/**
 * Microsoft Fluent Design System
 * Professional Enterprise Application Styling
 * Version: 1.0
 */

/* ===========================
   FLUENT DESIGN FOUNDATIONS
   =========================== */

:root {
    /* Fluent Color System - Light Theme */
    --fluent-bg-primary: #ffffff;
    --fluent-bg-secondary: #faf9f8;
    --fluent-bg-tertiary: #f3f2f1;
    --fluent-bg-canvas: #ffffff;

    /* Surface Colors */
    --fluent-surface-primary: #ffffff;
    --fluent-surface-secondary: #f3f2f1;
    --fluent-surface-tertiary: #edebe9;

    /* Text Colors */
    --fluent-text-primary: #201f1e;
    --fluent-text-secondary: #323130;
    --fluent-text-tertiary: #605e5c;
    --fluent-text-disabled: #a19f9d;

    /* Brand Colors (Microsoft Blue) */
    --fluent-brand-primary: #0078d4;
    --fluent-brand-secondary: #106ebe;
    --fluent-brand-tertiary: #005a9e;
    --fluent-brand-light: #2b88d8;

    /* Semantic Colors */
    --fluent-success: #107c10;
    --fluent-warning: #f7630c;
    --fluent-error: #d13438;
    --fluent-info: #0078d4;

    /* Border Colors */
    --fluent-border-primary: #edebe9;
    --fluent-border-secondary: #d2d0ce;
    --fluent-border-tertiary: #c8c6c4;

    /* Shadow System */
    --fluent-shadow-2: 0 0.3px 0.9px rgba(0, 0, 0, 0.05), 0 1.6px 3.6px rgba(0, 0, 0, 0.07);
    --fluent-shadow-4: 0 0.6px 1.8px rgba(0, 0, 0, 0.05), 0 3.2px 7.2px rgba(0, 0, 0, 0.07);
    --fluent-shadow-8: 0 1.2px 3.6px rgba(0, 0, 0, 0.05), 0 6.4px 14.4px rgba(0, 0, 0, 0.09);
    --fluent-shadow-16: 0 2.4px 7.2px rgba(0, 0, 0, 0.07), 0 12.8px 28.8px rgba(0, 0, 0, 0.11);
    --fluent-shadow-28: 0 4.8px 14.4px rgba(0, 0, 0, 0.09), 0 25.6px 57.6px rgba(0, 0, 0, 0.13);

    /* Typography */
    --fluent-font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', 'Helvetica Neue', sans-serif;
    --fluent-font-weight-regular: 400;
    --fluent-font-weight-semibold: 600;
    --fluent-font-weight-bold: 700;

    /* Font Sizes */
    --fluent-font-size-10: 10px;
    --fluent-font-size-12: 12px;
    --fluent-font-size-14: 14px;
    --fluent-font-size-16: 16px;
    --fluent-font-size-18: 18px;
    --fluent-font-size-20: 20px;
    --fluent-font-size-24: 24px;
    --fluent-font-size-28: 28px;
    --fluent-font-size-32: 32px;
    --fluent-font-size-40: 40px;

    /* Border Radius */
    --fluent-radius-small: 2px;
    --fluent-radius-medium: 4px;
    --fluent-radius-large: 8px;

    /* Spacing Scale */
    --fluent-space-xxs: 4px;
    --fluent-space-xs: 8px;
    --fluent-space-s: 12px;
    --fluent-space-m: 16px;
    --fluent-space-l: 20px;
    --fluent-space-xl: 24px;
    --fluent-space-xxl: 32px;
    --fluent-space-xxxl: 40px;

    /* Transitions */
    --fluent-duration-fast: 100ms;
    --fluent-duration-normal: 200ms;
    --fluent-duration-slow: 367ms;
    --fluent-easing: cubic-bezier(0.1, 0.9, 0.2, 1);
}

/* Dark Theme Support */
@media (prefers-color-scheme: dark) {
    :root {
        --fluent-bg-primary: #1f1f1f;
        --fluent-bg-secondary: #2d2d2d;
        --fluent-bg-tertiary: #3b3b3b;

        --fluent-surface-primary: #252525;
        --fluent-surface-secondary: #2d2d2d;
        --fluent-surface-tertiary: #323232;

        --fluent-text-primary: #ffffff;
        --fluent-text-secondary: #e1dfdd;
        --fluent-text-tertiary: #c8c6c4;
        --fluent-text-disabled: #797775;

        --fluent-border-primary: #3b3a39;
        --fluent-border-secondary: #484644;
        --fluent-border-tertiary: #605e5c;
    }
}

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

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

body {
    font-family: var(--fluent-font-family);
    font-size: var(--fluent-font-size-14);
    font-weight: var(--fluent-font-weight-regular);
    color: var(--fluent-text-primary);
    background-color: var(--fluent-bg-secondary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===========================
   FLUENT COMPONENTS
   =========================== */

/* Card Component */
.fluent-card {
    background: var(--fluent-surface-primary);
    border: 1px solid var(--fluent-border-primary);
    border-radius: var(--fluent-radius-medium);
    box-shadow: var(--fluent-shadow-2);
    transition: box-shadow var(--fluent-duration-normal) var(--fluent-easing);
}

.fluent-card:hover {
    box-shadow: var(--fluent-shadow-8);
}

.fluent-card-header {
    padding: var(--fluent-space-m) var(--fluent-space-l);
    border-bottom: 1px solid var(--fluent-border-primary);
}

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

.fluent-card-footer {
    padding: var(--fluent-space-m) var(--fluent-space-l);
    border-top: 1px solid var(--fluent-border-primary);
    background: var(--fluent-bg-tertiary);
}

/* Button Component */
.fluent-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--fluent-space-xs) var(--fluent-space-m);
    font-family: var(--fluent-font-family);
    font-size: var(--fluent-font-size-14);
    font-weight: var(--fluent-font-weight-semibold);
    line-height: 20px;
    border: 1px solid transparent;
    border-radius: var(--fluent-radius-medium);
    cursor: pointer;
    transition: all var(--fluent-duration-fast) var(--fluent-easing);
    text-decoration: none;
    outline: none;
}

.fluent-button-primary {
    background: var(--fluent-brand-primary);
    color: #ffffff;
    border-color: var(--fluent-brand-primary);
}

.fluent-button-primary:hover {
    background: var(--fluent-brand-secondary);
    border-color: var(--fluent-brand-secondary);
}

.fluent-button-primary:active {
    background: var(--fluent-brand-tertiary);
    border-color: var(--fluent-brand-tertiary);
}

.fluent-button-secondary {
    background: var(--fluent-surface-primary);
    color: var(--fluent-text-primary);
    border-color: var(--fluent-border-secondary);
}

.fluent-button-secondary:hover {
    background: var(--fluent-surface-secondary);
    border-color: var(--fluent-border-tertiary);
}

.fluent-button-ghost {
    background: transparent;
    color: var(--fluent-brand-primary);
    border-color: transparent;
}

.fluent-button-ghost:hover {
    background: var(--fluent-surface-secondary);
}

.fluent-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Input Component */
.fluent-input {
    width: 100%;
    padding: var(--fluent-space-xs) var(--fluent-space-s);
    font-family: var(--fluent-font-family);
    font-size: var(--fluent-font-size-14);
    color: var(--fluent-text-primary);
    background: var(--fluent-surface-primary);
    border: 1px solid var(--fluent-border-secondary);
    border-radius: var(--fluent-radius-small);
    outline: none;
    transition: all var(--fluent-duration-fast) var(--fluent-easing);
}

.fluent-input:hover {
    border-color: var(--fluent-border-tertiary);
}

.fluent-input:focus {
    border-color: var(--fluent-brand-primary);
    box-shadow: 0 0 0 1px var(--fluent-brand-primary);
}

.fluent-input:disabled {
    background: var(--fluent-surface-tertiary);
    color: var(--fluent-text-disabled);
    cursor: not-allowed;
}

/* Label Component */
.fluent-label {
    display: block;
    margin-bottom: var(--fluent-space-xxs);
    font-size: var(--fluent-font-size-14);
    font-weight: var(--fluent-font-weight-semibold);
    color: var(--fluent-text-primary);
}

/* Badge Component */
.fluent-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px var(--fluent-space-xs);
    font-size: var(--fluent-font-size-12);
    font-weight: var(--fluent-font-weight-semibold);
    border-radius: var(--fluent-radius-small);
    white-space: nowrap;
}

.fluent-badge-success {
    background: rgba(16, 124, 16, 0.1);
    color: var(--fluent-success);
}

.fluent-badge-warning {
    background: rgba(247, 99, 12, 0.1);
    color: var(--fluent-warning);
}

.fluent-badge-error {
    background: rgba(209, 52, 56, 0.1);
    color: var(--fluent-error);
}

.fluent-badge-info {
    background: rgba(0, 120, 212, 0.1);
    color: var(--fluent-info);
}

.fluent-badge-neutral {
    background: var(--fluent-surface-tertiary);
    color: var(--fluent-text-secondary);
}

/* Status Indicator */
.fluent-status {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: var(--fluent-space-xs);
}

.fluent-status-success {
    background: var(--fluent-success);
}

.fluent-status-warning {
    background: var(--fluent-warning);
}

.fluent-status-error {
    background: var(--fluent-error);
}

.fluent-status-info {
    background: var(--fluent-info);
}

.fluent-status-neutral {
    background: var(--fluent-text-disabled);
}

/* Progress Bar */
.fluent-progress {
    width: 100%;
    height: 4px;
    background: var(--fluent-surface-tertiary);
    border-radius: var(--fluent-radius-small);
    overflow: hidden;
}

.fluent-progress-bar {
    height: 100%;
    background: var(--fluent-brand-primary);
    transition: width var(--fluent-duration-slow) var(--fluent-easing);
}

.fluent-progress-bar.success {
    background: var(--fluent-success);
}

.fluent-progress-bar.warning {
    background: var(--fluent-warning);
}

.fluent-progress-bar.error {
    background: var(--fluent-error);
}

/* Divider */
.fluent-divider {
    height: 1px;
    background: var(--fluent-border-primary);
    border: none;
    margin: var(--fluent-space-m) 0;
}

/* Stack Layout */
.fluent-stack {
    display: flex;
    flex-direction: column;
    gap: var(--fluent-space-m);
}

.fluent-stack-horizontal {
    flex-direction: row;
}

.fluent-stack-center {
    align-items: center;
}

.fluent-stack-between {
    justify-content: space-between;
}

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

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

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

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

/* Typography */
.fluent-title-large {
    font-size: var(--fluent-font-size-32);
    font-weight: var(--fluent-font-weight-semibold);
    line-height: 40px;
}

.fluent-title {
    font-size: var(--fluent-font-size-24);
    font-weight: var(--fluent-font-weight-semibold);
    line-height: 32px;
}

.fluent-subtitle {
    font-size: var(--fluent-font-size-20);
    font-weight: var(--fluent-font-weight-semibold);
    line-height: 28px;
}

.fluent-body-large {
    font-size: var(--fluent-font-size-16);
    line-height: 24px;
}

.fluent-body {
    font-size: var(--fluent-font-size-14);
    line-height: 20px;
}

.fluent-caption {
    font-size: var(--fluent-font-size-12);
    line-height: 16px;
    color: var(--fluent-text-secondary);
}

/* Navigation */
.fluent-nav {
    background: var(--fluent-surface-primary);
    border-right: 1px solid var(--fluent-border-primary);
}

.fluent-nav-item {
    display: flex;
    align-items: center;
    padding: var(--fluent-space-xs) var(--fluent-space-m);
    color: var(--fluent-text-primary);
    text-decoration: none;
    transition: background var(--fluent-duration-fast) var(--fluent-easing);
    cursor: pointer;
}

.fluent-nav-item:hover {
    background: var(--fluent-surface-secondary);
}

.fluent-nav-item.active {
    background: var(--fluent-surface-secondary);
    color: var(--fluent-brand-primary);
    border-left: 3px solid var(--fluent-brand-primary);
}

/* Toolbar */
.fluent-toolbar {
    display: flex;
    align-items: center;
    gap: var(--fluent-space-xs);
    padding: var(--fluent-space-xs);
    background: var(--fluent-surface-primary);
    border-bottom: 1px solid var(--fluent-border-primary);
}

/* List */
.fluent-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.fluent-list-item {
    display: flex;
    align-items: center;
    padding: var(--fluent-space-s) var(--fluent-space-m);
    border-bottom: 1px solid var(--fluent-border-primary);
    transition: background var(--fluent-duration-fast) var(--fluent-easing);
}

.fluent-list-item:hover {
    background: var(--fluent-surface-secondary);
}

.fluent-list-item:last-child {
    border-bottom: none;
}

/* Dialog/Modal */
.fluent-dialog-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;
}

.fluent-dialog {
    background: var(--fluent-surface-primary);
    border-radius: var(--fluent-radius-large);
    box-shadow: var(--fluent-shadow-28);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow: auto;
}

.fluent-dialog-header {
    padding: var(--fluent-space-l);
    border-bottom: 1px solid var(--fluent-border-primary);
}

.fluent-dialog-body {
    padding: var(--fluent-space-l);
}

.fluent-dialog-footer {
    padding: var(--fluent-space-l);
    border-top: 1px solid var(--fluent-border-primary);
    display: flex;
    justify-content: flex-end;
    gap: var(--fluent-space-xs);
}

/* Table */
.fluent-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--fluent-surface-primary);
}

.fluent-table thead {
    background: var(--fluent-surface-secondary);
}

.fluent-table th {
    padding: var(--fluent-space-s) var(--fluent-space-m);
    text-align: left;
    font-weight: var(--fluent-font-weight-semibold);
    font-size: var(--fluent-font-size-12);
    color: var(--fluent-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--fluent-border-primary);
}

.fluent-table td {
    padding: var(--fluent-space-s) var(--fluent-space-m);
    border-bottom: 1px solid var(--fluent-border-primary);
}

.fluent-table tr:hover {
    background: var(--fluent-surface-secondary);
}

/* Spinner/Loading */
.fluent-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--fluent-border-primary);
    border-top-color: var(--fluent-brand-primary);
    border-radius: 50%;
    animation: fluent-spin 0.8s linear infinite;
}

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

/* Tabs */
.fluent-tabs {
    display: flex;
    border-bottom: 1px solid var(--fluent-border-primary);
}

.fluent-tab {
    padding: var(--fluent-space-s) var(--fluent-space-l);
    font-weight: var(--fluent-font-weight-semibold);
    color: var(--fluent-text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all var(--fluent-duration-fast) var(--fluent-easing);
}

.fluent-tab:hover {
    color: var(--fluent-text-primary);
    background: var(--fluent-surface-secondary);
}

.fluent-tab.active {
    color: var(--fluent-brand-primary);
    border-bottom-color: var(--fluent-brand-primary);
}

/* Tooltip */
.fluent-tooltip {
    position: absolute;
    padding: var(--fluent-space-xxs) var(--fluent-space-xs);
    font-size: var(--fluent-font-size-12);
    background: var(--fluent-text-primary);
    color: var(--fluent-surface-primary);
    border-radius: var(--fluent-radius-small);
    box-shadow: var(--fluent-shadow-8);
    z-index: 1000;
    pointer-events: none;
}

/* Acrylic Effect */
.fluent-acrylic {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(40px) saturate(125%);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

@media (prefers-color-scheme: dark) {
    .fluent-acrylic {
        background: rgba(44, 44, 44, 0.7);
        border-color: rgba(255, 255, 255, 0.1);
    }
}

/* Reveal Effect on Hover */
.fluent-reveal {
    position: relative;
    overflow: hidden;
}

.fluent-reveal::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(255, 255, 255, 0.1) 0%, transparent 60%);
    opacity: 0;
    transition: opacity var(--fluent-duration-fast) var(--fluent-easing);
    pointer-events: none;
}

.fluent-reveal:hover::before {
    opacity: 1;
}

/* Utility Classes */
.fluent-shadow-2 { box-shadow: var(--fluent-shadow-2); }
.fluent-shadow-4 { box-shadow: var(--fluent-shadow-4); }
.fluent-shadow-8 { box-shadow: var(--fluent-shadow-8); }
.fluent-shadow-16 { box-shadow: var(--fluent-shadow-16); }
.fluent-shadow-28 { box-shadow: var(--fluent-shadow-28); }

.fluent-text-primary { color: var(--fluent-text-primary); }
.fluent-text-secondary { color: var(--fluent-text-secondary); }
.fluent-text-tertiary { color: var(--fluent-text-tertiary); }
.fluent-text-disabled { color: var(--fluent-text-disabled); }

.fluent-bg-primary { background: var(--fluent-bg-primary); }
.fluent-bg-secondary { background: var(--fluent-bg-secondary); }
.fluent-bg-tertiary { background: var(--fluent-bg-tertiary); }

/* Responsive Breakpoints */
@media (max-width: 640px) {
    .fluent-grid-2,
    .fluent-grid-3,
    .fluent-grid-4 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1024px) {
    .fluent-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}