@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Space+Grotesk:wght@300;400;500;600;700&family=Fira+Code:wght@400;500&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:wght,FILL@100..700,0..1&display=swap');

:root {
    --inverse-surface: #dae2fd;
    --surface-dim: #0b1326;
    --on-secondary-fixed-variant: #3f465c;
    --surface-container-high: #222a3d;
    --surface-container: #171f33;
    --tertiary-fixed-dim: #4edea3;
    --secondary-fixed: #dae2fd;
    --surface-tint: #c0c1ff;
    --secondary-container: #3f465c;
    --secondary: #bec6e0;
    --surface-container-low: #131b2e;
    --primary-fixed-dim: #c0c1ff;
    --primary: #c0c1ff;
    --surface-bright: #31394d;
    --on-primary: #1000a9;
    --surface-container-highest: #2d3449;
    --on-tertiary-fixed: #002113;
    --on-error: #690005;
    --inverse-primary: #494bd6;
    --inverse-on-surface: #283044;
    --outline-variant: #464554;
    --on-secondary: #283044;
    --on-surface: #dae2fd;
    --on-tertiary: #003824;
    --on-primary-fixed: #07006c;
    --primary-fixed: #e1e0ff;
    --on-surface-variant: #c7c4d7;
    --surface-variant: #2d3449;
    --on-primary-container: #0d0096;
    --tertiary-fixed: #6ffbbe;
    --on-tertiary-container: #000703;
    --on-secondary-container: #adb4ce;
    --surface-container-lowest: #060e20;
    --tertiary: #4edea3;
    --error: #ffb4ab;
    --on-secondary-fixed: #131b2e;
    --primary-container: #8083ff;
    --outline: #908fa0;
    --tertiary-container: #00885d;
    --background: #0b1326;
    --on-primary-fixed-variant: #2f2ebe;
    --error-container: #93000a;
    --surface: #0b1326;
    --on-error-container: #ffdad6;
    --secondary-fixed-dim: #bec6e0;
    --on-tertiary-fixed-variant: #005236;
    --on-background: #dae2fd;

    --font-headline: 'Inter', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-label: 'Space Grotesk', sans-serif;
    --font-mono: 'Fira Code', monospace;

    --radius-sm: 0.125rem;
    --radius-md: 0.25rem;
    --radius-lg: 0.5rem;
    --radius-full: 0.75rem;
}

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

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    background-color: var(--surface);
    color: var(--on-surface);
    font-family: var(--font-body);
    line-height: 1.5;
}

::selection {
    background-color: rgba(192, 193, 255, 0.3);
}

.material-symbols-outlined {
    font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--surface);
}

::-webkit-scrollbar-thumb {
    background: var(--surface-variant);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--outline-variant);
}

/* Buttons */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 700;
    border-radius: var(--radius-lg);
    background: linear-gradient(to bottom right, var(--primary), var(--primary-container));
    color: var(--on-primary);
    box-shadow: 0 10px 15px -3px rgba(192, 193, 255, 0.1);
    border: none;
    cursor: pointer;
    transition: opacity 0.2s;
    text-decoration: none;
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-ghost {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: rgba(218, 226, 253, 0.6);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: color 0.2s;
    text-decoration: none;
}

.btn-ghost:hover {
    color: var(--on-surface);
}

.btn-export {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.75rem;
    background-color: var(--surface-container-highest);
    color: var(--primary);
    border-radius: var(--radius-sm);
    font-family: var(--font-label);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s;
    text-decoration: none;
}

.btn-export:hover {
    background-color: var(--surface-bright);
}

/* Nav links (top bar) */
.top-nav-link {
    color: rgba(218, 226, 253, 0.6);
    text-decoration: none;
    font-family: var(--font-body);
    font-size: 0.875rem;
    letter-spacing: 0.05em;
    transition: color 0.2s;
}

.top-nav-link:hover {
    color: var(--on-surface);
}

/* Sidebar nav items */
.sidebar-nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    color: rgba(218, 226, 253, 0.5);
    text-decoration: none;
    transition: all 0.2s;
    border-left: 4px solid transparent;
}

.sidebar-nav-link:hover {
    background-color: rgba(23, 31, 51, 0.5);
    color: var(--on-surface);
}

.sidebar-nav-link.active {
    background-color: var(--surface-container);
    color: var(--primary);
    border-left-color: var(--tertiary);
    font-weight: 700;
}

.sidebar-nav-link .nav-label {
    font-family: var(--font-label);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Editor file tab bar */
.file-tab-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 2.5rem;
    padding: 0 1rem;
    background-color: var(--surface-container-lowest);
    border-bottom: 1px solid rgba(70, 69, 84, 0.1);
}

.file-tab-bar .file-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.file-tab-bar .file-name {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--on-surface-variant);
    text-transform: uppercase;
    letter-spacing: -0.05em;
}

.file-tab-bar .file-meta {
    display: flex;
    gap: 1rem;
}

.file-tab-bar .file-meta span {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--outline);
}

/* Editor content area */
.editor-content {
    flex: 1;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.75;
    overflow: hidden;
    background-color: rgba(6, 14, 32, 0.3);
}

.editor-content .editor-lines {
    display: flex;
    height: 100%;
}

.editor-content .line-numbers {
    width: 3rem;
    flex-shrink: 0;
    text-align: right;
    padding: 1.5rem 0.75rem 1.5rem 0;
    color: rgba(70, 69, 84, 0.6);
    user-select: none;
    -webkit-user-select: none;
    overflow: hidden;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.75;
}

.editor-content .code-area {
    flex: 1;
    padding: 1.5rem;
    padding-left: 0.75rem;
    background: transparent;
    border: none;
    outline: none;
    resize: none;
    color: var(--on-surface);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.75;
    white-space: pre;
    overflow-y: auto;
    overflow-x: auto;
    tab-size: 2;
    caret-color: var(--primary);
}

.editor-content .code-area::placeholder {
    color: rgba(218, 226, 253, 0.2);
}

/* Syntax highlighting tokens */
.token-h1 { color: var(--tertiary); }
.token-h2 { color: var(--primary); }
.token-hr { color: rgba(70, 69, 84, 0.6); }
.token-text { color: var(--on-surface-variant); }
.token-code { color: var(--tertiary-container); }

/* Stub page placeholder */
.stub-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    gap: 1rem;
    color: rgba(218, 226, 253, 0.4);
}

.stub-page .stub-icon {
    font-size: 3rem;
    color: rgba(192, 193, 255, 0.3);
}

.stub-page .stub-title {
    font-family: var(--font-label);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(218, 226, 253, 0.5);
}

.stub-page .stub-description {
    font-size: 0.8125rem;
    max-width: 24rem;
    text-align: center;
    line-height: 1.6;
}