/* Microsoft Fluent Design System - DiffTool */

:root, :root.darktheme {
    /* Spacing */
    --dt-spacing-xs: 4px;
    --dt-spacing-sm: 8px;
    --dt-spacing-md: 12px;
    --dt-spacing-lg: 16px;
    --dt-spacing-xl: 24px;

    /* Border radius - Fluent uses subtle rounding */
    --dt-radius-sm: 4px;
    --dt-radius-md: 6px;
    --dt-radius-lg: 8px;

    /* Typography */
    --dt-font-family: 'Segoe UI Variable', 'Segoe UI', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    --dt-font-size-caption: 12px;
    --dt-font-size-body: 14px;
    --dt-font-weight-regular: 400;
    --dt-font-weight-semibold: 600;

    /* Transitions */
    --dt-transition-fast: 0.1s ease;
    --dt-transition-normal: 0.2s ease;
}

/* Light theme - Clean, minimal */
:root {
    /* Background layers */
    --dt-bg-solid: #f8f8f8;
    --dt-bg-layer: #ffffff;
    --dt-bg-card: #fcfcfc;
    --dt-bg-subtle: #f3f3f3;

    /* Text */
    --dt-text-primary: #242424;
    --dt-text-secondary: #666666;
    --dt-text-tertiary: #999999;
    --dt-text-on-accent: #ffffff;

    /* Accent - Muted blue */
    --dt-accent: #2a7de1;
    --dt-accent-hover: #1a6ed0;
    --dt-accent-light: rgba(42, 125, 225, 0.06);

    /* Borders */
    --dt-border-default: #e5e5e5;
    --dt-border-subtle: #eeeeee;

    /* Controls */
    --dt-control-bg: #ffffff;
    --dt-control-bg-hover: #f5f5f5;
    --dt-control-bg-active: #eeeeee;
    --dt-control-border: #d8d8d8;

    /* Focus */
    --dt-focus-outer: rgba(42, 125, 225, 0.3);
    --dt-focus-inner: #ffffff;

    /* Shadow - very subtle */
    --dt-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --dt-shadow-md: 0 2px 6px rgba(0, 0, 0, 0.06);

    /* Theme icon */
    --dt-icon-theme-24: url('../resources/icons/buttons/light-theme-24.svg');
}

/* Dark theme - Muted, easy on eyes */
:root.darktheme {
    /* Background layers - slightly warmer grays */
    --dt-bg-solid: #1a1a1a;
    --dt-bg-layer: #242424;
    --dt-bg-card: #1e1e1e;
    --dt-bg-subtle: #2a2a2a;

    /* Text - slightly softer white */
    --dt-text-primary: #e4e4e4;
    --dt-text-secondary: #999999;
    --dt-text-tertiary: #707070;
    --dt-text-on-accent: #ffffff;

    /* Accent - Muted blue, easier on eyes */
    --dt-accent: #4a9eff;
    --dt-accent-hover: #6eb3ff;
    --dt-accent-light: rgba(74, 158, 255, 0.08);

    /* Borders - subtle */
    --dt-border-default: #333333;
    --dt-border-subtle: #2d2d2d;

    /* Controls - minimal contrast */
    --dt-control-bg: #2a2a2a;
    --dt-control-bg-hover: #333333;
    --dt-control-bg-active: #3a3a3a;
    --dt-control-border: #3d3d3d;

    /* Focus */
    --dt-focus-outer: rgba(74, 158, 255, 0.3);
    --dt-focus-inner: #242424;

    /* Shadow - subtle */
    --dt-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.15);
    --dt-shadow-md: 0 2px 6px rgba(0, 0, 0, 0.2);

    /* Theme icon */
    --dt-icon-theme-24: url('../resources/icons/buttons/dark-theme-24.svg');
}

/* Base styles */
*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    height: 100%;
    margin: 0;
}

body {
    padding: var(--dt-spacing-md);
    background-color: var(--dt-bg-solid);
    color: var(--dt-text-primary);
    font-family: var(--dt-font-family);
    font-size: var(--dt-font-size-body);
    transition: background-color var(--dt-transition-normal), color var(--dt-transition-normal);
}

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

button {
    cursor: pointer;
    font-family: inherit;
}

/* Main container */
body > div.dt-main-container {
    display: none;
    flex-direction: column;
    height: 100%;
    width: 100%;
    max-width: 100%;
    background: var(--dt-bg-layer);
    border-radius: var(--dt-radius-lg);
    box-shadow: var(--dt-shadow-md);
    overflow: hidden;
}

/* ========== TAB BAR - Fluent Pivot Style ========== */
ul.dt-tab-bar {
    display: flex;
    align-items: stretch;
    list-style: none;
    margin: 0;
    padding: 0 var(--dt-spacing-md);
    background: var(--dt-bg-layer);
    border-bottom: 1px solid var(--dt-border-subtle);
    min-height: 44px;
    gap: var(--dt-spacing-xs);
}

ul.dt-tab-bar li {
    display: flex;
    align-items: center;
}

ul.dt-tab-bar li.empty-space {
    flex-grow: 1;
}

ul.dt-tab-bar li.last-tab-bar-item {
    margin-left: var(--dt-spacing-sm);
}

/* Tab buttons - Fluent Pivot style with underline indicator */
ul.dt-tab-bar li a {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--dt-spacing-md) var(--dt-spacing-lg);
    color: var(--dt-text-secondary);
    text-decoration: none;
    font-size: var(--dt-font-size-body);
    font-weight: var(--dt-font-weight-regular);
    border-radius: var(--dt-radius-sm) var(--dt-radius-sm) 0 0;
    position: relative;
    transition: color var(--dt-transition-fast), background-color var(--dt-transition-fast);
}

ul.dt-tab-bar li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--dt-accent);
    border-radius: 2px 2px 0 0;
    transform: translateX(-50%);
    transition: width var(--dt-transition-normal);
}

ul.dt-tab-bar li a:hover {
    color: var(--dt-text-primary);
    background: var(--dt-accent-light);
}

ul.dt-tab-bar li a.active {
    color: var(--dt-accent);
    font-weight: var(--dt-font-weight-semibold);
    background: transparent;
}

ul.dt-tab-bar li a.active::after {
    width: calc(100% - var(--dt-spacing-lg));
}

ul.dt-tab-bar li a:focus-visible {
    outline: 2px solid var(--dt-focus-outer);
    outline-offset: -2px;
    border-radius: var(--dt-radius-sm);
}

/* Theme toggle button */
ul.dt-tab-bar li a[data-tab-id="theme"] {
    padding: var(--dt-spacing-sm);
    border-radius: var(--dt-radius-sm);
}

ul.dt-tab-bar li a[data-tab-id="theme"]::after {
    display: none;
}

ul.dt-tab-bar li a[data-tab-id="theme"]:hover {
    background: var(--dt-control-bg-hover);
}

/* Ensure theme icon stays visible in all states */
ul.dt-tab-bar li a[data-tab-id="theme"]:active,
ul.dt-tab-bar li a[data-tab-id="theme"]:focus,
ul.dt-tab-bar li a[data-tab-id="theme"]:focus-visible,
ul.dt-tab-bar li a[data-tab-id="theme"].active {
    background: transparent;
    color: inherit;
}

ul.dt-tab-bar li a[data-tab-id="theme"].dt-icon {
    background-image: var(--dt-icon-theme-24) !important;
}

/* ========== TAB CONTENT ========== */
.dt-tab-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--dt-spacing-md);
    overflow: hidden;
    min-height: 0;
}

/* ========== MODERN TOOLBAR ========== */
.dt-toolbar {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: var(--dt-spacing-md);
    padding: var(--dt-spacing-sm) 0;
    margin-bottom: var(--dt-spacing-sm);
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.dt-toolbar::-webkit-scrollbar {
    display: none;
}

/* Toolbar Groups */
.dt-toolbar-group {
    display: flex;
    align-items: center;
    gap: var(--dt-spacing-xs);
    flex-shrink: 0;
}

/* Segmented button group - connected buttons */
.dt-toolbar-group-segmented {
    gap: 0;
}

.dt-toolbar-group-segmented .dt-toolbar-btn {
    border-radius: 0;
    margin-left: -1px;
}

.dt-toolbar-group-segmented .dt-toolbar-btn:first-child {
    border-radius: var(--dt-radius-sm) 0 0 var(--dt-radius-sm);
    margin-left: 0;
}

.dt-toolbar-group-segmented .dt-toolbar-btn:last-child {
    border-radius: 0 var(--dt-radius-sm) var(--dt-radius-sm) 0;
}

.dt-toolbar-group-segmented .dt-toolbar-btn:only-child {
    border-radius: var(--dt-radius-sm);
}

/* Divider between groups */
.dt-toolbar-divider {
    width: 1px;
    height: 20px;
    background: var(--dt-border-default);
    flex-shrink: 0;
}

/* Spacer pushes right group to the end */
.dt-toolbar-spacer {
    flex-grow: 1;
    min-width: var(--dt-spacing-sm);
}

/* Modern Toolbar Buttons */
.dt-toolbar-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    height: 32px;
    padding: 0 var(--dt-spacing-md);
    background: var(--dt-control-bg);
    color: var(--dt-text-primary);
    border: 1px solid var(--dt-control-border);
    border-radius: var(--dt-radius-sm);
    font-size: var(--dt-font-size-caption);
    font-weight: var(--dt-font-weight-regular);
    white-space: nowrap;
    cursor: pointer;
    transition: all var(--dt-transition-fast);
}

.dt-toolbar-btn svg {
    flex-shrink: 0;
    opacity: 0.8;
}

.dt-toolbar-btn:hover {
    background: var(--dt-control-bg-hover);
    border-color: var(--dt-border-default);
}

.dt-toolbar-btn:hover svg {
    opacity: 1;
}

.dt-toolbar-btn:active {
    background: var(--dt-control-bg-active);
    transform: scale(0.98);
}

.dt-toolbar-btn:focus-visible {
    outline: 2px solid var(--dt-focus-outer);
    outline-offset: 1px;
}

/* Accent button (Download) */
.dt-toolbar-btn-accent {
    background: var(--dt-accent);
    color: var(--dt-text-on-accent);
    border-color: var(--dt-accent);
}

.dt-toolbar-btn-accent svg {
    opacity: 1;
}

.dt-toolbar-btn-accent:hover {
    background: var(--dt-accent-hover);
    border-color: var(--dt-accent-hover);
}

/* Toolbar Select */
.dt-toolbar-select {
    display: inline-flex;
    align-items: center;
    height: 32px;
    padding: 0 var(--dt-spacing-xl) 0 var(--dt-spacing-md);
    background: var(--dt-control-bg);
    color: var(--dt-text-primary);
    border: 1px solid var(--dt-control-border);
    border-radius: var(--dt-radius-sm);
    font-size: var(--dt-font-size-caption);
    font-family: inherit;
    cursor: pointer;
    min-width: 110px;
    transition: all var(--dt-transition-fast);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23888' d='M6 8L2 4h8z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
}

.dt-toolbar-select:hover {
    background-color: var(--dt-control-bg-hover);
    border-color: var(--dt-border-default);
}

.dt-toolbar-select:focus-visible {
    outline: 2px solid var(--dt-focus-outer);
    outline-offset: 1px;
}

/* Legacy support - hide old structure */
.dt-difftool-tab-button,
.dt-difftool-tab-empty {
    display: none;
}

/* ========== MONACO EDITOR CONTAINERS ========== */
#monaco-diff-container,
#monaco-editor-container {
    flex: 1;
    border-radius: var(--dt-radius-sm);
    overflow: hidden;
    min-height: 0;
}

/* ========== ABOUT PAGE ========== */
.dt-about-container {
    max-width: 400px;
    margin: 0 auto;
    padding: var(--dt-spacing-xl);
    text-align: center;
}

.dt-about-card {
    padding: var(--dt-spacing-xl) 0;
}

.dt-about-title {
    margin: 0 0 var(--dt-spacing-sm) 0;
    font-size: 24px;
    font-weight: var(--dt-font-weight-semibold);
    color: var(--dt-text-primary);
}

.dt-about-subtitle {
    margin: 0;
    font-size: var(--dt-font-size-body);
    color: var(--dt-text-secondary);
}

.dt-about-section {
    margin-bottom: var(--dt-spacing-xl);
}

.dt-about-text {
    color: var(--dt-text-secondary);
    font-size: var(--dt-font-size-body);
    line-height: 1.5;
}

.dt-about-text a {
    color: var(--dt-accent);
    text-decoration: none;
}

.dt-about-text a:hover {
    text-decoration: underline;
}

.dt-about-footer {
    padding-top: var(--dt-spacing-lg);
}

.dt-about-footer p {
    margin: 0;
    font-size: var(--dt-font-size-caption);
    color: var(--dt-text-tertiary);
}

/* ========== THEME TOGGLE ICON ========== */
.dt-icon.dark-theme-icon-24 {
    background-image: var(--dt-icon-theme-24);
    background-position: center;
    background-repeat: no-repeat;
    background-size: 20px 20px;
    width: 24px;
    height: 24px;
    opacity: 0.85;
    transition: opacity var(--dt-transition-fast);
}

.dt-icon.dark-theme-icon-24:hover {
    opacity: 1;
}

/* ========== LOADING TERMINAL ========== */
.dt-loader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dt-bg-solid);
    z-index: 9999;
}

.dt-loader-terminal {
    width: 90%;
    max-width: 500px;
    background: #1e1e1e;
    border-radius: var(--dt-radius-lg);
    padding: var(--dt-spacing-md);
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    color: #ccc;
    box-shadow: var(--dt-shadow-md);
}

.dt-loader-terminal-header {
    color: #888;
    margin-bottom: var(--dt-spacing-sm);
    padding-bottom: var(--dt-spacing-xs);
    border-bottom: 1px solid #333;
}

.dt-loader-log {
    min-height: 100px;
    max-height: 200px;
    overflow-y: auto;
}

.dt-loader-log-entry {
    padding: 2px 0;
    display: flex;
    align-items: flex-start;
}

.dt-loader-log-entry::before {
    content: '›';
    color: #4a9eff;
    margin-right: 8px;
    flex-shrink: 0;
}

.dt-loader-log-entry.success { color: #4ec9b0; }
.dt-loader-log-entry.success::before { content: '✓'; color: #4ec9b0; }
.dt-loader-log-entry.error { color: #f44; }
.dt-loader-log-entry.error::before { content: '✗'; color: #f44; }
.dt-loader-log-entry.loading::after {
    content: '...';
    animation: dt-dots 1s steps(4, end) infinite;
}

@keyframes dt-dots {
    0%, 20% { content: ''; }
    40% { content: '.'; }
    60% { content: '..'; }
    80%, 100% { content: '...'; }
}

.dt-main-container[style*="flex"] ~ .dt-loader {
    display: none;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 600px) {
    body {
        padding: var(--dt-spacing-sm);
    }

    ul.dt-tab-bar {
        padding: 0 var(--dt-spacing-sm);
    }

    ul.dt-tab-bar li a {
        padding: var(--dt-spacing-sm) var(--dt-spacing-md);
        font-size: var(--dt-font-size-caption);
    }

    .dt-tab-content {
        padding: var(--dt-spacing-sm);
    }

    /* Mobile toolbar adjustments */
    .dt-toolbar {
        gap: var(--dt-spacing-sm);
    }

    .dt-toolbar-btn {
        height: 36px;
        padding: 0 var(--dt-spacing-sm);
    }

    /* Hide text labels on mobile, show only icons */
    .dt-toolbar-btn span {
        display: none;
    }

    .dt-toolbar-select {
        height: 36px;
        min-width: 90px;
        font-size: 13px;
    }

    .dt-toolbar-divider {
        display: none;
    }
}

/* Very small screens */
@media (max-width: 400px) {
    .dt-toolbar-group-segmented {
        gap: var(--dt-spacing-xs);
    }

    .dt-toolbar-group-segmented .dt-toolbar-btn {
        border-radius: var(--dt-radius-sm);
        margin-left: 0;
    }
}