:root {
    --bg-color: #0d1117;
    --panel-bg: rgba(22, 27, 34, 0.7);
    --border-color: #30363d;
    --accent-color: #2f81f7;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --danger-color: #f85149;
    --warning-color: #d29922;
    --success-color: #3fb950;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Legacy adaptions */
    --icon-folder: #eac54f;
    --icon-file: #8b949e;
}

[data-theme="light"] {
    --bg-color: #ffffff;
    --panel-bg: rgba(246, 248, 250, 0.8);
    --border-color: #d0d7de;
    --accent-color: #0969da;
    --text-primary: #24292f;
    --text-secondary: #57606a;
    --danger-color: #cf222e;
    --warning-color: #9a6700;
    --success-color: #1a7f37;

    --icon-folder: #FFC107;
    --icon-file: #6e7681;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    min-height: 100vh;
    overflow-y: auto;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.file-control {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Upload Button Style */
label.upload-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--accent-color);
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

label.upload-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
    filter: brightness(1.1);
}

/* Theme Toggle */
button.theme-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem;
    border-radius: 6px;
    cursor: pointer;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: all 0.2s ease;
}

button.theme-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Main Content */
.dashboard {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Empty State / Upload Card */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem;
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    background: var(--bg-color);
    margin-top: 2rem;
    transition: all 0.3s;
}

.empty-state.drag-over {
    border-color: var(--accent-color);
    background: rgba(47, 129, 247, 0.05);
}

.empty-content {
    text-align: center;
    color: var(--text-secondary);
}

.empty-content h2 {
    margin: 1rem 0 0.5rem;
    color: var(--text-primary);
}

/* File Browser List */
.file-browser {
    width: 100%;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    margin-top: 1rem;
    display: none;
    /* Auto-shown via JS */
}

.browser-header {
    background: rgba(0, 0, 0, 0.05);
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.breadcrumbs {
    font-weight: 600;
    color: var(--text-primary);
}

.file-list {
    max-height: 70vh;
    overflow-y: auto;
}

.file-item {
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background 0.1s;
}

.file-item:last-child {
    border-bottom: none;
}

.file-item:hover {
    background: rgba(255, 255, 255, 0.05);
    /* Generic hover */
}

[data-theme="light"] .file-item:hover {
    background: #f1f1f1;
}

/* Icons */
.file-name {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
    color: var(--text-primary);
    flex-grow: 1;
    min-width: 0;
}

.f-icon {
    font-size: 20px;
    width: 24px;
    text-align: center;
}

/* Buttons inside file list */
.view-btn {
    padding: 4px 12px;
    font-size: 12px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    margin-left: 10px;
}

.view-btn:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* Status Text */
.status-text {
    margin-top: 20px;
    min-height: 20px;
    text-align: center;
    width: 100%;
}

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

.status-text.success {
    color: var(--success-color);
}

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

/* Utility */
.icon-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 5px;
    color: var(--text-secondary);
}

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