:root {
    --font-sans: "Inter", sans-serif;
    --text-color: rgb(25, 25, 24);
    --bg-color: #fafafa;
    --border-color: rgba(55, 53, 47, 0.12);
    --space-8: 8px;
    --space-12: 12px;
    --space-16: 16px;
    --space-20: 20px;
    --space-24: 24px;
    --space-32: 32px;

    /* App Specific */
    --text-main: rgb(25, 25, 24);
    --text-secondary: rgba(25, 25, 24, 0.6);
    --text-body: rgba(25, 25, 24, 0.9);
    --primary: #2383E2;
    --primary-hover: #1B6DC1;
    --primary-active: #155A9E;
    --selection: rgba(35, 131, 226, 0.28);
    --caret: rgb(55, 53, 47);
    --hover-surface: rgba(55, 53, 47, 0.08);
    --border: rgba(0, 0, 0, 0.1);
    --bg-card: white;
}

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

body {
    font-family: var(--font-sans);
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--space-32) var(--space-24);
}

/* ========== APP HEADER ========== */
.app-header {
    text-align: center;
    margin-bottom: var(--space-24);
    padding: var(--space-16) var(--space-24);
    margin: calc(-1 * var(--space-32)) calc(-1 * var(--space-24)) var(--space-24);
}

.app-header__title {
    font-size: 36px;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.025em;
    color: var(--text-color);
    margin: 0;
    padding-bottom: var(--space-16);
}

.app-header__title::after {
    content: "";
    display: block;
    width: 40%;
    height: 1px;
    background: var(--border-color);
    margin: var(--space-16) auto 0;
}

.card {
    background: var(--bg-card);
    border: 0.5px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    margin-bottom: 24px;
}

.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    border-bottom: 0.5px solid var(--border);
    padding-bottom: 8px;
}

.tab-btn {
    background: none;
    border: none;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s;
}

.tab-btn:hover {
    background: var(--hover-surface);
}

.tab-btn.active {
    color: var(--text-main);
    background: var(--hover-surface);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

textarea {
    width: 100%;
    min-height: 300px;
    padding: 16px;
    border: 0.5px solid var(--border);
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
    resize: vertical;
    outline: none;
}

textarea:focus {
    border-color: var(--primary);
}

.upload-box {
    border: 1px dashed rgba(55, 53, 47, 0.16);
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s;
}

.upload-box:hover {
    border-color: var(--primary);
}

.upload-box.dragover {
    border-color: var(--primary);
    background: var(--hover-surface);
}

.upload-info .icon {
    font-size: 40px;
    display: block;
    margin-bottom: 12px;
}

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

.actions {
    margin-top: 24px;
    display: flex;
    justify-content: flex-end;
}

.primary-btn {
    background: #000000;
    color: white;
    font-size: 16px;
    font-weight: 500;
    padding: 10px 20px;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: background 0.2s;
    font-family: "Inter";
}

.primary-btn:hover {
    background: #1a1a1a;
}

.primary-btn:active {
    background: #333333;
}

.primary-btn.full-width {
    width: 100%;
}

.secondary-btn {
    background: white;
    border: 0.5px solid var(--border);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-main);
    cursor: pointer;
    transition: background 0.2s;
}

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

.btn-text {
    background: none;
    border: none;
    color: var(--primary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
}

.btn-text:hover {
    text-decoration: underline;
}

.loading-section {
    text-align: center;
    padding: 60px 0;
}

.loader {
    width: 40px;
    height: 40px;
    border: 3px solid var(--hover-surface);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

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

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

h2 {
    font-size: 28px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.output-grid {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 24px;
}

.preview-card {
    padding: 0;
    overflow: hidden;
}

.preview-header {
    padding: 12px 20px;
    border-bottom: 0.5px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #fcfcfc;
}

.preview-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.copy-buttons {
    display: flex;
    gap: 8px;
}

.markdown-body {
    padding: 32px;
    max-height: 600px;
    overflow-y: auto;
    font-size: 16px;
}

.hint {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 12px;
}

@media (max-width: 768px) {
    .container {
        padding: var(--space-24) var(--space-16);
    }

    .app-header {
        padding: var(--space-12) var(--space-16);
        margin: calc(-1 * var(--space-24)) calc(-1 * var(--space-16)) var(--space-20);
    }

    .app-header__title {
        font-size: 28px;
    }

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

    .sidebar {
        order: -1;
    }
}

/* Markdown styling inside preview */
.markdown-body h1 {
    font-size: 32px;
    margin-bottom: 16px;
    border-bottom: 0.5px solid var(--border);
    padding-bottom: 8px;
}

.markdown-body h2 {
    font-size: 24px;
    margin-top: 24px;
    margin-bottom: 12px;
}

.markdown-body h3 {
    font-size: 20px;
    margin-top: 20px;
    margin-bottom: 8px;
}

.markdown-body p {
    margin-bottom: 16px;
    color: var(--text-body);
}

.markdown-body ul,
.markdown-body ol {
    margin-bottom: 16px;
    padding-left: 20px;
}

.markdown-body li {
    margin-bottom: 4px;
}

.markdown-body code {
    background: var(--hover-surface);
    padding: 2px 4px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 14px;
}

.markdown-body pre {
    background: #f6f8fa;
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 16px;
}

.markdown-body pre code {
    background: none;
    padding: 0;
}

.markdown-body blockquote {
    border-left: 4px solid var(--border);
    padding-left: 16px;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 16px;
}