/**
 * SecureCollab Forum — Main CSS
 * Design tokens, layout, and all component styles (light mode).
 */

/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root {
    /* Color palette */
    --scf-brand:         #2563eb;
    --scf-brand-dark:    #1d4ed8;
    --scf-brand-light:   #dbeafe;
    --scf-accent:        #7c3aed;
    --scf-success:       #16a34a;
    --scf-warning:       #d97706;
    --scf-danger:        #dc2626;
    --scf-info:          #0891b2;

    /* Backgrounds */
    --scf-bg:            #f8fafc;
    --scf-surface:       #ffffff;
    --scf-surface-alt:   #f1f5f9;
    --scf-border:        #e2e8f0;
    --scf-border-focus:  #93c5fd;

    /* Text */
    --scf-text:          #0f172a;
    --scf-text-muted:    #64748b;
    --scf-text-subtle:   #94a3b8;
    --scf-text-inverse:  #ffffff;

    /* Spacing */
    --scf-space-1:       0.25rem;
    --scf-space-2:       0.5rem;
    --scf-space-3:       0.75rem;
    --scf-space-4:       1rem;
    --scf-space-6:       1.5rem;
    --scf-space-8:       2rem;
    --scf-space-12:      3rem;

    /* Typography */
    --scf-font-sans:     system-ui, -apple-system, "Segoe UI", sans-serif;
    --scf-font-mono:     ui-monospace, "Cascadia Code", "Fira Code", monospace;
    --scf-font-size:     0.9375rem;
    --scf-line-height:   1.6;
    --scf-radius:        0.5rem;
    --scf-radius-sm:     0.25rem;
    --scf-radius-lg:     0.75rem;

    /* Shadows */
    --scf-shadow-sm:     0 1px 3px rgba(0,0,0,.08);
    --scf-shadow:        0 4px 12px rgba(0,0,0,.10);
    --scf-shadow-lg:     0 10px 30px rgba(0,0,0,.14);

    /* Transitions */
    --scf-transition:    150ms ease;
}

/* ============================================================
   BASE RESET (scoped)
   ============================================================ */
.scf-wrap *, .scf-wrap *::before, .scf-wrap *::after {
    box-sizing: border-box;
}
.scf-wrap {
    font-family: var(--scf-font-sans);
    font-size: var(--scf-font-size);
    line-height: var(--scf-line-height);
    color: var(--scf-text);
    background: var(--scf-bg);
}

/* ============================================================
   LAYOUT
   ============================================================ */
.scf-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--scf-space-4);
}
.scf-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: var(--scf-space-6);
    align-items: start;
    padding: var(--scf-space-6) 0;
}
.scf-layout--full { grid-template-columns: 1fr; }
@media (max-width: 768px) {
    .scf-layout { grid-template-columns: 1fr; }
    .scf-sidebar { order: -1; }
}

/* ============================================================
   HEADER / NAV
   ============================================================ */
.scf-header {
    background: var(--scf-surface);
    border-bottom: 1px solid var(--scf-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--scf-shadow-sm);
}
.scf-header-inner {
    display: flex;
    align-items: center;
    gap: var(--scf-space-4);
    padding: var(--scf-space-3) var(--scf-space-4);
}
.scf-logo { font-weight: 700; font-size: 1.125rem; color: var(--scf-brand); text-decoration: none; }
.scf-nav { display: flex; align-items: center; gap: var(--scf-space-1); margin-left: auto; }
.scf-nav a {
    padding: var(--scf-space-2) var(--scf-space-3);
    border-radius: var(--scf-radius-sm);
    color: var(--scf-text-muted);
    text-decoration: none;
    transition: background var(--scf-transition), color var(--scf-transition);
}
.scf-nav a:hover, .scf-nav a.scf-active {
    background: var(--scf-surface-alt);
    color: var(--scf-text);
}

/* ============================================================
   CARDS / SURFACES
   ============================================================ */
.scf-card {
    background: var(--scf-surface);
    border: 1px solid var(--scf-border);
    border-radius: var(--scf-radius);
    padding: var(--scf-space-4) var(--scf-space-6);
    box-shadow: var(--scf-shadow-sm);
}
.scf-card--hover:hover { box-shadow: var(--scf-shadow); }
.scf-widget {
    background: var(--scf-surface);
    border: 1px solid var(--scf-border);
    border-radius: var(--scf-radius);
    overflow: hidden;
}
.scf-widget-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--scf-text-muted);
    padding: var(--scf-space-3) var(--scf-space-4);
    border-bottom: 1px solid var(--scf-border);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.scf-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--scf-space-2);
    padding: 0.5em 1.1em;
    border-radius: var(--scf-radius-sm);
    font-family: inherit;
    font-size: inherit;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--scf-transition);
    text-decoration: none;
    white-space: nowrap;
}
.scf-btn--primary  { background: var(--scf-brand);   color: #fff; border-color: var(--scf-brand); }
.scf-btn--primary:hover  { background: var(--scf-brand-dark); }
.scf-btn--secondary { background: transparent; color: var(--scf-brand); border-color: var(--scf-brand); }
.scf-btn--secondary:hover { background: var(--scf-brand-light); }
.scf-btn--ghost { background: transparent; color: var(--scf-text-muted); border-color: var(--scf-border); }
.scf-btn--ghost:hover { background: var(--scf-surface-alt); color: var(--scf-text); }
.scf-btn--danger { background: var(--scf-danger); color: #fff; border-color: var(--scf-danger); }
.scf-btn--sm { padding: 0.3em 0.75em; font-size: 0.8125rem; }
.scf-btn--lg { padding: 0.7em 1.5em; font-size: 1rem; }
.scf-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ============================================================
   FORMS
   ============================================================ */
.scf-form-group { margin-bottom: var(--scf-space-4); }
.scf-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--scf-space-2);
    color: var(--scf-text);
}
.scf-input, .scf-select, .scf-textarea {
    width: 100%;
    padding: 0.6em 0.85em;
    border: 1px solid var(--scf-border);
    border-radius: var(--scf-radius-sm);
    background: var(--scf-surface);
    color: var(--scf-text);
    font-family: inherit;
    font-size: inherit;
    transition: border-color var(--scf-transition), box-shadow var(--scf-transition);
}
.scf-input:focus, .scf-select:focus, .scf-textarea:focus {
    outline: none;
    border-color: var(--scf-brand);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .15);
}
.scf-textarea { resize: vertical; min-height: 100px; }
.scf-help-text { font-size: 0.8125rem; color: var(--scf-text-muted); margin-top: var(--scf-space-1); }
.scf-field-error { font-size: 0.8125rem; color: var(--scf-danger); margin-top: var(--scf-space-1); }
.scf-checkbox-label { display: flex; align-items: center; gap: var(--scf-space-2); cursor: pointer; user-select: none; }

/* ============================================================
   THREAD LIST
   ============================================================ */
.scf-thread-list { display: flex; flex-direction: column; gap: 1px; background: var(--scf-border); border-radius: var(--scf-radius); overflow: hidden; }
.scf-thread-item {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: start;
    gap: var(--scf-space-4);
    background: var(--scf-surface);
    padding: var(--scf-space-4);
    transition: background var(--scf-transition);
    text-decoration: none;
    color: inherit;
}
.scf-thread-item:hover { background: var(--scf-surface-alt); }
.scf-thread-icon { font-size: 1.25rem; line-height: 1; padding-top: 2px; }
.scf-thread-title { font-weight: 600; color: var(--scf-text); margin-bottom: var(--scf-space-1); }
.scf-thread-title a { text-decoration: none; color: inherit; }
.scf-thread-title a:hover { color: var(--scf-brand); }
.scf-thread-meta { font-size: 0.8125rem; color: var(--scf-text-muted); display: flex; flex-wrap: wrap; gap: var(--scf-space-3); align-items: center; }
.scf-thread-stats { text-align: right; font-size: 0.8125rem; color: var(--scf-text-muted); white-space: nowrap; }
.scf-thread-stats strong { display: block; font-size: 1.125rem; color: var(--scf-text); }

/* Badges */
.scf-badge {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    padding: 2px 7px;
    border-radius: 20px;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .04em;
}
.scf-badge--solved  { background: #dcfce7; color: #15803d; }
.scf-badge--pinned  { background: #fef3c7; color: #92400e; }
.scf-badge--closed  { background: #f1f5f9; color: var(--scf-text-muted); }
.scf-badge--new     { background: var(--scf-brand-light); color: var(--scf-brand); }
.scf-badge--hot     { background: #fee2e2; color: #b91c1c; }
.scf-badge--important { background: #fae8ff; color: #7e22ce; }

/* ============================================================
   THREAD DETAIL
   ============================================================ */
.scf-thread-header { margin-bottom: var(--scf-space-6); }
.scf-thread-header h1 { font-size: 1.5rem; font-weight: 700; margin: 0 0 var(--scf-space-3); }
.scf-thread-actions { display: flex; gap: var(--scf-space-2); flex-wrap: wrap; }

/* ============================================================
   POST / REPLY
   ============================================================ */
.scf-post { border: 1px solid var(--scf-border); border-radius: var(--scf-radius); overflow: hidden; margin-bottom: var(--scf-space-4); }
.scf-post--solution { border-color: var(--scf-success); }
.scf-post-header {
    display: flex;
    align-items: center;
    gap: var(--scf-space-3);
    padding: var(--scf-space-3) var(--scf-space-4);
    background: var(--scf-surface-alt);
    border-bottom: 1px solid var(--scf-border);
}
.scf-post-avatar { width: 36px; height: 36px; border-radius: 50%; object-fit: cover; flex-shrink: 0; }
.scf-post-author { font-weight: 600; }
.scf-post-date { font-size: 0.8125rem; color: var(--scf-text-muted); margin-left: auto; }
.scf-post-body { padding: var(--scf-space-4) var(--scf-space-6); }
.scf-post-footer {
    display: flex;
    align-items: center;
    gap: var(--scf-space-3);
    padding: var(--scf-space-2) var(--scf-space-4);
    border-top: 1px solid var(--scf-border);
    background: var(--scf-surface-alt);
}
.scf-solution-banner {
    display: flex;
    align-items: center;
    gap: var(--scf-space-2);
    background: #f0fdf4;
    border-bottom: 1px solid #86efac;
    padding: var(--scf-space-2) var(--scf-space-4);
    font-weight: 600;
    color: var(--scf-success);
    font-size: 0.875rem;
}

/* ============================================================
   REACTIONS
   ============================================================ */
.scf-reactions { display: flex; gap: var(--scf-space-2); flex-wrap: wrap; }
.scf-reaction-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border: 1px solid var(--scf-border);
    border-radius: 20px;
    background: transparent;
    font-family: inherit;
    font-size: 0.8125rem;
    cursor: pointer;
    transition: all var(--scf-transition);
    color: var(--scf-text-muted);
}
.scf-reaction-btn:hover { border-color: var(--scf-brand); color: var(--scf-brand); background: var(--scf-brand-light); }
.scf-reaction-btn--active { border-color: var(--scf-brand); color: var(--scf-brand); background: var(--scf-brand-light); font-weight: 600; }

/* ============================================================
   PROSE (rendered markdown)
   ============================================================ */
.scf-prose { line-height: 1.7; }
.scf-prose h1, .scf-prose h2, .scf-prose h3, .scf-prose h4 { margin: 1.5em 0 .5em; line-height: 1.3; }
.scf-prose p { margin: 0 0 1em; }
.scf-prose a { color: var(--scf-brand); }
.scf-prose code {
    background: var(--scf-surface-alt);
    border: 1px solid var(--scf-border);
    border-radius: 3px;
    padding: 1px 5px;
    font-family: var(--scf-font-mono);
    font-size: .875em;
}
.scf-prose pre {
    background: #0f172a;
    color: #e2e8f0;
    border-radius: var(--scf-radius);
    padding: var(--scf-space-4);
    overflow-x: auto;
    margin: 1em 0;
}
.scf-prose pre code { background: none; border: none; padding: 0; font-size: .875rem; color: inherit; }
.scf-prose blockquote {
    border-left: 3px solid var(--scf-brand);
    margin: 1em 0;
    padding: .5em var(--scf-space-4);
    color: var(--scf-text-muted);
    background: var(--scf-surface-alt);
    border-radius: 0 var(--scf-radius-sm) var(--scf-radius-sm) 0;
}
.scf-prose ul, .scf-prose ol { padding-left: 1.5em; margin-bottom: 1em; }
.scf-prose li { margin-bottom: .25em; }
.scf-prose hr { border: none; border-top: 1px solid var(--scf-border); margin: 1.5em 0; }
.scf-prose img { max-width: 100%; border-radius: var(--scf-radius-sm); }
.scf-prose table { width: 100%; border-collapse: collapse; margin-bottom: 1em; }
.scf-prose th, .scf-prose td { padding: .4em .75em; border: 1px solid var(--scf-border); }
.scf-prose th { background: var(--scf-surface-alt); font-weight: 600; }

/* ============================================================
   EDITOR
   ============================================================ */
.scf-editor-wrap { border: 1px solid var(--scf-border); border-radius: var(--scf-radius); overflow: hidden; background: var(--scf-surface); }
.scf-editor-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 2px;
    padding: var(--scf-space-2);
    background: var(--scf-surface-alt);
    border-bottom: 1px solid var(--scf-border);
}
.scf-toolbar-btn {
    padding: 4px 8px;
    border: 1px solid transparent;
    border-radius: var(--scf-radius-sm);
    background: transparent;
    font-family: inherit;
    font-size: 0.875rem;
    cursor: pointer;
    color: var(--scf-text-muted);
    line-height: 1;
}
.scf-toolbar-btn:hover { background: var(--scf-border); color: var(--scf-text); }
.scf-editor-wrap textarea.scf-editor { border: none; border-radius: 0; box-shadow: none; resize: vertical; padding: var(--scf-space-3); }
.scf-editor-wrap textarea.scf-editor:focus { box-shadow: none; }
.scf-editor-preview { padding: var(--scf-space-3) var(--scf-space-4); min-height: 80px; }
.scf-draft-status { display: block; padding: 2px var(--scf-space-3); font-size: 0.75rem; color: var(--scf-text-subtle); background: var(--scf-surface-alt); border-top: 1px solid var(--scf-border); }

/* ============================================================
   NOTIFICATIONS
   ============================================================ */
#scf-notif-wrap { position: relative; }
#scf-notif-panel {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    width: 340px;
    max-height: 460px;
    overflow-y: auto;
    background: var(--scf-surface);
    border: 1px solid var(--scf-border);
    border-radius: var(--scf-radius);
    box-shadow: var(--scf-shadow-lg);
    z-index: 200;
}
.scf-notif-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--scf-danger);
    color: #fff;
    font-size: 0.6875rem;
    font-weight: 700;
    vertical-align: top;
    margin-left: -6px;
}
.scf-notif-badge--hidden { display: none; }
.scf-notif-list { list-style: none; margin: 0; padding: 0; }
.scf-notif-item { border-bottom: 1px solid var(--scf-border); }
.scf-notif-item--unread { background: #eff6ff; }
.scf-notif-link { display: block; padding: var(--scf-space-3) var(--scf-space-4); text-decoration: none; color: var(--scf-text); }
.scf-notif-link:hover { background: var(--scf-surface-alt); }
.scf-notif-body { display: block; font-size: 0.875rem; }
.scf-notif-time { display: block; font-size: 0.75rem; color: var(--scf-text-muted); margin-top: 2px; }
.scf-notif-empty { padding: var(--scf-space-4); color: var(--scf-text-muted); text-align: center; }

/* ============================================================
   POLLS
   ============================================================ */
.scf-poll-form, .scf-poll-results {
    background: var(--scf-surface-alt);
    border: 1px solid var(--scf-border);
    border-radius: var(--scf-radius);
    padding: var(--scf-space-4) var(--scf-space-6);
    margin: var(--scf-space-4) 0;
}
.scf-poll-question { font-weight: 700; font-size: 1rem; margin: 0 0 var(--scf-space-3); }
.scf-poll-options, .scf-poll-options-results { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: var(--scf-space-2); }
.scf-poll-option label { display: flex; align-items: center; gap: var(--scf-space-2); cursor: pointer; padding: var(--scf-space-2) var(--scf-space-3); border-radius: var(--scf-radius-sm); border: 1px solid var(--scf-border); background: var(--scf-surface); transition: border-color var(--scf-transition); }
.scf-poll-option label:hover { border-color: var(--scf-brand); }
.scf-poll-option-result { display: grid; grid-template-columns: 1fr auto; gap: var(--scf-space-2); align-items: center; }
.scf-poll-option-result.scf-poll-option--voted .scf-poll-option-label { font-weight: 700; color: var(--scf-brand); }
.scf-poll-bar-wrap { grid-column: 1/-1; height: 8px; background: var(--scf-border); border-radius: 4px; overflow: hidden; }
.scf-poll-bar { height: 100%; background: var(--scf-brand); border-radius: 4px; transition: width 600ms ease; }
.scf-poll-pct { font-size: 0.8125rem; color: var(--scf-text-muted); text-align: right; }
.scf-poll-meta { font-size: 0.8125rem; color: var(--scf-text-muted); margin-bottom: var(--scf-space-3); }

/* ============================================================
   SEARCH
   ============================================================ */
.scf-search-wrap { position: relative; }
.scf-search-input-wrap { display: flex; }
#scf-search-input { border-radius: var(--scf-radius-sm) 0 0 var(--scf-radius-sm); }
#scf-search-submit { border-radius: 0 var(--scf-radius-sm) var(--scf-radius-sm) 0; }
#scf-search-suggestions {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--scf-surface);
    border: 1px solid var(--scf-border);
    border-top: none;
    border-radius: 0 0 var(--scf-radius-sm) var(--scf-radius-sm);
    box-shadow: var(--scf-shadow);
    list-style: none;
    margin: 0;
    padding: 0;
    z-index: 50;
}
.scf-suggestion-item { padding: var(--scf-space-2) var(--scf-space-4); cursor: pointer; font-size: 0.875rem; }
.scf-suggestion-item:hover { background: var(--scf-surface-alt); }
.scf-suggestion-type { font-size: 0.6875rem; text-transform: uppercase; color: var(--scf-text-muted); background: var(--scf-border); padding: 1px 5px; border-radius: 3px; margin-right: 4px; }

/* ============================================================
   PAGINATION
   ============================================================ */
.scf-pagination { display: flex; align-items: center; gap: var(--scf-space-1); justify-content: center; padding: var(--scf-space-6) 0; }
.scf-pagination a, .scf-pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 var(--scf-space-2);
    border: 1px solid var(--scf-border);
    border-radius: var(--scf-radius-sm);
    text-decoration: none;
    color: var(--scf-text-muted);
    font-size: 0.875rem;
    transition: all var(--scf-transition);
}
.scf-pagination a:hover { border-color: var(--scf-brand); color: var(--scf-brand); background: var(--scf-brand-light); }
.scf-pagination .scf-current { background: var(--scf-brand); color: #fff; border-color: var(--scf-brand); font-weight: 700; }

/* ============================================================
   TAGS
   ============================================================ */
.scf-tags { display: flex; flex-wrap: wrap; gap: var(--scf-space-1); }
.scf-tag {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    text-decoration: none;
    background: var(--scf-surface-alt);
    color: var(--scf-text-muted);
    border: 1px solid var(--scf-border);
    transition: all var(--scf-transition);
}
.scf-tag:hover { background: var(--scf-brand-light); color: var(--scf-brand); border-color: var(--scf-brand); }
.scf-tag--remove { cursor: pointer; margin-left: 4px; opacity: .5; }
.scf-tag--remove:hover { opacity: 1; }

/* ============================================================
   MENTION DROPDOWN
   ============================================================ */
.scf-mention-dropdown {
    list-style: none;
    margin: 0;
    padding: var(--scf-space-2) 0;
    background: var(--scf-surface);
    border: 1px solid var(--scf-border);
    border-radius: var(--scf-radius);
    box-shadow: var(--scf-shadow);
    max-height: 200px;
    overflow-y: auto;
    z-index: 100;
    position: absolute;
    min-width: 200px;
}
.scf-mention-item { padding: var(--scf-space-2) var(--scf-space-3); cursor: pointer; display: flex; align-items: center; gap: var(--scf-space-2); font-size: 0.875rem; }
.scf-mention-item:hover { background: var(--scf-surface-alt); }
.scf-mention-item img { border-radius: 50%; }

/* ============================================================
   MODALS
   ============================================================ */
.scf-modal-wrap { position: fixed; inset: 0; z-index: 1000; display: flex; align-items: center; justify-content: center; }
.scf-modal-overlay { position: absolute; inset: 0; background: rgba(0,0,0,.5); }
.scf-modal {
    position: relative;
    background: var(--scf-surface);
    border-radius: var(--scf-radius-lg);
    box-shadow: var(--scf-shadow-lg);
    padding: var(--scf-space-8);
    width: min(90vw, 520px);
    max-height: 90vh;
    overflow-y: auto;
}
.scf-modal-close {
    position: absolute;
    top: var(--scf-space-4);
    right: var(--scf-space-4);
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--scf-text-muted);
    line-height: 1;
}
.scf-modal h3 { margin: 0 0 var(--scf-space-4); font-size: 1.125rem; }

/* ============================================================
   TOAST
   ============================================================ */
#scf-toast-container {
    position: fixed;
    bottom: var(--scf-space-6);
    right: var(--scf-space-6);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--scf-space-2);
    pointer-events: none;
}
.scf-toast {
    padding: var(--scf-space-3) var(--scf-space-4);
    border-radius: var(--scf-radius);
    color: #fff;
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: var(--scf-shadow-lg);
    transform: translateX(120%);
    transition: transform 250ms ease;
    max-width: 320px;
    pointer-events: all;
}
.scf-toast--visible { transform: translateX(0); }
.scf-toast--info    { background: var(--scf-info); }
.scf-toast--success { background: var(--scf-success); }
.scf-toast--warning { background: var(--scf-warning); }
.scf-toast--error   { background: var(--scf-danger); }

/* ============================================================
   AVATAR / PROFILE
   ============================================================ */
.scf-avatar { border-radius: 50%; object-fit: cover; display: block; }
.scf-avatar--sm  { width: 28px; height: 28px; }
.scf-avatar--md  { width: 40px; height: 40px; }
.scf-avatar--lg  { width: 80px; height: 80px; }
.scf-avatar--xl  { width: 120px; height: 120px; }
.scf-user-handle { font-size: 0.8125rem; color: var(--scf-text-muted); }

/* ============================================================
   FILE LIST
   ============================================================ */
.scf-file-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: var(--scf-space-4); }
.scf-file-card { border: 1px solid var(--scf-border); border-radius: var(--scf-radius); overflow: hidden; background: var(--scf-surface); transition: box-shadow var(--scf-transition); }
.scf-file-card:hover { box-shadow: var(--scf-shadow); }
.scf-file-thumb { width: 100%; height: 120px; object-fit: cover; background: var(--scf-surface-alt); display: flex; align-items: center; justify-content: center; font-size: 2rem; }
.scf-file-meta { padding: var(--scf-space-3); }
.scf-file-name { font-weight: 600; font-size: 0.875rem; margin-bottom: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.scf-file-size { font-size: 0.75rem; color: var(--scf-text-muted); }

/* ============================================================
   UTILITIES
   ============================================================ */
.scf-sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0; }
.scf-text-muted { color: var(--scf-text-muted); }
.scf-text-small { font-size: 0.8125rem; }
.scf-flex { display: flex; align-items: center; }
.scf-gap-2 { gap: var(--scf-space-2); }
.scf-gap-3 { gap: var(--scf-space-3); }
.scf-gap-4 { gap: var(--scf-space-4); }
.scf-mt-4 { margin-top: var(--scf-space-4); }
.scf-mb-4 { margin-bottom: var(--scf-space-4); }
.scf-divider { border: none; border-top: 1px solid var(--scf-border); margin: var(--scf-space-6) 0; }