/* ════════════════════════════════════════════════════════════════
   MindVault — global styles
   Dark-only theme. Tokens are the single source of truth; never
   hardcode colors in components. Scoped component CSS lives in
   each *.razor.css. Only app-wide primitives belong here.
   ════════════════════════════════════════════════════════════════ */

/* ── Design Tokens (dark only) ──────────────────────────────────── */

:root {
    /* Fonts */
    --font-sans:  'Inter', system-ui, sans-serif;
    --font-serif: 'Lora', Georgia, serif;
    --font-mono:  'JetBrains Mono', 'Fira Code', monospace;

    /* Type scale */
    --text-xs:   11px;
    --text-sm:   13px;
    --text-base: 15px;
    --text-md:   16px;
    --text-lg:   18px;
    --text-xl:   22px;
    --text-2xl:  28px;
    --text-3xl:  36px;

    --leading-tight:   1.3;
    --leading-normal:  1.5;
    --leading-relaxed: 1.7;
    --leading-prose:   1.75;

    /* Spacing (4px base) */
    --space-1: 4px;  --space-2: 8px;   --space-3: 12px;
    --space-4: 16px; --space-5: 24px;  --space-6: 32px;
    --space-7: 48px; --space-8: 64px;

    /* Radii */
    --radius-sm:   4px;
    --radius-md:   8px;
    --radius-lg:   12px;
    --radius-xl:   16px;
    --radius-pill: 999px;

    /* Colors — dark */
    --color-bg:            #141413;
    --color-surface:       #1E1E1C;
    --color-surface-alt:   #262624;
    --color-surface-hover: #2E2E2B;

    --color-text:        #E8E6E1;
    --color-text-muted:  #9A9892;
    --color-text-subtle: #6A6865;

    --color-border:        rgba(255, 255, 255, 0.09);
    --color-border-strong: rgba(255, 255, 255, 0.18);

    --color-accent:      #5DA0E8;
    --color-accent-bg:   #1A2E42;
    --color-accent-text: #8EC4F5;

    --color-success:    #5BAD82;
    --color-success-bg: #162B20;
    --color-warning:    #E8B44B;
    --color-warning-bg: #2B2010;
    --color-danger:     #E87676;
    --color-danger-bg:  #2B1515;

    /* Borders */
    --border-subtle:  0.5px solid var(--color-border);
    --border-default: 1px solid var(--color-border);
    --border-strong:  1px solid var(--color-border-strong);
    --border-accent:  2px solid var(--color-accent);

    /* Shadows — use sparingly */
    --shadow-sm:    0 1px 3px rgba(0, 0, 0, 0.30);
    --shadow-md:    0 4px 12px rgba(0, 0, 0, 0.40);
    --shadow-focus: 0 0 0 3px rgba(93, 160, 232, 0.30);

    /* Transitions */
    --transition-fast: 100ms ease;
    --transition-base: 150ms ease;
    --transition-slow: 250ms ease;

    /* Z-index scale */
    --z-base:     0;
    --z-sidebar:  10;
    --z-topnav:   20;
    --z-dropdown: 30;
    --z-modal:    40;
    --z-toast:    50;

    /* Layout dimensions */
    --topnav-height:     56px;
    --sidebar-width:     240px;
    --content-max-width: 780px;
    --prose-max-width:   680px;

    color-scheme: dark;
}

/* ── Base elements ──────────────────────────────────────────────── */

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-base);
}
a:hover { color: var(--color-accent-text); }

h1, h2, h3, h4 {
    color: var(--color-text);
    font-weight: 600;
    line-height: var(--leading-tight);
}

h1:focus { outline: none; }

::selection {
    background: var(--color-accent-bg);
    color: var(--color-accent-text);
}

/* Scrollbars */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--color-border-strong) transparent;
}
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-thumb {
    background: var(--color-border-strong);
    border-radius: var(--radius-pill);
    border: 2px solid var(--color-bg);
}
*::-webkit-scrollbar-track { background: transparent; }

/* ── Buttons ────────────────────────────────────────────────────── */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 7px 16px;
    font-size: var(--text-sm);
    font-weight: 400;
    font-family: var(--font-sans);
    line-height: 1;
    border-radius: var(--radius-md);
    border: var(--border-default);
    background: transparent;
    color: var(--color-text);
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
}
.btn:hover { background: var(--color-surface-hover); }
.btn:active { transform: scale(0.98); }
.btn:focus-visible { box-shadow: var(--shadow-focus); outline: none; }
.btn:disabled { opacity: 0.45; pointer-events: none; }

.btn-primary {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #0E1620;
    font-weight: 500;
}
.btn-primary:hover { filter: brightness(1.08); background: var(--color-accent); }

.btn-ghost { border-color: transparent; }
.btn-ghost:hover { background: var(--color-surface-hover); border-color: transparent; }

.btn-danger { border-color: var(--color-danger-bg); color: var(--color-danger); }
.btn-danger:hover { background: var(--color-danger-bg); }

.btn-sm { padding: 5px 12px; font-size: var(--text-xs); }
.btn-lg { padding: 10px 22px; font-size: var(--text-md); }

.btn .ti { font-size: 16px; }

/* Icon-only button */
.icon-btn {
    width: 32px; height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: none;
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    cursor: pointer;
    font-size: 16px;
    transition: background var(--transition-base), color var(--transition-base);
}
.icon-btn:hover { background: var(--color-surface-hover); color: var(--color-text); }
.icon-btn:focus-visible { box-shadow: var(--shadow-focus); outline: none; }

/* ── Inputs ─────────────────────────────────────────────────────── */

.input, .textarea {
    width: 100%;
    padding: 8px 12px;
    font-size: var(--text-base);
    font-family: var(--font-sans);
    background: var(--color-surface);
    border: var(--border-default);
    border-radius: var(--radius-md);
    color: var(--color-text);
    outline: none;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}
.input::placeholder, .textarea::placeholder { color: var(--color-text-subtle); }
.input:focus, .textarea:focus {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-focus);
}
.textarea {
    resize: vertical;
    min-height: 100px;
    line-height: var(--leading-relaxed);
}

/* date input: inherit dark color-scheme from :root so the browser calendar is dark */
input[type="date"].input { color-scheme: dark; }

.form-field {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}
.form-label {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-muted);
}

/* ── Tags / badges ──────────────────────────────────────────────── */

.tag, .badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 10px;
    font-size: var(--text-xs);
    font-weight: 500;
    border-radius: var(--radius-pill);
    background: var(--color-surface-alt);
    color: var(--color-text-muted);
}
.badge--accent  { background: var(--color-accent-bg);  color: var(--color-accent-text); }
.badge--success { background: var(--color-success-bg); color: var(--color-success); }
.badge--warning { background: var(--color-warning-bg); color: var(--color-warning); }
.badge--danger  { background: var(--color-danger-bg);  color: var(--color-danger); }

/* ── Sidebar primitives (shared across sidebar node components) ──── */

.sidebar__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-1) var(--space-3) var(--space-1) var(--space-4);
    margin-bottom: var(--space-1);
}
.sidebar__section-label {
    font-size: var(--text-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-subtle);
}
.sidebar__empty {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    color: var(--color-text-subtle);
}

/* Expandable lazy tree (library/folder nodes + article leaves) */
.tree-row { display: flex; align-items: center; }
.tree-row:hover { background: var(--color-surface-hover); }
.tree-row:has(> .tree-row__link.active) { background: var(--color-accent-bg); }

.tree-row__chevron {
    width: 20px;
    height: 26px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: none;
    color: var(--color-text-subtle);
    cursor: pointer;
    padding: 0;
}
.tree-row__chevron:hover { color: var(--color-text); }
.tree-row__chevron .ti { font-size: 14px; transition: transform var(--transition-base); }
.tree-row__chevron .ti.open { transform: rotate(90deg); }
.tree-row__spacer { width: 20px; flex-shrink: 0; }

.tree-row__link {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 5px var(--space-3) 5px 0;
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    text-decoration: none;
}
.tree-row__link:hover { color: var(--color-text); }
.tree-row__link.active { color: var(--color-accent-text); font-weight: 500; }
.tree-row__icon { font-size: 15px; flex-shrink: 0; opacity: 0.85; }
.tree-row__label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.tree-note {
    padding: 4px var(--space-3);
    font-size: var(--text-xs);
    color: var(--color-text-subtle);
}

.date-group-header {
    font-size: var(--text-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-subtle);
    padding: var(--space-3) var(--space-3) var(--space-1);
}

.tree-row__date {
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--color-text-subtle);
    flex-shrink: 0;
    font-variant-numeric: tabular-nums;
}

/* ── Spinner ────────────────────────────────────────────────────── */

@keyframes spin { to { transform: rotate(360deg); } }
.spin { animation: spin 0.8s linear infinite; display: inline-block; }

/* Full-screen overlay while the auth state is being resolved (App.razor <Authorizing>) */
.auth-loading {
    position: fixed;
    inset: 0;
    z-index: var(--z-toast);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    color: var(--color-text-muted);
    font-size: 30px;
}

/* Visually hidden, still read by screen readers */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ── Page layout primitives (shared across pages) ───────────────── */

.page {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: var(--space-7) var(--space-6);
}
.page__header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-5);
}
.page__title { font-size: var(--text-2xl); font-weight: 600; margin: 0; line-height: var(--leading-tight); }
.page__subtitle { font-size: var(--text-sm); color: var(--color-text-muted); margin: var(--space-1) 0 0; }
.page__actions { display: flex; gap: var(--space-2); flex-shrink: 0; }

/* Card grid */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--space-4);
}

/* Resource card (libraries / journals) */
.resource-card {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-5);
    background: var(--color-surface);
    border: var(--border-subtle);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: inherit;
    transition: box-shadow var(--transition-base), border-color var(--transition-base);
}
.resource-card:hover { box-shadow: var(--shadow-sm); border-color: var(--color-border-strong); color: inherit; }
.resource-card__icon { font-size: 22px; color: var(--color-accent); }
.resource-card__name { font-size: var(--text-md); font-weight: 500; color: var(--color-text); }
.resource-card__desc { font-size: var(--text-sm); color: var(--color-text-muted); margin: 0; }

/* List sections (folders / articles) */
.list-section { margin-bottom: var(--space-6); }
.list-section__label {
    font-size: var(--text-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-subtle);
    margin: 0 0 var(--space-3);
}
.list-stack { display: flex; flex-direction: column; gap: var(--space-2); }

/* Folder row */
.folder-row {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background: var(--color-surface);
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-text);
    transition: background var(--transition-base), border-color var(--transition-base);
}
.folder-row:hover { background: var(--color-surface-hover); border-color: var(--color-border-strong); color: var(--color-text); }
.folder-row__icon { color: var(--color-text-muted); font-size: 18px; }
.folder-row__name { font-weight: 500; }
.folder-row__count { margin-left: auto; font-size: var(--text-xs); color: var(--color-text-subtle); }

/* Article / entry viewer */
.article-viewer__title { font-size: var(--text-2xl); font-weight: 600; line-height: var(--leading-tight); margin: 0 0 var(--space-3); }
.article-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: var(--border-subtle);
}
.article-meta__date { font-size: var(--text-sm); color: var(--color-text-subtle); display: inline-flex; align-items: center; gap: var(--space-1); }
.article-meta__tags { display: flex; flex-wrap: wrap; gap: var(--space-1); }
.article-meta__actions { margin-left: auto; display: flex; gap: var(--space-2); }

/* Editor page (full-height) */
.editor-page {
    display: flex;
    flex-direction: column;
    height: calc(100vh - var(--topnav-height));
}
.editor-page__head { padding: var(--space-4) var(--space-6) var(--space-3); }
.editor-page__title-input {
    width: 100%;
    font-size: var(--text-xl);
    font-weight: 600;
    font-family: var(--font-sans);
    background: transparent;
    border: none;
    color: var(--color-text);
    outline: none;
    padding: var(--space-2) 0;
}
.editor-page__title-input::placeholder { color: var(--color-text-subtle); }
.editor-page__tags { display: flex; align-items: center; flex-wrap: wrap; gap: var(--space-1); margin-top: var(--space-2); }
.editor-page__body { flex: 1; min-height: 0; padding: 0 var(--space-6); }

/* Tag pill with remove button (editor) */
.tag-removable { display: inline-flex; align-items: center; gap: 4px; }
.tag-removable button {
    border: none; background: none; color: inherit; cursor: pointer;
    display: inline-flex; padding: 0; font-size: 13px; opacity: 0.7;
}
.tag-removable button:hover { opacity: 1; }
.tag-add-input {
    width: 110px;
    height: 24px;
    padding: 0 8px;
    font-size: var(--text-xs);
    background: var(--color-surface);
    border: var(--border-default);
    border-radius: var(--radius-pill);
    color: var(--color-text);
    outline: none;
}
.tag-add-input:focus { border-color: var(--color-accent); box-shadow: var(--shadow-focus); }

/* Sticky save bar */
.save-bar {
    position: sticky;
    bottom: 0;
    background: var(--color-surface);
    border-top: var(--border-subtle);
    padding: var(--space-3) var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.save-bar__status { font-size: var(--text-xs); color: var(--color-text-subtle); }
.save-bar__actions { display: flex; gap: var(--space-2); }

/* Inline alert */
.alert {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
}
.alert--danger { background: var(--color-danger-bg); color: var(--color-danger); }
.alert--info { background: var(--color-accent-bg); color: var(--color-accent-text); }

/* ── Markdown prose (article / journal body) ────────────────────── */

.prose {
    font-family: var(--font-serif);
    font-size: 17px;
    line-height: var(--leading-prose);
    color: var(--color-text);
    max-width: var(--prose-max-width);
}
.prose > :first-child { margin-top: 0; }
.prose h1 { font-size: 24px; font-weight: 600; margin: 2rem 0 0.75rem; line-height: var(--leading-tight); }
.prose h2 { font-size: 20px; font-weight: 600; margin: 1.75rem 0 0.5rem; line-height: var(--leading-tight); }
.prose h3 { font-size: 17px; font-weight: 600; margin: 1.5rem 0 0.5rem; }
.prose p { margin: 0 0 1rem; }
.prose ul, .prose ol { margin: 0 0 1rem; padding-left: 1.5rem; }
.prose li { margin-bottom: 0.35rem; }
.prose a { color: var(--color-accent); text-decoration: underline; text-underline-offset: 2px; }
.prose img { max-width: 100%; border-radius: var(--radius-md); }
.prose hr { border: none; border-top: var(--border-subtle); margin: 2rem 0; }
.prose table { border-collapse: collapse; width: 100%; margin: 0 0 1rem; font-family: var(--font-sans); font-size: var(--text-sm); }
.prose th, .prose td { border: var(--border-subtle); padding: var(--space-2) var(--space-3); text-align: left; }
.prose th { background: var(--color-surface-alt); font-weight: 500; }
.prose code {
    font-family: var(--font-mono);
    font-size: 13px;
    background: var(--color-surface-alt);
    border: var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 1px 5px;
}
.prose pre {
    background: var(--color-surface-alt);
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    overflow-x: auto;
    margin: 0 0 1rem;
}
.prose pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 13px;
}
.prose blockquote {
    border-left: 3px solid var(--color-accent);
    margin: 1.25rem 0;
    padding: 0.5rem 0 0.5rem var(--space-4);
    color: var(--color-text-muted);
}

/* ── Blazor framework chrome (dark) ─────────────────────────────── */

#blazor-error-ui {
    background: var(--color-danger-bg);
    color: var(--color-danger);
    bottom: 0;
    box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.4);
    box-sizing: border-box;
    display: none;
    left: 0;
    padding: 0.6rem 1.25rem 0.7rem 1.25rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
}
#blazor-error-ui .reload { color: var(--color-danger); text-decoration: underline; }
#blazor-error-ui .dismiss {
    cursor: pointer;
    position: absolute;
    right: 0.75rem;
    top: 0.5rem;
}

.blazor-error-boundary {
    background: var(--color-danger);
    padding: 1rem 1rem 1rem 1rem;
    color: #fff;
}
.blazor-error-boundary::after { content: "An error has occurred."; }

/* App boot splash — shown by index.html until Blazor renders its first
   component. Self-contained (inline SVG mark, no icon font) so it paints
   instantly on a cold load. The bar tracks Blazor's real boot progress. */
.app-splash {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-5);
    background: var(--color-bg);
}
.app-splash__mark {
    width: 56px;
    height: 56px;
    color: var(--color-accent);
    animation: app-splash-pulse 1.8s ease-in-out infinite;
}
.app-splash__mark svg { width: 100%; height: 100%; display: block; }
.app-splash__name {
    font-family: var(--font-sans);
    font-size: var(--text-xl);
    font-weight: 600;
    letter-spacing: 0.01em;
    color: var(--color-text);
}
.app-splash__bar {
    width: 200px;
    height: 3px;
    border-radius: var(--radius-pill);
    background: var(--color-surface-alt);
    overflow: hidden;
}
.app-splash__bar-fill {
    display: block;
    height: 100%;
    width: var(--blazor-load-percentage, 0%);
    min-width: 8%;
    border-radius: inherit;
    background: var(--color-accent);
    transition: width 0.15s ease-out;
}
@keyframes app-splash-pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%      { opacity: 0.55; transform: scale(0.94); }
}
@media (prefers-reduced-motion: reduce) {
    .app-splash__mark { animation: none; }
}

/* ---- Share dialog (rendered inside <Modal>, outside ArticlePage's scoped CSS boundary — must be global) ---- */
.share-dialog__intro {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin: 0 0 var(--space-4);
}

.share-dialog__label {
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-subtle);
    margin-bottom: var(--space-2);
}

.share-dialog__options {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.share-opt {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 6px 12px;
    border: var(--border-default);
    border-radius: var(--radius-pill);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    cursor: pointer;
    user-select: none;
    transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}

.share-opt:hover { background: var(--color-surface-hover); }

.share-opt input { margin: 0; accent-color: var(--color-accent); }

.share-opt--active {
    border-color: var(--color-accent);
    background: var(--color-accent-bg);
    color: var(--color-accent-text);
}

.share-dialog__error { margin-top: var(--space-4); }

.share-dialog__manage { margin-right: auto; }

.share-url {
    display: flex;
    gap: var(--space-2);
    align-items: stretch;
}

.share-url__input {
    flex: 1;
    min-width: 0;
    padding: 7px 12px;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--color-text);
    background: var(--color-surface-alt);
    border: var(--border-default);
    border-radius: var(--radius-md);
}

.share-url__input:focus { outline: none; border-color: var(--color-accent); box-shadow: var(--shadow-focus); }

.share-dialog__hint {
    margin: var(--space-3) 0 0;
    font-size: var(--text-xs);
    color: var(--color-text-subtle);
}