/* =================================
   utsushi - Text Diff Tool Styles
   ================================= */

:root {
    /* Colors - Light Theme (Default) */
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #eaeef2;
    --bg-hover: #f3f4f6;

    --text-primary: #24292f;
    --text-secondary: #57606a;
    --text-muted: #6e7781;

    --border-primary: #d0d7de;
    --border-secondary: #d8dee4;

    /* Accent Colors */
    --accent-primary: #0969da;
    --accent-secondary: #2188ff;
    --accent-glow: rgba(9, 105, 218, 0.15);

    /* Diff Colors */
    --diff-added-bg: #e6ffec;
    --diff-added-border: #acf2bd;
    --diff-added-text: #1a7f37;

    --diff-removed-bg: #ffebe9;
    --diff-removed-border: #ffc1c0;
    --diff-removed-text: #cf222e;

    --diff-changed-bg: #fff8c5;
    --diff-changed-border: #fbe691;
    --diff-changed-text: #9a6700;

    /* Typography */
    --font-sans: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Consolas', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* Dark Theme Overrides */
[data-theme="dark"] {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-hover: #30363d;

    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;

    --border-primary: #30363d;
    --border-secondary: #21262d;

    --accent-primary: #58a6ff;
    --accent-secondary: #1f6feb;
    --accent-glow: rgba(88, 166, 255, 0.15);

    --diff-added-bg: rgba(46, 160, 67, 0.15);
    --diff-added-border: #238636;
    --diff-added-text: #7ee787;

    --diff-removed-bg: rgba(248, 81, 73, 0.15);
    --diff-removed-border: #da3633;
    --diff-removed-text: #ffa198;

    --diff-changed-bg: rgba(210, 153, 34, 0.15);
    --diff-changed-border: #9e6a03;
    --diff-changed-text: #e3b341;
}

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Header */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
    padding: var(--space-md) var(--space-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-content {
    display: flex;
    align-items: baseline;
    gap: var(--space-lg);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    object-fit: contain;
}

.tagline {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Theme Toggle Button */
.btn-theme-toggle {
    background: transparent;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--space-xs) var(--space-sm);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
}

.btn-theme-toggle:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

.theme-icon {
    font-size: 1rem;
    line-height: 1;
}

/* Main Container */
.main-container {
    flex: 1;
    padding: var(--space-xl);
    max-width: 1800px;
    margin: 0 auto;
    width: 100%;
}

/* Input Section */
.input-section {
    margin-bottom: var(--space-2xl);
}

.input-panels {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.input-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: border-color var(--transition-fast), background-color var(--transition-normal);
}

.input-panel:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-primary);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.panel-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.label-badge {
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-transform: uppercase;
}

.label-badge.base {
    background: var(--accent-secondary);
    color: white;
}

.label-badge.compare {
    background: var(--bg-hover);
    color: var(--text-secondary);
}

.btn-clear {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

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

.text-input {
    flex: 1;
    min-height: 200px;
    padding: var(--space-md);
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.5;
    resize: vertical;
}

.text-input:focus {
    outline: none;
}

.text-input::placeholder {
    color: var(--text-muted);
}

.panel-footer {
    padding: var(--space-xs) var(--space-md);
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-primary);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.char-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    flex-wrap: wrap;
}

.count-item {
    display: inline-flex;
    align-items: center;
    gap: 2px;
}

.count-value {
    font-family: var(--font-mono);
    font-weight: 500;
    color: var(--text-secondary);
}

.count-separator {
    color: var(--border-primary);
    margin: 0 2px;
}

/* Panel Actions */
.panel-actions {
    display: flex;
    gap: var(--space-xs);
}

.btn-remove-panel {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    font-size: 0.8rem;
}

.btn-remove-panel:hover {
    background: var(--diff-removed-bg);
    color: var(--diff-removed-text);
}

/* Add Panel Button - Compact */
.add-panel-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80px;
    background: var(--bg-secondary);
    border: 1px dashed var(--border-primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    padding: var(--space-sm);
}

.add-panel-container:hover {
    border-color: var(--accent-primary);
    background: var(--accent-glow);
}

.btn-add-panel {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.8rem;
}

.btn-add-panel:hover {
    color: var(--accent-primary);
}

.add-icon {
    font-size: 1rem;
    font-weight: 500;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid currentColor;
    border-radius: 50%;
}

.add-text {
    font-size: 0.75rem;
}

/* Action Bar */
.action-bar {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
}

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-xl);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(88, 166, 255, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-primary);
}

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

.btn-icon {
    font-size: 1.2rem;
}

/* Results Section */
.results-section {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-section.hidden {
    display: none;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--border-primary);
}

.results-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.legend {
    display: flex;
    gap: var(--space-lg);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 2px;
}

.legend-item.added .legend-color {
    background: var(--diff-added-bg);
    border: 1px solid var(--diff-added-border);
}

.legend-item.removed .legend-color {
    background: var(--diff-removed-bg);
    border: 1px solid var(--diff-removed-border);
}

.legend-item.changed .legend-color {
    background: var(--diff-changed-bg);
    border: 1px solid var(--diff-changed-border);
}

/* Diff Container */
.diff-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.diff-pair {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.diff-pair.hidden {
    display: none;
}

.diff-pair-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-primary);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.diff-pair-title {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.diff-stats {
    display: flex;
    gap: var(--space-md);
    font-size: 0.8rem;
}

.diff-stats .stat {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.diff-stats .stat.added {
    color: var(--diff-added-text);
}

.diff-stats .stat.removed {
    color: var(--diff-removed-text);
}

.diff-stats .stat.changed {
    color: var(--diff-changed-text);
}

.diff-panels {
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.diff-panel {
    display: flex;
    flex-direction: column;
}

.diff-panel[data-side="left"] {
    border-right: 1px solid var(--border-primary);
}

.diff-panel-header {
    padding: var(--space-xs) var(--space-md);
    background: var(--bg-tertiary);
    font-size: 0.8rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-secondary);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.diff-content {
    padding: 0;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
    overflow-x: auto;
    max-height: 500px;
    overflow-y: auto;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Diff Lines */
.diff-line {
    display: flex;
    min-height: 1.6em;
    border-bottom: 1px solid var(--border-secondary);
}

.diff-line:last-child {
    border-bottom: none;
}

.line-number {
    min-width: 50px;
    padding: 0 var(--space-sm);
    text-align: right;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    border-right: 1px solid var(--border-primary);
    user-select: none;
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.line-content {
    flex: 1;
    padding: 0 var(--space-md);
    white-space: pre-wrap;
    word-break: break-all;
}

/* Diff Line Types */
.diff-line.added {
    background: var(--diff-added-bg);
}

.diff-line.added .line-content {
    color: var(--diff-added-text);
}

.diff-line.removed {
    background: var(--diff-removed-bg);
}

.diff-line.removed .line-content {
    color: var(--diff-removed-text);
}

.diff-line.changed {
    background: var(--diff-changed-bg);
}

.diff-line.changed .line-content {
    color: var(--diff-changed-text);
}

/* Word-level diff highlights */
.word-added {
    background: rgba(46, 160, 67, 0.4);
    color: inherit;
    border-radius: 3px;
    padding: 0 2px;
    font-weight: 500;
}

[data-theme="dark"] .word-added {
    background: rgba(46, 160, 67, 0.6);
    color: #ffffff;
}

.word-removed {
    background: rgba(248, 81, 73, 0.4);
    color: inherit;
    border-radius: 3px;
    padding: 0 2px;
    text-decoration: line-through;
    font-weight: 500;
}

[data-theme="dark"] .word-removed {
    background: rgba(248, 81, 73, 0.6);
    color: #ffffff;
}

/* Empty state */
.diff-empty {
    padding: var(--space-xl);
    text-align: center;
    color: var(--text-muted);
}

/* Footer - Compact with collapsible privacy */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    padding: var(--space-md) var(--space-xl);
    margin-top: auto;
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

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

.footer-info {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.footer-separator {
    color: var(--border-primary);
}

.btn-privacy-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    background: transparent;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.toggle-icon {
    font-size: 0.6rem;
    transition: transform var(--transition-fast);
}

.btn-privacy-toggle.active .toggle-icon {
    transform: rotate(180deg);
}

.privacy-details {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-secondary);
    animation: slideDown 0.2s ease;
}

.privacy-details.hidden {
    display: none;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.privacy-details ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.privacy-details li {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 12px;
    pointer-events: none;
    /* コンテナ自体はクリックを透過 */
}

.toast {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    color: var(--text-primary);
    padding: 12px 20px;
    border-radius: var(--radius-md);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    max-width: 350px;
    pointer-events: auto;
    /* トースト自体はクリック可能 */
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast.error {
    border-left: 4px solid var(--diff-removed-border);
}

.toast.info {
    border-left: 4px solid var(--accent-primary);
}

.toast.success {
    border-left: 4px solid var(--diff-added-border);
}

/* Responsive */
@media (max-width: 1200px) {
    .input-panels {
        grid-template-columns: 1fr;
    }

    .text-input {
        min-height: 150px;
    }
}

@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: var(--space-md);
        padding: var(--space-md);
    }

    .header-content {
        flex-direction: column;
        align-items: center;
        gap: var(--space-xs);
    }

    .btn-theme-toggle {
        position: absolute;
        top: var(--space-md);
        right: var(--space-md);
    }

    .main-container {
        padding: var(--space-md);
    }

    .diff-panels {
        grid-template-columns: 1fr;
    }

    .diff-panel[data-side="left"] {
        border-right: none;
        border-bottom: 1px solid var(--border-primary);
    }

    .footer-content {
        flex-direction: column;
        gap: var(--space-lg);
    }

    .footer-info {
        text-align: left;
    }

    .toast-container {
        left: 20px;
        right: 20px;
        bottom: 20px;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}