/* ═══════════════════════════════════════════════
   shared/base.css — Shared styles for all a9l.im sites
   ═══════════════════════════════════════════════ */

/* ─── Reset ─── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-variation-settings: 'MONO' 0, 'CASL' 0;
}

/* ─── Layout Tokens ─── */
:root {
    --radius: 2px;

    --font-sm: 0.78rem;
    --font-base: 0.85rem;
    --font-lg: 0.95rem;

    --toolbar-h: 52px;
    --panel-w: 360px;

    --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ─── Body Base ─── */
body {
    background: var(--bg-canvas);
    color: var(--text);
    font-family: var(--font-mono);
    font-variation-settings: 'MONO' 0, 'CASL' 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.5s var(--ease-out), color 0.4s var(--ease-out);
}

/* ─── Glass Panel ─── */
.glass {
    background: var(--bg-panel);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: none;
    box-shadow: none;
    transition: box-shadow 0.2s var(--ease-out), background 0.2s var(--ease-out);
}

/* ─── Tool Buttons ─── */
.tool-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    background: transparent;
    border: none;
    border-radius: var(--radius);
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    flex-shrink: 0;
    outline: none;
    -webkit-appearance: none;
    transition: color 0.2s var(--ease-out), background 0.2s var(--ease-out), opacity 0.2s, box-shadow 0.25s var(--ease-out), transform 0.3s var(--ease-out);
}

.tool-btn svg {
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: square;
    stroke-linejoin: miter;
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.tool-btn:hover {
    color: var(--text);
    transform: translateY(-2px);
}

.tool-btn:active {
    transform: scale(0.92);
    transition-duration: 0.05s;
}

.tool-btn:focus-visible {
    outline: 2px solid var(--accent-glow);
    outline-offset: 3px;
}

.tool-btn.active {
    color: var(--accent);
}


.tool-btn:disabled,
.tool-btn[disabled] {
    opacity: 0.22;
    cursor: default;
    pointer-events: none;
}

/* ─── Speed Button ─── */
.speed-btn {
    font-family: var(--font-mono);
    font-size: var(--font-sm);
    font-weight: 600;
    min-width: 34px;
}

/* ─── Keyframes ─── */
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-16px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-24px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(24px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes paletteEnter {
    from { opacity: 0; transform: translateX(-50%) translateY(12px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ─── Sidebar Patterns ─── */
.group-label {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: var(--font-base);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-muted);
    padding-bottom: 2px;
}

.stats-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 16px 12px;
    flex-shrink: 0;
}

.stats-title {
    font-family: var(--font-sans);
    font-size: var(--font-base);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.10em;
    color: var(--text);
}

.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 8px;
    margin-bottom: 1px;
    border-radius: var(--radius);
    transition: background 0.2s var(--ease-out), transform 0.2s var(--ease-out), color 0.2s var(--ease-out);
}

.stat-row:hover {
    background: var(--bg-hover);
    transform: translateX(2px);
}

.stat-label {
    font-size: var(--font-base);
    color: var(--text-secondary);
    font-weight: 400;
}

.stat-value {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: var(--font-base);
    color: var(--text);
    min-width: 2em;
    text-align: right;
    transition: transform 0.15s var(--ease-out);
    display: inline-block;
    font-variant-numeric: tabular-nums;
}

.stat-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 10px;
}
.stat-group:last-child {
    margin-bottom: 0;
}

/* ─── Tab System ─── */
.sidebar-tabs {
    display: flex;
    gap: 0;
    justify-content: center;
    flex: 1;
}

.tabs-wrap {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    animation: fadeUp 0.4s ease 0.15s both;
}

.tab-bar {
    display: flex;
    gap: 0;
    padding: 0 16px;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    z-index: 5;
}

.tab-btn {
    flex: 1;
    padding: 0.6rem 0.4rem 0.5rem;
    background: transparent;
    border: none;
    border-radius: 0;
    font-family: var(--font-sans);
    font-weight: 500;
    font-size: var(--font-base);
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.28s var(--ease-out);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    text-align: center;
    position: relative;
}

.tab-btn::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 0;
    transition: width 0.4s var(--ease-out), left 0.4s var(--ease-out);
}

.tab-btn:hover {
    color: var(--text-secondary);
}

.tab-btn:hover::after {
    width: 50%;
    left: 25%;
}

.tab-btn.active {
    color: var(--accent);
    font-weight: 600;
}

.tab-btn.active::after {
    width: 60%;
    left: 20%;
}

.tab-panels {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    font-variant-numeric: tabular-nums;
}

.tab-panel {
    display: none;
    padding: 10px 12px;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.2s ease both;
}

/* ─── Sim Layout Components ─── */

/* Floating toolbar */
.sim-toolbar {
    position: fixed;
    top: 12px;
    left: 12px;
    right: 12px;
    height: var(--toolbar-h);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12px 0 20px;
    gap: 1rem;
    border-radius: var(--radius);
    opacity: 0;
    pointer-events: none;
    transition: background-color 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out);
}

.app-ready .sim-toolbar {
    animation: slideDown 0.55s var(--ease-out) 0.08s both;
    pointer-events: auto;
}

/* Toolbar right-side button group */
.sim-toolbar-actions {
    display: flex;
    align-items: center;
    gap: 3px;
    flex-shrink: 0;
}

/* Vertical separator */
.tool-sep {
    width: 1px;
    height: 18px;
    background: var(--text-muted);
    margin: 0 4px;
    flex-shrink: 0;
    opacity: 0.15;
}

/* Home logo link */
.sim-home {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.sim-home img {
    height: 28px;
    width: auto;
    transition: transform 0.3s var(--ease-out);
}

.sim-home:hover img {
    transform: rotate(15deg) scale(1.1);
}

/* Ensure brand wrapper is a flex row when logo is present */
.sim-toolbar :has(> .sim-home) {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Brand title with accent gradient */
.sim-brand {
    font-family: var(--font-display);
    font-size: clamp(1.3rem, 2.5vw, 1.8rem);
    font-weight: 400;
    color: var(--text);
    letter-spacing: -0.025em;
    line-height: 1.1;
    white-space: nowrap;
}

.sim-brand em {
    font-style: italic;
    background: linear-gradient(135deg, var(--accent-light) 20%, var(--accent) 80%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Right-side floating panel */
.sim-panel {
    position: fixed;
    top: calc(12px + var(--toolbar-h) + 12px);
    right: 12px;
    bottom: 12px;
    width: var(--panel-w);
    z-index: 90;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border-radius: var(--radius);
    box-shadow: none;
    transform: translateX(calc(100% + 24px));
    transition: background-color 0.4s, box-shadow 0.3s;
}

.app-ready .sim-panel {
    transition: transform 0.55s var(--ease-out), background-color 0.4s, box-shadow 0.3s;
}

.sim-panel.open {
    transform: translateX(0);
}

/* Floating bottom pill */
.sim-bar {
    position: fixed;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    border-radius: var(--radius);
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: background-color 0.4s var(--ease-out), box-shadow 0.3s var(--ease-out), left 0.3s var(--ease-out);
}

.app-ready .sim-bar {
    animation: paletteEnter 0.5s var(--ease-out) 0.2s both;
    pointer-events: auto;
}

@media (min-width: 901px) {
    body:has(.sim-panel.open) .sim-bar {
        left: calc(50% - (var(--panel-w) + 24px) / 2);
    }
}

/* Floating left control stack */
.sim-controls {
    position: absolute;
    bottom: 12px;
    left: 16px;
    display: flex;
    flex-direction: column;
    gap: 1px;
    border-radius: var(--radius);
    padding: 3px;
    z-index: 20;
    align-items: center;
    font-variant-numeric: tabular-nums;
    opacity: 0;
    pointer-events: none;
    transition: background-color 0.4s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.app-ready .sim-controls {
    animation: slideInLeft 0.4s var(--ease-out) 0.35s both;
    pointer-events: auto;
}

/* ─── Small Utilities ─── */

/* Zoom percentage text */
.zoom-level {
    font-family: var(--font-mono);
    font-size: 0.56rem;
    font-weight: 500;
    color: var(--text-muted);
    padding: 0 4px;
    text-align: center;
    min-width: 34px;
    font-variant-numeric: tabular-nums;
    user-select: none;
    line-height: 1.5;
    letter-spacing: -0.02em;
}

/* Horizontal control separator */
.ctrl-sep {
    width: 20px;
    height: 1px;
    background: var(--bg-hover);
    margin: 2px auto;
    opacity: 0.6;
}

/* Thin scrollbar */
.scrollbar-thin {
    scrollbar-width: thin;
    scrollbar-color: var(--border-strong) transparent;
}

.scrollbar-thin::-webkit-scrollbar { width: 4px; }
.scrollbar-thin::-webkit-scrollbar-track { background: transparent; }
.scrollbar-thin::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: var(--radius); }

/* Hint text — italic caption style */
.panel-hint {
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: var(--font-sm);
    font-style: italic;
    line-height: 1.5;
    letter-spacing: 0.01em;
    margin: 0;
    padding: 2px 0 0;
    text-align: center;
}

.hidden {
    display: none !important;
}

/* ─── Global Focus & Selection ─── */
::selection {
    background: var(--accent-glow);
    color: var(--text);
}

:focus-visible {
    outline: 2px solid var(--accent-glow);
    outline-offset: 3px;
    border-radius: var(--radius);
}

/* ─── Sheet Handle (mobile bottom sheet drag handle) ─── */
.sheet-handle {
    display: none;
}

/* ─── Responsive: Primary Mobile ─── */
@media (max-width: 900px) {
    :root {
        --toolbar-h: 48px;
    }

    .sim-toolbar {
        top: 8px;
        left: 8px;
        right: 8px;
        padding: 0 8px 0 16px;
    }

    .sim-brand {
        font-size: 1.05rem;
    }

    .tool-btn svg {
        width: 16px;
        height: 16px;
    }

    .tool-sep {
        height: 14px;
        margin: 0 2px;
    }

    /* Bottom sheet touch optimizations */
    .sim-panel {
        will-change: transform;
        overscroll-behavior: contain;
    }

    .tabs-wrap { min-height: auto; }
    .tab-bar { position: static; }
    .tab-panels { max-height: calc(60vh - 120px); }

    /* Sheet handle — visible on mobile */
    .sheet-handle {
        display: flex;
        justify-content: center;
        padding: 12px 0 8px;
        cursor: grab;
        flex-shrink: 0;
        touch-action: none;
    }

    .sheet-handle::after {
        content: '';
        width: 40px;
        height: 4px;
        background: var(--border-strong);
        border-radius: var(--radius);
        transition: width 0.2s var(--ease-out), background 0.2s;
    }

    .sheet-handle:active {
        cursor: grabbing;
    }

    .sheet-handle:active::after {
        width: 48px;
        background: var(--text-muted);
    }
}

/* ─── Responsive: Small Phone ─── */
@media (max-width: 600px) {
    .sim-brand {
        font-size: 0.92rem;
    }

    .tool-btn {
        width: 32px;
        height: 32px;
    }

    .sim-toolbar-actions {
        gap: 2px;
    }

    .tool-sep {
        margin: 0 1px;
    }
}

/* ─── Responsive: Minimal UI ─── */
@media (max-width: 440px) {
    .hide-sm {
        display: none !important;
    }

    .sim-brand {
        display: none;
    }

    .sim-toolbar-actions {
        gap: 1px;
    }
}

/* ─── Toast Notifications ─── */
#toast-container {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    pointer-events: none;
    transition: left 0.3s var(--ease-out);
}
@media (min-width: 901px) {
    body:has(.sim-panel.open) #toast-container {
        left: calc(50% - (var(--panel-w) + 24px) / 2);
    }
}

.toast {
    padding: 8px 24px;
    border-radius: var(--radius);
    background: var(--bg-panel);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: none;
    color: var(--text);
    font: 500 var(--font-base) var(--font-sans);
    box-shadow: var(--shadow-hover);
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.3s var(--ease-out), transform 0.3s var(--ease-out);
    pointer-events: auto;
    max-width: min(460px, 85vw);
}
.toast.toast-multiline {
    border-radius: var(--radius);
    padding: 12px 20px;
    line-height: 1.45;
}

.toast.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ─── Accessibility ─── */
.skip-link {
    position: fixed;
    top: -100%;
    left: 16px;
    z-index: 10000;
    padding: 8px 16px;
    background: var(--accent);
    color: var(--text-on-accent);
    font: 500 var(--font-lg) var(--font-sans);
    border-radius: var(--radius);
    text-decoration: none;
    transition: top 0.2s var(--ease-out);
}

.skip-link:focus {
    top: 16px;
}

.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;
}

/* ─── Info Tip Triggers ─── */
.info-trigger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: none;
    background: var(--bg-hover);
    color: var(--text-muted);
    font-size: var(--font-sm);
    font-weight: 700;
    font-family: var(--font-sans);
    cursor: help;
    padding: 0;
    margin-left: 4px;
    flex-shrink: 0;
    line-height: 1;
    vertical-align: middle;
    transition: color 0.2s var(--ease-out), background 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
}

.info-trigger:hover,
.info-trigger:focus-visible {
    color: var(--accent);
    background: var(--accent-subtle);
    box-shadow: var(--shadow-hover);
}

/* ─── Sim Tooltip (cursor-following) ─── */
.sim-tooltip {
    position: fixed;
    z-index: 200;
    padding: 6px 10px;
    border-radius: var(--radius);
    background: var(--bg-panel-solid);
    border: none;
    box-shadow: none;
    font: 500 var(--font-sm) / 1.55 var(--font-mono);
    color: var(--text);
    pointer-events: none;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.12s var(--ease-in-out), transform 0.12s var(--ease-in-out);
}

.sim-tooltip.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ─── Info Tip Popovers ─── */
.info-popover {
    position: fixed;
    z-index: 9000;
    padding: 10px 14px;
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: var(--font-base);
    line-height: 1.55;
    color: var(--text);
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.2s var(--ease-out), transform 0.2s var(--ease-out);
    pointer-events: none;
}

.info-popover-below {
    transform: translateY(-4px);
}

.info-popover-visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.info-popover-title {
    font-weight: 600;
    font-size: var(--font-base);
    margin-bottom: 4px;
    color: var(--text);
}

.info-popover-body {
    color: var(--text-secondary);
}

.info-popover-body .katex {
    font-size: 1.05em;
}

.info-popover-body .katex-display {
    overflow-x: auto;
    margin: 0.4em 0;
}

.info-popover-close {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    padding: 0;
    border-radius: 50%;
    transition: color 0.15s, background 0.15s;
}

.info-popover-close:hover {
    color: var(--text);
    background: var(--bg-hover);
}

/* ─── About Overlay ─── */
.about-overlay {
    position: fixed;
    inset: 0;
    z-index: 9500;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 0;
    transition: opacity 0.3s var(--ease-out);
    pointer-events: none;
}

.about-overlay-visible {
    opacity: 1;
    pointer-events: auto;
}

.about-content {
    border-radius: var(--radius);
    padding: 24px 28px;
    max-width: 480px;
    width: 90vw;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: none;
    transform: translateY(8px) scale(0.98);
    transition: transform 0.3s var(--ease-out), opacity 0.3s var(--ease-out);
}

.about-overlay-visible .about-content {
    transform: translateY(0) scale(1);
}

.about-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.about-header h2 {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
}

.about-desc {
    font-size: var(--font-lg);
    line-height: 1.55;
    color: var(--text-secondary);
    margin: 0 0 16px;
}

.about-section {
    padding-bottom: 16px;
    margin-bottom: 16px;
}

.about-section:last-of-type {
    margin-bottom: 0;
    padding-bottom: 0;
}

.about-group-label {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: var(--font-sm);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-muted);
    margin-bottom: 8px;
    padding-bottom: 4px;
}

.about-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 5px 0;
}

.about-label {
    font-size: var(--font-base);
    color: var(--text-secondary);
}

.about-key {
    display: inline-block;
    padding: 3px 9px;
    border-radius: var(--radius);
    border: none;
    background: var(--bg-elevated);
    font-family: var(--font-mono);
    font-size: var(--font-sm);
    color: var(--text);
    min-width: 24px;
    text-align: center;
    white-space: nowrap;
}

.about-value {
    font-family: var(--font-mono);
    font-size: var(--font-base);
    color: var(--text);
}

.about-footer {
    padding-top: 12px;
    margin-top: 4px;
    font-size: var(--font-base);
    color: var(--text-muted);
    text-align: center;
}

.about-footer a {
    color: var(--accent);
    text-decoration: none;
}

.about-footer a:hover {
    text-decoration: underline;
}

.about-updated {
    font-size: var(--font-base);
    color: var(--text-muted);
    margin-top: 0.75rem;
    text-align: center;
}

/* ─── Educational Content ─── */
.edu-content {
    max-width: 42rem;
    margin: 2rem auto;
    padding: 0 1rem;
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.sim-body .edu-content {
    position: absolute;
    left: -9999px;
}

.edu-content summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
}

.edu-content h2,
.edu-content h3 {
    color: var(--text-primary);
    margin-top: 1.5rem;
}

/* ─── Control Rows ─── */
.ctrl-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4px 0;
}

.ctrl-row > label,
.ctrl-label {
    font-size: var(--font-base);
    color: var(--text);
    font-weight: 400;
    cursor: pointer;
}

.ctrl-sub { padding-left: 20px; }
.ctrl-sub > label { font-size: var(--font-sm); color: var(--text-secondary); }

.ctrl-disabled { opacity: 0.4; pointer-events: none; transition: opacity 0.2s var(--ease-out); }

/* ─── Dependency Reveal (shared/forms.js bindDeps) ─── */
.dep-reveal {
    display: grid;
    grid-template-rows: 1fr;
}
.dep-reveal:not(.dep-init) {
    transition: grid-template-rows 0.25s var(--ease-out);
}
.dep-reveal > * {
    overflow: hidden;
    min-height: 0;
}
.dep-reveal:not(.dep-init) > * {
    transition: opacity 0.2s var(--ease-out) 0.05s;
}
.dep-reveal.dep-hidden {
    grid-template-rows: 0fr;
    pointer-events: none;
}
.dep-reveal.dep-hidden > * {
    opacity: 0;
}
.dep-reveal.dep-hidden:not(.dep-init) > * {
    transition: opacity 0.1s var(--ease-out);
}

.ctrl-group {
    margin-bottom: 10px;
}
.ctrl-group:last-child { margin-bottom: 0; }

.panel-section {
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.panel-section:last-of-type { margin-bottom: 0; }

.stat-sub { padding-left: 20px; }
.stat-sub .stat-label { font-size: var(--font-sm); color: var(--text-muted); }
.stat-sub .stat-value { font-size: var(--font-sm); color: var(--text-secondary); }

.ctrl-row.locked { opacity: 0.4; pointer-events: none; transition: opacity 0.2s var(--ease-out); }

/* ─── Select Dropdowns ─── */
/* Native select — hidden when enhanced by shared/dropdown.js */
.sim-select {
    width: 100%;
    padding: 6px 10px;
    border-radius: var(--radius);
    border: none;
    background: var(--bg-hover);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: var(--font-base);
    transition: background 0.2s var(--ease-out), box-shadow 0.25s var(--ease-out);
}

.sim-select:focus {
    background: var(--bg-elevated);
    box-shadow: var(--shadow-hover);
    outline: 2px solid var(--accent);
    outline-offset: 0;
}

/* ─── Custom Dropdown (shared/dropdown.js) ─── */
.sim-dropdown {
    position: relative;
    width: 100%;
}

.sim-dropdown.disabled { opacity: 0.4; pointer-events: none; }

.sim-dropdown-trigger {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
    padding: 6px 10px;
    border-radius: var(--radius);
    border: none;
    background: var(--bg-hover);
    color: var(--text);
    font-family: var(--font-mono);
    font-size: var(--font-base);
    font-variant-numeric: tabular-nums;
    text-align: left;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
    transition: background 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
}

.sim-dropdown-trigger:hover {
    background: var(--bg-elevated);
}

.sim-dropdown-trigger:focus-visible {
    background: var(--bg-elevated);
    box-shadow: var(--shadow-hover);
    outline: 2px solid var(--accent);
    outline-offset: 0;
}

.sim-dropdown-chevron {
    color: var(--text-muted);
    font-size: 0.7em;
    transition: transform 0.2s var(--ease-out);
}

.sim-dropdown.open .sim-dropdown-chevron {
    transform: rotate(180deg);
}

.sim-dropdown.open .sim-dropdown-trigger {
    border-radius: var(--radius) var(--radius) 0 0;
    background: var(--bg-panel-solid);
}

.sim-dropdown-list {
    display: none;
    position: absolute;
    z-index: 300;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 240px;
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: none;
    -webkit-overflow-scrolling: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border-strong) transparent;
    background: var(--bg-panel-solid);
    border-radius: 0 0 var(--radius) var(--radius);
    padding: 2px 0;
}

.sim-dropdown.open .sim-dropdown-list {
    display: block;
    animation: dropdownIn 0.15s var(--ease-out) both;
}

.sim-dropdown.closing .sim-dropdown-list {
    animation: dropdownOut 0.15s var(--ease-in-out) both;
}

.sim-dropdown.closing .sim-dropdown-trigger {
    border-radius: var(--radius);
    background: var(--bg-hover);
}

@keyframes dropdownIn {
    from { opacity: 0; max-height: 0; }
    to   { opacity: 1; max-height: 240px; }
}

@keyframes dropdownOut {
    from { opacity: 1; max-height: 240px; }
    to   { opacity: 0; max-height: 0; }
}

.sim-dropdown-item {
    padding: 5px 10px;
    font-family: var(--font-mono);
    font-size: var(--font-base);
    font-variant-numeric: tabular-nums;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
    transition: background 0.12s var(--ease-out), color 0.12s var(--ease-out);
}

.sim-dropdown-item:hover,
.sim-dropdown-item.focused {
    background: var(--bg-hover);
    color: var(--text);
}

.sim-dropdown-item.selected {
    color: var(--accent);
    font-weight: 600;
}

.sim-dropdown-item.disabled {
    color: var(--text-muted);
    cursor: default;
    opacity: 0.4;
}

.sim-dropdown-item.disabled:hover {
    background: transparent;
    transform: none;
}

/* ─── Form Controls ─── */

/* Slider value display */
.slider-value {
    font-family: var(--font-mono);
    color: var(--text);
    font-weight: 600;
    font-size: var(--font-base);
    font-variant-numeric: tabular-nums;
}

/* Range sliders */
input[type=range] {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 100%;
    background: transparent;
    cursor: pointer;
    height: 20px;
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, var(--slider-color, var(--accent)) var(--slider-fill, 0%), var(--slider-track) var(--slider-fill, 0%));
    border-radius: 0;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: var(--slider-color, var(--accent));
    margin-top: -7px;
    border: none;
    transition: box-shadow 180ms var(--ease-in-out), transform 180ms var(--ease-in-out);
}

input[type=range]:focus::-webkit-slider-thumb {
    box-shadow: 0 0 0 4px var(--accent-subtle);
}

input[type=range]:active::-webkit-slider-thumb {
    transform: scale(1.15);
}

input[type=range]::-moz-range-track {
    width: 100%;
    height: 2px;
    background: var(--slider-track);
    border-radius: 0;
    border: none;
}

input[type=range]::-moz-range-progress {
    height: 2px;
    background: var(--slider-color, var(--accent));
    border-radius: 0;
}

input[type=range]::-moz-range-thumb {
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: var(--slider-color, var(--accent));
    border: none;
}

/* Segmented control (mode toggles) */
.mode-toggles {
    display: flex;
    gap: 2px;
    padding: 3px;
    background: var(--bg-hover);
    border-radius: var(--radius);
    position: relative;
}

.mode-indicator {
    position: absolute;
    top: 3px;
    left: 3px;
    height: calc(100% - 6px);
    border-radius: var(--radius);
    background: var(--accent);
    transition: transform 0.3s var(--ease-out), width 0.3s var(--ease-out);
    z-index: 0;
}

.mode-btn {
    flex: 1;
    background: transparent;
    border: none;
    padding: 6px 12px;
    font-family: var(--font-sans);
    font-size: var(--font-base);
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.25s var(--ease-out);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    line-height: 1;
    position: relative;
    z-index: 1;
}

.mode-btn:hover {
    color: var(--text);
}

.mode-btn.active {
    color: var(--text-on-accent);
}

/* Settings dropdown (shared/settings.js) */
.settings-dd {
    position: fixed;
    z-index: 100;
    padding: 1rem;
    border-radius: var(--radius);
    background: var(--bg-panel);
    backdrop-filter: blur(8px);
}

.settings-dd-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.settings-dd-row:last-child { margin-bottom: 0; }

.settings-dd-label {
    font-family: var(--font-sans);
    font-size: var(--font-base);
    color: var(--text-muted);
    min-width: 80px;
    flex-shrink: 0;
}

.settings-dd-val {
    font-family: var(--font-mono);
    font-size: var(--font-sm);
    color: var(--text-secondary);
    min-width: 40px;
    text-align: right;
}

.settings-dd-row .sim-slider { flex: 1; }

/* Checkbox label layout (standalone checkboxes, not .tog toggles) */
.checkbox-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 36px;
    height: 20px;
    background: var(--slider-track);
    border-radius: var(--radius);
    position: relative;
    cursor: pointer;
    transition: background 180ms var(--ease-in-out);
    flex-shrink: 0;
}

.checkbox-label input[type="checkbox"]::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 14px;
    height: 14px;
    background: var(--text-muted);
    border-radius: var(--radius);
    transition: all 180ms var(--ease-in-out);
}

.checkbox-label input[type="checkbox"]:checked {
    background: var(--accent);
}

.checkbox-label input[type="checkbox"]:checked::after {
    left: 19px;
    background: var(--text-on-accent);
}

/* ─── Ghost Buttons ─── */
.ghost-btn {
    padding: 0.4rem 0.75rem;
    border-radius: var(--radius);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: var(--font-base);
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s var(--ease-out), color 0.2s var(--ease-out);
}

.ghost-btn:hover {
    background: var(--bg-hover);
    color: var(--text);
}

.ghost-btn:disabled,
.ghost-btn[disabled] {
    opacity: 0.4;
    cursor: default;
    pointer-events: none;
}

/* ─── Overlay / Dialog ─── */
.sim-overlay {
    position: fixed;
    inset: 0;
    z-index: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    animation: fadeIn 0.2s ease-out;
}

.sim-overlay[hidden],
.sim-overlay.hidden {
    display: none !important;
}

.sim-overlay-panel {
    max-width: 600px;
    width: 90vw;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    border-radius: var(--radius);
    overflow: hidden;
}

.sim-overlay-body {
    padding: 1rem 1.2rem;
    overflow-y: auto;
    font-size: var(--font-lg);
    line-height: 1.6;
    -webkit-overflow-scrolling: touch;
}

.sim-overlay-body h3 {
    margin: 1em 0 0.3em;
    font-size: var(--font-lg);
}

.sim-overlay-body p { margin: 0.4em 0; }
.sim-overlay-body ul, .sim-overlay-body ol { margin: 0.4em 0; padding-left: 1.2em; }

.sim-overlay-body .katex-display {
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
}

@media (max-width: 600px) {
    .sim-overlay-panel {
        width: 100vw;
        max-width: 100vw;
        max-height: 100vh;
        height: 100vh;
        border-radius: 0;
    }
    .sim-overlay { align-items: stretch; }
    .sim-overlay-body { font-size: var(--font-base); padding: 0.75rem 1rem; }
}

/* ─── Theme Toggle Icons ─── */
.icon-sun, .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: block; }

/* ─── Control Group Label ─── */
label.control-label {
    font-size: var(--font-base);
    color: var(--text);
    font-weight: 400;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

/* ─── Toggle Switches ─── */
.tog-wrap { position: relative; }
.tog-wrap input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

.tog {
    display: inline-flex;
    align-items: center;
    width: 42px;
    height: 22px;
    background: var(--tog-bg);
    border-radius: var(--radius);
    cursor: pointer;
    position: relative;
    border: none;
    box-shadow: none;
    transition: all 0.28s var(--ease-in-out);
    overflow: hidden;
    --tog-color: var(--accent);
    --tog-shift: 20px;
}

.tog-thumb {
    position: absolute;
    left: 4px;
    top: 50%;
    transform: translateY(-50%);
    width: 14px;
    height: 14px;
    border-radius: var(--radius);
    background: var(--text-muted);
    transition: all 0.35s var(--ease-out);
    z-index: 2;
}

.tog-icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    transition: opacity 0.28s var(--ease-in-out);
    z-index: 1;
    line-height: 0;
    color: var(--text-on-accent);
}

.tog-icon-on { right: 5px; opacity: 0.25; }
.tog-icon-off { left: 5px; opacity: 0.6; }

.tog-wrap input:checked + .tog {
    background: linear-gradient(135deg, var(--tog-color), color-mix(in srgb, var(--tog-color), black 25%));
}
.tog-wrap input:checked + .tog .tog-thumb {
    transform: translateX(var(--tog-shift)) translateY(-50%);
    background: var(--bg-elevated);
    box-shadow: 0 0 6px color-mix(in srgb, var(--tog-color) 50%, transparent);
}
.tog-wrap input:checked + .tog .tog-icon-on { opacity: 1; }
.tog-wrap input:checked + .tog .tog-icon-off { opacity: 0.25; }

.tog-wrap input:focus-visible + .tog {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Dark-mode toggle overrides */
[data-theme="dark"] .tog-wrap input:checked + .tog {
    background: linear-gradient(135deg, color-mix(in srgb, var(--tog-color), black 82%), color-mix(in srgb, var(--tog-color), black 72%));
}
[data-theme="dark"] .tog-wrap input:checked + .tog .tog-thumb {
    background: var(--tog-color);
    box-shadow: 0 0 8px color-mix(in srgb, var(--tog-color) 50%, transparent);
}

/* Larger touch targets on coarse pointers */
@media (pointer: coarse) {
    .tog { --tog-shift: 22px; width: 48px; height: 26px; border-radius: var(--radius); }
    .tog-thumb { width: 18px; height: 18px; left: 4px; }
}

/* ─── Touch Device Overrides ─── */
@media (pointer: coarse) {
  .ctrl-row { padding: 6px 0; }
  .tool-btn { width: 44px; height: 44px; }
  .info-trigger { min-width: 32px; min-height: 32px; padding: 8px; }
  .tab-btn { min-height: 44px; }
  .mode-btn { min-height: 44px; }

  .sim-toolbar-actions {
    overflow-x: auto;
    scrollbar-width: none;
  }
  .sim-toolbar-actions::-webkit-scrollbar { display: none; }
}

/* ─── Simulation Body Base ─── */
/* Simulation apps (not the portfolio) use this to lock viewport */
.sim-body {
    overflow: hidden;
    font-size: 14px;
    line-height: 1.5;
    height: 100vh;
    height: 100dvh;
    width: 100vw;
    user-select: none;
}

html:has(> .sim-body) { overflow: hidden; }

/* ─── Canvas Container ─── */
.canvas-container {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--bg-canvas);
    position: relative;
    touch-action: none;
    transition: background-color 0.5s var(--ease-out);
}

/* ─── Substrate Pill Buttons ─── */
.pill-group {
    display: flex;
    align-items: center;
}

.pill-btn {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.7rem;
    border: none;
    background: transparent;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: clamp(0.72rem, 1vw, 0.82rem);
    cursor: pointer;
    transition: color 0.2s, background 0.2s;
    white-space: nowrap;
    outline: none;
    -webkit-appearance: none;
}

.pill-btn-left  { border-radius: var(--radius) 0 0 var(--radius); }
.pill-btn-right { border-radius: 0 var(--radius) var(--radius) 0; }
.pill-btn-solo  { border-radius: var(--radius); }

.pill-btn:hover:not(:disabled) {
    background: color-mix(in srgb, currentColor 10%, transparent);
}

.pill-btn:active:not(:disabled) {
    transform: scale(0.96);
}

.pill-btn:disabled {
    opacity: 0.35;
    cursor: default;
}

/* ─── Divider ─── */
.divider {
    width: 1px;
    height: 20px;
    background: var(--bg-hover);
    flex-shrink: 0;
    opacity: 0.6;
}

/* ─── Sparkline ─── */
.sparkline {
    display: block;
    width: 100%;
    height: var(--sparkline-h, 36px);
    margin-top: 4px;
    border-radius: var(--radius);
    background: transparent;
}

/* ─── Text Input ─── */
.sim-input {
    width: 100%;
    padding: 0.4rem 0.65rem;
    border-radius: var(--radius);
    border: none;
    background: var(--bg-hover);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: var(--font-base);
    outline: none;
    transition: background 0.2s var(--ease-out), box-shadow 0.25s var(--ease-out);
}

.sim-input:focus {
    background: var(--bg-elevated);
    box-shadow: var(--shadow-hover);
    outline: 2px solid var(--accent);
    outline-offset: 0;
}

/* ─── Progress Track ─── */
.progress-track {
    width: 100%;
    height: var(--track-h, 4px);
    background: var(--slider-track);
    border-radius: calc(var(--track-h, 4px) / 2);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    border-radius: inherit;
    transition: width 0.4s var(--ease-smooth);
}

/* ─── Icon Tight (thicker stroke for small icons) ─── */
.icon-tight svg {
    stroke-width: 2.5;
}

/* ─── Label Utilities ─── */
.label-caps {
    font-family: var(--font-mono);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-size: var(--font-sm);
    color: var(--text-muted);
}

/* ─── Canvas Cursor ─── */
.cursor-grab { cursor: grab; }
.cursor-grab:active { cursor: grabbing; }

/* ─── Mobile Bottom Sheet ─── */
/* Sim panels become bottom sheets on mobile */
@media (max-width: 900px) {
    .sim-panel {
        top: auto;
        right: 0;
        left: 0;
        bottom: 0;
        width: 100%;
        max-height: 55vh;
        border-radius: var(--radius) var(--radius) 0 0;
        transform: translateY(100%);
    }

    .sim-panel.open,
    .app-ready .sim-panel.open {
        transform: translateY(0);
    }
}


/* ─── Additional Keyframes ─── */
@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.95); }
    to   { opacity: 1; transform: scale(1); }
}

@keyframes glowPulse {
    0%, 100% { box-shadow: var(--shadow-glow); opacity: 0.7; }
    50%      { box-shadow: var(--shadow-glow); opacity: 1; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-6px); }
}

@keyframes shimmerSlide {
    0%   { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes breathe {
    0%, 100% { opacity: 0.4; }
    50%      { opacity: 0.8; }
}

/* ─── Reduced Motion ─── */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}