:root {
    color-scheme: dark;
    --bg: #050b13;
    --bg-elevated: #07111f;
    --panel: rgba(12, 25, 43, 0.86);
    --panel-solid: #0d1a2b;
    --panel-soft: rgba(18, 35, 56, 0.72);
    --line: rgba(148, 177, 213, 0.15);
    --line-strong: rgba(148, 177, 213, 0.26);
    --text: #f4f8ff;
    --muted: #8fa5bf;
    --subtle: #60758e;
    --accent: #ff8a1e;
    --accent-2: #ffb545;
    --blue: #4ea4ff;
    --cyan: #5de2d0;
    --danger: #ff6476;
    --success: #63e6a6;
    --shadow: 0 24px 80px rgba(0, 0, 0, 0.42);
    --radius: 20px;
    --radius-sm: 13px;
    --topbar-height: 76px;
}

:root[data-theme="light"] {
    color-scheme: light;
    --bg: #edf3f9;
    --bg-elevated: #ffffff;
    --panel: rgba(255, 255, 255, 0.9);
    --panel-solid: #ffffff;
    --panel-soft: rgba(240, 246, 252, 0.86);
    --line: rgba(30, 58, 88, 0.12);
    --line-strong: rgba(30, 58, 88, 0.22);
    --text: #102238;
    --muted: #566d86;
    --subtle: #7b8fa5;
    --shadow: 0 24px 70px rgba(53, 76, 102, 0.16);
}

* {
    box-sizing: border-box;
}

html,
body {
    min-height: 100%;
    margin: 0;
}

body {
    overflow-x: hidden;
    background:
        radial-gradient(circle at 73% 12%, rgba(78, 164, 255, 0.13), transparent 32%),
        radial-gradient(circle at 12% 88%, rgba(255, 138, 30, 0.09), transparent 28%),
        var(--bg);
    color: var(--text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.45;
}

button,
input,
select {
    font: inherit;
}

button,
select,
input[type="radio"] {
    cursor: pointer;
}

button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid rgba(78, 164, 255, 0.85);
    outline-offset: 2px;
}

.app-shell {
    min-height: 100vh;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    min-height: var(--topbar-height);
    padding: 0 26px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    border-bottom: 1px solid var(--line);
    background: color-mix(in srgb, var(--bg-elevated) 82%, transparent);
    backdrop-filter: blur(22px);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 13px;
    color: var(--text);
    text-decoration: none;
}

.brand strong,
.brand small {
    display: block;
}

.brand strong {
    font-size: 18px;
    letter-spacing: -0.02em;
}

.brand small {
    margin-top: 1px;
    color: var(--muted);
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.brand-mark {
    position: relative;
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border: 1px solid rgba(255, 138, 30, 0.34);
    border-radius: 13px;
    background: linear-gradient(145deg, rgba(255, 138, 30, 0.18), rgba(255, 138, 30, 0.03));
    box-shadow: inset 0 1px 0 rgba(255,255,255,.08), 0 8px 24px rgba(255, 138, 30, .1);
}

.gear-ring {
    width: 23px;
    height: 23px;
    border: 4px dotted var(--accent);
    border-radius: 50%;
    animation: logoSpin 12s linear infinite;
}

.gear-core {
    position: absolute;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent-2);
    box-shadow: 0 0 12px rgba(255, 181, 69, .8);
}

@keyframes logoSpin { to { transform: rotate(360deg); } }

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.engine-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 36px;
    padding: 0 13px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--muted);
    background: var(--panel-soft);
    font-size: 12px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 0 4px rgba(99, 230, 166, 0.11), 0 0 14px rgba(99, 230, 166, 0.5);
}

.engine-pill.offline .status-dot {
    background: var(--danger);
    box-shadow: 0 0 0 4px rgba(255, 100, 118, .11);
}

.icon-button,
.tool-button,
.text-button {
    border: 0;
    color: var(--text);
    background: transparent;
}

.icon-button {
    width: 38px;
    height: 38px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--panel-soft);
}

.workspace {
    min-height: calc(100vh - var(--topbar-height) - 45px);
    padding: 20px;
    display: grid;
    grid-template-columns: minmax(330px, 390px) minmax(0, 1fr);
    gap: 20px;
}

.control-panel,
.viewer-card,
.result-card,
.engineering-strip {
    border: 1px solid var(--line);
    background: var(--panel);
    box-shadow: var(--shadow);
    backdrop-filter: blur(18px);
}

.control-panel {
    align-self: start;
    max-height: calc(100vh - var(--topbar-height) - 40px);
    overflow-y: auto;
    padding: 21px;
    border-radius: var(--radius);
    scrollbar-width: thin;
    scrollbar-color: var(--line-strong) transparent;
}

.panel-heading,
.viewer-header,
.inline-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.panel-heading {
    padding: 2px 2px 18px;
    border-bottom: 1px solid var(--line);
}

.eyebrow {
    display: block;
    margin-bottom: 5px;
    color: var(--accent-2);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: .15em;
    text-transform: uppercase;
}

h1,
h2,
p {
    margin-top: 0;
}

h1 {
    margin-bottom: 0;
    font-size: clamp(21px, 2vw, 26px);
    letter-spacing: -.035em;
}

h2 {
    margin-bottom: 0;
    font-size: 16px;
    letter-spacing: -.02em;
}

.text-button {
    padding: 8px 0 8px 12px;
    color: var(--blue);
    font-size: 12px;
    font-weight: 700;
}

.form-section {
    padding: 21px 2px;
    border-bottom: 1px solid var(--line);
}

.compact-section {
    border-bottom: 0;
    padding-bottom: 8px;
}

.section-title {
    display: flex;
    align-items: flex-start;
    gap: 11px;
    margin-bottom: 16px;
}

.section-title p,
.field-hint {
    margin: 3px 0 0;
    color: var(--muted);
    font-size: 12px;
}

.step-number {
    width: 27px;
    height: 27px;
    flex: 0 0 auto;
    display: grid;
    place-items: center;
    border: 1px solid rgba(78, 164, 255, .26);
    border-radius: 9px;
    color: var(--blue);
    background: rgba(78, 164, 255, .08);
    font-size: 10px;
    font-weight: 800;
}

.field {
    display: block;
    margin-top: 13px;
}

.field-label {
    display: block;
    margin-bottom: 7px;
    color: var(--muted);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .03em;
}

.field-label em {
    color: var(--subtle);
    font-style: normal;
    font-weight: 500;
}

input[type="number"],
select {
    width: 100%;
    min-height: 43px;
    border: 1px solid var(--line-strong);
    border-radius: 11px;
    padding: 0 12px;
    color: var(--text);
    background: color-mix(in srgb, var(--panel-solid) 82%, transparent);
    transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}

select {
    padding-right: 34px;
}

input[type="number"]:hover,
select:hover {
    border-color: rgba(78, 164, 255, .38);
}

input[type="number"]:focus,
select:focus {
    border-color: rgba(78, 164, 255, .75);
    box-shadow: 0 0 0 4px rgba(78, 164, 255, .10);
}

input::-webkit-inner-spin-button {
    opacity: .45;
}

.field-grid {
    display: grid;
    gap: 10px;
}

.two-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.three-columns {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.segmented-control,
.mini-toggle {
    display: grid;
    gap: 4px;
    padding: 4px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: color-mix(in srgb, var(--panel-solid) 78%, transparent);
}

.segmented-control {
    grid-template-columns: repeat(2, 1fr);
}

.segmented-control.three {
    grid-template-columns: repeat(3, 1fr);
    margin-top: 10px;
}

.segmented-control label,
.mini-toggle label {
    position: relative;
}

.segmented-control input,
.mini-toggle input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.segmented-control span,
.mini-toggle span {
    min-height: 33px;
    display: grid;
    place-items: center;
    border-radius: 8px;
    color: var(--muted);
    font-size: 11px;
    font-weight: 700;
    transition: .2s ease;
}

.segmented-control input:checked + span,
.mini-toggle input:checked + span {
    color: #fff;
    background: linear-gradient(135deg, #247bd1, #4ea4ff);
    box-shadow: 0 6px 16px rgba(39, 126, 210, .28);
}

.pitch-readout {
    margin-top: 12px;
    padding: 11px 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    border: 1px dashed rgba(255, 138, 30, .28);
    border-radius: 11px;
    background: rgba(255, 138, 30, .055);
}

.pitch-readout span {
    color: var(--muted);
    font-size: 11px;
}

.pitch-readout strong {
    color: var(--accent-2);
    font-size: 13px;
}

.mini-toggle {
    min-width: 112px;
    grid-template-columns: repeat(2, 1fr);
}

.calculation-status {
    min-height: 39px;
    margin-top: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    border-radius: 10px;
    color: var(--muted);
    background: var(--panel-soft);
    font-size: 11px;
    opacity: 0;
    transform: translateY(4px);
    transition: .2s ease;
}

.calculation-status.visible {
    opacity: 1;
    transform: translateY(0);
}

.spinner,
.large-spinner {
    display: inline-block;
    border-radius: 50%;
    border: 2px solid rgba(78, 164, 255, .18);
    border-top-color: var(--blue);
    animation: spin .8s linear infinite;
}

.spinner {
    width: 14px;
    height: 14px;
}

.large-spinner {
    width: 30px;
    height: 30px;
    margin-bottom: 7px;
}

@keyframes spin { to { transform: rotate(360deg); } }

.visual-workspace {
    min-width: 0;
    display: grid;
    grid-template-rows: minmax(430px, 1fr) auto auto;
    gap: 16px;
}

.viewer-card {
    min-width: 0;
    min-height: 430px;
    display: grid;
    grid-template-rows: auto 1fr;
    overflow: hidden;
    border-radius: var(--radius);
}

.viewer-header {
    min-height: 72px;
    padding: 14px 16px 14px 20px;
    border-bottom: 1px solid var(--line);
}

.viewer-tools {
    display: flex;
    align-items: center;
    gap: 7px;
}

.tool-button {
    min-height: 36px;
    padding: 0 11px;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    border: 1px solid var(--line);
    border-radius: 10px;
    color: var(--muted);
    background: var(--panel-soft);
    font-size: 11px;
    font-weight: 700;
    transition: .2s ease;
}

.tool-button:hover,
.tool-button.active {
    color: var(--text);
    border-color: rgba(78, 164, 255, .38);
    background: rgba(78, 164, 255, .11);
}

.viewer-stage {
    position: relative;
    min-height: 350px;
    overflow: hidden;
    background:
        linear-gradient(rgba(107, 140, 177, .07) 1px, transparent 1px),
        linear-gradient(90deg, rgba(107, 140, 177, .07) 1px, transparent 1px),
        radial-gradient(circle at 50% 44%, rgba(43, 91, 145, .18), transparent 42%),
        #07101c;
    background-size: 34px 34px, 34px 34px, auto, auto;
}

:root[data-theme="light"] .viewer-stage {
    background:
        linear-gradient(rgba(50, 88, 125, .08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(50, 88, 125, .08) 1px, transparent 1px),
        radial-gradient(circle at 50% 44%, rgba(78, 164, 255, .12), transparent 43%),
        #eaf2fa;
    background-size: 34px 34px, 34px 34px, auto, auto;
}

#pulleyCanvas {
    width: 100%;
    height: 100%;
    display: block;
    touch-action: none;
    
}

.viewer-message {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    background: rgba(5, 11, 19, .58);
    backdrop-filter: blur(7px);
    transition: opacity .25s ease, visibility .25s ease;
}

.viewer-message.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.viewer-message strong {
    color: var(--text);
    font-size: 13px;
}

.viewer-message small {
    margin-top: 4px;
    font-size: 11px;
}

.viewer-message.error .large-spinner {
    display: none;
}

.viewer-message.error strong {
    color: var(--danger);
}

.center-distance-overlay {
    position: absolute;
    top: 14px;
    left: 50%;
    z-index: 3;
    min-width: 230px;
    padding: 10px 16px 9px;
    transform: translateX(-50%);
    border: 1px solid rgba(255, 138, 30, .34);
    border-radius: 14px;
    color: var(--text);
    background:
        linear-gradient(145deg, rgba(255, 138, 30, .17), rgba(5, 13, 23, .83));
    box-shadow: 0 14px 35px rgba(0, 0, 0, .24), inset 0 1px rgba(255, 255, 255, .05);
    backdrop-filter: blur(12px);
    pointer-events: none;
    text-align: center;
}

:root[data-theme="light"] .center-distance-overlay {
    background: linear-gradient(145deg, rgba(255, 138, 30, .18), rgba(255, 255, 255, .88));
    box-shadow: 0 14px 30px rgba(31, 57, 84, .14), inset 0 1px rgba(255, 255, 255, .7);
}

.center-distance-overlay.has-value {
    animation: centerValuePulse .38s ease;
}

.measure-title {
    display: block;
    color: var(--muted);
    font-size: 9px;
    font-weight: 800;
    letter-spacing: .13em;
    text-transform: uppercase;
}

.measure-value-row {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 9px;
    margin-top: 2px;
}

.measure-value-row::before,
.measure-value-row::after {
    content: "";
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 138, 30, .85));
}

.measure-value-row::after {
    background: linear-gradient(90deg, rgba(255, 138, 30, .85), transparent);
}

.measure-value-row strong {
    color: #ffad5f;
    font-size: 22px;
    font-variant-numeric: tabular-nums;
    letter-spacing: -.025em;
    text-shadow: 0 0 18px rgba(255, 138, 30, .24);
    white-space: nowrap;
}

:root[data-theme="light"] .measure-value-row strong {
    color: #d96800;
}

.measure-tick {
    display: none;
}

.center-distance-overlay small {
    display: block;
    margin-top: 2px;
    color: var(--subtle);
    font-size: 10px;
    font-variant-numeric: tabular-nums;
}

.center-distance-overlay small:last-child {
    color: var(--muted);
    font-size: 9px;
    letter-spacing: .03em;
}

@keyframes centerValuePulse {
    0% { transform: translateX(-50%) scale(.97); filter: brightness(1.35); }
    100% { transform: translateX(-50%) scale(1); filter: brightness(1); }
}

.viewer-hint {
    position: absolute;
    left: 13px;
    bottom: 11px;
    padding: 7px 10px;
    border: 1px solid rgba(255,255,255,.08);
    border-radius: 9px;
    color: rgba(210, 225, 243, .55);
    background: rgba(4, 10, 18, .42);
    font-size: 10px;
    pointer-events: none;
}

.axis-legend {
    position: absolute;
    right: 13px;
    bottom: 11px;
    display: flex;
    gap: 5px;
    pointer-events: none;
}

.axis {
    width: 22px;
    height: 22px;
    display: grid;
    place-items: center;
    border-radius: 7px;
    background: rgba(4, 10, 18, .48);
    font-size: 9px;
    font-weight: 900;
}

.axis.x { color: #ff6476; }
.axis.y { color: #63e6a6; }
.axis.z { color: #4ea4ff; }

.results-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
}

.result-card {
    min-width: 0;
    min-height: 105px;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 13px;
    border-radius: 16px;
}

.primary-result {
    border-color: rgba(255, 138, 30, .3);
    background: linear-gradient(145deg, rgba(255, 138, 30, .13), var(--panel));
}

.result-icon {
    width: 36px;
    height: 36px;
    flex: 0 0 auto;
    display: grid;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 11px;
    color: var(--blue);
    background: var(--panel-soft);
    font-size: 18px;
}

.primary-result .result-icon {
    color: var(--accent-2);
    border-color: rgba(255, 138, 30, .24);
    background: rgba(255, 138, 30, .08);
}

.result-label,
.engineering-strip span {
    display: block;
    color: var(--muted);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: .03em;
}

.result-card strong {
    display: block;
    margin-top: 4px;
    overflow: hidden;
    color: var(--text);
    font-size: 19px;
    letter-spacing: -.025em;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.result-card small {
    display: block;
    margin-top: 2px;
    color: var(--subtle);
    font-size: 10px;
}

.engineering-strip {
    min-height: 74px;
    padding: 13px 17px;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: center;
    gap: 12px;
    border-radius: 15px;
    box-shadow: none;
}

.engineering-strip > div:not(:last-child) {
    border-right: 1px solid var(--line);
}

.engineering-strip strong {
    display: block;
    margin-top: 5px;
    font-size: 13px;
}

.status-ok {
    color: var(--success);
}

.footer {
    min-height: 45px;
    padding: 0 25px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
    border-top: 1px solid var(--line);
    color: var(--subtle);
    font-size: 10px;
}

.toast {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 60;
    max-width: min(390px, calc(100vw - 36px));
    padding: 12px 15px;
    border: 1px solid rgba(255, 100, 118, .32);
    border-radius: 12px;
    color: #fff;
    background: rgba(93, 21, 34, .93);
    box-shadow: 0 18px 50px rgba(0,0,0,.42);
    font-size: 12px;
    opacity: 0;
    transform: translateY(12px);
    pointer-events: none;
    transition: .25s ease;
}

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

.viewer-card:fullscreen {
    width: 100vw;
    height: 100vh;
    border: 0;
    border-radius: 0;
    background: var(--bg);
}

.viewer-card:fullscreen .viewer-stage {
    min-height: 0;
}

@media (max-width: 1180px) {
    .workspace {
        grid-template-columns: 345px minmax(0, 1fr);
    }

    .results-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 900px) {
    .topbar {
        padding: 0 16px;
    }

    .engine-pill {
        display: none;
    }

    .workspace {
        grid-template-columns: 1fr;
        padding: 13px;
    }

    .control-panel {
        max-height: none;
    }

    .visual-workspace {
        grid-template-rows: minmax(460px, 62vh) auto auto;
    }
}

@media (max-width: 620px) {
    :root { --topbar-height: 66px; }

    .brand small,
    .tool-button span:last-child,
    .viewer-hint {
        display: none;
    }

    .workspace {
        padding: 9px;
        gap: 11px;
    }

    .control-panel {
        padding: 16px;
        border-radius: 16px;
    }

    .three-columns {
        grid-template-columns: 1fr;
    }

    .viewer-header {
        padding: 12px;
    }

    .viewer-tools {
        gap: 4px;
    }

    .tool-button {
        width: 36px;
        padding: 0;
        justify-content: center;
    }

    .results-grid,
    .engineering-strip {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .engineering-strip > div:not(:last-child) {
        border-right: 0;
    }

    .result-card {
        min-height: 92px;
        padding: 12px;
    }

    .result-icon {
        width: 31px;
        height: 31px;
    }

    .result-card strong {
        font-size: 15px;
    }

    .footer {
        padding: 12px 15px;
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
    }
}


@media (max-width: 560px) {
    .center-distance-overlay {
        top: 10px;
        min-width: 190px;
        padding: 8px 12px 7px;
    }

    .measure-value-row strong {
        font-size: 18px;
    }
}