/**
 * GPG Signature Verifier Styles
 * Modern, accessible, security-focused design
 *
 * @version 4.0.1
 */

/* ============================================================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   ============================================================================ */

:root {
    color-scheme: light;
    /* Colors - Brand */
    --color-primary: #667eea;
    --color-primary-dark: #764ba2;
    --color-secondary: #48bb78;
    --color-secondary-dark: #38a169;

    /* Colors - Semantic */
    --color-success: #48bb78;
    --color-success-light: #f0fff4;
    --color-success-dark: #22543d;
    --color-error: #fc8181;
    --color-error-light: #fff5f5;
    --color-error-dark: #742a2a;
    --color-warning: #ed8936;
    --color-info: #4299e1;
    --color-info-light: #ebf8ff;
    --color-info-dark: #2c5282;

    /* Colors - Neutrals */
    --color-gray-50: #f7fafc;
    --color-gray-100: #edf2f7;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e0;
    --color-gray-400: #a0aec0;
    --color-gray-500: #718096;
    --color-gray-600: #4a5568;
    --color-gray-700: #2d3748;
    --color-gray-800: #1a202c;
    --color-gray-900: #171923;

    /* Colors - Background */
    --color-bg-gradient-start: #667eea;
    --color-bg-gradient-end: #764ba2;
    --color-bg-header-start: #2d3748;
    --color-bg-header-end: #1a202c;
    --color-surface: #ffffff;
    --color-surface-strong: #ffffff;
    --color-surface-soft: #f7fafc;
    --color-surface-muted: rgba(102, 126, 234, 0.08);
    --color-border: rgba(203, 213, 224, 0.4);
    --color-text: #2d3748;
    --color-text-muted: #4a5568;
    --color-on-accent: #ffffff;
    --color-reset-btn-start: #4a5568;
    --color-reset-btn-end: #2d3748;
    --color-reset-btn-text: #ffffff;
    --color-reset-btn-hover-start: #2d3748;
    --color-reset-btn-hover-end: #1a202c;
    --color-reset-btn-disabled-start: #a0aec0;
    --color-reset-btn-disabled-end: #718096;
    --color-reset-btn-shadow: rgba(74, 85, 104, 0.3);
    --color-reset-btn-hover-shadow: rgba(74, 85, 104, 0.4);

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 20px;
    --spacing-lg: 30px;
    --spacing-xl: 40px;

    /* Typography */
    --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-family-heading: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-family-mono: 'Courier New', 'Monaco', 'Menlo', monospace;
    --font-size-xs: 0.85em;
    --font-size-sm: 0.9em;
    --font-size-base: 1em;
    --font-size-lg: 1.1em;
    --font-size-xl: 1.3em;
    --font-size-2xl: 2em;
    --font-size-3xl: 2.5em;
    --line-height-tight: 1.4;
    --line-height-base: 1.6;
    --line-height-relaxed: 1.8;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 15px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.3);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

[data-theme="dark"] {
    color-scheme: dark;
    --color-primary: #667eea;
    --color-primary-dark: #8fa0f5;
    --color-secondary: #48bb78;
    --color-secondary-dark: #7fd9a2;
    --color-success-light: #163226;
    --color-success-dark: #d2ffe2;
    --color-error: #fc8181;
    --color-error-light: #3b1b1b;
    --color-error-dark: #ffd0d0;
    --color-warning: #ed8936;
    --color-info: #63b3ed;
    --color-info-light: #17283d;
    --color-info-dark: #d8ecff;
    --color-gray-50: #111827;
    --color-gray-100: #1f2937;
    --color-gray-200: #2d3748;
    --color-gray-300: #4a5568;
    --color-gray-400: #718096;
    --color-gray-500: #a0aec0;
    --color-gray-600: #cbd5e0;
    --color-gray-700: #edf2f7;
    --color-gray-800: #f7fafc;
    --color-gray-900: #ffffff;
    --color-bg-gradient-start: #2d3748;
    --color-bg-gradient-end: #1a202c;
    --color-bg-header-start: #2d3748;
    --color-bg-header-end: #1a202c;
    --color-surface: #1a202c;
    --color-surface-strong: #2d3748;
    --color-surface-soft: #243042;
    --color-surface-muted: rgba(102, 126, 234, 0.16);
    --color-border: rgba(203, 213, 224, 0.12);
    --color-text: #edf2f7;
    --color-text-muted: #cbd5e0;
    --color-on-accent: #ffffff;
    --color-reset-btn-start: #edf2f7;
    --color-reset-btn-end: #cbd5e0;
    --color-reset-btn-text: #1a202c;
    --color-reset-btn-hover-start: #f7fafc;
    --color-reset-btn-hover-end: #edf2f7;
    --color-reset-btn-disabled-start: #718096;
    --color-reset-btn-disabled-end: #a0aec0;
    --color-reset-btn-shadow: rgba(203, 213, 224, 0.18);
    --color-reset-btn-hover-shadow: rgba(237, 242, 247, 0.24);
}

/* ============================================================================
   RESET & BASE STYLES
   ============================================================================ */

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

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background: linear-gradient(135deg, var(--color-bg-gradient-start) 0%, var(--color-bg-gradient-end) 100%);
    min-height: 100vh;
    padding: var(--spacing-md);
}

/* ============================================================================
   LAYOUT
   ============================================================================ */

.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

/* ============================================================================
   HEADER
   ============================================================================ */

header {
    background: linear-gradient(135deg, var(--color-bg-header-start) 0%, var(--color-bg-header-end) 100%);
    color: var(--color-on-accent);
    padding: var(--spacing-xl);
    text-align: center;
}

.header-toolbar {
    display: flex;
    justify-content: flex-end;
    margin-bottom: var(--spacing-md);
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(255, 255, 255, 0.18);
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-on-accent);
    cursor: pointer;
    font: inherit;
    font-size: var(--font-size-sm);
    font-weight: 600;
    transition: all var(--transition-base);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.18);
    transform: scale(1.02);
}

header h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: 10px;
}

header h1 .icon {
    display: inline-block;
    margin-right: 10px;
}

.subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.security-notice {
    background: rgba(72, 187, 120, 0.2);
    border: 2px solid var(--color-success);
    border-radius: var(--radius-lg);
    padding: 15px;
    margin-top: var(--spacing-md);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-base);
}

.security-notice strong {
    color: var(--color-success);
}

/* ============================================================================
   MAIN CONTENT
   ============================================================================ */

main {
    padding: var(--spacing-xl);
}

.app-status {
    display: grid;
    gap: 10px;
    margin-bottom: var(--spacing-lg);
    padding: 16px 18px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--color-surface-strong) 0%, var(--color-surface-soft) 100%);
}

.app-status-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: fit-content;
    padding: 6px 10px;
    border-radius: var(--radius-full);
    background: var(--color-surface-muted);
    color: var(--color-primary-dark);
    font-size: var(--font-size-xs);
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.app-status-detail {
    color: var(--color-text);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* ============================================================================
   INPUT SECTIONS
   ============================================================================ */

.input-section {
    margin-bottom: var(--spacing-lg);
}

.section-heading {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    font-family: var(--font-family-heading);
}

/* Collapsible Section Styles */
.collapsible-header {
    cursor: pointer;
    user-select: none;
    transition: all var(--transition-base);
    position: relative;
}

.collapsible-header:hover {
    color: var(--color-primary);
}

.collapsible-header:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

.collapse-icon {
    margin-left: auto;
    font-size: var(--font-size-sm);
    transition: transform var(--transition-base);
}

.collapsible.collapsed .collapse-icon {
    transform: rotate(-90deg);
}

.collapsible-content {
    max-height: 2000px;
    overflow: hidden;
    opacity: 1;
    transition: max-height var(--transition-slow), opacity var(--transition-base);
}

.collapsible.collapsed .collapsible-content {
    max-height: 0;
    opacity: 0;
}

.collapsed-summary {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-success-light);
    border-left: 4px solid var(--color-success);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    color: var(--color-success-dark);
    font-weight: 600;
    display: none;
    font-size: var(--font-size-base);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.collapsible.collapsed .collapsed-summary {
    display: block !important;
}

.collapsed-summary::before {
    content: "✓ ";
    color: var(--color-success);
    font-weight: bold;
    margin-right: 4px;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    border-radius: var(--radius-full);
    font-size: var(--font-size-base);
    font-weight: 700;
}

.input-group {
    border: 2px dashed var(--color-gray-300);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    transition: all var(--transition-base);
}

.input-group:hover {
    border-color: var(--color-primary);
    background: var(--color-gray-50);
}

.input-option {
    margin-bottom: var(--spacing-md);
}

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

/* Detached Data File Wrapper */
.detached-data-wrapper {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-info-light);
    border-left: 4px solid var(--color-info);
    border-radius: var(--radius-md);
    animation: slideIn 0.3s ease;
}

.detached-data-wrapper .input-label {
    color: var(--color-gray-800);
}

.input-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--color-gray-700);
}

.file-types {
    font-size: var(--font-size-xs);
    color: var(--color-gray-500);
    font-weight: 400;
}

/* ============================================================================
   URL INPUT & FETCH
   ============================================================================ */

.url-input-wrapper {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

input[type="url"] {
    flex: 1;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-family: var(--font-family-base);
    transition: all var(--transition-base);
}

input[type="url"]:hover {
    border-color: var(--color-primary);
}

input[type="url"]:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

input[type="url"]::placeholder {
    color: var(--color-gray-400);
}

.fetch-btn {
    background: linear-gradient(135deg, var(--color-success) 0%, var(--color-success-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: 600;
    white-space: nowrap;
    transition: all var(--transition-base);
}

.fetch-btn:hover:not(:disabled) {
    transform: scale(1.05);
    box-shadow: var(--shadow-sm);
}

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

.fetch-feedback {
    margin: 10px 0;
    padding: 10px 15px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-base);
    white-space: pre-line;
    display: none;
    animation: slideIn 0.3s ease;
}

.fetch-feedback.show {
    display: block;
}

.fetch-feedback.success {
    background: var(--color-success-light);
    border: 1px solid var(--color-success);
    color: var(--color-success-dark);
}

.fetch-feedback.error {
    background: var(--color-error-light);
    border: 1px solid var(--color-error);
    color: var(--color-error-dark);
    text-align: left;
    font-weight: 500;
}

.fetch-feedback.loading {
    background: var(--color-info-light);
    border: 1px solid var(--color-info);
    color: #2c5282;
}

.hint-text {
    margin: var(--spacing-xs) 0;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-surface-soft);
    border-left: 3px solid var(--color-info);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    line-height: var(--line-height-base);
}

.hint-text strong {
    color: var(--color-gray-700);
}

/* ============================================================================
   FILE INPUT
   ============================================================================ */

.file-input-wrapper {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

input[type="file"] {
    flex: 1;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-family: var(--font-family-base);
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--color-surface-strong);
    color: var(--color-text);
}

input[type="file"]:hover {
    border-color: var(--color-primary);
}

input[type="file"]:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.file-info {
    font-size: var(--font-size-sm);
    color: var(--color-success);
    margin-top: 10px;
    padding: var(--spacing-xs);
    background: var(--color-success-light);
    border-radius: var(--radius-sm);
    display: none;
    white-space: pre-line;
    word-break: break-word;
    line-height: var(--line-height-base);
}

.file-info.show {
    display: block;
}

/* ============================================================================
   TEXTAREA
   ============================================================================ */

textarea {
    width: 100%;
    min-height: 120px;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-family: var(--font-family-mono);
    font-size: var(--font-size-xs);
    line-height: var(--line-height-base);
    resize: vertical;
    transition: all var(--transition-base);
    background: var(--color-surface-strong);
    color: var(--color-text);
}

textarea:hover {
    border-color: var(--color-primary);
}

textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

textarea::placeholder {
    color: var(--color-gray-400);
}

/* ============================================================================
   BUTTONS
   ============================================================================ */

.clear-btn {
    background: var(--color-error);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    font-size: var(--font-size-base);
    font-weight: 600;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.clear-btn:hover {
    background: #f56565;
    transform: scale(1.05);
}

/* ============================================================================
   FORMAT INFO
   ============================================================================ */

.format-info {
    margin-top: 15px;
    padding: 15px;
    background: var(--color-surface-soft);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-sm);
}

.format-heading {
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-base);
    font-weight: 600;
}

.format-heading.collapsible-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0;
}

.format-info.collapsed .format-heading.collapsible-header {
    margin-bottom: 0;
}

.format-info .collapsible-content {
    margin-top: var(--spacing-sm);
}

.format-list {
    margin-top: var(--spacing-xs);
}

.format-list dt {
    font-weight: 600;
    color: var(--color-primary);
    margin-top: var(--spacing-xs);
}

.format-list dd {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray-600);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-base);
}

.format-list code {
    background: var(--color-gray-100);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: var(--font-family-mono);
    font-size: var(--font-size-xs);
}

/* ============================================================================
   ACTION SECTION
   ============================================================================ */

.action-section {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
    flex-wrap: wrap;
}

.verify-btn {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    padding: 18px 60px;
    font-size: 1.2em;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.reset-btn {
    background: linear-gradient(135deg, var(--color-reset-btn-start) 0%, var(--color-reset-btn-end) 100%);
    color: var(--color-reset-btn-text);
    border: none;
    border-radius: var(--radius-lg);
    padding: 18px 40px;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 4px 15px var(--color-reset-btn-shadow);
}

.reset-btn:hover {
    background: linear-gradient(135deg, var(--color-reset-btn-hover-start) 0%, var(--color-reset-btn-hover-end) 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--color-reset-btn-hover-shadow);
}

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

.reset-btn:disabled {
    background: linear-gradient(135deg, var(--color-reset-btn-disabled-start) 0%, var(--color-reset-btn-disabled-end) 100%);
    color: var(--color-reset-btn-text);
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Stop button styling (when verification is running) */
.stop-btn {
    background: linear-gradient(135deg, var(--color-error) 0%, #c53030 100%);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    padding: 15px 30px;
    font-size: 1.05em;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 4px 15px rgba(229, 62, 62, 0.3);
}

.reset-btn.stop-btn {
    background: linear-gradient(135deg, var(--color-error) 0%, #c53030 100%);
    box-shadow: 0 4px 15px rgba(229, 62, 62, 0.3);
}

.stop-btn:hover:not(:disabled),
.reset-btn.stop-btn:hover {
    background: linear-gradient(135deg, #c53030 0%, #9b2c2c 100%);
    box-shadow: 0 6px 20px rgba(229, 62, 62, 0.4);
    transform: translateY(-2px);
}

.stop-btn:active,
.reset-btn.stop-btn:active {
    transform: translateY(0);
}

.stop-btn:disabled {
    background: linear-gradient(135deg, #c53030 0%, #9b2c2c 100%);
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.verify-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.verify-btn:active:not(:disabled) {
    transform: translateY(0);
}

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

/* ============================================================================
   PROGRESS BAR
   ============================================================================ */

.progress-container {
    margin: var(--spacing-lg) 0;
}

.progress-bar {
    width: 100%;
    height: 30px;
    background: var(--color-gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    width: 0%;
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
}

.progress-text {
    text-align: center;
    margin-top: 10px;
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    font-weight: 500;
}

/* ============================================================================
   RESULTS
   ============================================================================ */

/* ============================================================================
   INLINE ERRORS
   ============================================================================ */

.inline-error {
    display: none;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    background: var(--color-error-light);
    border-left: 4px solid var(--color-error);
    border-radius: var(--radius-md);
    color: var(--color-error-dark);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-base);
    animation: slideIn 0.3s ease;
}

.inline-error strong {
    display: block;
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-xs);
    color: var(--color-error-dark);
}

/* ============================================================================
   RESULT CONTAINER
   ============================================================================ */

.result-container {
    margin: var(--spacing-lg) 0;
}

.result {
    padding: 25px;
    border-radius: var(--radius-lg);
    text-align: center;
    animation: slideIn 0.4s ease;
}

.result.success {
    background: linear-gradient(135deg, var(--color-success) 0%, var(--color-success-dark) 100%);
    color: white;
    border: 3px solid #22543d;
    box-shadow: 0 8px 25px rgba(72, 187, 120, 0.4);
}

.result.error {
    background: linear-gradient(135deg, var(--color-error) 0%, #f56565 100%);
    color: white;
    border: 3px solid var(--color-error-dark);
    box-shadow: 0 8px 25px rgba(252, 129, 129, 0.4);
}

.result-icon {
    font-size: var(--font-size-2xl);
    margin-bottom: 10px;
}

.result-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: 15px;
}

.result-details {
    margin-top: 15px;
    font-size: var(--font-size-sm);
    font-weight: 400;
    opacity: 0.95;
    padding: 15px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    text-align: left;
}

.result-details strong {
    display: block;
    margin-bottom: 10px;
}

.result-details ul {
    margin: 10px 0 0 20px;
}

.result-details li {
    margin-bottom: 6px;
}

.result-info {
    margin-top: 10px;
}

.result-info dt {
    font-weight: 600;
    margin-top: var(--spacing-xs);
}

.result-info dd {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-family-mono);
}

.result-info code {
    word-break: break-all;
}

.result-message {
    margin-top: 15px;
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.error-detail {
    margin-top: 10px;
    font-size: var(--font-size-xs);
    opacity: 0.8;
}

/* Error message formatting for CLI instructions */
.result-details h3 {
    margin: 0 0 15px 0;
    font-size: 1.2em;
    color: inherit;
}

.result-details h4 {
    margin: 20px 0 10px 0;
    font-size: 1.05em;
    color: inherit;
}

.result-details ol {
    margin: 10px 0;
    padding-left: 25px;
    text-align: left;
}

.result-details ol li {
    margin-bottom: 12px;
    line-height: 1.6;
}

.result-details ul {
    margin: 8px 0;
    padding-left: 20px;
}

.result-details ul li {
    margin-bottom: 5px;
}

.result-details code {
    background: rgba(0, 0, 0, 0.15);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: var(--font-family-mono);
    font-size: 0.9em;
}

.result-details a {
    color: inherit;
    text-decoration: underline;
}

.result-details a:hover {
    opacity: 0.8;
}

/* ============================================================================
   FOOTER
   ============================================================================ */

footer {
    background: var(--color-surface-soft);
    padding: var(--spacing-xl);
    border-top: 1px solid var(--color-gray-200);
}

.info-section h2 {
    color: var(--color-gray-700);
    margin-bottom: 15px;
    font-size: var(--font-size-xl);
}

/* Footer collapsible header styling */
.info-section .collapsible-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 15px;
}

.info-section.collapsed .collapsible-header {
    margin-bottom: 10px;
}

.info-section .collapsed-summary {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    font-style: italic;
    background: transparent;
    border: none;
    padding: 0;
    margin-bottom: 0;
}

.info-section .collapsible-content h2 {
    color: var(--color-gray-700);
    margin-bottom: 15px;
    margin-top: 20px;
    font-size: var(--font-size-lg);
}

.instructions-list,
.features-list {
    margin-left: var(--spacing-md);
    margin-bottom: 25px;
    color: var(--color-text-muted);
}

.instructions-list li,
.features-list li {
    margin-bottom: var(--spacing-xs);
    line-height: var(--line-height-base);
}

.tech-info {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--color-surface-strong);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-primary);
}

.tech-info a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.tech-info a:hover {
    text-decoration: underline;
}

.disclaimer {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--color-info-light);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-info);
}

.disclaimer h3 {
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-lg);
}

.disclaimer p {
    color: var(--color-text-muted);
    line-height: var(--line-height-relaxed);
}

/* ============================================================================
   ANIMATIONS
   ============================================================================ */

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================================================
   RESPONSIVE DESIGN
   ============================================================================ */

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    header h1 {
        font-size: 1.8em;
    }

    main,
    footer {
        padding: var(--spacing-md);
    }

    .verify-btn {
        width: 100%;
        padding: 15px;
    }

    .url-input-wrapper,
    .file-input-wrapper {
        flex-direction: column;
    }

    .fetch-btn,
    .clear-btn {
        width: 100%;
    }
}

/* ============================================================================
   ACCESSIBILITY IMPROVEMENTS
   ============================================================================ */

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Reduced motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-gray-300: #999;
        --color-gray-400: #777;
    }
}

/* ============================================================================
   DOWNLOAD SECTION
   ============================================================================ */

.download-info h3 {
    color: var(--color-primary);
    font-size: var(--font-size-lg);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.download-info h3:first-child {
    margin-top: 0;
}

.download-info p {
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-relaxed);
}

.download-info code {
    background: var(--color-gray-100);
    border: 1px solid var(--color-gray-300);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9em;
    color: var(--color-error-dark);
}

.download-info pre {
    background: var(--color-gray-100);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    overflow-x: auto;
    margin: var(--spacing-md) 0;
}

.download-info pre code {
    background: none;
    border: none;
    padding: 0;
    color: var(--color-text);
    font-size: 0.9em;
    line-height: 1.5;
}

.download-info kbd {
    background: linear-gradient(180deg, #f9f9f9 0%, #e9e9e9 100%);
    border: 1px solid #aaa;
    border-radius: 3px;
    box-shadow: 0 1px 0 rgba(0,0,0,0.2), 0 0 0 2px #fff inset;
    color: #333;
    display: inline-block;
    font-family: Arial, sans-serif;
    font-size: 0.85em;
    font-weight: 600;
    line-height: 1;
    padding: 2px 6px;
    white-space: nowrap;
}

.download-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    flex-wrap: wrap;
}

.download-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--color-primary) 0%, #3182ce 100%);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
    box-shadow: 0 4px 12px rgba(66, 153, 225, 0.3);
    border: none;
    cursor: pointer;
}

.download-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(66, 153, 225, 0.4);
    background: linear-gradient(135deg, #3182ce 0%, var(--color-primary) 100%);
}

.download-button:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(66, 153, 225, 0.3);
}

.download-button-primary {
    background: linear-gradient(135deg, var(--color-success) 0%, var(--color-success-dark) 100%);
    box-shadow: 0 4px 12px rgba(72, 187, 120, 0.4);
    font-size: 1.1em;
    padding: 14px 28px;
}

.download-button-primary:hover {
    background: linear-gradient(135deg, var(--color-success-dark) 0%, var(--color-success) 100%);
    box-shadow: 0 6px 20px rgba(72, 187, 120, 0.5);
}

.download-button.secondary {
    background: linear-gradient(135deg, var(--color-gray-600) 0%, var(--color-gray-700) 100%);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.download-button.secondary:hover {
    background: linear-gradient(135deg, var(--color-gray-700) 0%, var(--color-gray-600) 100%);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.download-note {
    background: var(--color-info-light);
    border-left: 4px solid var(--color-info);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
    font-size: 0.95em;
}

/* ============================================================================
   CHECKSUM VERIFICATION SECTION
   ============================================================================ */

.checksum-container {
    margin: var(--spacing-lg) 0;
    animation: slideIn 0.4s ease;
}

.checksum-section {
    background: var(--color-info-light);
    border: 2px solid var(--color-info);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.checksum-title {
    color: var(--color-primary);
    font-size: var(--font-size-xl);
    margin: 0 0 var(--spacing-md) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.checksum-title .icon {
    font-size: 1.5em;
}

.checksum-intro {
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-base);
}

.checksum-info {
    background: var(--color-surface-strong);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.checksum-algorithm {
    color: var(--color-success-dark);
    font-weight: 600;
    margin: var(--spacing-sm) 0;
}

.checksum-items {
    list-style: none;
    padding: 0;
    margin: var(--spacing-md) 0 0 0;
}

.checksum-item {
    background: var(--color-gray-50);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.checksum-filename {
    font-weight: 600;
    color: var(--color-primary);
    word-break: break-all;
}

.checksum-hash {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.85em;
    color: var(--color-gray-700);
    word-break: break-all;
    background: var(--color-surface-strong);
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-gray-300);
}

/* Verified checksum item styling */
.checksum-item.verified {
    background: #f0fdf4;
    border-color: var(--color-success);
    border-width: 2px;
}

.checksum-verified-icon {
    color: var(--color-success);
    font-weight: bold;
    margin-right: 0.5rem;
}

.checksum-verified-count {
    color: var(--color-success);
    font-weight: 600;
    margin: 0.5rem 0;
    padding: 0.5rem;
    background: #f0fdf4;
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-success);
}

.checksum-upload-section {
    margin-top: var(--spacing-lg);
}

.checksum-queue {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-gray-50);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
}

.checksum-queue-header {
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray-700);
}

.checksum-queue-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    background: var(--color-surface-strong);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-sm);
}

.checksum-queue-item.processing {
    border-color: var(--color-primary);
    background: var(--color-surface-soft);
}

.checksum-queue-item.completed {
    border-color: var(--color-success);
    background: var(--color-success-light);
}

.checksum-queue-item.error {
    border-color: var(--color-error);
    background: var(--color-error-light);
}

.checksum-queue-status {
    flex-shrink: 0;
    font-size: 1.2em;
}

.checksum-queue-filename {
    flex-grow: 1;
    font-weight: 500;
    word-break: break-all;
}

.checksum-queue-size {
    flex-shrink: 0;
    color: var(--color-gray-600);
    font-size: 0.9em;
}

.checksum-result {
    margin-top: var(--spacing-md);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    animation: slideIn 0.4s ease;
}

.checksum-result-icon {
    font-size: 3em;
    margin-bottom: var(--spacing-sm);
}

.checksum-result-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.5px;
}

.checksum-result-details {
    text-align: left;
    max-width: 600px;
    margin: 0 auto;
}

.checksum-result-info {
    margin: var(--spacing-md) 0;
}

.checksum-result-info dt {
    font-weight: 600;
    color: var(--color-gray-700);
    margin-top: var(--spacing-sm);
}

.checksum-result-info dd {
    margin: var(--spacing-xs) 0 0 var(--spacing-md);
    word-break: break-all;
}

.checksum-result-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-md);
    font-weight: 600;
}

.checksum-success {
    background: linear-gradient(135deg, var(--color-success) 0%, var(--color-success-dark) 100%);
    color: white;
    border: 3px solid #22543d;
    box-shadow: 0 8px 25px rgba(72, 187, 120, 0.4);
}

.checksum-error {
    background: linear-gradient(135deg, var(--color-error) 0%, #f56565 100%);
    color: white;
    border: 3px solid var(--color-error-dark);
    box-shadow: 0 8px 25px rgba(245, 101, 101, 0.4);
}

.checksum-warning {
    background: linear-gradient(135deg, #f6ad55 0%, #ed8936 100%);
    color: white;
    border: 3px solid #c05621;
    box-shadow: 0 8px 25px rgba(237, 137, 54, 0.4);
}

.checksum-warning {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    text-align: left;
}

.checksum-warning ul {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
}

.checksum-calculating {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-info-light);
    border: 2px solid var(--color-info);
    border-radius: var(--radius-md);
    color: var(--color-info-dark);
    font-weight: 600;
}

.checksum-calculating * {
    color: var(--color-info-dark);
}

.checksum-calculating .spinner {
    font-size: 1.5em;
    animation: spin 1s linear infinite;
}

.checksum-progress {
    width: 100%;
    max-width: 400px;
    margin-top: var(--spacing-sm);
}

.checksum-progress-bar {
    width: 100%;
    height: 24px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 2px solid rgba(0, 0, 0, 0.2);
    position: relative;
}

.checksum-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #2196F3, #1976D2);
    width: 0%;
    transition: width 0.2s ease-out;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 8px;
    color: white;
    font-weight: bold;
    font-size: var(--font-size-sm);
    min-width: 0;
}

.checksum-progress-text {
    text-align: center;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--color-info-dark);
}

.checksum-file-size {
    font-size: var(--font-size-sm);
    color: var(--color-info-dark);
    margin-top: var(--spacing-xs);
}

.checksum-hint {
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-sm);
}

.checksum-details {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.checksum-details summary {
    cursor: pointer;
    font-weight: 600;
    padding: var(--spacing-xs);
    user-select: none;
    color: rgba(255, 255, 255, 0.9);
}

.checksum-details summary:hover {
    color: white;
    text-decoration: underline;
}

.checksum-details summary::marker {
    color: rgba(255, 255, 255, 0.7);
}

.checksum-details[open] summary {
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.checksum-details ul {
    margin: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
}

.checksum-details code {
    background: rgba(0, 0, 0, 0.2);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.9em;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}