/* ================================================================
   SCIAN EVL SpherSIM - Dark theme with blue accent
   ================================================================ */

:root {
    --bg-dark:       #0d1117;
    --bg-panel:      #161b22;
    --bg-input:      #0d1117;
    --border:        #30363d;
    --text-primary:  #e6edf3;
    --text-secondary:#8b949e;
    --accent:        #388bfd;
    --accent-hover:  #58a6ff;
    --accent-dim:    #1f3a5f;
    --success:       #3fb950;
    --warning:       #d29922;
    --danger:        #f85149;
    --cell-stroke:   #58a6ff;
    --font-mono:     'Consolas', 'Courier New', monospace;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
                 Oxygen, Ubuntu, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ---- Header ---- */
#app-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 8px 20px;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

#app-header h1 {
    font-size: 16px;
    font-weight: 600;
    color: var(--accent);
}

#app-header .subtitle {
    font-size: 12px;
    color: var(--text-secondary);
}

/* ---- Main layout ---- */
#app-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ---- Controls panel ---- */
#controls-panel {
    width: 280px;
    min-width: 240px;
    background: var(--bg-panel);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex-shrink: 0;
}

.panel-section {
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 12px;
}

.panel-section h2 {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

/* Buttons */
.btn-row {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

button {
    font-family: inherit;
    font-size: 12px;
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--accent-dim);
    color: var(--text-primary);
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
}

button:hover:not(:disabled) {
    background: var(--accent);
    border-color: var(--accent);
}

button:disabled {
    opacity: 0.4;
    cursor: default;
}

/* Labels and inputs */
.panel-section label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 6px;
    gap: 8px;
}

.panel-section input[type="number"] {
    width: 90px;
    padding: 4px 6px;
    font-family: var(--font-mono);
    font-size: 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    text-align: right;
}

.panel-section input[type="number"]:focus {
    outline: none;
    border-color: var(--accent);
}

.panel-section input[type="checkbox"] {
    accent-color: var(--accent);
}

/* Status */
#status-info p {
    font-size: 12px;
    font-family: var(--font-mono);
    color: var(--text-secondary);
    margin-bottom: 4px;
}

#status-info span {
    color: var(--text-primary);
}

/* ---- Viewport ---- */
#viewport {
    flex: 1;
    position: relative;
    overflow: hidden;
}

#three-canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* ---- Help button (header) ---- */
.help-btn {
    margin-left: auto;
    width: 28px;
    height: 28px;
    padding: 0;
    font-size: 14px;
    font-weight: 700;
    line-height: 28px;
    text-align: center;
    border-radius: 50%;
    background: var(--accent-dim);
    border: 1px solid var(--accent);
    color: var(--accent-hover);
    cursor: pointer;
    flex-shrink: 0;
}

.help-btn:hover {
    background: var(--accent);
    color: #fff;
}

/* ---- Help modal ---- */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.65);
    align-items: center;
    justify-content: center;
}

.modal.modal-visible {
    display: flex;
}

.modal-content {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 28px 32px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    color: var(--text-primary);
}

.modal-content h2 {
    font-size: 18px;
    margin-bottom: 16px;
    color: var(--accent-hover);
}

.modal-content h3 {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--accent);
    margin-top: 18px;
    margin-bottom: 8px;
}

.modal-content p,
.modal-content li {
    font-size: 13px;
    line-height: 1.5;
    color: var(--text-secondary);
}

.modal-content ol,
.modal-content ul {
    padding-left: 20px;
    margin-bottom: 8px;
}

.modal-content li {
    margin-bottom: 4px;
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 22px;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

/* ---- Section header with inline help icon ---- */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.section-header h2 {
    margin-bottom: 0;
}

.help-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    font-size: 11px;
    font-weight: 700;
    border-radius: 50%;
    background: var(--accent-dim);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    flex-shrink: 0;
    transition: background 0.15s, color 0.15s;
}

.help-icon:hover,
.help-icon.help-icon-active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* ---- Expandable help text ---- */
.help-text {
    font-size: 11px;
    line-height: 1.5;
    color: var(--text-secondary);
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 8px 10px;
    margin-bottom: 10px;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-panel);
}
::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}