:root {
    --primary-color: #39d98a;
    --secondary-color: #36a3ff;
    --background-color: #07111c;
    --background-soft: #0d1a27;
    --card-color: rgba(15, 29, 42, 0.94);
    --card-light: #132333;
    --text-color: #edf7ff;
    --muted-color: #91a7b8;
    --border-color: rgba(143, 181, 205, 0.17);
    --danger-color: #ff6577;
    --shadow: 0 18px 50px rgba(0,0,0,.25);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    min-height: 100vh;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text-color);
    background:
        radial-gradient(circle at 20% 10%, rgba(54,163,255,.12), transparent 30%),
        radial-gradient(circle at 90% 20%, rgba(57,217,138,.09), transparent 28%),
        var(--background-color);
}
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }

.topbar {
    min-height: 92px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
    padding: 22px 28px;
    border-bottom: 1px solid var(--border-color);
    background: rgba(7,17,28,.86);
    backdrop-filter: blur(16px);
    position: sticky;
    top: 0;
    z-index: 20;
}
.topbar h1, .panel-heading h2, .charts-header h2, .academic-box h2 { margin: 4px 0; }
.topbar h1 { font-size: clamp(1.35rem, 2vw, 2rem); }
.topbar p { margin: 5px 0 0; color: var(--muted-color); }
.eyebrow {
    color: var(--primary-color);
    font-size: .68rem;
    font-weight: 800;
    letter-spacing: .14em;
}
.top-actions, .simulation-controls { display: flex; gap: 10px; align-items: center; }

.button {
    border: 1px solid var(--border-color);
    color: var(--text-color);
    background: #122334;
    border-radius: 10px;
    padding: 10px 14px;
    font-weight: 750;
}
.button:hover { border-color: rgba(57,217,138,.55); transform: translateY(-1px); }
.button.primary { background: var(--primary-color); color: #042116; border-color: transparent; }
.button:disabled { opacity: .45; cursor: not-allowed; transform: none; }

.dashboard {
    display: grid;
    grid-template-columns: 315px minmax(0, 1fr);
    gap: 18px;
    padding: 18px;
    max-width: 1800px;
    margin: auto;
}
.panel {
    background: var(--card-color);
    border: 1px solid var(--border-color);
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.settings-panel {
    align-self: start;
    position: sticky;
    top: 110px;
    max-height: calc(100vh - 128px);
    overflow: auto;
    padding: 18px;
}
.panel-heading, .charts-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}
.panel-heading h2, .charts-header h2 { font-size: 1rem; }
.icon-button {
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-color);
    border-radius: 9px;
    padding: 7px 9px;
}
.control-section {
    border-top: 1px solid var(--border-color);
    margin-top: 16px;
    padding-top: 14px;
}
.control-section h3 {
    font-size: .76rem;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--muted-color);
    margin: 0 0 12px;
}
.control-section label {
    display: block;
    font-size: .8rem;
    color: #d7e7f2;
    margin: 12px 0;
}
output { float: right; color: var(--primary-color); font-weight: 800; }
input[type="range"] { width: 100%; accent-color: var(--primary-color); margin-top: 8px; }
select, textarea {
    width: 100%;
    margin-top: 7px;
    color: var(--text-color);
    background: #0a1724;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 9px;
}
textarea { resize: vertical; min-height: 72px; }
small { color: var(--muted-color); line-height: 1.4; }
.hidden { display: none !important; }

.main-content { min-width: 0; }
.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(320px, .65fr);
    gap: 18px;
}
.turbine-panel, .math-panel, .charts-panel, .table-panel { padding: 18px; }
.status { display: flex; align-items: center; gap: 7px; color: var(--muted-color); font-size: .76rem; }
#statusDot {
    width: 9px; height: 9px; border-radius: 50%;
    background: var(--primary-color);
    box-shadow: 0 0 14px var(--primary-color);
}
.turbine-stage {
    position: relative;
    margin-top: 15px;
    overflow: hidden;
    border-radius: 14px;
    min-height: 430px;
}
#turbineSvg { width: 100%; height: 430px; display: block; }
.svg-sky { fill: url(#skyGradient); }
.hill { fill: #102c3b; opacity: .8; }
.hill.front { fill: #0b2531; }
.tower { fill: url(#towerGradient); stroke: rgba(255,255,255,.3); stroke-width: 1; }
.base { fill: #071018; opacity: .9; }
.nacelle { fill: #e5f0f4; }
.hub { fill: #c9dce5; stroke: #fff; stroke-width: 2; }
#blades { transform-origin: 300px 158px; transform-box: view-box; }
.blade { fill: #f4fbff; stroke: #aac2cf; stroke-width: 1.3; }
.wind-lines {
    position: absolute; inset: 0; pointer-events: none; opacity: .25;
    background: repeating-linear-gradient(-10deg, transparent 0 38px, rgba(255,255,255,.1) 39px 40px);
}
.turbine-caption {
    position: absolute; left: 14px; right: 14px; bottom: 12px;
    display: flex; justify-content: space-between; gap: 10px;
    padding: 9px 11px; border-radius: 10px;
    background: rgba(4,12,20,.66); backdrop-filter: blur(8px);
    color: var(--muted-color); font-size: .72rem;
}
.turbine-caption strong { color: var(--text-color); }

.math-content {
    margin-top: 14px; padding: 15px;
    background: #091723; border: 1px solid var(--border-color);
    border-radius: 12px; line-height: 1.7;
}
.formula { font-family: Georgia, serif; font-size: 1.02rem; color: #fff; margin: 7px 0; }
.formula span { color: var(--primary-color); }
.explanation { color: var(--muted-color); font-size: .78rem; line-height: 1.55; }
.calculation-details { margin-top: 12px; border-top: 1px solid var(--border-color); padding-top: 12px; }
.calculation-details summary { cursor: pointer; color: var(--primary-color); font-weight: 750; font-size: .82rem; }
.calculation-details .explanation { margin-top: 10px; }

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin: 18px 0;
}
.metric-card {
    padding: 16px;
    background: var(--card-color);
    border: 1px solid var(--border-color);
    border-radius: 14px;
}
.metric-card span { display: block; color: var(--muted-color); font-size: .75rem; }
.metric-card strong { display: block; margin-top: 7px; font-size: clamp(1.05rem, 2vw, 1.45rem); }

.charts-header { margin-bottom: 15px; }
#playbackText { color: var(--primary-color); font-weight: 800; }
.charts-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}
.chart-card {
    min-width: 0; padding: 13px; background: #0a1724;
    border: 1px solid var(--border-color); border-radius: 12px;
}
.chart-card h3 { margin: 0 0 10px; font-size: .77rem; color: var(--muted-color); }
.chart-card canvas { width: 100% !important; height: 220px !important; }
.compass-card { display: flex; flex-direction: column; }
#windRose { width: 100%; max-height: 220px; }
.rose-ring, .rose-axis { fill: none; stroke: #557180; stroke-opacity: .45; }
.rose-arrow { fill: var(--primary-color); transform-origin: 130px 130px; }
#windRose text { fill: var(--muted-color); font-size: 12px; font-weight: 700; }

.table-panel { margin-top: 18px; }
.table-wrap { overflow-x: auto; margin-top: 14px; }
table { width: 100%; border-collapse: collapse; min-width: 650px; }
th, td { text-align: right; padding: 10px; border-bottom: 1px solid var(--border-color); font-size: .78rem; }
th { color: var(--muted-color); font-weight: 700; }
td:first-child, th:first-child { text-align: left; }
tbody tr:hover { background: rgba(255,255,255,.025); }

.academic-box {
    margin-top: 18px; padding: 20px;
    display: flex; justify-content: space-between; align-items: center; gap: 25px;
    border: 1px solid rgba(57,217,138,.25);
    border-radius: 18px;
    background: linear-gradient(120deg, rgba(57,217,138,.08), rgba(54,163,255,.07));
}
.academic-box p { margin-bottom: 0; color: var(--muted-color); max-width: 650px; line-height: 1.5; }
.formula-large { font-family: Georgia, serif; font-size: 1.15rem; white-space: nowrap; color: var(--primary-color); }
footer { text-align: center; padding: 28px; color: var(--muted-color); font-size: .72rem; }

body.settings-collapsed .settings-panel { width: 65px; overflow: hidden; }
body.settings-collapsed .settings-panel .control-section,
body.settings-collapsed .settings-panel .panel-heading h2,
body.settings-collapsed .settings-panel .eyebrow { display: none; }

@media (max-width: 1150px) {
    .dashboard { grid-template-columns: 260px minmax(0, 1fr); }
    .hero-grid { grid-template-columns: 1fr; }
}
@media (max-width: 850px) {
    .topbar { position: static; align-items: flex-start; flex-direction: column; }
    .top-actions { width: 100%; }
    .top-actions .button { flex: 1; }
    .dashboard { display: block; padding: 10px; }
    .settings-panel { position: static; max-height: none; margin-bottom: 12px; }
    .metrics-grid { grid-template-columns: repeat(2, 1fr); }
    .charts-grid { grid-template-columns: 1fr; }
    .academic-box { flex-direction: column; align-items: flex-start; }
    .formula-large { white-space: normal; }
}
@media (max-width: 500px) {
    .metrics-grid { grid-template-columns: 1fr; }
    .turbine-caption { flex-direction: column; gap: 3px; }
    #turbineSvg { height: 350px; }
    .turbine-stage { min-height: 350px; }
}

@keyframes spinBlade {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}