/* 
 * ConvertFast — Whiteboard Editorial Style
 * Typography: Times New Roman
 * Edges: 100% Sharp (border-radius: 0 !important)
 * Palette: Strict Flat White Background, Crisp Black Text, White Gradients & Animated Ambient Bubbles
 */

/* 1. Reset & Global Base */
*, *::before, *::after {
    box-sizing: border-box;
    border-radius: 0 !important;
}

body, h1, h2, h3, h4, p, ul, ol, li, figure, figcaption, blockquote, dl, dd {
    margin: 0;
    padding: 0;
}

ul, ol { list-style: none; }
a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
img, picture, video, canvas, svg { display: block; max-width: 100%; }

/* 2. Theme Variables — Strict Flat White / Black Whiteboard */
:root {
    --bg-color: #ffffff;
    --bg-gradient: linear-gradient(180deg, #ffffff 0%, #f4f5f8 100%);
    --card-color: #ffffff;
    --card-hover: #fafafa;
    --surface-color: #f1f2f5;
    --surface-hover: #e5e7eb;
    --text-color: #000000;
    --muted-color: #4b5563;
    --accent-color: #000000;
    --accent-gradient: linear-gradient(135deg, #000000 0%, #222222 100%);
    --accent-hover: #333333;
    --border-color: #000000;
    --border-subtle: #d1d5db;
    --success-color: #000000;
    --success-bg: #f3f4f6;

    /* Primary Typography: Times New Roman */
    --font-sans: 'Times New Roman', Times, Georgia, serif;
    --font-serif: 'Times New Roman', Times, Georgia, serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2.5rem;
    --space-2xl: 4rem;
}

/* Light / Dark Mode Toggle mappings — keeping strict high contrast */
[data-theme='dark'] {
    --bg-color: #0a0a0a;
    --bg-gradient: linear-gradient(180deg, #0a0a0a 0%, #141414 100%);
    --card-color: #121212;
    --card-hover: #1a1a1a;
    --surface-color: #1e1e1e;
    --surface-hover: #2a2a2a;
    --text-color: #ffffff;
    --muted-color: #9ca3af;
    --accent-color: #ffffff;
    --accent-gradient: linear-gradient(135deg, #ffffff 0%, #e5e5e5 100%);
    --accent-hover: #dddddd;
    --border-color: #ffffff;
    --border-subtle: #374151;
    --success-color: #ffffff;
    --success-bg: #1f2937;
}

body {
    background: var(--bg-gradient);
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-sans);
    font-size: 1.05rem;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow-x: hidden;
}

/* Ambient Floating Whiteboard Bubbles Background */
.bubbles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.bubble {
    position: absolute;
    bottom: -100px;
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.9), rgba(220, 225, 235, 0.4));
    border: 1px solid rgba(0, 0, 0, 0.12);
    box-shadow: inset -2px -2px 6px rgba(0, 0, 0, 0.05), 0 8px 20px rgba(0, 0, 0, 0.04);
    animation: floatUp 15s infinite linear;
}

[data-theme='dark'] .bubble {
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.15), rgba(60, 60, 70, 0.2));
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.bubble:nth-child(1) { left: 10%; width: 80px; height: 80px; animation-duration: 18s; animation-delay: 0s; }
.bubble:nth-child(2) { left: 25%; width: 40px; height: 40px; animation-duration: 14s; animation-delay: 3s; }
.bubble:nth-child(3) { left: 45%; width: 110px; height: 110px; animation-duration: 22s; animation-delay: 1s; }
.bubble:nth-child(4) { left: 65%; width: 55px; height: 55px; animation-duration: 16s; animation-delay: 5s; }
.bubble:nth-child(5) { left: 80%; width: 95px; height: 95px; animation-duration: 20s; animation-delay: 2s; }
.bubble:nth-child(6) { left: 92%; width: 35px; height: 35px; animation-duration: 13s; animation-delay: 4s; }

@keyframes floatUp {
    0% { transform: translateY(0) rotate(0deg); opacity: 0; }
    10% { opacity: 0.7; }
    90% { opacity: 0.7; }
    100% { transform: translateY(-110vh) rotate(360deg); opacity: 0; }
}

main { flex: 1; position: relative; z-index: 1; }

.container {
    width: 100%;
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* 3. Navigation */
.top-nav {
    background-color: var(--card-color);
    border-bottom: 2px solid var(--border-color);
    padding: var(--space-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: 700;
    font-size: 1.4rem;
    font-family: var(--font-serif);
    letter-spacing: -0.01em;
    color: var(--text-color);
    text-transform: uppercase;
}

.logo-accent {
    color: var(--text-color);
    text-decoration: underline;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 700;
    font-family: var(--font-serif);
    color: var(--text-color);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s ease;
}

.nav-links a:hover {
    border-color: var(--border-color);
}

.theme-btn {
    background-color: var(--card-color);
    border: 2px solid var(--border-color);
    color: var(--text-color);
    padding: 0.35rem 0.85rem;
    font-family: var(--font-serif);
    font-size: 0.9rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: all 0.2s ease;
}

.theme-btn:hover {
    background-color: var(--text-color);
    color: var(--card-color);
}

/* 4. Hero Section */
.hero-section {
    padding: var(--space-xl) 0 var(--space-md) 0;
    text-align: center;
}

.badge {
    display: inline-block;
    padding: 0.35rem 0.9rem;
    background-color: var(--card-color);
    border: 2px solid var(--border-color);
    color: var(--text-color);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    margin-bottom: var(--space-md);
    text-transform: uppercase;
}

.hero-title {
    font-size: clamp(2.2rem, 5vw, 3.8rem);
    font-weight: 700;
    font-family: var(--font-serif);
    line-height: 1.1;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    color: var(--muted-color);
    font-size: 1.15rem;
    font-family: var(--font-serif);
    max-width: 720px;
    margin: 0 auto var(--space-lg) auto;
}

/* 5. Live Interactive Workbench GUI — Whiteboard Style */
.studio-workbench {
    background-color: var(--card-color);
    border: 2px solid var(--border-color);
    box-shadow: 8px 8px 0px var(--border-color);
    margin: 0 auto var(--space-2xl) auto;
    overflow: hidden;
    transition: all 0.2s ease;
}

.studio-workbench.active {
    box-shadow: 12px 12px 0px var(--border-color);
}

.studio-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--surface-color);
    border-bottom: 2px solid var(--border-color);
    padding: var(--space-sm) var(--space-md);
}

.studio-title {
    font-size: 0.95rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-transform: uppercase;
}

.studio-title-dot {
    width: 10px;
    height: 10px;
    background-color: var(--text-color);
    display: inline-block;
}

.preset-pill-group {
    display: flex;
    gap: var(--space-xs);
    flex-wrap: wrap;
}

.preset-pill {
    font-size: 0.8rem;
    font-weight: 700;
    font-family: var(--font-serif);
    padding: 0.3rem 0.75rem;
    background-color: var(--card-color);
    border: 2px solid var(--border-color);
    color: var(--text-color);
    transition: all 0.2s ease;
}

.preset-pill:hover, .preset-pill.active {
    background-color: var(--text-color);
    color: var(--card-color);
}

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

/* Drop Zone Area */
.drop-zone {
    border: 2px dashed var(--border-color);
    background-color: var(--card-color);
    padding: var(--space-2xl) var(--space-lg);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 260px;
}

.drop-zone:hover, .drop-zone.dragover {
    background-color: var(--surface-color);
    border-style: solid;
}

.drop-icon {
    font-size: 3rem;
    margin-bottom: var(--space-sm);
    color: var(--text-color);
}

.drop-headline {
    font-size: 1.35rem;
    font-weight: 700;
    font-family: var(--font-serif);
    margin-bottom: var(--space-xs);
}

.drop-subhead {
    font-size: 0.95rem;
    color: var(--muted-color);
    font-family: var(--font-serif);
}

.file-input-hidden { display: none; }

/* Active File Card Preview */
.file-preview-card {
    display: none;
    background-color: var(--surface-color);
    border: 2px solid var(--border-color);
    padding: var(--space-md);
    margin-bottom: var(--space-lg);
    align-items: center;
    gap: var(--space-md);
}

.file-preview-card.show { display: flex; }

.preview-thumb {
    width: 64px;
    height: 64px;
    object-fit: cover;
    border: 2px solid var(--border-color);
    background-color: var(--card-color);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.preview-details { flex: 1; min-width: 0; }

.file-name {
    font-weight: 700;
    font-size: 1.1rem;
    font-family: var(--font-serif);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-meta {
    font-size: 0.85rem;
    color: var(--muted-color);
    font-family: var(--font-mono);
    display: flex;
    gap: 0.75rem;
    margin-top: 0.25rem;
}

.btn-remove-file {
    color: var(--text-color);
    font-size: 1.4rem;
    font-weight: 700;
    padding: 0.4rem;
    transition: opacity 0.2s ease;
}

.btn-remove-file:hover { opacity: 0.6; }

/* Controls Grid */
.workbench-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.control-section {
    background-color: var(--surface-color);
    border: 2px solid var(--border-color);
    padding: var(--space-md);
}

.control-title {
    font-size: 0.85rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text-color);
    letter-spacing: 0.05em;
    margin-bottom: var(--space-md);
    text-transform: uppercase;
}

.target-format-grid {
    display: flex;
    gap: var(--space-xs);
    flex-wrap: wrap;
}

.target-pill {
    padding: 0.5rem 0.9rem;
    background-color: var(--card-color);
    border: 2px solid var(--border-color);
    color: var(--text-color);
    font-weight: 700;
    font-family: var(--font-serif);
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.target-pill:hover, .target-pill.selected {
    background-color: var(--text-color);
    color: var(--card-color);
}

/* Settings Controls */
.settings-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.setting-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.setting-label {
    font-size: 0.95rem;
    font-weight: 700;
    font-family: var(--font-serif);
}

.setting-value {
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

input[type="range"] {
    flex: 1;
    accent-color: var(--text-color);
}

.input-num {
    width: 80px;
    padding: 0.35rem;
    background-color: var(--card-color);
    border: 2px solid var(--border-color);
    color: var(--text-color);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    text-align: center;
}

/* Execute Button */
.action-bar { margin-top: var(--space-lg); }

.btn-convert-execute {
    width: 100%;
    padding: var(--space-md);
    background-color: var(--text-color);
    color: var(--card-color);
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: 0.05em;
    border: 2px solid var(--border-color);
    text-transform: uppercase;
    box-shadow: 4px 4px 0px var(--border-color);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-convert-execute:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0px var(--border-color);
}

.btn-convert-execute:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Output Result Card */
.result-card {
    display: none;
    margin-top: var(--space-lg);
    background-color: var(--surface-color);
    border: 2px solid var(--border-color);
    padding: var(--space-lg);
}

.result-card.show { display: block; }

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--border-color);
}

.result-title {
    font-size: 1.1rem;
    font-weight: 700;
    font-family: var(--font-serif);
    color: var(--text-color);
}

.savings-badge {
    padding: 0.3rem 0.75rem;
    background-color: var(--text-color);
    color: var(--card-color);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
    border: 1px solid var(--border-color);
}

.result-preview-box {
    margin: var(--space-md) 0;
    background-color: var(--card-color);
    border: 2px solid var(--border-color);
    padding: var(--space-md);
    max-height: 260px;
    overflow: auto;
}

.result-preview-box img { max-height: 210px; margin: 0 auto; }

.result-preview-box pre {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    white-space: pre-wrap;
    word-break: break-all;
}

.result-actions {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.btn-download-primary {
    flex: 1;
    background-color: var(--text-color);
    color: var(--card-color);
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 1.05rem;
    padding: 0.75rem;
    text-align: center;
    border: 2px solid var(--border-color);
    box-shadow: 3px 3px 0px var(--border-color);
    transition: all 0.2s ease;
}

.btn-download-primary:hover {
    transform: translate(-1px, -1px);
    box-shadow: 4px 4px 0px var(--border-color);
}

.btn-copy-secondary {
    background-color: var(--card-color);
    border: 2px solid var(--border-color);
    color: var(--text-color);
    font-family: var(--font-serif);
    font-weight: 700;
    padding: 0.75rem 1.25rem;
    transition: all 0.2s ease;
}

.btn-copy-secondary:hover {
    background-color: var(--surface-color);
}

/* 6. Tool Grid Section */
.tools-section {
    padding-bottom: var(--space-2xl);
}

.section-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    font-family: var(--font-serif);
    letter-spacing: -0.01em;
}

.filter-tab-bar {
    display: flex;
    gap: var(--space-xs);
}

.filter-tab {
    padding: 0.4rem 0.85rem;
    background-color: var(--card-color);
    border: 2px solid var(--border-color);
    color: var(--text-color);
    font-size: 0.85rem;
    font-weight: 700;
    font-family: var(--font-serif);
    transition: all 0.2s ease;
}

.filter-tab:hover, .filter-tab.active {
    background-color: var(--text-color);
    color: var(--card-color);
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.tool-card {
    background-color: var(--card-color);
    border: 2px solid var(--border-color);
    padding: var(--space-lg);
    box-shadow: 4px 4px 0px var(--border-color);
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
}

.tool-card:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0px var(--border-color);
}

.tool-card-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-sm);
}

.tool-icon { height: 36px; width: auto; object-fit: contain; }

.tool-category-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.15rem 0.45rem;
    background-color: var(--surface-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.tool-title {
    font-size: 1.25rem;
    font-weight: 700;
    font-family: var(--font-serif);
    margin-bottom: 0.35rem;
}

.tool-desc {
    color: var(--muted-color);
    font-size: 0.95rem;
    font-family: var(--font-serif);
    margin-bottom: var(--space-md);
    flex: 1;
}

.tool-card-link {
    font-size: 0.9rem;
    font-weight: 700;
    font-family: var(--font-serif);
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 0.3rem;
    text-decoration: underline;
}

/* 7. Features Section */
.features-section {
    padding: var(--space-2xl) 0;
    border-top: 2px solid var(--border-color);
}

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

.feature-card {
    background-color: var(--card-color);
    border: 2px solid var(--border-color);
    padding: var(--space-lg);
    box-shadow: 4px 4px 0px var(--border-color);
}

.feature-icon { font-size: 2rem; margin-bottom: var(--space-sm); }
.feature-title { font-size: 1.2rem; font-weight: 700; font-family: var(--font-serif); margin-bottom: 0.35rem; }
.feature-desc { color: var(--muted-color); font-size: 0.95rem; font-family: var(--font-serif); }

/* 8. Ad Slots */
.ad-container {
    display: flex;
    justify-content: center;
    margin: var(--space-xl) auto;
}

.ad-placeholder {
    background-color: var(--surface-color);
    border: 2px solid var(--border-color);
    color: var(--muted-color);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner-ad { width: 728px; height: 90px; max-width: 100%; }
.square-ad { width: 336px; height: 280px; max-width: 100%; }
.sidebar-ad { width: 300px; height: 250px; max-width: 100%; }

/* 9. Footer */
.site-footer {
    background-color: var(--card-color);
    border-top: 2px solid var(--border-color);
    padding: var(--space-xl) 0;
    margin-top: var(--space-2xl);
}

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

.footer-logo {
    font-weight: 700;
    font-size: 1.2rem;
    font-family: var(--font-serif);
    text-transform: uppercase;
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
    font-size: 0.95rem;
    font-family: var(--font-serif);
}

.footer-links a:hover { text-decoration: underline; }
.footer-credit { font-size: 0.85rem; font-family: var(--font-serif); }

/* Progress Bar */
.progress-bar-container {
    width: 100%;
    height: 8px;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    margin: var(--space-lg) 0;
}

.progress-bar {
    height: 100%;
    background-color: var(--text-color);
    width: 0%;
    transition: width 0.3s ease;
}

/* 10. Sponsor Ad Conversion Loading Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.25s ease;
}

.modal-overlay.show {
    display: flex;
}

.sponsor-modal {
    background-color: var(--card-color);
    border: 2px solid var(--border-color);
    box-shadow: 8px 8px 0px var(--border-color);
    width: 90%;
    max-width: 480px;
    padding: var(--space-xl);
    position: relative;
    text-align: center;
}

.modal-close-btn {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-md);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--muted-color);
    transition: color 0.2s ease;
}

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

.modal-header {
    margin-bottom: var(--space-lg);
}

.modal-title {
    font-size: 1.4rem;
    font-weight: 700;
    font-family: var(--font-serif);
    margin-bottom: var(--space-sm);
}

.modal-subtitle {
    font-size: 0.95rem;
    font-family: var(--font-serif);
    color: var(--muted-color);
    line-height: 1.5;
}

.modal-ad-container {
    margin: var(--space-lg) auto;
    display: flex;
    justify-content: center;
}

.modal-ad {
    width: 300px;
    height: 250px;
    max-width: 100%;
    flex-direction: column;
}

.modal-progress-wrapper {
    width: 100%;
    height: 10px;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    margin: var(--space-md) 0 var(--space-sm) 0;
    overflow: hidden;
}

.modal-progress-bar {
    height: 100%;
    width: 0%;
    background-color: var(--text-color);
    transition: width 0.4s ease;
}

.modal-status-text {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--muted-color);
    margin-bottom: var(--space-md);
}

.modal-actions {
    margin-top: var(--space-md);
}

.modal-actions .btn-download-primary {
    width: 100%;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Responsive */
@media (max-width: 900px) {
    .tool-grid, .features-grid, .workbench-controls { grid-template-columns: 1fr; }
    .hero-title { font-size: 2.5rem; }
}

@media (max-width: 600px) {
    .nav-content { flex-direction: column; gap: var(--space-sm); }
    .result-actions { flex-direction: column; }
}