/**
 * Design System - Sistem Bimbingan TA
 * Comprehensive design tokens and layout system
 * Version: 2.0.0
 */

/* ========================================
   1. DESIGN TOKENS (CSS Variables)
   ======================================== */

:root {
    /* Color Palette - Primary */
    --color-primary: #0665d0;
    --color-primary-dark: #0550a8;
    --color-primary-light: #3b82f6;
    --color-primary-lighter: #93c5fd;
    --color-primary-lightest: #dbeafe;

    /* Color Palette - Semantic */
    --color-success: #6f9c40;
    --color-success-dark: #5a7d33;
    --color-success-light: #8bb85a;
    --color-info: #3c90df;
    --color-info-dark: #2e72b0;
    --color-info-light: #5ba3e8;
    --color-warning: #e69f17;
    --color-warning-dark: #b87f12;
    --color-warning-light: #f0b84a;
    --color-danger: #e04f1a;
    --color-danger-dark: #b33e15;
    --color-danger-light: #e8663d;
    --color-secondary: #6c757d;
    --color-secondary-dark: #5a6268;
    --color-secondary-light: #868e96;

    /* Color Palette - Neutral */
    --color-white: #ffffff;
    --color-gray-50: #f8f9fa;
    --color-gray-100: #f1f3f5;
    --color-gray-200: #e9ecef;
    --color-gray-300: #dee2e6;
    --color-gray-400: #ced4da;
    --color-gray-500: #adb5bd;
    --color-gray-600: #6c757d;
    --color-gray-700: #495057;
    --color-gray-800: #343a40;
    --color-gray-900: #212529;
    --color-black: #000000;

    /* Background Colors */
    --bg-primary: var(--color-white);
    --bg-secondary: var(--color-gray-50);
    --bg-tertiary: var(--color-gray-100);
    --bg-sidebar: var(--color-gray-800);
    --bg-sidebar-header: var(--color-gray-900);
    --bg-header: var(--color-white);

    /* Text Colors */
    --text-primary: var(--color-gray-900);
    --text-secondary: var(--color-gray-700);
    --text-tertiary: var(--color-gray-600);
    --text-muted: var(--color-gray-500);
    --text-inverse: var(--color-white);
    --text-sidebar: rgba(255, 255, 255, 0.8);
    --text-sidebar-active: var(--color-white);

    /* Border Colors */
    --border-color: var(--color-gray-300);
    --border-color-light: var(--color-gray-200);
    --border-color-dark: var(--color-gray-400);

    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.18);
    --shadow-2xl: 0 16px 32px rgba(0, 0, 0, 0.2);

    /* Spacing Scale */
    --spacing-xs: 0.25rem; /* 4px */
    --spacing-sm: 0.5rem; /* 8px */
    --spacing-md: 1rem; /* 16px */
    --spacing-lg: 1.5rem; /* 24px */
    --spacing-xl: 2rem; /* 32px */
    --spacing-2xl: 3rem; /* 48px */
    --spacing-3xl: 4rem; /* 64px */

    /* Border Radius */
    --radius-xs: 0.25rem; /* 4px */
    --radius-sm: 0.375rem; /* 6px */
    --radius-md: 0.5rem; /* 8px */
    --radius-lg: 0.75rem; /* 12px */
    --radius-xl: 1rem; /* 16px */
    --radius-full: 9999px;

    /* Typography */
    --font-family-base: system-ui, -apple-system, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
    --font-family-mono: "Courier New", Courier, monospace;

    --font-size-xs: 0.75rem; /* 12px */
    --font-size-sm: 0.875rem; /* 14px */
    --font-size-base: 1rem; /* 16px */
    --font-size-lg: 1.125rem; /* 18px */
    --font-size-xl: 1.25rem; /* 20px */
    --font-size-2xl: 1.5rem; /* 24px */
    --font-size-3xl: 1.875rem; /* 30px */
    --font-size-4xl: 2.25rem; /* 36px */

    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;

    /* Layout */
    --sidebar-width: 250px;
    --header-height: 60px;
    --footer-height: auto;
    --content-max-width: 1400px;
    --content-padding: var(--spacing-lg);

    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 9999;
}

/* ========================================
   2. GLOBAL RESET & BASE STYLES
   ======================================== */

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

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

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    overflow-x: hidden;
    min-height: 100vh;
}

/* ========================================
   3. LAYOUT SYSTEM
   ======================================== */

/* Page Container */
#page-container {
    display: flex;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    width: 100%;
    max-width: 100%;
    background-color: var(--bg-secondary);
}

/* Sidebar */
#sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-sidebar);
    color: var(--text-sidebar);
    flex-shrink: 0;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
    left: 0;
    top: 0;
    z-index: var(--z-fixed);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-md);
}

#sidebar.sidebar-hidden {
    transform: translateX(-100%);
}

/* Sidebar Header */
.bg-header-dark {
    background-color: var(--bg-sidebar-header);
    padding: 0;
}

.bg-header-dark .content-header {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: var(--spacing-md);
    min-height: var(--header-height);
}

.bg-header-dark a,
.sidebar-logo {
    color: var(--text-inverse) !important;
    text-decoration: none;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-lg);
}

.sidebar-actions {
    display: flex;
    flex-direction: row;
    gap: var(--spacing-sm);
    align-items: center;
}

/* Sidebar Actions */
.btn-sidebar-action {
    background: transparent !important;
    border: none !important;
    color: var(--text-inverse) !important;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
    cursor: pointer;
}

.btn-sidebar-action:hover {
    background: rgba(255, 255, 255, 0.1) !important;
    color: var(--text-inverse) !important;
}

.btn-sidebar-action i {
    color: var(--text-inverse) !important;
}

/* Sidebar Navigation */
.js-sidebar-scroll {
    height: calc(100vh - var(--header-height));
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.content-side {
    padding: var(--spacing-md) 0;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.nav-main {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-main-item {
    margin: 0;
}

.nav-main-link {
    display: flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-md);
    color: var(--text-sidebar);
    text-decoration: none;
    transition: all var(--transition-base);
    border-left: 3px solid transparent;
}

.nav-main-link:hover {
    color: var(--text-sidebar-active);
    background: rgba(255, 255, 255, 0.1);
}

.nav-main-link.active {
    color: var(--text-sidebar-active);
    background: rgba(255, 255, 255, 0.15);
    border-left-color: var(--color-primary);
}

.nav-main-link-icon {
    width: 20px;
    margin-right: var(--spacing-md);
    text-align: center;
    flex-shrink: 0;
}

.nav-main-link-name {
    flex-grow: 1;
}

/* Sidebar Footer Menu */
.content-side > .nav-main:last-child {
    margin-top: auto;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-sm);
}

.content-side > .nav-main:last-child .nav-main-link {
    color: rgba(255, 255, 255, 0.7);
}

.content-side > .nav-main:last-child .nav-main-link:hover {
    color: var(--text-sidebar-active);
    background: rgba(255, 255, 255, 0.1);
}

/* Page Header */
#page-header {
    position: fixed;
    top: 0;
    left: var(--sidebar-width);
    right: 0;
    background: var(--bg-header);
    border-bottom: 1px solid var(--border-color);
    padding: 0;
    z-index: var(--z-fixed);
    height: var(--header-height);
    min-height: var(--header-height);
    max-height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: left var(--transition-base), width var(--transition-base);
    overflow-x: hidden;
    overflow-y: visible;
    width: calc(100% - var(--sidebar-width));
    max-width: calc(100% - var(--sidebar-width));
    box-shadow: var(--shadow-xs);
}

#page-header.sidebar-hidden {
    left: 0;
    width: 100%;
    max-width: 100%;
}

#page-header .content-header {
    width: 100%;
    height: var(--header-height);
    max-height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    overflow: visible;
    box-sizing: border-box;
    flex-wrap: nowrap;
}

/* Header Actions */
.space-x-1 {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    flex-shrink: 0;
    overflow: visible;
}

.btn-alt-secondary {
    color: var(--text-tertiary);
    background-color: transparent;
    border-color: transparent;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-alt-secondary:hover {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

/* Main Container */
#main-container {
    margin-top: var(--header-height);
    margin-left: 120px;
    margin-right: auto;
    flex-grow: 1;
    padding: 0;
    background: var(--bg-secondary);
    min-height: calc(100vh - var(--header-height));
    overflow-x: hidden;
    width: calc(100% - var(--sidebar-width));
    max-width: var(--content-max-width);
    transition: margin-left var(--transition-base), width var(--transition-base),
        max-width var(--transition-base);
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    position: relative;
}

#main-container.sidebar-hidden {
    margin-left: auto;
    margin-right: auto;
    width: 100%;
    max-width: var(--content-max-width);
}

#main-container .content {
    padding: var(--spacing-lg) 0;
    overflow-x: hidden;
    max-width: 100%;
    box-sizing: border-box;
    display: block;
    width: 100%;
}

/* Content Wrapper */
#main-container .content .content-wrapper,
.content-wrapper {
    max-width: 1200px;
    margin-left: auto !important;
    margin-right: auto !important;
    width: 100%;
    box-sizing: border-box;
    padding: 0 var(--spacing-lg);
    display: block;
    position: relative;
}

/* Page Footer */
#page-footer {
    background: var(--bg-secondary);
    padding: var(--spacing-md) var(--spacing-xl);
    border-top: 1px solid var(--border-color);
    margin-left: var(--sidebar-width);
    transition: margin-left var(--transition-base);
    overflow-x: hidden;
    width: calc(100% - var(--sidebar-width));
    max-width: calc(100% - var(--sidebar-width));
    box-sizing: border-box;
}

#page-footer.sidebar-hidden {
    margin-left: 0;
    width: 100%;
    max-width: 100%;
}

#page-footer .content {
    padding: 0;
}

#page-footer .row {
    margin: 0;
}

/* ========================================
   4. DROPDOWN SYSTEM
   ======================================== */

.dropdown {
    position: relative;
    overflow: visible;
    max-height: none;
    height: auto;
}

.dropdown-menu {
    position: absolute !important;
    top: calc(100% + 5px) !important;
    right: 0 !important;
    left: auto !important;
    z-index: var(--z-dropdown) !important;
    transform: none !important;
    margin-top: 0;
    overflow: visible;
    display: none;
    min-width: 12rem;
    padding: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    text-align: left;
    list-style: none;
    background-color: var(--bg-primary);
    background-clip: padding-box;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
}

.dropdown-menu.show {
    display: block;
}

.dropdown-menu-end {
    right: 0;
    left: auto;
}

.dropdown-toggle::after {
    display: inline-block;
    margin-left: 0.255em;
    vertical-align: 0.255em;
    content: "";
    border-top: 0.3em solid;
    border-right: 0.3em solid transparent;
    border-bottom: 0;
    border-left: 0.3em solid transparent;
}

.dropdown-item {
    display: block;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    clear: both;
    font-weight: var(--font-weight-normal);
    color: var(--text-primary);
    text-align: inherit;
    text-decoration: none;
    white-space: nowrap;
    background-color: transparent;
    border: 0;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
}

.dropdown-item:hover {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

.dropdown-divider {
    height: 0;
    margin: var(--spacing-xs) 0;
    overflow: hidden;
    border-top: 1px solid var(--border-color);
}

/* ========================================
   5. RESPONSIVE BREAKPOINTS
   ======================================== */

/* Tablet and below */
@media (max-width: 991px) {
    #sidebar {
        transform: translateX(-100%);
    }

    #sidebar.show {
        transform: translateX(0);
    }

    #main-container {
        margin-left: 0 !important;
        width: 100% !important;
        max-width: 100% !important;
    }

    #page-header {
        left: 0 !important;
        width: 100% !important;
    }

    #page-footer {
        margin-left: 0 !important;
        width: 100% !important;
    }

    .content-wrapper {
        max-width: 100%;
        padding: 0 var(--spacing-md);
    }

    #main-container .content {
        padding: var(--spacing-md) 0;
    }
}

/* Mobile */
@media (max-width: 576px) {
    :root {
        --content-padding: var(--spacing-md);
    }

    .content-wrapper {
        padding: 0 var(--spacing-sm);
    }

    #page-footer {
        padding: var(--spacing-md) var(--spacing-md);
    }

    body {
        font-size: var(--font-size-sm);
    }
}

/* Large screens */
@media (min-width: 1400px) {
    .content-wrapper {
        max-width: var(--content-max-width);
    }
}

/* ========================================
   6. UTILITY CLASSES
   ======================================== */

/* Text utilities */
.text-muted {
    color: var(--text-muted);
}

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

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

/* Background utilities */
.bg-body-light {
    background-color: var(--bg-secondary) !important;
}

.bg-primary-dark {
    background-color: var(--color-primary-dark) !important;
}

/* Spacing utilities */
.items-push {
    margin: 0 calc(-1 * var(--spacing-md));
}

.items-push > * {
    padding: 0 var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

/* Badge */
.badge {
    display: inline-block;
    padding: 0.35em 0.65em;
    font-size: 0.75em;
    font-weight: var(--font-weight-bold);
    line-height: 1;
    color: var(--text-inverse);
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: var(--radius-sm);
}

.bg-primary {
    background-color: var(--color-primary) !important;
}

/* Card static */
.card-static {
    position: relative;
}

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

/* Alert enhancements */
.alert-enhanced {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
}

.alert-enhanced-danger {
    color: #842029;
    background-color: #f8d7da;
    border-color: #f5c2c7;
}

.alert-enhanced-info {
    color: #055160;
    background-color: #cff4fc;
    border-color: #b6effb;
}

.alert-enhanced-warning {
    color: #664d03;
    background-color: #fff3cd;
    border-color: #ffecb5;
}

/* ========================================
   7. ACCESSIBILITY
   ======================================== */

/* Focus visible */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* 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: 0;
}

/* ========================================
   8. ANIMATIONS
   ======================================== */

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

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutRight {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}