:root {
    --bg-base: #fafafa;
    --bg-panel: #ffffff;
    --bg-panel-hover: #f1f5f9;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-dim: #e2e8f0;
    --border-focus: #3b82f6;

    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --danger: #ef4444;
    --danger-bg: #fef2f2;

    --grad-1: #3b82f6;
    --grad-2: #10b981;
}

body.dark-theme {
    --bg-base: #0f172a;
    --bg-panel: #1e293b;
    --bg-panel-hover: #334155;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-dim: rgba(255, 255, 255, 0.1);
    --border-focus: #60a5fa;
    --danger-bg: rgba(239, 68, 68, 0.1);
}

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--bg-base);
    color: var(--text-main);
    line-height: 1.5;
    transition: background-color 0.3s, color 0.3s;
}

svg {
    display: block;
}

.w-4 {
    width: 1rem;
}

.h-4 {
    height: 1rem;
}

.w-5 {
    width: 1.25rem;
}

.h-5 {
    height: 1.25rem;
}

.w-6 {
    width: 1.5rem;
}

.h-6 {
    height: 1.5rem;
}

.w-10 {
    width: 2.5rem;
}

.h-10 {
    height: 2.5rem;
}

.hidden {
    display: none !important;
}

.mt-4 {
    margin-top: 1rem;
}

.mx-auto {
    margin-left: auto;
    margin-right: auto;
}

.block {
    display: block;
}

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

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

.text-danger {
    color: var(--danger);
}

.text-gradient {
    background: linear-gradient(135deg, var(--grad-1), var(--grad-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Base Layout */
.app-wrapper {
    max-width: 1000px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.25rem;
}

.nav-actions {
    display: flex;
    gap: 0.5rem;
}

.main-content {
    flex: 1;
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.hero {
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.hero p {
    color: var(--text-muted);
    font-size: 1.125rem;
}

/* Buttons & Links */
button {
    font-family: inherit;
}

.btn-icon {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    padding: 0.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-icon:hover {
    color: var(--text-main);
    background: var(--bg-panel-hover);
}

.text-link {
    background: transparent;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-weight: 500;
    text-decoration: underline;
    font-size: inherit;
}

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

.btn-primary,
.btn-secondary,
.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border-radius: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    padding: 0.75rem 1.5rem;
    border: none;
}

.btn-sm {
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--grad-1), var(--grad-2));
    color: white;
}

.btn-primary:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(1px);
}

.btn-secondary {
    background: var(--bg-panel-hover);
    color: var(--text-main);
    border: 1px solid var(--border-dim);
}

.btn-secondary:hover {
    background: var(--border-dim);
}

.btn-outline {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--border-dim);
}

.btn-outline:hover {
    background: var(--bg-panel);
    border-color: var(--border-focus);
}

/* Drop Zone */
.upload-zone {
    border: 2px dashed var(--border-dim);
    border-radius: 1rem;
    background: var(--bg-panel);
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    position: relative;
    overflow: hidden;
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--accent);
    background: var(--bg-panel-hover);
}

.upload-zone.drag-over {
    transform: scale(1.02);
}

.upload-icon {
    color: var(--text-muted);
    background: var(--bg-base);
    padding: 1rem;
    border-radius: 50%;
    margin-bottom: 0.5rem;
    transition: color 0.3s, transform 0.3s;
}

.upload-zone:hover .upload-icon {
    color: var(--accent);
    transform: translateY(-5px);
}

.hidden-input {
    display: none;
}

/* Processing */
.processing-state {
    text-align: center;
    padding: 3rem;
    background: var(--bg-panel);
    border-radius: 1rem;
    border: 1px solid var(--border-dim);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    animation: fadeIn 0.3s ease;
}

.loader {
    width: 30px;
    height: 30px;
    border: 3px solid var(--border-dim);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.progress-bar {
    width: 100%;
    max-width: 300px;
    height: 6px;
    background: var(--border-dim);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent);
    transition: width 0.1s linear;
}

@keyframes spin {
    100% {
        transform: rotate(360deg);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Error */
.error-state {
    background: var(--danger-bg);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--danger);
    padding: 1rem;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    animation: fadeIn 0.3s ease;
}

.error-state button {
    margin-left: auto;
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: none;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    cursor: pointer;
}

.error-state button:hover {
    background: rgba(239, 68, 68, 0.2);
}

/* Results */
.result-section {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 1.5rem;
    animation: fadeIn 0.4s ease;
}

@media (max-width: 768px) {
    .result-section {
        grid-template-columns: 1fr;
    }
}

.preview-panel,
.code-panel {
    background: var(--bg-panel);
    border: 1px solid var(--border-dim);
    border-radius: 1rem;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

.panel-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-dim);
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.02);
}

.panel-actions {
    display: flex;
    gap: 0.5rem;
}

.preview-container {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-base);
    background-image: linear-gradient(45deg, var(--border-dim) 25%, transparent 25%),
        linear-gradient(-45deg, var(--border-dim) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--border-dim) 75%),
        linear-gradient(-45deg, transparent 75%, var(--border-dim) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    height: 250px;
}

.preview-container img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 0.25rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.meta-info {
    padding: 1rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    border-top: 1px solid var(--border-dim);
}

.meta-badge {
    background: var(--bg-base);
    border: 1px solid var(--border-dim);
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.code-area {
    flex: 1;
    width: 100%;
    padding: 1.5rem;
    border: none;
    background: transparent;
    color: var(--text-main);
    font-family: monospace;
    font-size: 0.875rem;
    resize: none;
    line-height: 1.4;
    word-break: break-all;
}

.code-area:focus {
    outline: none;
}

/* History Overlay */
.history-overlay {
    position: fixed;
    insert: 0;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 50;
    display: flex;
    justify-content: flex-end;
    backdrop-filter: blur(4px);
    transition: opacity 0.3s;
}

.history-overlay.hidden {
    opacity: 0;
    pointer-events: none;
    display: flex !important;
}

.history-sidebar {
    width: 350px;
    height: 100%;
    background: var(--bg-panel);
    border-left: 1px solid var(--border-dim);
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.history-overlay:not(.hidden) .history-sidebar {
    transform: translateX(0);
}

.history-header {
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-dim);
}

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.history-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    border: 1px solid var(--border-dim);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background 0.2s;
}

.history-item:hover {
    background: var(--bg-base);
}

.history-item img {
    width: 40px;
    height: 40px;
    object-fit: cover;
    border-radius: 0.25rem;
}

.history-item-meta {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    overflow: hidden;
}

.history-item-meta .name {
    font-size: 0.875rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-item-meta .size {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.history-footer {
    padding: 1rem;
    border-top: 1px solid var(--border-dim);
    text-align: center;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text-main);
    color: var(--bg-panel);
    padding: 0.75rem 1.5rem;
    border-radius: 999px;
    font-weight: 500;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 100;
    pointer-events: none;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}