/* CRNA Study Suite — Shared Theme */

/* ===== Theme: Dark ===== */
:root {
    --bg:           #111827;
    --bg-elevated:  #1f2937;
    --bg-subtle:    #1a2330;
    --border:       #374151;
    --border-strong:#4b5563;
    --text:         #e5e7eb;
    --text-muted:   #9ca3af;
    --text-soft:    #6b7280;
    --accent:       #2dd4bf;
    --accent-soft:  rgba(45, 212, 191, 0.10);
    --accent-strong:#5eead4;
    --var-color:    #60a5fa;
    --var-bg:       rgba(96, 165, 250, 0.14);
    --warning:      #fbbf24;
    --warning-bg:   rgba(251, 191, 36, 0.10);
    --critical:     #f87171;
    --critical-bg:  rgba(248, 113, 113, 0.10);
    --shadow:       0 4px 12px rgba(0,0,0,0.3);
}

/* ===== Theme: Light ===== */
[data-theme="light"] {
    --bg:           #ffffff;
    --bg-elevated:  #f9fafb;
    --bg-subtle:    #f3f4f6;
    --border:       #e5e7eb;
    --border-strong:#d1d5db;
    --text:         #1f2937;
    --text-muted:   #4b5563;
    --text-soft:    #6b7280;
    --accent:       #1e3a8a;
    --accent-soft:  #e0f2fe;
    --accent-strong:#1d4ed8;
    --var-color:    #0369a1;
    --var-bg:       #e0f2fe;
    --warning:      #b45309;
    --warning-bg:   #fef3c7;
    --critical:     #b91c1c;
    --critical-bg:  #fee2e2;
    --shadow:       0 2px 8px rgba(0,0,0,0.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    line-height: 1.5;
}

.container { max-width: 900px; margin: 0 auto; padding: 24px 20px; }

/* Header */
.header {
    position: relative;
    text-align: center;
    padding: 20px 0 24px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 28px;
}
.header h1 { font-size: 26px; font-weight: 700; color: var(--accent); letter-spacing: -0.01em; }
.header .subtitle { font-size: 14px; color: var(--text-muted); margin-top: 4px; }

/* Theme toggle */
.theme-toggle {
    position: absolute; top: 0; right: 0;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    color: var(--text);
    width: 38px; height: 38px;
    border-radius: 8px;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    font-size: 18px;
    transition: all 0.2s;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle .sun { display: none; }
.theme-toggle .moon { display: inline; }
[data-theme="light"] .theme-toggle .sun { display: inline; }
[data-theme="light"] .theme-toggle .moon { display: none; }

.nav-links { margin-top: 16px; display: flex; justify-content: center; gap: 8px; flex-wrap: wrap; }
.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: all 0.15s;
}
.nav-links a:hover { color: var(--text); border-color: var(--border-strong); }
.nav-links a.active {
    color: var(--accent); border-color: var(--accent); background: var(--accent-soft);
}

/* Form Sections */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
@media (max-width: 768px) { .form-grid { grid-template-columns: 1fr; } }

.form-section {
    background-color: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 22px;
    box-shadow: var(--shadow);
}

.section-title {
    font-size: 13px; font-weight: 600;
    color: var(--accent);
    letter-spacing: 0.04em; text-transform: uppercase;
    border-bottom: 1px solid var(--border);
    padding-bottom: 10px; margin-bottom: 16px;
}

/* Form Fields */
.form-group { margin-bottom: 14px; }
.form-group label {
    display: block;
    font-size: 12px; font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 6px;
}

.form-group input,
.form-group select {
    width: 100%;
    background-color: var(--bg);
    border: 1px solid var(--border-strong);
    color: var(--text);
    padding: 10px 12px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 14px;
    border-radius: 6px;
    transition: all 0.15s;
}
.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-group select {
    cursor: pointer;
    appearance: none; -webkit-appearance: none; -moz-appearance: none;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='1,1 6,6 11,1'/></svg>");
    background-repeat: no-repeat;
    background-position: right 14px center;
    background-size: 12px;
    padding-right: 36px;
}
[data-theme="light"] .form-group select {
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='1,1 6,6 11,1'/></svg>");
}
.form-group select option { background-color: var(--bg); color: var(--text); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

/* Height Toggle & Epi Toggle (shared pattern) */
.height-toggle, .epi-toggle { display: flex; gap: 8px; margin-bottom: 8px; }
.height-toggle button, .epi-toggle button {
    flex: 1;
    background-color: var(--bg);
    border: 1px solid var(--border-strong);
    color: var(--text-muted);
    padding: 10px;
    font-family: 'Inter', sans-serif;
    font-size: 12px; font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.height-toggle button.active, .epi-toggle button.active {
    border-color: var(--accent);
    color: var(--accent);
    background-color: var(--accent-soft);
}
.height-toggle button:hover, .epi-toggle button:hover { border-color: var(--accent); }

.height-imperial { display: none; }
.height-imperial.active { display: grid; }
.height-metric.active { display: block; }
.height-metric { display: none; }

/* Calculate Button */
.calculate-btn {
    width: 100%;
    background-color: var(--accent);
    border: 1px solid var(--accent);
    color: var(--bg);
    padding: 14px 20px;
    font-family: 'Inter', sans-serif;
    font-size: 15px; font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    letter-spacing: 0.02em;
    transition: all 0.15s;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
}
.calculate-btn:hover { background-color: var(--accent-strong); border-color: var(--accent-strong); }
[data-theme="light"] .calculate-btn { color: #ffffff; }

/* Results Section */
.results-section {
    display: none;
    background-color: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 22px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}
.results-section.visible { display: block; }

.results-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 20px; }
@media (max-width: 768px) { .results-grid { grid-template-columns: repeat(2, 1fr); } }

.result-card {
    background-color: var(--bg);
    border: 1px solid var(--border);
    padding: 16px;
    text-align: center;
    border-radius: 8px;
}
.result-label {
    font-size: 11px; font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 8px;
}
.result-value {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 24px; font-weight: 700;
    color: var(--accent);
}
.result-unit { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

.result-card.warning { border-color: var(--warning); }
.result-card.warning .result-value { color: var(--warning); }
.result-card.critical { border-color: var(--critical); }
.result-card.critical .result-value { color: var(--critical); }

/* Tables (fluid-table, info-table) */
.fluid-table, .info-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    font-size: 13px;
}
.fluid-table th, .fluid-table td,
.info-table th, .info-table td {
    border-bottom: 1px solid var(--border);
    padding: 10px 12px;
    text-align: center;
}
.fluid-table th, .info-table th {
    background-color: var(--bg-subtle);
    color: var(--text);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-size: 11px; font-weight: 600;
}
.fluid-table td { background-color: var(--bg); font-family: 'IBM Plex Mono', monospace; }
.info-table td { background-color: var(--bg); }
.fluid-table tr:last-child td {
    background-color: var(--accent-soft);
    font-weight: 700;
    color: var(--accent);
}
.fluid-table .row-label, .info-table .row-label {
    text-align: left;
    color: var(--text-muted);
    font-size: 12px; font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-family: 'Inter', sans-serif;
}
.info-table .row-label { color: var(--text); }

/* Calculation Breakdown */
.calc-breakdown {
    margin-top: 16px;
    padding: 16px;
    background-color: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
}
.calc-item {
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}
.calc-item:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: none; }
.calc-title { font-size: 14px; font-weight: 600; color: var(--accent); margin-bottom: 6px; }
.calc-formula { font-size: 13px; color: var(--text-muted); margin-bottom: 6px; font-style: italic; }
.calc-work { font-family: 'IBM Plex Mono', monospace; font-size: 13px; color: var(--text); line-height: 1.7; }
.calc-result { font-family: 'IBM Plex Mono', monospace; font-size: 14px; color: var(--text); font-weight: 600; margin-top: 6px; }
.calc-citation { font-size: 12px; color: var(--text-soft); margin-top: 6px; font-style: italic; }

.calc-var {
    font-family: 'IBM Plex Mono', monospace;
    color: var(--var-color);
    background-color: var(--var-bg);
    padding: 1px 6px;
    border-radius: 3px;
    font-weight: 600;
}

/* Clinical Notes */
.clinical-note {
    background-color: var(--warning-bg);
    border: 1px solid var(--warning);
    border-left-width: 4px;
    color: var(--text);
    padding: 12px 16px;
    font-size: 13px;
    margin-top: 14px;
    border-radius: 6px;
    display: none;
    line-height: 1.6;
}
.clinical-note strong { color: var(--warning); }
.clinical-note.visible { display: block; }
.clinical-note.critical { background-color: var(--critical-bg); border-color: var(--critical); }
.clinical-note.critical strong { color: var(--critical); }

/* LAST box (emergency protocol boxes) */
.last-box {
    margin-top: 20px; padding: 16px 18px;
    background: var(--critical-bg);
    border: 1px solid var(--critical);
    border-left-width: 4px;
    color: var(--text);
    font-size: 13px; line-height: 1.7;
    border-radius: 6px;
}
.last-box > strong { display: block; margin-bottom: 10px; font-size: 14px; color: var(--critical); font-weight: 700; }

/* Action Buttons */
.action-buttons { display: flex; gap: 10px; margin-top: 20px; }
.action-btn {
    flex: 1;
    background-color: var(--bg);
    border: 1px solid var(--border-strong);
    color: var(--text);
    padding: 10px 15px;
    font-family: 'Inter', sans-serif;
    font-size: 13px; font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    letter-spacing: 0.02em;
    transition: all 0.15s;
}
.action-btn:hover { border-color: var(--accent); color: var(--accent); }

/* References */
.references {
    margin-top: 32px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
}
.references > strong { color: var(--text); display: block; font-size: 14px; margin-bottom: 12px; }
.references p {
    margin-bottom: 12px;
    padding-left: 24px;
    text-indent: -24px;
}
.references p:last-child { margin-bottom: 0; }
.references p strong { color: var(--text); }

/* Landing / Index page tiles */
.tile-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; margin-top: 20px; }
.tile {
    display: block;
    background-color: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px;
    text-decoration: none;
    color: var(--text);
    transition: all 0.15s;
    box-shadow: var(--shadow);
}
.tile:hover { border-color: var(--accent); transform: translateY(-1px); }
.tile .tile-title { font-size: 16px; font-weight: 600; color: var(--accent); margin-bottom: 6px; }
.tile .tile-desc { font-size: 13px; color: var(--text-muted); line-height: 1.5; }
.tile .tile-cat {
    font-size: 11px; color: var(--text-soft); text-transform: uppercase;
    letter-spacing: 0.06em; font-weight: 600; margin-bottom: 8px;
}

/* Print Styles */
@media print {
    body { background: white; color: black; }
    .container { max-width: 100%; }
    .theme-toggle, .nav-links, .form-grid, .calculate-btn, .action-buttons,
    .height-toggle, .epi-toggle { display: none !important; }
    .header { border-bottom: 2px solid black; }
    .header h1 { color: black; }
    .results-section { display: block !important; border: 1px solid black; box-shadow: none; background: white; }
    .result-card { border: 1px solid #333; background: white; }
    .result-value { color: black; }
    .calc-breakdown, .calc-item { border-color: #999; background: white; }
    .calc-title, .section-title { color: black; border-color: black; }
    .calc-formula, .calc-citation { color: #555; }
    .calc-work, .calc-result { color: black; }
    .calc-var { color: black; background: #eee; }
    .fluid-table th, .fluid-table td,
    .info-table th, .info-table td { border: 1px solid black; color: black; background: white; }
    .clinical-note, .last-box { border: 1px solid black; color: black; background: white; }
    .references { color: #333; }
    .tile { border: 1px solid #999; background: white; page-break-inside: avoid; }
}