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

:root {
    --bg-primary: #1a1625;
    --bg-secondary: #221d2e;
    --glass-bg: rgba(34, 29, 46, 0.75);
    --glass-border: rgba(248, 165, 194, 0.1);
    --glass-hover: rgba(45, 38, 61, 0.8);
    --text-primary: #f8f9fa;
    --text-secondary: #c3aed6;
    --text-muted: #6e6582;
    --accent: #f8a5c2;
    --accent-light: #ffc1d6;
    --accent-glow: rgba(248, 165, 194, 0.2);
    --lavender: #c3aed6;
    --success: #10b981;
    --error: #f43f5e;
    --warning: #f59e0b;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    background-image:
        radial-gradient(circle at 2px 2px, rgba(236, 72, 153, 0.03) 1px, transparent 0);
    background-size: 40px 40px;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Paw Print Decoration */
.paw-print {
    position: fixed;
    width: 32px;
    height: 32px;
    color: var(--accent);
    opacity: 0.05;
    pointer-events: none;
    z-index: 1000;
}

/* ===== Background Animation ===== */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent) 0%, transparent 60%);
    top: -15%;
    right: -10%;
    animation-delay: 0s;
    opacity: 0.2;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--lavender) 0%, transparent 60%);
    bottom: -15%;
    left: -10%;
    animation-delay: -7s;
    opacity: 0.15;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #7d5fff 0%, transparent 60%);
    top: 30%;
    left: 40%;
    animation-delay: -14s;
    opacity: 0.1;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) rotate(0deg);
    }

    33% {
        transform: translate(30px, -20px) rotate(1deg);
    }

    66% {
        transform: translate(-15px, 20px) rotate(-1deg);
    }
}

/* ===== Layout ===== */
.container {
    max-width: 880px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

/* ===== Glass Card ===== */
.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.02);
    position: relative;
    overflow: visible;
}

.glass-card::before,
.glass-card::after {
    content: '';
    position: absolute;
    top: -12px;
    width: 24px;
    height: 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-bottom: none;
    z-index: -1;
    opacity: 0.3;
    /* visible in dark mode */
    transition: var(--transition);
}

.glass-card::before {
    left: 24px;
    border-radius: 12px 12px 0 0;
}

.glass-card::after {
    right: 24px;
    border-radius: 12px 12px 0 0;
}

.glass-card:hover {
    background: var(--glass-hover);
    border-color: rgba(236, 72, 153, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.glass-card:hover::before,
.glass-card:hover::after {
    opacity: 1;
    transform: translateY(-2px);
    background: var(--bg-secondary);
    box-shadow: 0 -4px 12px var(--accent-glow);
}

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 16px 0;
    background: rgba(15, 17, 21, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-icon {
    width: 36px;
    height: 36px;
    color: var(--accent-light);
}

.logo-text {
    font-size: 18px;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--text-primary);
}

/* ===== Hero ===== */
.hero {
    padding: 80px 0 60px;
}

.hero-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    text-align: center;
    margin-bottom: 16px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-light) 0%, var(--lavender) 50%, #7d5fff 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 17px;
    max-width: 540px;
    margin: 0 auto 48px;
    line-height: 1.6;
}

/* ===== Upload Card ===== */
.upload-card {
    padding: 8px;
    margin-bottom: 24px;
}

.upload-zone {
    border: 2px dashed rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: 56px 32px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--accent);
    background: rgba(99, 102, 241, 0.05);
}

.upload-zone.drag-over {
    transform: scale(1.01);
}

.upload-icon {
    color: var(--accent-light);
    margin-bottom: 16px;
    transition: var(--transition);
}

.upload-zone:hover .upload-icon {
    transform: translateY(-4px);
}

.upload-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 6px;
}

.upload-hint {
    color: var(--text-secondary);
    font-size: 14px;
}

/* File Info */
.file-info {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    animation: slideIn 0.3s ease;
}

.file-icon {
    color: var(--accent-light);
    flex-shrink: 0;
}

.file-details {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
}

.file-name {
    font-weight: 600;
    font-size: 15px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-size {
    color: var(--text-secondary);
    font-size: 13px;
}

.btn-remove {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.btn-remove:hover {
    color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

/* ===== Options Panel ===== */
.options-panel {
    padding: 32px;
    margin-bottom: 24px;
}

.section-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 24px;
    letter-spacing: -0.01em;
}

.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 32px;
}

.option-group.full-width {
    grid-column: 1 / -1;
}

.option-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Theme Selector */
.theme-selector {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.theme-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 14px 8px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-sans);
}

.theme-btn:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.15);
    color: var(--text-primary);
}

.theme-btn.active {
    background: rgba(236, 72, 153, 0.12);
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow);
}

.theme-icon {
    font-size: 20px;
    font-weight: 700;
    font-family: serif;
}

.theme-name {
    font-size: 11px;
    font-weight: 500;
}

/* Toggle Group */
.toggle-group {
    display: flex;
    gap: 6px;
    background: rgba(140, 120, 100, 0.08);
    padding: 4px;
    border-radius: 10px;
}

.toggle-btn {
    flex: 1;
    padding: 10px 12px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    font-family: var(--font-sans);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.toggle-btn:hover {
    color: var(--text-primary);
}

.toggle-btn.active {
    background: var(--accent);
    color: white;
    box-shadow: 0 2px 12px var(--accent-glow);
}

/* Text Input */
.text-input {
    width: 100%;
    padding: 12px 16px;
    background: rgba(140, 120, 100, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 14px;
    transition: var(--transition);
    outline: none;
}

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

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

/* Convert Button */
.btn-convert {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 18px 32px;
    background: linear-gradient(135deg, var(--accent), #db2777);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 16px;
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-convert::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: translateX(-100%);
    transition: 0.5s;
}

.btn-convert:hover:not(:disabled)::before {
    transform: translateX(100%);
}

.btn-convert:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--accent-glow);
}

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

.btn-convert:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-arrow {
    transition: var(--transition);
}

.btn-convert:hover:not(:disabled) .btn-arrow {
    transform: translateX(4px);
}

/* ===== Progress Card ===== */
.progress-card {
    padding: 32px;
    margin-bottom: 24px;
    animation: slideIn 0.4s ease;
}

.progress-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 20px;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--glass-border);
    border-top-color: var(--accent-light);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.progress-label {
    font-size: 16px;
    font-weight: 600;
}

.progress-bar-track {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 100px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 100px;
    transition: width 0.5s ease;
    position: relative;
}

.progress-bar-fill::after {
    content: '';
    position: absolute;
    right: 0;
    top: 0;
    width: 40px;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3));
    animation: shimmer 1.5s ease-in-out infinite;
}

@keyframes shimmer {

    0%,
    100% {
        opacity: 0;
    }

    50% {
        opacity: 1;
    }
}

.progress-message {
    color: var(--text-secondary);
    font-size: 14px;
}

/* ===== Results Section ===== */
.results-section {
    animation: slideIn 0.5s ease;
    margin-bottom: 80px;
}

.results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.results-actions {
    display: flex;
    gap: 10px;
}

.btn-action {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: var(--transition);
}

.btn-action:hover {
    background: var(--glass-hover);
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.15);
}

.btn-action.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.btn-action.btn-primary:hover {
    background: var(--accent-light);
    box-shadow: 0 4px 20px var(--accent-glow);
}

/* Stats */
.stats-row {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.stat-chip {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 100px;
    font-size: 13px;
}

.stat-value {
    font-weight: 700;
    color: var(--accent-light);
}

.stat-label {
    color: var(--text-secondary);
}

/* Preview */
.preview-card {
    overflow: hidden;
}

.preview-header {
    padding: 14px 24px;
    border-bottom: 1px solid var(--glass-border);
}

.preview-tab {
    font-size: 13px;
    font-weight: 600;
    color: var(--accent-light);
    padding-bottom: 2px;
    border-bottom: 2px solid var(--accent);
}

.preview-code {
    padding: 24px;
    margin: 0;
    max-height: 500px;
    overflow: auto;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.7;
    color: var(--text-secondary);
    tab-size: 2;
}

.preview-code::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.preview-code::-webkit-scrollbar-track {
    background: transparent;
}

.preview-code::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

.preview-code::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 12px 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    z-index: 1000;
    transition: transform 0.3s ease;
    backdrop-filter: blur(20px);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast.toast-success {
    border-color: var(--success);
}

.toast.toast-error {
    border-color: var(--error);
}

/* More Cats! */
.cat-decoration {
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 60px;
    height: 60px;
    opacity: 0.1;
    transform: rotate(15deg);
}

/* ===== Theme Selector Layout ===== */
.theme-container {
    display: flex;
    flex-direction: column;
    gap: 0px;
}

.theme-preview-trigger {
    background: none;
    border: none;
    color: var(--accent);
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: underline;
    padding: 6px 0;
    opacity: 0.6;
    transition: var(--transition);
}

.theme-preview-trigger:hover {
    opacity: 1;
}

/* ===== Modal ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
}

.modal-overlay.show {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    width: 100%;
    max-width: 680px;
    max-height: 90vh;
    padding: 40px;
    position: relative;
    overflow-y: auto;
}

.modal-close {
    position: absolute;
    top: 24px;
    right: 24px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--error);
    transform: rotate(90deg);
}

.modal-header {
    margin-bottom: 32px;
}

.modal-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}

.modal-subtitle {
    color: var(--text-secondary);
    font-size: 15px;
}

/* ===== LaTeX Rendition (The "Snippet") ===== */
.latex-paper {
    background: #fff;
    color: #000;
    padding: 60px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    border-radius: 4px;
    min-height: 500px;
    font-family: serif;
    line-height: 1.5;
}

.latex-paper h1 {
    font-size: 1.8em;
    margin-bottom: 0.8em;
}

.latex-paper h2 {
    font-size: 1.3em;
    margin-top: 1.5em;
    margin-bottom: 0.6em;
}

.latex-paper p {
    margin-bottom: 1em;
    text-align: justify;
}

/* Themes Mockups */
.theme-modern .latex-paper {
    font-family: 'Inter', sans-serif;
}

.theme-modern .latex-header-title {
    color: #2962ff;
    font-weight: 800;
    border-bottom: 1.5pt solid #2962ff;
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.theme-modern .latex-section {
    color: #2962ff;
    border-bottom: 0.5pt solid #e0e0e0;
    padding-bottom: 4px;
    margin-top: 20px;
}

.theme-ieee .latex-paper {
    font-family: 'Times New Roman', serif;
    padding: 40px;
    font-size: 14px;
}

.theme-ieee .latex-header-title {
    text-align: center;
    text-transform: uppercase;
    font-size: 1.4em;
    margin-bottom: 20px;
}

.theme-ieee .latex-header-author {
    text-align: center;
    margin-bottom: 30px;
}

.theme-ieee .latex-section {
    text-align: center;
    text-transform: uppercase;
    font-weight: bold;
    margin-top: 20px;
}

.theme-nature .latex-paper {
    font-family: 'Times New Roman', serif;
    padding: 40px;
    line-height: 1.25;
}

.theme-nature .latex-header-title {
    font-weight: 900;
    font-size: 1.6em;
}

.theme-nature .latex-section {
    font-weight: bold;
    border-top: 2px solid #000;
    padding-top: 8px;
    margin-top: 30px;
}

.theme-academic .latex-paper {
    font-family: 'Palatino', serif;
    line-height: 1.8;
    padding: 70px;
}

.theme-academic .latex-header-title {
    text-align: center;
    font-style: italic;
    font-weight: 500;
    font-size: 2em;
}

.theme-academic .latex-section {
    font-variant: small-caps;
    letter-spacing: 0.1em;
    text-align: center;
    margin-top: 40px;
}

/* ===== Animations ===== */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(16px);
    }

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .hero {
        padding: 48px 0 40px;
    }

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

    .theme-selector {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .results-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .stats-row {
        flex-wrap: wrap;
    }

    .nav-links {
        display: none;
    }

    .modal-content {
        padding: 24px;
    }

    .latex-paper {
        padding: 30px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .options-panel {
        padding: 24px 16px;
    }

    .upload-zone {
        padding: 40px 20px;
    }
}