/* ─── Variables ─────────────────────────────────────────────────────────────── */
:root {
    /* Apple Dark Mode HIG */
    --bg:          #000000;
    --bg2:         #1c1c1e;
    --glass:       rgba(28, 28, 30, 0.65);
    --glass-mid:   rgba(44, 44, 46, 0.55);
    --glass-light: rgba(58, 58, 60, 0.45);
    --border:      rgba(255, 255, 255, 0.1);
    --border-hi:   rgba(255, 255, 255, 0.2);
    --txt:         #ffffff;
    --txt2:        #ebebf5; /* secondary label */
    --txt3:        #8e8e93; /* tertiary label */
    
    /* Apple System Colors (Dark) */
    --blue:        #0a84ff;
    --blue-dim:    rgba(10, 132, 255, 0.15);
    --blue-glow:   rgba(10, 132, 255, 0.25);
    --green:       #30d158;
    --green-dim:   rgba(48, 209, 88, 0.15);
    --amber:       #ff9f0a; /* Apple Orange-Yellow */
    --amber-dim:   rgba(255, 159, 10, 0.15);
    --orange:      #ff9500;
    --orange-dim:  rgba(255, 149, 0, 0.15);
    --red:         #ff453a;
    --red-dim:     rgba(255, 69, 58, 0.15);
    --gray:        #8e8e93;

    /* Apple Dimensions & Shadows */
    --radius:      22px; /* iOS Widget / Sheet corner radius */
    --radius-sm:   12px;
    --shadow:      0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-sm:   0 2px 12px rgba(0, 0, 0, 0.2);
    
    --font-en:     -apple-system, BlinkMacSystemFont, "SF Pro", "SF Pro Text", "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
    --font-si:     'Noto Sans Sinhala', -apple-system, BlinkMacSystemFont, "SF Pro", sans-serif;
    --font-ta:     'Noto Sans Tamil', -apple-system, BlinkMacSystemFont, "SF Pro", sans-serif;
    --transition:  all 0.25s cubic-bezier(0.25, 1, 0.5, 1); /* iOS springy transition */
}

body.light-theme {
    /* Apple Light Mode HIG */
    --bg:          #f2f2f7;
    --bg2:         #ffffff;
    --glass:       rgba(255, 255, 255, 0.75);
    --glass-mid:   rgba(255, 255, 255, 0.85);
    --glass-light: rgba(255, 255, 255, 0.95);
    --border:      rgba(0, 0, 0, 0.08);
    --border-hi:   rgba(0, 0, 0, 0.15);
    --txt:         #000000;
    --txt2:        #3c3c43;
    --txt3:        #8e8e93;
    
    /* Apple System Colors (Light) */
    --blue:        #007aff;
    --blue-dim:    rgba(0, 122, 255, 0.12);
    --blue-glow:   rgba(0, 122, 255, 0.2);
    --green:       #34c759;
    --amber:       #ff9500;
    --red:         #ff3b30;
    
    --shadow:      0 8px 32px rgba(0, 0, 0, 0.08);
    --shadow-sm:   0 2px 10px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: var(--font-en);
    background: var(--bg);
    color: var(--txt);
    height: 100vh; width: 100vw;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}
body[lang="si"] { font-family: var(--font-si); }
body[lang="ta"] { font-family: var(--font-ta); }

/* ─── Map ───────────────────────────────────────────────────────────────────── */
#map {
    position: fixed; inset: 0;
    z-index: 0;
    background: var(--bg);
}
.leaflet-container { background: var(--bg) !important; }

/* ─── Loading overlay ───────────────────────────────────────────────────────── */
#loading-overlay {
    position: fixed; inset: 0;
    background: var(--bg);
    z-index: 9999;
    display: flex; align-items: center; justify-content: center;
    flex-direction: column; gap: 20px;
    transition: opacity 0.6s ease;
}
#loading-overlay.hidden { opacity: 0; pointer-events: none; display: none; }

.loader-content {
    display: flex; flex-direction: column; align-items: center; gap: 16px;
    color: var(--txt2); font-size: 0.85rem; letter-spacing: 0.3px;
}
.loader-logo {
    font-size: 2rem; font-weight: 800;
    background: linear-gradient(135deg, var(--blue), #a78bfa);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}
.spinner {
    width: 40px; height: 40px;
    border: 3px solid rgba(255,255,255,0.06);
    border-top-color: var(--blue);
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Glass panel base ──────────────────────────────────────────────────────── */
#ctrl-panel, #basin-panel, #gauge-detail {
    position: fixed;
    z-index: 800;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    backdrop-filter: blur(40px) saturate(1.8);
    -webkit-backdrop-filter: blur(40px) saturate(1.8);
}

/* Gradient top-border accent */
#ctrl-panel::before,
#basin-panel::before,
#gauge-detail::before {
    content: '';
    position: absolute; top: 0; left: 16px; right: 16px; height: 1px;
    background: linear-gradient(90deg, transparent, rgba(79,140,255,0.5), transparent);
    border-radius: 1px;
}

/* ─── Control panel (top-left) ──────────────────────────────────────────────── */
#ctrl-panel {
    top: 16px; left: 16px;
    width: 296px;
    animation: slideDown 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-18px); }
    to   { opacity: 1; transform: translateY(0); }
}

.ctrl-header {
    display: flex; align-items: flex-start;
    justify-content: space-between;
    padding: 16px 16px 12px;
    gap: 10px;
}
.title-block { display: flex; align-items: center; gap: 12px; flex: 1; min-width: 0; }

.app-title {
    font-size: 1.1rem; font-weight: 700;
    display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
    letter-spacing: -0.3px;
}
.badge {
    background: linear-gradient(135deg, #ff4757, #c0392b);
    color: #fff;
    font-size: 0.56rem; padding: 2px 7px;
    border-radius: 6px; font-weight: 800;
    letter-spacing: 1px; text-transform: uppercase;
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(255,71,87,0.4);
    animation: badgePulse 3s ease-in-out infinite;
}
@keyframes badgePulse {
    0%, 100% { box-shadow: 0 2px 8px rgba(255,71,87,0.4); }
    50%       { box-shadow: 0 2px 16px rgba(255,71,87,0.7); }
}
.subtitle { font-size: 0.74rem; color: var(--txt2); margin-top: 3px; letter-spacing: 0.1px; }

/* Live pulse dot */
.pulse-ring {
    width: 11px; height: 11px; flex-shrink: 0;
    background: var(--red);
    border-radius: 50%;
    position: relative;
}
.pulse-ring::after {
    content: '';
    position: absolute; inset: -5px;
    border-radius: 50%;
    border: 2px solid var(--red);
    animation: pulse 1.8s ease-out infinite;
}
@keyframes pulse {
    0%   { transform: scale(0.6); opacity: 1; }
    100% { transform: scale(2.2); opacity: 0; }
}

/* Ctrl body */
#ctrl-body { padding: 0 14px 16px; display: flex; flex-direction: column; gap: 12px; }
#ctrl-panel.collapsed #ctrl-body { display: none; }
#ctrl-panel.collapsed .ctrl-header { padding-bottom: 16px; }

/* ─── Stat cards ────────────────────────────────────────────────────────────── */
.stats-row { display: flex; gap: 8px; }
.stat-card {
    flex: 1;
    background: rgba(255,255,255,0.033);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 8px 9px;
    display: flex; flex-direction: column; align-items: center;
    transition: var(--transition);
    position: relative; overflow: hidden;
}
.stat-card::after {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; height: 2px;
    border-radius: 2px;
    background: var(--gray);
    opacity: 0.4;
}
.stat-card:hover { background: rgba(255,255,255,0.06); transform: translateY(-1px); }
.stat-card.warn::after  { background: var(--amber); opacity: 0.7; }
.stat-card.danger::after { background: var(--red); opacity: 0.7; }

.stat-label {
    font-size: 0.58rem; color: var(--txt2);
    text-transform: uppercase; letter-spacing: 0.6px;
    margin-bottom: 4px; text-align: center;
}
.stat-val   { font-size: 1.5rem; font-weight: 800; letter-spacing: -1px; }
.stat-card.warn .stat-val   { color: var(--amber); text-shadow: 0 0 20px rgba(245,166,35,0.35); }
.stat-card.danger .stat-val { color: var(--red);   text-shadow: 0 0 20px rgba(255,71,87,0.35); }

/* ─── Search bar ────────────────────────────────────────────────────────────── */
.search-bar {
    display: flex; align-items: center;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: var(--transition);
}
.search-bar:focus-within {
    border-color: rgba(79,140,255,0.45);
    background: rgba(79,140,255,0.05);
    box-shadow: 0 0 0 3px rgba(79,140,255,0.1);
}
.search-icon { padding: 0 8px 0 11px; color: var(--txt3); font-size: 1.05rem; flex-shrink: 0; }
#gauge-search {
    flex: 1;
    background: none; border: none;
    color: var(--txt); font-family: inherit; font-size: 0.82rem;
    padding: 9px 0;
    outline: none;
}
#gauge-search::placeholder { color: var(--txt3); }
#clear-search {
    padding: 0 11px; background: none; border: none;
    color: var(--txt3); cursor: pointer; font-size: 0.75rem;
    display: none; transition: color 0.15s;
}
#clear-search:hover { color: var(--txt); }
#clear-search.visible { display: block; }

/* ─── Refresh & View Mode Rows ──────────────────────────────────────────────── */
.refresh-row, .view-mode-row {
    display: flex; align-items: center; justify-content: space-between;
    font-size: 0.74rem; color: var(--txt2);
    padding: 6px 10px;
    background: rgba(255,255,255,0.025);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
}
.refresh-text, .view-mode-label { display: flex; align-items: center; gap: 6px; }
#refresh-count { font-weight: 700; font-size: 0.8rem; font-variant-numeric: tabular-nums; }

/* ─── Icon buttons ──────────────────────────────────────────────────────────── */
.icon-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--txt2);
    cursor: pointer;
    padding: 6px 10px;
    font-size: 0.88rem; line-height: 1;
    transition: var(--transition);
    white-space: nowrap; flex-shrink: 0;
}
.icon-btn:hover {
    background: rgba(255,255,255,0.11); color: var(--txt);
    border-color: var(--border-hi); transform: scale(1.05);
}
.icon-btn.sm { padding: 4px 7px; font-size: 0.78rem; }

/* ─── Basin panel (top-right) ───────────────────────────────────────────────── */
#basin-panel {
    top: 16px; right: 16px;
    width: 222px;
    max-height: calc(100vh - 160px);
    display: flex; flex-direction: column;
    animation: slideDown 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.08s both;
}
.panel-header {
    display: flex; align-items: center;
    justify-content: space-between;
    padding: 13px 14px 11px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.panel-title {
    font-size: 0.68rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.8px;
    color: var(--txt2);
}

#basin-body {
    overflow-y: auto; flex: 1;
    padding: 6px 8px 10px;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.1) transparent;
}
#basin-body::-webkit-scrollbar { width: 4px; }
#basin-body::-webkit-scrollbar-track { background: transparent; }
#basin-body::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 4px; }
#basin-panel.collapsed #basin-body { display: none; }

#river-ul { list-style: none; display: flex; flex-direction: column; gap: 2px; }
#river-ul li {
    display: flex; justify-content: space-between; align-items: center;
    padding: 6px 10px; border-radius: 9px;
    font-size: 0.78rem; color: var(--txt2);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
}
#river-ul li:hover  { background: rgba(255,255,255,0.06); color: var(--txt); border-color: var(--border); }
#river-ul li.active {
    background: var(--blue-dim);
    color: #93c5fd;
    border-color: rgba(79,140,255,0.3);
    border-left: 2px solid var(--blue);
}
#river-ul li .cnt {
    background: rgba(255,255,255,0.08);
    padding: 1px 7px; border-radius: 20px;
    font-size: 0.64rem; font-weight: 700; flex-shrink: 0;
    font-variant-numeric: tabular-nums;
}
#river-ul li.active .cnt { background: rgba(79,140,255,0.25); color: #93c5fd; }

/* ─── Legend (bottom-right) ─────────────────────────────────────────────────── */
#legend {
    bottom: 20px; right: 16px;
    padding: 14px 16px;
    min-width: 168px;
    animation: slideUp 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.15s both;
}
@keyframes slideUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}
#legend .panel-title { margin-bottom: 10px; color: var(--txt2); }
#legend ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
#legend li { display: flex; align-items: center; gap: 10px; font-size: 0.78rem; color: var(--txt2); }
.dot {
    width: 9px; height: 9px;
    border-radius: 50%; flex-shrink: 0;
    position: relative;
}
.dot.normal    { background: var(--green);  box-shadow: 0 0 8px rgba(16,212,126,0.6); }
.dot.dot-alert { background: var(--amber);  box-shadow: 0 0 8px rgba(245,166,35,0.6); }
.dot.minor     { background: var(--orange); box-shadow: 0 0 8px rgba(255,107,53,0.6); }
.dot.major     { background: var(--red);    box-shadow: 0 0 8px rgba(255,71,87,0.6); }
.dot.nodata    { background: var(--gray);   box-shadow: 0 0 4px rgba(75,94,122,0.4); }
.last-upd {
    margin-top: 12px;
    font-size: 0.68rem; color: var(--txt3);
    border-top: 1px solid var(--border);
    padding-top: 10px; line-height: 1.5;
}

/* ─── Gauge detail (bottom-left) ────────────────────────────────────────────── */
#gauge-detail {
    bottom: 20px; left: 16px;
    width: 390px;
    padding: 0;
    overflow: hidden;
    animation: slideUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
#gauge-detail.hidden { display: none; }

.gd-header {
    display: flex; justify-content: space-between; align-items: flex-start;
    padding: 16px 16px 13px;
    border-bottom: 1px solid var(--border);
    background: rgba(255,255,255,0.02);
}
.gd-title-block h2 {
    font-size: 1.05rem; font-weight: 700;
    letter-spacing: -0.3px; line-height: 1.2;
}
.gd-basin-tag {
    display: inline-flex; align-items: center; gap: 5px;
    margin-top: 4px;
    font-size: 0.7rem; color: var(--blue);
    background: var(--blue-dim);
    padding: 2px 8px; border-radius: 6px;
    font-weight: 600;
}

.gd-body { display: flex; gap: 0; }

/* Tube gauge */
.gd-tube-col {
    display: flex; gap: 8px; flex-shrink: 0;
    padding: 14px 10px 14px 16px;
    border-right: 1px solid var(--border);
    background: rgba(255,255,255,0.015);
}
.tube-wrap {
    width: 36px; height: 200px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    border-radius: 18px;
    overflow: hidden;
    position: relative;
}
.tube-fill {
    position: absolute; bottom: 0; left: 0; right: 0;
    border-radius: 0 0 16px 16px;
    transition: height 1.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.t-line {
    position: absolute; left: 0; right: 0; height: 2px;
    opacity: 0.85;
}
.t-cursor {
    position: absolute; left: -3px; right: -3px; height: 2px;
    background: #fff;
    box-shadow: 0 0 8px 3px rgba(255,255,255,0.55);
    transition: bottom 1.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}
/* Text labels removed at user request */

/* Data column */
.gd-data {
    flex: 1; display: flex; flex-direction: column; gap: 0;
    padding: 14px 14px 14px 14px;
}
.gd-row {
    display: flex; justify-content: space-between; align-items: center;
    font-size: 0.79rem; padding: 5px 0;
    border-bottom: 1px solid rgba(255,255,255,0.04);
}
.gd-row:last-child { border-bottom: none; }
.gd-row > span { color: var(--txt2); font-size: 0.76rem; }
.gd-row > strong { font-weight: 700; font-variant-numeric: tabular-nums; }
.gd-row.alert-c > span,  .gd-row.alert-c > strong  { color: var(--amber); }
.gd-row.minor-c > span,  .gd-row.minor-c > strong  { color: var(--orange); }
.gd-row.major-c > span,  .gd-row.major-c > strong  { color: var(--red); }
.gd-sep { border: none; border-top: 1px solid var(--border); margin: 4px 0; }
.gd-time { font-size: 0.67rem !important; color: var(--txt3) !important; font-weight: 500 !important; }

/* Status pill */
.status-pill {
    padding: 2px 10px; border-radius: 7px;
    font-size: 0.68rem; font-weight: 800;
    text-transform: uppercase; letter-spacing: 0.5px;
    white-space: nowrap;
}
.status-pill.normal      { background: var(--green-dim);  color: var(--green); }
.status-pill.alert       { background: var(--amber-dim);  color: var(--amber); }
.status-pill.minor_flood { background: var(--orange-dim); color: var(--orange); }
.status-pill.major_flood { background: var(--red-dim);    color: var(--red); }
.status-pill.no_data     { background: rgba(75,94,122,0.15); color: var(--gray); }

/* ─── Map markers ───────────────────────────────────────────────────────────── */
.marker-icon { transition: all 0.25s ease; }
.custom-marker {
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.85);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.25s;
}
.marker-dimmed    { opacity: 0.15 !important; filter: grayscale(70%); }
.marker-highlight { z-index: 1000 !important; }
.marker-highlight .custom-marker { transform: scale(1.65); box-shadow: 0 0 20px rgba(255,255,255,0.75); }

/* ─── Leaflet overrides ─────────────────────────────────────────────────────── */
.leaflet-popup-content-wrapper, .leaflet-popup-tip {
    background: var(--glass) !important;
    color: var(--txt) !important;
    border: 1px solid var(--border-hi) !important;
    box-shadow: var(--shadow) !important;
    border-radius: 12px !important;
    backdrop-filter: blur(24px);
}
.leaflet-popup-content { margin: 14px 16px !important; font-family: inherit; font-size: 0.82rem; }
.leaflet-container a.leaflet-popup-close-button { color: var(--txt2) !important; }

/* Tooltip */
.river-tooltip,
.leaflet-tooltip {
    background: var(--glass) !important;
    border: 1px solid var(--border-hi) !important;
    color: var(--txt) !important;
    font-size: 0.74rem !important;
    font-family: inherit !important;
    border-radius: 8px !important;
    padding: 5px 10px !important;
    backdrop-filter: blur(16px);
    box-shadow: var(--shadow-sm) !important;
}
.leaflet-tooltip::before { display: none !important; }

/* ─── Zoom controls ─────────────────────────────────────────────────────────── */
.leaflet-top.leaflet-right { top: auto; bottom: 24px; right: 256px; }
.leaflet-control-zoom {
    border: 1px solid var(--border-hi) !important;
    box-shadow: var(--shadow-sm) !important;
    border-radius: var(--radius-sm) !important;
    overflow: hidden;
}
.leaflet-control-zoom-in, .leaflet-control-zoom-out {
    background: var(--glass) !important;
    color: var(--txt) !important;
    backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border) !important;
    transition: background 0.15s !important;
    width: 34px !important; height: 34px !important;
    line-height: 34px !important;
    font-size: 1.1rem !important;
}
.leaflet-control-zoom-in:hover, .leaflet-control-zoom-out:hover {
    background: var(--glass-light) !important;
    color: var(--txt) !important;
}

/* Leaflet attribution */
.leaflet-control-attribution {
    background: rgba(6,13,35,0.75) !important;
    color: var(--txt3) !important;
    font-size: 0.62rem !important;
    backdrop-filter: blur(8px);
}
.leaflet-control-attribution a { color: var(--txt2) !important; }

/* ─── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
    #ctrl-panel  { width: calc(100vw - 24px); top: 10px; left: 12px; right: 12px; }
    #basin-panel { display: none; }
    #legend      { right: 12px; bottom: 12px; padding: 10px 14px; }
    #gauge-detail { left: 12px; right: 12px; width: auto; bottom: 12px; }
    .leaflet-top.leaflet-right { right: 12px; }
}
@media (max-width: 520px) {
    #ctrl-panel   { top: 8px; left: 8px; right: 8px; }
    #gauge-detail { left: 8px; right: 8px; bottom: 8px; }
    #legend       { right: 8px; bottom: 8px; min-width: 140px; }
    .gd-tube-col  { display: none; }
    #gauge-detail { width: auto; }
}

/* ─── Scrollbar theme ───────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* ─── Action button row ─────────────────────────────────────────────────────── */
.action-btns { display: flex; gap: 5px; }

#locate-btn {
    color: var(--blue);
    border-color: rgba(79,140,255,0.3);
    background: rgba(79,140,255,0.08);
    font-size: 0.95rem;
}
#locate-btn:hover {
    background: rgba(79,140,255,0.18);
    color: #93c5fd;
    border-color: rgba(79,140,255,0.5);
}
#reset-view-btn {
    font-size: 0.9rem;
}

#layer-toggle-btn {
    font-size: 0.78rem;
    color: var(--txt2);
    border-color: rgba(255,255,255,0.12);
    background: rgba(255,255,255,0.04);
    transition: all 0.25s ease;
    white-space: nowrap;
}
#layer-toggle-btn:hover {
    background: rgba(245,158,11,0.12);
    color: #fbbf24;
    border-color: rgba(245,158,11,0.4);
}
#layer-toggle-btn.satellite-active {
    background: rgba(245,158,11,0.15);
    color: #fbbf24;
    border-color: rgba(245,158,11,0.5);
    box-shadow: 0 0 8px rgba(245,158,11,0.25);
}

/* ─── Basin tag (in gauge detail header) ────────────────────────────────────── */
.gd-basin-tag {
    display: inline-flex; align-items: center; gap: 4px;
    margin-top: 5px;
    font-size: 0.7rem; font-weight: 600;
    color: var(--blue);
    background: var(--blue-dim);
    border: 1px solid rgba(79,140,255,0.2);
    padding: 2px 9px 2px 7px;
    border-radius: 20px;
    letter-spacing: 0.1px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 210px;
}

/* ─── Gauge detail title block ──────────────────────────────────────────────── */
.gd-title-block {
    display: flex; flex-direction: column;
    min-width: 0;
}
.gd-title-block h2 {
    font-size: 1.05rem; font-weight: 700;
    letter-spacing: -0.3px; line-height: 1.2;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    max-width: 290px;
}

/* ─── River / station tooltips (Canvas-based) ───────────────────────────────── */
.leaflet-tooltip.river-tooltip {
    background: rgba(6,13,35,0.92) !important;
    border: 1px solid rgba(79,140,255,0.3) !important;
    color: #93c5fd !important;
    font-size: 0.72rem !important;
    font-weight: 600 !important;
    border-radius: 8px !important;
    padding: 4px 10px !important;
    pointer-events: none;
}

/* ─── Gauge detail slide-in animation ───────────────────────────────────────── */
@keyframes gdSlideIn {
    from { opacity: 0; transform: translateY(16px) scale(0.97); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}
#gauge-detail:not(.hidden) { animation: gdSlideIn 0.28s cubic-bezier(0.34, 1.56, 0.64, 1); }

/* ─── Ctrl-body divider lines ───────────────────────────────────────────────── */
.ctrl-divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 0;
}

/* ─── Chart Modal ───────────────────────────────────────────────────────────── */
#chart-modal {
    display: none; /* Hidden by default — shown by JS removing hidden class */
    position: fixed; inset: 0;
    z-index: 9000;
    background: rgba(0,0,0,0.4);
    backdrop-filter: blur(12px) saturate(1.2);
    -webkit-backdrop-filter: blur(12px) saturate(1.2);
    align-items: center; justify-content: center;
    transition: opacity 0.3s ease;
    padding: 24px;
}
#chart-modal:not(.hidden) {
    display: flex; /* Only display when NOT hidden */
}
#chart-modal.hidden {
    display: none !important;
    pointer-events: none;
}
.chart-modal-content {
    background: var(--glass);
    border: 1px solid var(--border-hi);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 100%; max-width: 900px;
    height: 80vh; max-height: 600px;
    display: flex; flex-direction: column;
    animation: modalPop 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}
@keyframes modalPop {
    from { transform: scale(0.95); opacity: 0; }
    to   { transform: scale(1); opacity: 1; }
}
.chart-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    gap: 10px;
}
.chart-title-block {
    display: flex; flex-direction: column; gap: 6px; flex: 1; min-width: 0;
}
.chart-header h3 {
    font-size: 1rem; margin: 0; font-weight: 700; color: var(--txt);
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.chart-range-btns {
    display: flex; gap: 4px;
}
.chart-range-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--txt2);
    cursor: pointer;
    padding: 3px 10px;
    font-size: 0.72rem; font-weight: 600;
    transition: var(--transition);
}
.chart-range-btn:hover { background: var(--blue-dim); color: var(--blue); border-color: var(--blue); }
.chart-range-btn.active { background: var(--blue-dim); color: var(--blue); border-color: var(--blue); }
/* handle in chart modal on desktop */
.chart-handle { display: none; }
.chart-body {
    flex: 1; padding: 16px 20px;
    position: relative;
    min-height: 0;
}
.chart-footer {
    padding: 12px 20px;
    border-top: 1px solid var(--border);
    text-align: right;
    font-size: 0.75rem; color: var(--txt3);
}

/* ─── Responsive Mobile Layout ────────────────────────────────────────────── */
@media (max-width: 768px) {
    /* Control Panel: flush top Apple Maps style */
    #ctrl-panel {
        top: 0; left: 0; right: 0;
        margin-top: 0; width: 100%; max-height: none;
        border-radius: 0 0 32px 32px;
        border-top: none; border-left: none; border-right: none;
        box-shadow: 0 12px 48px rgba(0,0,0,0.25);
    }
    #ctrl-panel .ctrl-header { 
        padding: calc(env(safe-area-inset-top, 12px) + 10px) 20px 14px; 
        align-items: center;
    }
    #ctrl-panel.collapsed .ctrl-header { padding-bottom: 14px; }
    
    #ctrl-body { padding: 0 20px 16px; gap: 14px; }
    
    .app-title { font-size: 1.05rem; font-weight: 800; flex-wrap: nowrap; }
    .subtitle { display: none; }
    
    .stats-row { flex-wrap: nowrap; gap: 10px; }
    .stat-card { 
        flex: 1; min-width: 0; padding: 12px 4px;
        background: var(--glass-light);
        border: 1px solid var(--border-hi);
        border-radius: 18px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    }
    .stat-val { font-size: 1.35rem; font-weight: 800; }
    .stat-label { font-size: 0.65rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; opacity: 0.8; }
    .refresh-row, .view-mode-row { padding: 5px 8px; margin-bottom: 6px; }
    
    /* Basin Panel: float bottom-left to avoid overlap */
    #basin-panel {
        top: auto;
        bottom: calc(env(safe-area-inset-bottom, 10px) + 20px);
        left: 12px;
        right: auto;
        width: auto;
        max-height: 45vh;
        z-index: 900;
        box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    }
    #basin-panel:not(.collapsed) { width: 180px; }
    #basin-panel #basin-body { max-height: 35vh; overflow-y: auto; }

    /* Gauge Details: Bottom Sheet */
    #gauge-detail {
        top: auto;
        bottom: 0; left: 0; right: 0;
        width: 100vw;
        border-radius: 22px 22px 0 0;
        border-left: none; border-right: none; border-bottom: none;
        max-height: 80vh;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        animation: slideUpSheet 0.35s cubic-bezier(0.25, 1, 0.5, 1);
        padding-bottom: env(safe-area-inset-bottom, 12px);
    }
    @keyframes slideUpSheet {
        from { opacity: 0; transform: translateY(60%); }
        to   { opacity: 1; transform: translateY(0); }
    }

    /* Zoom controls: above bottom sheet */
    .leaflet-bottom.leaflet-right {
        bottom: calc(env(safe-area-inset-bottom, 0px) + 16px);
        right: 12px;
    }
    .leaflet-control-zoom a { width: 36px; height: 36px; line-height: 36px; font-size: 1.1rem; }

    /* Bottom sheet drag handle (iOS Style) */
    .mobile-handle {
        display: block;
        width: 36px; height: 5px;
        background: var(--txt3);
        opacity: 0.5;
        border-radius: 3px;
        margin: 10px auto 8px;
        flex-shrink: 0;
    }
    
    /* Touch-optimized buttons */
    .icon-btn, .icon-btn.sm {
        min-height: 42px;
        min-width: 42px;
        padding: 8px 12px;
        font-size: 0.82rem;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    /* Gauge detail body layout */
    .gd-body { flex-direction: column; }
    .gd-tube-col {
        border-right: none;
        border-bottom: 1px solid var(--border);
        justify-content: center;
        padding: 12px 14px;
        width: 100%;
        align-items: center;
        gap: 16px;
    }
    .gd-data { padding: 10px 14px 14px; }
    .gd-row { padding: 6px 0; }

    /* Chart Modal: bottom sheet style */
    #chart-modal { padding: 0; align-items: flex-end; }
    .chart-modal-content {
        height: 90vh;
        max-height: none;
        border-radius: 22px 22px 0 0;
        border-left: none; border-right: none; border-bottom: none;
        animation: slideUpSheet 0.35s cubic-bezier(0.25, 1, 0.5, 1);
        display: flex; flex-direction: column;
        padding-bottom: calc(env(safe-area-inset-bottom, 12px));
    }
    .chart-handle { display: block !important; margin-bottom: 4px; }
    .chart-header { padding: 8px 14px 10px; }
    .chart-header h3 { font-size: 0.92rem; }
    .chart-range-btns { gap: 6px; }
    .chart-range-btn {
        padding: 6px 14px;
        font-size: 0.78rem;
        min-height: 36px;
        border-radius: 8px;
    }
    .chart-body { padding: 6px 10px; flex: 1; min-height: 0; }
    .chart-footer { padding: 6px 12px; font-size: 0.7rem; }
}

/* Extra small phones */
@media (max-width: 400px) {
    #ctrl-panel { left: 4px; right: 4px; }
    .stat-val { font-size: 1.1rem; }
    .app-title { font-size: 0.88rem; }
    .icon-btn, .icon-btn.sm { padding: 8px 8px; font-size: 0.76rem; }
}

@media (min-width: 769px) {
    .mobile-handle { display: none; }
}