/* ============================================================================
   INTERLINK INTRANET — DESIGN SYSTEM
   A next-generation design language for the modern digital workplace.
   ============================================================================ */

/* ---------------------------------------------------------------------------
   1. CSS CUSTOM PROPERTIES (Design Tokens)
   --------------------------------------------------------------------------- */
:root {
    /* --- Brand Colours (overridable per tenant) --- */
    --color-primary-50:  #eff6ff;
    --color-primary-100: #dbeafe;
    --color-primary-200: #bfdbfe;
    --color-primary-300: #93c5fd;
    --color-primary-400: #60a5fa;
    --color-primary-500: #3b82f6;
    --color-primary-600: #2563eb;
    --color-primary-700: #1d4ed8;
    --color-primary-800: #1e40af;
    --color-primary-900: #1e3a8a;

    --color-accent-50:  #f5f3ff;
    --color-accent-100: #ede9fe;
    --color-accent-200: #ddd6fe;
    --color-accent-300: #c4b5fd;
    --color-accent-400: #a78bfa;
    --color-accent-500: #8b5cf6;
    --color-accent-600: #7c3aed;
    --color-accent-700: #6d28d9;

    /* --- Neutral Palette --- */
    --color-white:    #ffffff;
    --color-gray-25:  #fcfcfd;
    --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;
    --color-gray-950: #020617;

    /* --- Semantic Colours --- */
    --color-success-50:  #f0fdf4;
    --color-success-100: #dcfce7;
    --color-success-500: #22c55e;
    --color-success-600: #16a34a;
    --color-success-700: #15803d;

    --color-warning-50:  #fffbeb;
    --color-warning-100: #fef3c7;
    --color-warning-500: #f59e0b;
    --color-warning-600: #d97706;

    --color-danger-50:  #fef2f2;
    --color-danger-100: #fee2e2;
    --color-danger-500: #ef4444;
    --color-danger-600: #dc2626;
    --color-danger-700: #b91c1c;

    --color-info-50:  #f0f9ff;
    --color-info-100: #e0f2fe;
    --color-info-500: #0ea5e9;
    --color-info-600: #0284c7;

    /* --- Typography --- */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;

    --text-xs:   0.75rem;    /* 12px */
    --text-sm:   0.8125rem;  /* 13px */
    --text-base: 0.875rem;   /* 14px */
    --text-md:   0.9375rem;  /* 15px */
    --text-lg:   1.0625rem;  /* 17px */
    --text-xl:   1.25rem;    /* 20px */
    --text-2xl:  1.5rem;     /* 24px */
    --text-3xl:  1.875rem;   /* 30px */
    --text-4xl:  2.25rem;    /* 36px */

    --leading-tight:  1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;

    --tracking-tight:  -0.025em;
    --tracking-normal:  0;
    --tracking-wide:    0.025em;

    /* --- Spacing Scale --- */
    --space-0:   0;
    --space-0-5: 0.125rem;
    --space-1:   0.25rem;
    --space-1-5: 0.375rem;
    --space-2:   0.5rem;
    --space-2-5: 0.625rem;
    --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;
    --space-16:  4rem;
    --space-20:  5rem;
    --space-24:  6rem;

    /* --- Border Radius --- */
    --radius-sm:   0.375rem;
    --radius-md:   0.5rem;
    --radius-lg:   0.75rem;
    --radius-xl:   1rem;
    --radius-2xl:  1.25rem;
    --radius-full: 9999px;

    /* --- Shadows (layered for depth) --- */
    --shadow-xs:  0 1px 2px 0 rgba(0,0,0,0.04);
    --shadow-sm:  0 1px 3px 0 rgba(0,0,0,0.06), 0 1px 2px -1px rgba(0,0,0,0.06);
    --shadow-md:  0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg:  0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
    --shadow-xl:  0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0,0,0,0.16);
    --shadow-inner: inset 0 2px 4px 0 rgba(0,0,0,0.04);
    --shadow-ring: 0 0 0 3px rgba(59,130,246,0.15);
    --shadow-ring-accent: 0 0 0 3px rgba(139,92,246,0.15);

    /* --- Z-Index Scale --- */
    --z-dropdown:  100;
    --z-sticky:    200;
    --z-modal:     300;
    --z-popover:   400;
    --z-toast:     500;
    --z-tooltip:   600;

    /* --- Layout --- */
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 68px;
    --header-height: 56px;
    --max-content-width: 1280px;

    /* --- Transitions --- */
    --transition-fast:   150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base:   200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow:   300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* --- Dark mode tokens (future) --- */
@media (prefers-color-scheme: dark) {
    :root.auto-dark {
        --color-gray-50:  #1e293b;
        --color-gray-100: #334155;
        --color-gray-200: #475569;
        --color-gray-800: #f1f5f9;
        --color-gray-900: #f8fafc;
    }
}

/* ---------------------------------------------------------------------------
   2. 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;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-gray-800);
    background-color: var(--color-gray-50);
    min-height: 100vh;
}

a { color: var(--color-primary-600); text-decoration: none; }
a:hover { color: var(--color-primary-700); }

img, svg { display: block; max-width: 100%; }

input, select, textarea, button {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
}

::selection {
    background-color: var(--color-primary-100);
    color: var(--color-primary-900);
}

:focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ---------------------------------------------------------------------------
   3. TYPOGRAPHY
   --------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
    font-weight: 650;
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tight);
    color: var(--color-gray-900);
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5 { font-size: var(--text-md); }

.text-xs   { font-size: var(--text-xs); }
.text-sm   { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-md   { font-size: var(--text-md); }
.text-lg   { font-size: var(--text-lg); }
.text-xl   { font-size: var(--text-xl); }
.text-2xl  { font-size: var(--text-2xl); }
.text-3xl  { font-size: var(--text-3xl); }

.text-muted    { color: var(--color-gray-500); }
.text-subtle   { color: var(--color-gray-400); }
.text-strong   { font-weight: 600; }
.text-mono     { font-family: var(--font-mono); }
.text-truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.text-center   { text-align: center; }
.text-right    { text-align: right; }

/* ---------------------------------------------------------------------------
   4. LAYOUT — APP SHELL
   --------------------------------------------------------------------------- */
.app-shell {
    display: flex;
    min-height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--color-gray-900);
    color: var(--color-gray-300);
    display: flex;
    flex-direction: column;
    z-index: var(--z-sticky);
    transition: width var(--transition-slow);
    overflow: hidden;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-5) var(--space-5);
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.sidebar-brand-logo {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--color-primary-500), var(--color-accent-500));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: var(--text-md);
    color: white;
    flex-shrink: 0;
}

.sidebar-brand-name {
    font-size: var(--text-md);
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: -0.02em;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-3) var(--space-3);
}

.sidebar-nav::-webkit-scrollbar { width: 4px; }
.sidebar-nav::-webkit-scrollbar-track { background: transparent; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: var(--radius-full); }

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

.sidebar-section-title {
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-500);
    padding: var(--space-2) var(--space-3);
    margin-bottom: var(--space-1);
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    color: var(--color-gray-400);
    font-size: var(--text-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
    text-decoration: none;
    position: relative;
}

.sidebar-link:hover {
    background: rgba(255,255,255,0.06);
    color: var(--color-white);
}

.sidebar-link.active {
    background: rgba(255,255,255,0.1);
    color: var(--color-white);
}

.sidebar-link.active::before {
    content: '';
    position: absolute;
    left: -12px;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: var(--color-primary-500);
    border-radius: var(--radius-full);
}

.sidebar-link-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    opacity: 0.7;
}

.sidebar-link.active .sidebar-link-icon {
    opacity: 1;
}

.sidebar-link-badge {
    margin-left: auto;
    font-size: var(--text-xs);
    font-weight: 600;
    background: var(--color-primary-600);
    color: white;
    padding: 1px 7px;
    border-radius: var(--radius-full);
    min-width: 20px;
    text-align: center;
}

.sidebar-user {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid rgba(255,255,255,0.06);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.sidebar-user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    object-fit: cover;
    flex-shrink: 0;
}

.sidebar-user-info {
    flex: 1;
    min-width: 0;
}

.sidebar-user-name {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-white);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-user-role {
    font-size: var(--text-xs);
    color: var(--color-gray-500);
}

/* --- Main Content Area --- */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left var(--transition-slow);
}

/* --- Top Header Bar --- */
.header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    height: var(--header-height);
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(12px) saturate(180%);
    -webkit-backdrop-filter: blur(12px) saturate(180%);
    border-bottom: 1px solid var(--color-gray-200);
    display: flex;
    align-items: center;
    padding: 0 var(--space-6);
    gap: var(--space-4);
}

.header-title {
    font-size: var(--text-lg);
    font-weight: 650;
    color: var(--color-gray-900);
    letter-spacing: var(--tracking-tight);
}

.header-breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-gray-500);
}

.header-breadcrumb a { color: var(--color-gray-500); }
.header-breadcrumb a:hover { color: var(--color-primary-600); }
.header-breadcrumb-sep { color: var(--color-gray-300); }

.header-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.header-search {
    position: relative;
}

.header-search-input {
    width: 260px;
    height: 36px;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: 0 var(--space-4) 0 var(--space-10);
    font-size: var(--text-sm);
    background: var(--color-gray-50);
    color: var(--color-gray-800);
    transition: all var(--transition-fast);
}

.header-search-input::placeholder { color: var(--color-gray-400); }

.header-search-input:focus {
    outline: none;
    border-color: var(--color-primary-300);
    box-shadow: var(--shadow-ring);
    background: var(--color-white);
    width: 320px;
}

.header-search-icon {
    position: absolute;
    left: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    color: var(--color-gray-400);
}

/* --- Page Container --- */
.page {
    flex: 1;
    padding: var(--space-6) var(--space-6) var(--space-12);
    max-width: var(--max-content-width);
    width: 100%;
}

.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--space-6);
    gap: var(--space-4);
}

.page-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-gray-900);
    letter-spacing: var(--tracking-tight);
}

.page-subtitle {
    font-size: var(--text-base);
    color: var(--color-gray-500);
    margin-top: var(--space-1);
}

/* ---------------------------------------------------------------------------
   5. COMPONENTS
   --------------------------------------------------------------------------- */

/* --- Card --- */
.card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: box-shadow var(--transition-base);
}

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

.card-header {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--color-gray-100);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-title {
    font-size: var(--text-md);
    font-weight: 650;
    color: var(--color-gray-900);
}

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

.card-footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--color-gray-100);
    background: var(--color-gray-25);
}

/* --- Stat Card --- */
.stat-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    padding: var(--space-5) var(--space-6);
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    transition: all var(--transition-base);
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.stat-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-icon.blue    { background: var(--color-primary-50); color: var(--color-primary-600); }
.stat-icon.purple  { background: var(--color-accent-50); color: var(--color-accent-600); }
.stat-icon.green   { background: var(--color-success-50); color: var(--color-success-600); }
.stat-icon.orange  { background: var(--color-warning-50); color: var(--color-warning-600); }
.stat-icon.red     { background: var(--color-danger-50); color: var(--color-danger-600); }
.stat-icon.cyan    { background: var(--color-info-50); color: var(--color-info-600); }

.stat-value {
    font-size: var(--text-2xl);
    font-weight: 750;
    color: var(--color-gray-900);
    letter-spacing: var(--tracking-tight);
    line-height: 1;
    margin-bottom: var(--space-1);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--color-gray-500);
}

.stat-trend {
    font-size: var(--text-xs);
    font-weight: 600;
    margin-top: var(--space-1);
    display: inline-flex;
    align-items: center;
    gap: 2px;
}

.stat-trend.up   { color: var(--color-success-600); }
.stat-trend.down { color: var(--color-danger-600); }

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    height: 36px;
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    text-decoration: none;
    line-height: 1;
}

.btn:focus-visible {
    outline: none;
    box-shadow: var(--shadow-ring);
}

.btn-primary {
    background: var(--color-primary-600);
    color: white;
    border-color: var(--color-primary-600);
}

.btn-primary:hover {
    background: var(--color-primary-700);
    border-color: var(--color-primary-700);
    color: white;
    box-shadow: var(--shadow-sm);
}

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

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

.btn-ghost {
    background: transparent;
    color: var(--color-gray-600);
    border: none;
}

.btn-ghost:hover {
    background: var(--color-gray-100);
    color: var(--color-gray-800);
}

.btn-danger {
    background: var(--color-danger-600);
    color: white;
    border-color: var(--color-danger-600);
}

.btn-danger:hover {
    background: var(--color-danger-700);
}

.btn-success {
    background: var(--color-success-600);
    color: white;
    border-color: var(--color-success-600);
}

.btn-sm { height: 30px; padding: var(--space-1) var(--space-3); font-size: var(--text-xs); }
.btn-lg { height: 44px; padding: var(--space-3) var(--space-6); font-size: var(--text-base); }

.btn-icon {
    width: 36px;
    padding: 0;
}

.btn-icon.btn-sm { width: 30px; }

/* --- Form Controls --- */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-gray-700);
    margin-bottom: var(--space-1-5);
}

.form-label-optional {
    font-weight: 400;
    color: var(--color-gray-400);
    margin-left: var(--space-1);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    height: 40px;
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    color: var(--color-gray-800);
    background: var(--color-white);
    transition: all var(--transition-fast);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--color-gray-400);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary-400);
    box-shadow: var(--shadow-ring);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
    border-color: var(--color-danger-500);
    box-shadow: 0 0 0 3px rgba(239,68,68,0.1);
}

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

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

.form-error {
    font-size: var(--text-xs);
    color: var(--color-danger-600);
    margin-top: var(--space-1);
}

/* --- Badges / Tags --- */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 10px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    line-height: 1.5;
    white-space: nowrap;
}

.badge-primary { background: var(--color-primary-50); color: var(--color-primary-700); }
.badge-accent  { background: var(--color-accent-50); color: var(--color-accent-700); }
.badge-success { background: var(--color-success-50); color: var(--color-success-700); }
.badge-warning { background: var(--color-warning-50); color: var(--color-warning-600); }
.badge-danger  { background: var(--color-danger-50); color: var(--color-danger-700); }
.badge-info    { background: var(--color-info-50); color: var(--color-info-600); }
.badge-gray    { background: var(--color-gray-100); color: var(--color-gray-600); }

.badge-dot::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: var(--radius-full);
    background: currentColor;
}

/* --- Avatar --- */
.avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    object-fit: cover;
    flex-shrink: 0;
    border: 2px solid var(--color-white);
}

.avatar-xs { width: 24px; height: 24px; }
.avatar-sm { width: 32px; height: 32px; }
.avatar-lg { width: 48px; height: 48px; }
.avatar-xl { width: 64px; height: 64px; }

.avatar-stack {
    display: flex;
}

.avatar-stack .avatar { margin-left: -8px; }
.avatar-stack .avatar:first-child { margin-left: 0; }

/* --- Table --- */
.table-container {
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: var(--color-white);
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th {
    text-align: left;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-gray-500);
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--color-gray-200);
}

.table td {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    color: var(--color-gray-700);
    border-bottom: 1px solid var(--color-gray-100);
}

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

.table tbody tr {
    transition: background var(--transition-fast);
}

.table tbody tr:hover {
    background: var(--color-gray-25);
}

/* --- Empty State --- */
.empty-state {
    text-align: center;
    padding: var(--space-16) var(--space-8);
}

.empty-state-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-5);
    background: var(--color-gray-100);
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-gray-400);
}

.empty-state-title {
    font-size: var(--text-lg);
    font-weight: 650;
    color: var(--color-gray-800);
    margin-bottom: var(--space-2);
}

.empty-state-description {
    font-size: var(--text-base);
    color: var(--color-gray-500);
    max-width: 400px;
    margin: 0 auto var(--space-5);
}

/* --- Toast / Alert --- */
.toast {
    position: fixed;
    top: var(--space-4);
    right: var(--space-4);
    z-index: var(--z-toast);
    min-width: 320px;
    max-width: 480px;
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-xl);
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    animation: toast-in 0.3s ease-out;
}

.toast-success { border-left: 4px solid var(--color-success-500); }
.toast-error   { border-left: 4px solid var(--color-danger-500); }
.toast-info    { border-left: 4px solid var(--color-info-500); }
.toast-warning { border-left: 4px solid var(--color-warning-500); }

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

/* --- Modal --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15,23,42,0.5);
    backdrop-filter: blur(4px);
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    animation: fade-in 0.2s ease-out;
}

.modal {
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    width: 100%;
    max-width: 560px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modal-in 0.25s ease-out;
}

.modal-header {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--color-gray-100);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: var(--text-lg);
    font-weight: 650;
}

.modal-body {
    padding: var(--space-6);
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--color-gray-100);
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
    background: var(--color-gray-25);
}

@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes modal-in {
    from { transform: scale(0.95) translateY(10px); opacity: 0; }
    to { transform: scale(1) translateY(0); opacity: 1; }
}

/* --- Dropdown --- */
.dropdown {
    position: relative;
    display: inline-flex;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--space-1);
    min-width: 200px;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-dropdown);
    padding: var(--space-1);
    animation: dropdown-in 0.15s ease-out;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-2-5);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    color: var(--color-gray-700);
    cursor: pointer;
    transition: background var(--transition-fast);
    text-decoration: none;
}

.dropdown-item:hover {
    background: var(--color-gray-50);
    color: var(--color-gray-900);
}

.dropdown-item-danger:hover {
    background: var(--color-danger-50);
    color: var(--color-danger-700);
}

.dropdown-divider {
    height: 1px;
    background: var(--color-gray-100);
    margin: var(--space-1) 0;
}

@keyframes dropdown-in {
    from { transform: translateY(-4px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* --- Tabs --- */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--color-gray-200);
    gap: 0;
}

.tab {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-gray-500);
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: -1px;
    text-decoration: none;
}

.tab:hover { color: var(--color-gray-700); }

.tab.active {
    color: var(--color-primary-600);
    border-bottom-color: var(--color-primary-600);
    font-weight: 600;
}

/* --- Kanban Board --- */
.kanban {
    display: flex;
    gap: var(--space-4);
    overflow-x: auto;
    padding-bottom: var(--space-4);
    min-height: 500px;
}

.kanban-column {
    width: 300px;
    min-width: 300px;
    background: var(--color-gray-50);
    border-radius: var(--radius-xl);
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
}

.kanban-column-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
    padding: 0 var(--space-1);
}

.kanban-column-title {
    font-size: var(--text-sm);
    font-weight: 650;
    color: var(--color-gray-700);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.kanban-column-count {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--color-gray-400);
    background: var(--color-gray-200);
    padding: 1px 8px;
    border-radius: var(--radius-full);
}

.kanban-cards {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    min-height: 100px;
}

.kanban-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: var(--space-3) var(--space-4);
    cursor: grab;
    transition: all var(--transition-fast);
}

.kanban-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-gray-300);
}

.kanban-card:active {
    cursor: grabbing;
    box-shadow: var(--shadow-lg);
    transform: rotate(2deg);
}

.kanban-card-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-gray-800);
    margin-bottom: var(--space-2);
}

.kanban-card-meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--text-xs);
    color: var(--color-gray-500);
}

/* --- Priority Indicators --- */
.priority-urgent { color: var(--color-danger-600); }
.priority-high   { color: var(--color-warning-600); }
.priority-medium { color: var(--color-primary-600); }
.priority-low    { color: var(--color-gray-400); }

.priority-dot {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.priority-dot.urgent { background: var(--color-danger-500); }
.priority-dot.high   { background: var(--color-warning-500); }
.priority-dot.medium { background: var(--color-primary-500); }
.priority-dot.low    { background: var(--color-gray-300); }

/* --- Progress Bar --- */
.progress {
    height: 6px;
    background: var(--color-gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary-500), var(--color-accent-500));
    border-radius: var(--radius-full);
    transition: width 0.6s ease-out;
}

/* --- Activity Feed --- */
.activity-item {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-3) 0;
}

.activity-item + .activity-item {
    border-top: 1px solid var(--color-gray-100);
}

.activity-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.activity-content {
    flex: 1;
    min-width: 0;
}

.activity-text {
    font-size: var(--text-sm);
    color: var(--color-gray-700);
    line-height: var(--leading-relaxed);
}

.activity-text strong {
    font-weight: 600;
    color: var(--color-gray-800);
}

.activity-time {
    font-size: var(--text-xs);
    color: var(--color-gray-400);
    margin-top: var(--space-0-5);
}

/* ---------------------------------------------------------------------------
   6. 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; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.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-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

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

.w-full { width: 100%; }
.h-full { height: 100%; }

.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.ml-auto { margin-left: auto; }
.mr-2 { margin-right: var(--space-2); }

.p-0 { padding: 0; }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }

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

.hidden { display: none !important; }
.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; }

.relative { position: relative; }
.absolute { position: absolute; }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }

.border { border: 1px solid var(--color-gray-200); }
.border-b { border-bottom: 1px solid var(--color-gray-200); }

.bg-white { background: var(--color-white); }
.bg-gray-50 { background: var(--color-gray-50); }

/* ---------------------------------------------------------------------------
   7. RESPONSIVE
   --------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

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

@media (max-width: 640px) {
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }

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

    .kanban-column {
        width: 260px;
        min-width: 260px;
    }
}

/* ---------------------------------------------------------------------------
   8. PRINT
   --------------------------------------------------------------------------- */
@media print {
    .sidebar, .header, .header-actions { display: none !important; }
    .main-content { margin-left: 0 !important; }
    body { background: white; }
    .card { box-shadow: none; border: 1px solid #ddd; }
}