/* =================================
   nitsuke - Character Encoding Converter Styles
   ================================= */

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-primary);
    color: white;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 500;
    z-index: 9999;
    transition: top 0.2s ease;
}

.skip-link:focus {
    top: var(--space-md);
    outline: 2px solid white;
    outline-offset: 2px;
}

: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: #8250df;
    --accent-secondary: #a371f7;
    --accent-glow: rgba(130, 80, 223, 0.15);

    /* Status Colors */
    --success-bg: #e6ffec;
    --success-border: #acf2bd;
    --success-text: #1a7f37;

    --warning-bg: #fff8c5;
    --warning-border: #fbe691;
    --warning-text: #9a6700;

    --error-bg: #ffebe9;
    --error-border: #ffc1c0;
    --error-text: #cf222e;

    /* 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;
    --radius-xl: 16px;

    /* 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: #a371f7;
    --accent-secondary: #8250df;
    --accent-glow: rgba(163, 113, 247, 0.15);

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

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

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

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

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);
}

body.modal-open {
    overflow: hidden;
}

/* 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: center;
    gap: var(--space-lg);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.logo-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    color: inherit;
    text-decoration: none;
}

.logo-icon {
    width: 28px;
    height: 28px;
    display: inline-block;
    border-radius: 6px;
    object-fit: contain;
}

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

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.btn-theme-toggle,
.btn-lang-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: var(--space-xs) var(--space-sm);
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-primary);
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
    min-width: 40px;
    min-height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-theme-toggle:hover,
.btn-lang-toggle:hover {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
}

.btn-theme-toggle:focus-visible,
.btn-lang-toggle:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

.lang-icon {
    font-weight: 700;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

/* Main Content */
.main-container {
    flex: 1;
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
    padding: var(--space-xl);
    position: relative;
}

/* Intro Section */
.intro-section {
    margin-bottom: var(--space-xl);
}

.intro-text {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    font-size: 0.95rem;
}

.feature-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm) var(--space-lg);
}

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

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

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
    position: relative;
}

.drop-zone:hover,
.drop-zone:focus-visible {
    border-color: var(--accent-primary);
    background: var(--accent-glow);
}

.drop-zone.drag-over {
    border-color: var(--accent-primary);
    background: var(--accent-glow);
    border-style: solid;
}

.drop-zone:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

.drop-zone-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: var(--space-sm);
}

.drop-zone-text {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.drop-zone-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.file-input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

/* Info Panel */
.info-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin-top: var(--space-md);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.info-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-sm) var(--space-lg);
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.info-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

.info-value {
    font-size: 0.9rem;
    color: var(--text-primary);
    font-family: var(--font-mono);
    word-break: break-all;
}

/* Settings Section */
.settings-section {
    margin-bottom: var(--space-xl);
}

.section-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.settings-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

/* Select Input */
.select-wrapper {
    position: relative;
    margin-bottom: var(--space-sm);
}

.select-input {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    cursor: pointer;
    transition: border-color var(--transition-fast);
    appearance: auto;
}

.select-input:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
    border-color: var(--accent-primary);
}

.control-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: var(--space-xs);
}

/* Option Groups */
.option-group {
    margin-bottom: var(--space-md);
}

.option-group:last-child {
    margin-bottom: 0;
}

.option-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.option-detail {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.radio-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-primary);
    transition: background-color var(--transition-fast);
}

.radio-label:hover {
    background: var(--bg-hover);
}

.radio-label input[type="radio"] {
    accent-color: var(--accent-primary);
    margin: 0;
}

/* Preview Section */
.preview-section {
    margin-bottom: var(--space-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.preview-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.preview-card {
    display: flex;
    flex-direction: column;
}

.preview-card-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.preview-text {
    background: var(--bg-primary);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--text-primary);
    overflow: auto;
    max-height: 300px;
    white-space: pre-wrap;
    word-break: break-all;
    tab-size: 4;
}

.preview-truncated-notice {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: var(--space-sm);
    font-style: italic;
}

/* Action Bar */
.action-bar {
    display: flex;
    gap: var(--space-md);
    align-items: center;
    margin-top: var(--space-lg);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-xl);
    background: var(--accent-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-fast), opacity var(--transition-fast);
    font-family: var(--font-sans);
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-secondary);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    cursor: pointer;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
    font-family: var(--font-sans);
}

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

.btn-secondary:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Result Section */
.result-section {
    margin-bottom: var(--space-xl);
}

.result-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin-bottom: var(--space-lg);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.result-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.result-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

.result-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: var(--font-mono);
}

/* Download Bar */
.download-bar {
    display: flex;
    justify-content: center;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-2xl);
    background: var(--success-text);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: opacity var(--transition-fast);
    font-family: var(--font-sans);
}

.btn-download:hover {
    opacity: 0.9;
}

.btn-download:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Processing Overlay */
.processing-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.processing-content {
    background: var(--bg-primary);
    padding: var(--space-xl) var(--space-2xl);
    border-radius: var(--radius-lg);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-primary);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.processing-text {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    padding: var(--space-md) var(--space-xl);
    font-size: 0.8rem;
    color: var(--text-muted);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-content {
    max-width: 900px;
    margin: 0 auto;
}

.footer-main {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-md);
}

.footer-info {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-xs);
}

.footer-separator {
    color: var(--border-primary);
    margin: 0 var(--space-xs);
}

.btn-footer-link {
    background: none;
    border: none;
    color: var(--accent-primary);
    cursor: pointer;
    font-size: inherit;
    font-family: inherit;
    padding: 0;
    text-decoration: none;
}

.btn-footer-link:hover {
    text-decoration: underline;
}

.btn-inline-link {
    background: none;
    border: none;
    color: var(--accent-primary);
    cursor: pointer;
    font-size: inherit;
    font-family: inherit;
    padding: 0;
    text-decoration: underline;
}

/* Privacy Toggle */
.btn-privacy-toggle {
    background: none;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: var(--space-xs) var(--space-sm);
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.8rem;
    font-family: var(--font-sans);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    white-space: nowrap;
    transition: background-color var(--transition-fast);
}

.btn-privacy-toggle:hover {
    background: var(--bg-hover);
}

.toggle-icon {
    font-size: 0.65rem;
    transition: transform var(--transition-fast);
}

.btn-privacy-toggle:not(.active) .toggle-icon {
    transform: rotate(-90deg);
}

.privacy-details {
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--border-secondary);
}

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

.privacy-details ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs) var(--space-lg);
}

.privacy-details li {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
}

.modal[hidden] {
    display: none;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
}

.modal-content {
    position: relative;
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    max-width: 640px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-primary);
    position: sticky;
    top: 0;
    background: var(--bg-primary);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.btn-modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--space-xs);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

.btn-modal-close:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

.modal-body {
    padding: var(--space-lg);
}

.policy-section {
    margin-bottom: var(--space-lg);
}

.policy-section:last-child {
    margin-bottom: 0;
}

.policy-section h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.policy-section p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
    line-height: 1.7;
}

.policy-section ul {
    list-style: none;
    padding-left: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.policy-section li {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
    line-height: 1.6;
}

.policy-notice {
    background: var(--warning-bg);
    border: 1px solid var(--warning-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-top: var(--space-md);
}

.policy-notice p {
    color: var(--warning-text);
}

.policy-date {
    font-style: italic;
    color: var(--text-muted) !important;
}

/* Toast Container */
.toast-container {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    opacity: 0;
    transform: translateX(100%);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
    pointer-events: auto;
}

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

.toast-hide {
    opacity: 0;
    transform: translateX(100%);
}

.toast-success {
    background: var(--success-bg);
    border: 1px solid var(--success-border);
    color: var(--success-text);
}

.toast-error {
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    color: var(--error-text);
}

.toast-warning {
    background: var(--warning-bg);
    border: 1px solid var(--warning-border);
    color: var(--warning-text);
}

/* Hidden utility */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        padding: var(--space-sm) var(--space-md);
        flex-wrap: wrap;
        gap: var(--space-sm);
    }

    .header-content {
        gap: var(--space-sm);
    }

    .tagline {
        display: none;
    }

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

    .feature-list {
        flex-direction: column;
        gap: var(--space-xs);
    }

    .settings-grid {
        grid-template-columns: 1fr;
    }

    .preview-grid {
        grid-template-columns: 1fr;
    }

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

    .footer-main {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-info {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-separator {
        display: none;
    }

    .toast-container {
        bottom: var(--space-md);
        right: var(--space-md);
        left: var(--space-md);
    }

    .drop-zone {
        padding: var(--space-xl);
    }

    .action-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-primary,
    .btn-secondary {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .result-info-grid {
        grid-template-columns: 1fr;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }
}