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

:root {
    --bg0: #fcfbf9;
    --bg1: #fcfbf9;
    --bg2: #f2efe9;
    --bg3: #e8e4db;
    --border: #e5e1d8;
    --border-hi: #d1cbc0;
    --accent: #d90f2b;
    --accent-dim: #a60a20;
    --accent-bg: rgba(217, 15, 43, 0.06);
    --amber: #b06500;
    --amber-bg: rgba(176, 101, 0, 0.08);
    --green: #0f8a3d;
    --green-bg: rgba(15, 138, 61, 0.08);
    --red: #d90f2b;
    --red-bg: rgba(217, 15, 43, 0.08);
    --text: #2b2a29;
    --text-muted: #6b6863;
    --text-dim: #8c8880;

    --panel-w: 320px;
    --header-h: 70px;
    --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-serif: 'Lora', 'Georgia', serif;
    --font-mono: ui-monospace, 'Menlo', 'Monaco', 'Consolas', monospace;
}

:root[data-theme="dark"] {
    --bg0: #1a1918;
    --bg1: #1a1918;
    --bg2: #242322;
    --bg3: #33312e;
    --border: #33312e;
    --border-hi: #4a4743;
    --accent: #ff4d6a;
    --accent-dim: #cc3d55;
    --accent-bg: rgba(255, 77, 106, 0.15);
    --amber: #f0a84d;
    --amber-bg: rgba(240, 168, 77, 0.15);
    --green: #4ade80;
    --green-bg: rgba(74, 222, 128, 0.15);
    --red: #ff4d6a;
    --red-bg: rgba(255, 77, 106, 0.15);
    --text: #e8e6e1;
    --text-muted: #a3a099;
    --text-dim: #807d78;
}

html,
body {
    height: 100%;
    overflow: hidden;
    background: var(--bg0);
    color: var(--text);
    font-family: var(--font-ui);
    font-size: 14px;
    line-height: 1.5;
    transition: background 0.3s, color 0.3s;
}

/* ─── LAYOUT ─── */
#app {
    display: grid;
    grid-template-rows: var(--header-h) 1fr;
    grid-template-columns: var(--panel-w) 1fr var(--panel-w);
    height: 100vh;
    transition: grid-template-columns 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

#app.hide-left {
    grid-template-columns: 0px 1fr var(--panel-w);
}

#app.hide-right {
    grid-template-columns: var(--panel-w) 1fr 0px;
}

#app.hide-left.hide-right {
    grid-template-columns: 0px 1fr 0px;
}

aside {
    overflow-x: hidden !important;
}

.panel-toggle {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--bg0);
    border: 1px solid var(--border-hi);
    color: var(--text-muted);
    width: 24px;
    height: 56px;
    cursor: pointer;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.panel-toggle:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.panel-toggle.left {
    left: 0;
    border-left: none;
    border-radius: 0 6px 6px 0;
}

.panel-toggle.right {
    right: 0;
    border-right: none;
    border-radius: 6px 0 0 6px;
}

#header {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 0 24px;
    background: var(--bg1);
    border-bottom: 1px solid var(--border);
    z-index: 10;
    transition: background 0.3s, border-color 0.3s;
}

#sidebar-left {
    background: var(--bg1);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    transition: background 0.3s, border-color 0.3s;
}

#sidebar-right {
    background: var(--bg1);
    border-left: 1px solid var(--border);
    overflow-y: auto;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    transition: background 0.3s, border-color 0.3s;
}

#canvas-area {
    position: relative;
    overflow: hidden;
    background-color: var(--bg2);
    background-image:
        linear-gradient(45deg, var(--bg3) 25%, transparent 25%, transparent 75%, var(--bg3) 75%, var(--bg3)),
        linear-gradient(45deg, var(--bg3) 25%, transparent 25%, transparent 75%, var(--bg3) 75%, var(--bg3));
    background-size: 20px 20px;
    background-position: 0 0, 10px 10px;
    transition: background-color 0.3s;
}

/* ─── SCROLLBAR ─── */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-hi);
    border-radius: 3px;
}

/* ─── HEADER ─── */
.logo {
    font-family: var(--font-serif);
    font-size: 20px;
    font-style: italic;
    font-weight: 500;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 6px;
}

.logo .stars {
    color: var(--accent);
    font-size: 32px;
    font-style: normal;
    line-height: 0;
    position: relative;
    top: 5px;
    font-weight: 600;
}

.header-sep {
    flex: 1;
}

.badge {
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.03em;
    color: var(--text-muted);
    background: transparent;
    padding: 4px 0;
    display: flex;
    align-items: center;
    gap: 4px;
}

.badge .accent-letter {
    color: var(--text-dim);
    display: inline-block;
    width: 12px;
    opacity: 0.5;
    font-weight: 400;
}

.badge.active {
    color: var(--green);
}

#btn-theme {
    font-size: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 6px;
    opacity: 0.8;
    transition: opacity 0.2s;
}

#btn-theme:hover {
    opacity: 1;
    background: var(--bg2);
}

.text-link {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 16px;
    background: transparent;
    color: var(--accent);
    border: none;
    border-bottom: 2px dotted var(--accent);
    padding: 4px 6px;
    border-radius: 0;
    cursor: pointer;
    transition: background 0.2s;
}

.text-link:hover:not(:disabled) {
    background: var(--accent-bg);
}

.text-link:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    border-bottom-style: solid;
}

/* ─── PANEL SECTIONS ─── */
.section {
    padding: 24px;
    border-bottom: 1px solid var(--border);
}

.section-title {
    font-family: var(--font-serif);
    font-size: 18px;
    font-style: italic;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 16px;
}

/* ─── UPLOAD ZONE ─── */
#drop-zone {
    border: 1.5px dashed var(--border-hi);
    border-radius: 8px;
    padding: 32px 16px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--bg0);
}

#drop-zone:hover,
#drop-zone.drag-over {
    border-color: var(--accent);
    background: var(--accent-bg);
}

#drop-zone svg {
    display: block;
    margin: 0 auto 12px;
    opacity: 0.6;
    stroke: var(--text-muted);
    transition: stroke 0.2s;
}

#drop-zone:hover svg {
    stroke: var(--accent);
    opacity: 1;
}

#drop-zone .dz-title {
    font-family: var(--font-serif);
    font-size: 16px;
    font-style: italic;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 4px;
}

#drop-zone .dz-sub {
    font-size: 13px;
    color: var(--text-muted);
}

#file-input {
    display: none;
}

#storm-info {
    display: none;
    font-size: 13px;
    color: var(--accent);
    background: var(--accent-bg);
    border: 1px dashed var(--accent);
    border-radius: 6px;
    padding: 10px 14px;
    line-height: 1.6;
}

/* ─── MAP SOURCE ─── */
#map-status {
    font-size: 13px;
    padding: 10px 14px;
    border-radius: 6px;
    line-height: 1.5;
    font-weight: 500;
}

#map-status.loading {
    color: var(--amber);
    background: var(--amber-bg);
    border: 1px dashed var(--amber);
}

#map-status.loaded {
    color: var(--green);
    background: var(--green-bg);
    border: 1px dashed var(--green);
}

#map-status.error {
    color: var(--red);
    background: var(--red-bg);
    border: 1px dashed var(--red);
}

/* ─── CONTROLS ─── */
.ctrl-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 14px;
}

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

.ctrl-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    white-space: nowrap;
    flex-shrink: 0;
    min-width: 90px;
}

.ctrl-label.mono {
    font-family: var(--font-mono);
    font-size: 12px;
    min-width: 80px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.ctrl-val {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--amber);
    min-width: 44px;
    text-align: right;
    flex-shrink: 0;
}

input[type=range] {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 4px;
    background: var(--bg3);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
    background-image: linear-gradient(var(--accent), var(--accent));
    background-size: var(--fill, 50%) 100%;
    background-repeat: no-repeat;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg0);
    border: 2px solid var(--accent);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    cursor: pointer;
}

input[type=range]:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

.toggle-row .ctrl-label {
    min-width: unset;
}

.toggle {
    position: relative;
    width: 38px;
    height: 20px;
    flex-shrink: 0;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-track {
    position: absolute;
    inset: 0;
    background: var(--bg3);
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
    border: 1px solid var(--border-hi);
}

.toggle input:checked+.toggle-track {
    background: var(--accent-bg);
    border-color: var(--accent);
}

.toggle-track::after {
    content: '';
    position: absolute;
    left: 2px;
    top: 2px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--text-muted);
    transition: transform 0.2s, background 0.2s;
}

/* ─── HELP ICON ─── */
.help-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--bg3);
    color: var(--text-muted);
    font-size: 9px;
    font-weight: bold;
    cursor: help;
    margin-left: 4px;
    border: 1px solid var(--border-hi);
    vertical-align: middle;
    transition: all 0.2s;
    font-family: var(--font-ui);
}

.help-icon:hover {
    background: var(--accent);
    color: var(--bg0);
    border-color: var(--accent);
}


.toggle input:checked+.toggle-track::after {
    transform: translateX(18px);
    background: var(--accent);
}

.btn-row {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}

.btn {
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 6px;
    border: 1px solid var(--border-hi);
    background: transparent;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
    flex: 1;
}

.btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.btn.active {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-bg);
}

.btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.btn.danger {
    border-color: var(--border-hi);
}

.btn.danger:hover {
    border-color: var(--red);
    color: var(--red);
    background: var(--red-bg);
}

/* ─── NUMBER INPUTS ─── */
.num-input-wrap {
    display: flex;
    gap: 4px;
}

input[type=number],
select {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--text);
    background: var(--bg0);
    border: 1px solid var(--border-hi);
    border-radius: 4px;
    padding: 6px 8px;
    width: 64px;
    outline: none;
    text-align: right;
    transition: border-color 0.2s;
}

input[type=number]:focus,
select:focus {
    border-color: var(--accent);
}

input[type=number]::-webkit-inner-spin-button {
    -webkit-appearance: none;
}

/* ─── CANVAS AREA ─── */
#main-canvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    cursor: crosshair;
}

/* HUD */
.hud {
    position: absolute;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text);
    background: var(--bg0);
    border: 1px solid var(--border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    padding: 8px 12px;
    border-radius: 6px;
    pointer-events: none;
    transition: background 0.3s, color 0.3s;
}

#hud-coords {
    bottom: 16px;
    left: 16px;
}

#hud-mode {
    top: 16px;
    left: 16px;
}

#hud-perf {
    top: 16px;
    right: 16px;
    color: var(--amber);
}

/* drop hint */
#empty-hint {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    pointer-events: none;
}

#empty-hint .eh-text {
    font-family: var(--font-serif);
    font-size: 22px;
    font-style: italic;
    font-weight: 500;
    color: var(--text);
}

#empty-hint .eh-sub {
    font-size: 14px;
    color: var(--text-dim);
}

#empty-hint svg {
    opacity: 0.15;
    stroke: var(--text-muted);
    margin-bottom: 8px;
}

/* ─── PERF PANEL & NOTES ─── */
.perf-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.perf-bar-wrap {
    flex: 1;
    height: 6px;
    background: var(--bg3);
    border-radius: 3px;
    margin: 0 12px;
    overflow: hidden;
}

.perf-bar {
    height: 100%;
    background: var(--green);
    border-radius: 3px;
    transition: width 0.3s;
}

.perf-val {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--amber);
    min-width: 50px;
    text-align: right;
}

.note {
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-dim);
    border-left: 2px solid var(--accent);
    padding-left: 16px;
    margin-top: 16px;
}

.note strong {
    color: var(--text);
    font-weight: 600;
}

/* ─── COORDS INPUT ─── */
.coord-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.coord-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.coord-item label {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* ─── SEPARATOR ─── */
.sep {
    height: 1px;
    background: var(--border);
    margin: 6px 0 14px 0;
}

/* ─── STORM BOUNDARY BOX ─── */
#storm-box {
    position: absolute;
    border: 1.5px dashed var(--accent);
    pointer-events: none;
    display: none;
    opacity: 0.5;
}

.spacer {
    flex: 1;
}