:root {
    /* Dark Theme (Default) */
    --bg-color: #0d1117;
    --card-bg: #161b22;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --accent-color: #58a6ff;
    --accent-hover: #1f6feb;
    --border-color: #30363d;
    --error-color: #f85149;
    --success-color: #3fb950;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
    --header-height: 64px;
    --footer-height: 60px;
}

[data-theme="light"] {
    --bg-color: #ffffff;
    --card-bg: #f6f8fa;
    --text-primary: #1f2328;
    --text-secondary: #656d76;
    --accent-color: #0969da;
    --accent-hover: #0550ae;
    --border-color: #d0d7de;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow: hidden;
    /* Prevent body scroll, use main scroll */
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

header {
    background: rgba(var(--header-bg-rgb, 22, 27, 34), 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 0 2rem;
    height: var(--header-height);
    display: flex;
    align-items: center;
    flex-shrink: 0;
    z-index: 100;
}

[data-theme="light"] header {
    background: rgba(255, 255, 255, 0.8);
}

.header-content {
    max-width: 1012px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

h1.app-title {
    font-size: 1.1rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    max-width: 60%;
}

.app-title a {
    text-decoration: none;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.25rem;
    transition: opacity 0.2s;
}

.app-title a:hover {
    opacity: 0.8;
}

.app-title a span {
    background: linear-gradient(135deg, var(--accent-color), #ec4899);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
}

#file-name-display {
    border-left: 1px solid var(--border-color);
    padding-left: 0.75rem;
    margin-left: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    /* Match parent h1 style and reset gradient */
    color: var(--text-primary);
    -webkit-text-fill-color: var(--text-primary);
    font-weight: 600;
}

.actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

button,
a.btn {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.hidden-action {
    display: none !important;
}

button:hover,
a.btn:hover {
    background-color: var(--border-color);
    border-color: var(--text-secondary);
}

#theme-toggle {
    font-size: 1.1rem;
    padding: 0.4rem;
    width: 34px;
    height: 34px;
}

#go-btn {
    background-color: var(--accent-color);
    color: #ffffff;
    border: none;
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
}

#go-btn:hover {
    background-color: var(--accent-hover);
}

main {
    flex: 1;
    overflow-y: auto;
    width: 100%;
    scroll-behavior: smooth;
    padding: 2rem 0;
}

.content-container {
    max-width: 1012px;
    margin: 0 auto;
    padding: 0 2rem;
}

.markdown-body {
    background-color: transparent;
    color: var(--text-primary);
}

/* Custom Markdown Styles */
.markdown-body h1,
.markdown-body h2 {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3em;
    margin-top: 24px;
    margin-bottom: 16px;
    font-weight: 600;
    line-height: 1.25;
}

.markdown-body h1 {
    font-size: 1.75em;
}

.markdown-body h2 {
    font-size: 1.5em;
}

.markdown-body h3 {
    font-size: 1.25em;
    margin-top: 24px;
    margin-bottom: 16px;
    font-weight: 600;
}

.markdown-body p,
.markdown-body blockquote,
.markdown-body ul,
.markdown-body ol,
.markdown-body dl,
.markdown-body table,
.markdown-body pre {
    margin-top: 0;
    margin-bottom: 16px;
}

.markdown-body code {
    padding: 0.2em 0.4em;
    margin: 0;
    font-size: 85%;
    background-color: rgba(110, 118, 129, 0.2);
    border-radius: 6px;
    font-family: var(--font-mono);
}

.markdown-body pre {
    padding: 16px;
    overflow: auto;
    font-size: 85%;
    line-height: 1.45;
    background-color: var(--card-bg);
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.markdown-body pre code {
    padding: 0;
    margin: 0;
    font-size: 100%;
    word-break: normal;
    white-space: pre;
    background-color: transparent;
    border: 0;
}

.markdown-body a {
    color: var(--accent-color);
    text-decoration: none;
}

.markdown-body a:hover {
    text-decoration: underline;
}

.markdown-body blockquote {
    padding: 0 1em;
    color: var(--text-secondary);
    border-left: 0.25em solid var(--border-color);
}

.markdown-body table {
    border-spacing: 0;
    border-collapse: collapse;
    display: block;
    width: max-content;
    max-width: 100%;
    overflow: auto;
}

.markdown-body table th,
.markdown-body table td {
    padding: 6px 13px;
    border: 1px solid var(--border-color);
}

.markdown-body table tr {
    background-color: var(--bg-color);
    border-top: 1px solid var(--border-color);
}

.markdown-body table tr:nth-child(2n) {
    background-color: var(--card-bg);
}

.markdown-body img {
    max-width: 100%;
    box-sizing: content-box;
    background-color: transparent;
}

/* Landing Page & States */
.hidden {
    display: none !important;
}

#loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(88, 166, 255, 0.1);
    border-radius: 50%;
    border-top-color: var(--accent-color);
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 1rem;
}

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

.landing-content,
.error-content {
    text-align: center;
    background: var(--card-bg);
    padding: 3rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    max-width: 600px;
    margin: 2rem auto;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .landing-content,
[data-theme="dark"] .error-content {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.landing-content h2 {
    margin-bottom: 1rem;
    font-size: 1.75rem;
}

.landing-content p {
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

.divider {
    margin: 1.5rem 0;
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 600;
}

.divider::before,
.divider::after {
    content: "";
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.divider span {
    padding: 0 1rem;
}

.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    cursor: pointer;
    transition: all 0.2s ease;
    background: rgba(110, 118, 129, 0.05);
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--accent-color);
    background: rgba(88, 166, 255, 0.05);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    pointer-events: none;
}

.upload-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    opacity: 0.8;
}

.upload-zone p {
    margin-bottom: 0.25rem !important;
    font-size: 1rem;
    color: var(--text-primary);
}

.upload-subtext {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

input[type="text"] {
    flex: 1;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    font-family: var(--font-sans);
    outline: none;
    transition: all 0.2s;
}

input[type="text"]:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

.error-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 1rem;
}

.error-content h2 {
    color: var(--error-color);
    margin-bottom: 0.5rem;
}

.error-content p {
    margin-bottom: 2rem;
}

footer {
    height: var(--footer-height);
    display: flex;
    align-items: center;
    justify-content: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.8rem;
    background-color: var(--bg-color);
    flex-shrink: 0;
    z-index: 100;
}

footer p {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

footer a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
}

footer a:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

@media (max-width: 768px) {
    header {
        padding: 0 1rem;
    }

    .header-content {
        gap: 0.5rem;
    }

    h1 {
        font-size: 1rem;
    }

    .input-group {
        flex-direction: column;
    }

    .content-container {
        padding: 0 1rem;
    }

    .landing-content {
        padding: 2rem 1rem;
        margin: 1rem;
    }
}