solid rgba(255, 149, 0, 0.2);
}

.alert.info {
    background: rgba(0, 113, 227, 0.1);
    color: #003D82;
    border: 1px solid rgba(0, 113, 227, 0.2);
}

.alert i {
    font-size: 18px;
    flex-shrink: 0;
    margin-top: 2px;
}

/* ===== BADGES ===== */

.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 500;
    background: var(--gray-100);
    color: var(--gray-900);
}

.badge.primary {
    background: rgba(0, 113, 227, 0.1);
    color: #003D82;
}

.badge.success {
    background: rgba(52, 199, 89, 0.1);
    color: #0B6623;
}

.badge.warning {
    background: rgba(255, 149, 0, 0.1);
    color: #803000;
}

.badge.danger {
    background: rgba(255, 59, 48, 0.1);
    color: #8B0000;
}

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

.table-wrapper {
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--gray-100);
    box-shadow: var(--shadow-sm);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

thead {
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-100);
}

th {
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 13px;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

td {
    padding: 16px;
    border-bottom: 1px solid var(--gray-100);
    color: var(--gray-900);
}

tbody tr {
    transition: all var(--transition-fast);
}

tbody tr:hover {
    background: var(--gray-50);
}

tbody tr:last-child td {
    border-bottom: none;
}

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

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s var(--transition-fast);
}

.modal-dialog {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s var(--transition-fast);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-100);
}

.modal-header h3 {
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    color: var(--gray-400);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--gray-100);
    justify-content: flex-end;
}

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

.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.flex {
    display: flex;
    gap: var(--spacing-md);
}

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

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== NAVBAR ===== */

.navbar {
    background: white;
    border-bottom: 1px solid var(--gray-100);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

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

.navbar-brand {
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.navbar-menu {
    display: flex;
    gap: var(--spacing-xl);
    list-style: none;
}

.navbar-menu a {
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: color var(--transition-fast);
    padding: 8px 0;
    border-bottom: 2px solid transparent;
}

.navbar-menu a:hover {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* ===== SIDEBAR ===== */

.sidebar {
    background: white;
    border-right: 1px solid var(--gray-100);
    padding: var(--spacing-lg);
    height: 100vh;
    overflow-y: auto;
}

.sidebar-menu {
    list-style: none;
}

.sidebar-menu li {
    margin-bottom: var(--spacing-sm);
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 12px var(--spacing-md);
    color: var(--gray-700);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-weight: 500;
    font-size: 14px;
}

.sidebar-menu a:hover {
    background: var(--gray-50);
    color: var(--primary);
}

.sidebar-menu a.active {
    background: rgba(0, 113, 227, 0.1);
    color: var(--primary);
}

/* ===== ANIMATIONS ===== */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

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

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

.text-muted {
    color: var(--gray-500);
}

.text-danger {
    color: var(--danger);
}

.text-success {
    color: var(--success);
}

.text-primary {
    color: var(--primary);
}

.mt-0 { margin-top: 0; }
.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.p-0 { padding: 0; }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: var(--radius-full); }

.hidden { display: none !important; }

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@media (max-width: 768px) {
    h1 {
        font-size: 28px;
    }
    
    h2 {
        font-size: 22px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .navbar-menu {
        gap: var(--spacing-lg);
    }
}