/* ==========================================================================
   Exuad — Design System
   A math-motion studio. Palette reads like plotted ink on dark paper.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
    /* Surface */
    --void:        #08090c;
    --bg-main:     #0b0d11;
    --bg-panel:    #101319;
    --bg-panel-2:  #0d1015;
    --bg-inset:    #08090c;
    --border:      #1c2028;
    --border-soft: #171a21;
    --border-hi:   #2a2f3a;

    /* Text */
    --text-primary:   #e9e7e1;
    --text-secondary: #9a988f;
    --text-tertiary:  #5f6169;

    /* Accent — sage ink, not a stock dev-tool blue/green */
    --accent:       #8fb39a;
    --accent-dim:   #6d8b7a;
    --accent-glow:  rgba(143, 179, 154, 0.14);
    --accent-text:  #a7c9b3;

    /* Semantic */
    --danger:      #d97b6c;
    --danger-glow: rgba(217, 123, 108, 0.12);
    --warn:        #d9b26c;

    /* Type */
    --font-display: 'Fraunces', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;

    --radius-sm: 5px;
    --radius-md: 8px;
    --radius-lg: 14px;
}

* { box-sizing: border-box; }

html, body {
    height: 100%;
}

body {
    background-color: var(--bg-main);
    background-image:
        radial-gradient(ellipse 900px 500px at 15% -10%, rgba(143, 179, 154, 0.05), transparent 60%),
        radial-gradient(ellipse 700px 500px at 100% 0%, rgba(143, 179, 154, 0.035), transparent 55%);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 13px;
    letter-spacing: -0.01em;
    -webkit-font-smoothing: antialiased;
}

.font-display { font-family: var(--font-display); }
.font-mono { font-family: var(--font-mono); }

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }
}

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border-hi);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: #3a4150;
}

/* ==========================================================================
   Header
   ========================================================================== */

.app-header {
    background: linear-gradient(180deg, #0d1015 0%, #0b0d11 100%);
    border-bottom: 1px solid var(--border);
}

.brand-mark {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
}

.brand-name {
    font-family: var(--font-display);
    font-size: 16px;
    font-weight: 500;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

.brand-tagline {
    font-size: 11px;
    color: var(--text-tertiary);
    font-weight: 400;
    padding-left: 10px;
    margin-left: 10px;
    border-left: 1px solid var(--border);
}

/* ==========================================================================
   Panels & Inputs
   ========================================================================== */

.input-panel {
    background-color: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

.panel-title {
    font-family: var(--font-body);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-tertiary);
}

.studio-input {
    background-color: var(--bg-inset);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    padding: 7px 10px;
    font-size: 12.5px;
    font-family: var(--font-body);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
    width: 100%;
}

.studio-input.font-mono {
    font-size: 12px;
}

.studio-input:hover {
    border-color: var(--border-hi);
}

.studio-input:focus {
    outline: none;
    border-color: var(--accent-dim);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.studio-input::placeholder {
    color: var(--text-tertiary);
}

select.studio-input {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6' fill='none'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%235f6169' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 28px;
}

.studio-label {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 5px;
    display: block;
}

.studio-checkbox {
    appearance: none;
    width: 15px;
    height: 15px;
    border-radius: 4px;
    border: 1.5px solid var(--border-hi);
    background: var(--bg-inset);
    cursor: pointer;
    position: relative;
    flex-shrink: 0;
    transition: all 0.15s ease;
}

.studio-checkbox:checked {
    background: var(--accent-dim);
    border-color: var(--accent-dim);
}

.studio-checkbox:checked::after {
    content: '';
    position: absolute;
    left: 4px;
    top: 1px;
    width: 4px;
    height: 8px;
    border: solid var(--void);
    border-width: 0 1.5px 1.5px 0;
    transform: rotate(45deg);
}

.studio-checkbox:hover {
    border-color: var(--accent-dim);
}

.toggle-tile {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-inset);
    padding: 9px 10px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: border-color 0.15s ease, background 0.15s ease;
}

.toggle-tile:hover {
    border-color: var(--border-hi);
    background: #0a0c11;
}

.toggle-tile span {
    font-size: 12px;
    color: var(--text-secondary);
}

.toggle-tile:has(.studio-checkbox:checked) span {
    color: var(--text-primary);
}

.field-divider {
    border-top: 1px solid var(--border-soft);
    padding-top: 14px;
    margin-top: 2px;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    font-size: 12px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    padding: 8px 14px;
    transition: all 0.15s ease;
    border: 1px solid transparent;
    cursor: pointer;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-ghost {
    background: var(--bg-inset);
    color: var(--text-secondary);
    border-color: var(--border);
}
.btn-ghost:hover:not(:disabled) {
    color: var(--text-primary);
    border-color: var(--border-hi);
    background: #0d1015;
}

.btn-subtle {
    background: transparent;
    color: var(--text-tertiary);
    border-color: transparent;
}
.btn-subtle:hover:not(:disabled) {
    color: var(--text-secondary);
    background: var(--bg-inset);
}

.btn-primary {
    background: var(--accent-dim);
    color: #0a0c0a;
    font-weight: 600;
    box-shadow: 0 1px 0 rgba(255,255,255,0.08) inset;
}
.btn-primary:hover:not(:disabled) {
    background: var(--accent);
}

.btn-danger-ghost {
    background: transparent;
    color: var(--text-tertiary);
    border-color: var(--border);
}
.btn-danger-ghost:hover:not(:disabled) {
    color: var(--danger);
    border-color: var(--danger);
    background: var(--danger-glow);
}

.btn-block { width: 100%; }
.btn-lg { padding: 10px 16px; font-size: 12.5px; }

/* ==========================================================================
   CodeMirror — clean, quiet, professional
   ========================================================================== */

.CodeMirror {
    height: 100% !important;
    font-family: var(--font-mono) !important;
    font-size: 12.5px !important;
    line-height: 1.6 !important;
    border-radius: var(--radius-md);
    background: var(--bg-inset) !important;
}

.cm-s-dracula.CodeMirror {
    background: var(--bg-inset) !important;
    color: #d8dae0 !important;
}
.cm-s-dracula .CodeMirror-gutters {
    background: var(--bg-inset) !important;
    border-right: 1px solid var(--border-soft) !important;
}
.CodeMirror-linenumber {
    color: var(--text-tertiary) !important;
}
.cm-s-dracula .CodeMirror-cursor {
    border-left: 1.5px solid var(--accent) !important;
}
.cm-s-dracula div.CodeMirror-selected {
    background: rgba(143, 179, 154, 0.12) !important;
}

.cm-s-dracula span.cm-keyword { color: #c99bdb !important; font-weight: 500; }
.cm-s-dracula span.cm-builtin { color: #7fb8c4 !important; }
.cm-s-dracula span.cm-def { color: var(--accent-text) !important; }
.cm-s-dracula span.cm-variable { color: #d8dae0 !important; }
.cm-s-dracula span.cm-string { color: #d4c98f !important; }
.cm-s-dracula span.cm-number { color: #b3a1e0 !important; }
.cm-s-dracula span.cm-comment { color: var(--text-tertiary) !important; font-style: italic; }
.cm-s-dracula span.cm-operator { color: #c99bdb !important; }
.cm-s-dracula span.cm-property { color: #7fb8c4 !important; }

/* ==========================================================================
   Tab Navigation
   ========================================================================== */

.nav-tab {
    position: relative;
    color: var(--text-tertiary);
    font-size: 12.5px;
    font-weight: 500;
    padding: 12px 4px;
    margin-right: 22px;
    border: none;
    background: none;
    cursor: pointer;
    transition: color 0.15s ease;
}
.nav-tab::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -1px;
    height: 2px;
    background: var(--accent);
    transform: scaleX(0);
    transition: transform 0.2s ease;
}
.nav-tab:hover {
    color: var(--text-secondary);
}
.nav-tab.active {
    color: var(--text-primary);
}
.nav-tab.active::after {
    transform: scaleX(1);
}

/* ==========================================================================
   Misc components
   ========================================================================== */

.terminal-box {
    background-color: var(--bg-inset);
    border: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 11px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.terminal-box .log-line-error { color: var(--danger); }
.terminal-box .log-line-ok { color: var(--accent-text); }

.status-pill {
    font-size: 10.5px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 2px 8px;
    border-radius: 999px;
}
.status-pill.idle { color: var(--text-tertiary); background: var(--bg-inset); border: 1px solid var(--border); }
.status-pill.busy { color: var(--warn); background: rgba(217, 178, 108, 0.1); border: 1px solid rgba(217, 178, 108, 0.25); }
.status-pill.ok { color: var(--accent-text); background: var(--accent-glow); border: 1px solid rgba(143, 179, 154, 0.3); }
.status-pill.err { color: var(--danger); background: var(--danger-glow); border: 1px solid rgba(217, 123, 108, 0.3); }

.notice-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    font-size: 11.5px;
    border: 1px solid;
}
.notice-banner.info {
    background: var(--accent-glow);
    border-color: rgba(143, 179, 154, 0.28);
    color: var(--accent-text);
}
.notice-banner.error {
    background: var(--danger-glow);
    border-color: rgba(217, 123, 108, 0.3);
    color: var(--danger);
}
.notice-banner a.link-action {
    color: inherit;
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 2px;
    cursor: pointer;
    flex-shrink: 0;
}

.empty-plot {
    width: 100%;
    max-width: 320px;
    opacity: 0.55;
    margin: 0 auto 18px;
    display: block;
}
.empty-plot path {
    stroke-dasharray: 340;
    stroke-dashoffset: 340;
    animation: draw-curve 2.4s ease forwards 0.2s;
}
@keyframes draw-curve {
    to { stroke-dashoffset: 0; }
}
@media (prefers-reduced-motion: reduce) {
    .empty-plot path { animation: none; stroke-dashoffset: 0; }
}

.skeleton-line {
    height: 10px;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--border-soft) 25%, var(--border) 50%, var(--border-soft) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.4s ease infinite;
}
@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}
@media (prefers-reduced-motion: reduce) {
    .skeleton-line { animation: none; }
}

.card-video-frame {
    background: var(--void);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px -20px rgba(0,0,0,0.6);
}

.spinner {
    width: 13px;
    height: 13px;
    border-radius: 50%;
    border: 2px solid rgba(0,0,0,0.25);
    border-top-color: rgba(0,0,0,0.75);
    animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.view-fade {
    animation: fadeIn 0.18s ease;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(2px); }
    to { opacity: 1; transform: translateY(0); }
}

aside::-webkit-scrollbar { width: 5px; }