/* CSS Variables */
:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-card: #0f3460;
    --text-primary: #eaeaea;
    --text-secondary: #a0a0a0;
    --accent: #e94560;
    --success: #00bf63;
    --warning: #ffa500;
    --error: #ff4444;
    --tdd-low: #00BFFF;
    --tdd-low-mid: #00FF00;
    --tdd-mid: #999999;
    --tdd-hi-mid: #FFA500;
    --tdd-hi: #FF0000;
    --graph-bg: #4ade80;
    --graph-bg-low: #f87171;
    --graph-bg-high: #fbbf24;
    --color-positive: #4ade80;
    --color-neutral: #fbbf24;
    --color-negative: #f87171;
    --graph-basal: #60a5fa;
    --graph-bolus: #f472b6;
    --radius: 8px;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

#app {
    max-width: 600px;
    margin: 0 auto;
    padding: 1rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
#app.loading { visibility: hidden; }

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--bg-secondary);
    margin-bottom: 1rem;
}
header h1 { font-size: 1.5rem; font-weight: 600; }

/* Move header to bottom when dashboard is active */
#app.configured header {
    order: 10;
    border-bottom: none;
    border-top: 1px solid var(--bg-secondary);
    margin-bottom: 0;
    margin-top: 1rem;
}
#app.configured main { order: 1; }
#app.configured footer { order: 9; margin-top: 0; }

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
}
.btn:hover { opacity: 0.9; }
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--accent); color: white; }
.btn-danger { background: var(--error); color: white; }
.btn-link {
    background: none;
    border: none;
    color: var(--accent);
    font-size: 0.875rem;
    cursor: pointer;
    padding: 0.5rem 0;
}
.btn-link:hover { text-decoration: underline; }
.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
}
.icon-btn:hover { background: var(--bg-secondary); }

/* Cards */
.card {
    position: relative;
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}
.card h2 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

/* Loading */
.loading { opacity: 0.6; pointer-events: none; }
.loading::after {
    content: '';
    position: absolute;
    top: 50%; left: 50%;
    width: 24px; height: 24px;
    margin: -12px 0 0 -12px;
    border: 3px solid var(--text-secondary);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Dashboard Layout */
#dashboard { display: flex; flex-direction: column; gap: 1rem; }
.card-row { display: flex; gap: 1rem; min-height: 50px; }
.card-row > .card { flex: 1; margin-bottom: 0; min-width: 0; }
@media (max-width: 600px) { .card-row { flex-direction: column; } }

/* Draggable Cards */
.draggable-card {
    cursor: grab;
    transition: opacity 0.2s, transform 0.2s;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}
.draggable-card:active { cursor: grabbing; }
.draggable-card.dragging { opacity: 0.5; transform: scale(0.98); }
.draggable-card.drag-over-left,
.draggable-card.drag-over-right { position: relative; }
.draggable-card.drag-over-left::before,
.draggable-card.drag-over-right::after {
    content: '';
    position: absolute;
    top: 0; bottom: 0;
    width: 4px;
    background: var(--accent);
    border-radius: 2px;
}
.draggable-card.drag-over-left::before { left: -0.5rem; }
.draggable-card.drag-over-right::after { right: -0.5rem; }

/* Drop Zones */
.card-row.drag-over {
    background: rgba(233, 69, 96, 0.15);
    border-radius: var(--radius);
    outline: 2px dashed var(--accent);
    outline-offset: -2px;
}
.new-row-zone {
    height: 60px;
    border: 2px dashed var(--accent);
    border-radius: var(--radius);
    background: rgba(233, 69, 96, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-size: 0.875rem;
    transition: background 0.15s;
}
.new-row-zone.drag-over { background: rgba(233, 69, 96, 0.25); border-style: solid; }

/* Graph Cards */
.card-graph-panel {
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
}
.card-graph-panel h2 { margin-bottom: 0.5rem; }
.card-graph-panel .graph-container { flex: 1; min-height: 180px; }
@media (min-width: 900px) {
    #app { max-width: 1000px; }
    .card-graph-panel .graph-container { min-height: 220px; }
}
@media (min-width: 1200px) {
    #app { max-width: 1200px; }
    .card-graph-panel .graph-container { min-height: 250px; }
}

/* Graph Styles */
.graph-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.25rem; }
.graph-header h2 { margin-bottom: 0; }
.graph-controls { display: flex; align-items: center; gap: 0.5rem; }
.graph-nav { display: flex; align-items: center; gap: 0.25rem; }
.nav-btn {
    background: var(--bg-secondary);
    border: none;
    color: var(--text-primary);
    width: 28px;
    height: 28px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    justify-content: center;
}
.nav-btn:hover:not(:disabled) { background: var(--accent); }
.nav-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.nav-label {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
    cursor: pointer;
    min-width: 50px;
    text-align: center;
}
.nav-label:hover { color: var(--accent); }
.range-select {
    padding: 0.25rem 0.5rem;
    font-size: 0.7rem;
    border: 1px solid var(--bg-secondary);
    border-radius: var(--radius);
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
}
.graph-container { width: 100%; position: relative; }
.graph-container svg { width: 100%; height: 100%; overflow: visible; }

/* Tooltip */
.graph-tooltip {
    position: absolute;
    padding: 0.5rem 0.75rem;
    background: rgba(0, 0, 0, 0.85);
    color: white;
    border-radius: var(--radius);
    font-size: 0.75rem;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s;
    z-index: 10;
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}
.graph-tooltip.visible { opacity: 1; }
.graph-tooltip .tooltip-time { color: var(--text-secondary); font-size: 0.625rem; margin-bottom: 0.25rem; }
.graph-tooltip .tooltip-value { font-weight: 600; font-size: 0.875rem; }

/* Legend */
.graph-legend { display: flex; justify-content: center; gap: 1rem; margin-top: 0.25rem; font-size: 0.7rem; color: var(--text-secondary); }
.legend-item { display: flex; align-items: center; gap: 0.375rem; }
.legend-line { width: 16px; height: 2px; }
.legend-line.basal { background: var(--graph-basal); }
.legend-line.total { background: var(--graph-bolus); }
.legend-line.bg { background: var(--graph-bg); }

/* Graph Elements */
.bg-line, .tdd-line { fill: none; stroke-width: 2; }
.bg-line { stroke-linecap: round; stroke-linejoin: round; }
.bg-dot { cursor: pointer; transition: r 0.15s; }
.bg-dot:hover { r: 6; }
.bg-zone { opacity: 0.08; }
.bg-zone.low { fill: var(--error); }
.bg-zone.high { fill: var(--warning); }
.now-line { stroke: var(--accent); stroke-width: 1; stroke-dasharray: 4, 4; opacity: 0.6; }
.avg-line { fill: none; stroke: var(--text-secondary); stroke-width: 1.5; stroke-dasharray: 4, 4; }

/* Axes */
.axis text { fill: var(--text-secondary); font-size: 0.625rem; }
.axis line, .axis path { stroke: var(--bg-secondary); }
.axis-right text { fill: var(--graph-bg); }
.grid line { stroke: var(--bg-secondary); stroke-opacity: 0.5; stroke-dasharray: 2, 2; }
.grid path { stroke-width: 0; }

/* Stats Header (TDD + BG combined) */
.stats-header { display: flex; justify-content: space-between; gap: 1rem; }
.tdd-section, .bg-section { flex: 1; }
.bg-section { text-align: right; }

/* BG Display */
.bg-display { display: flex; align-items: baseline; gap: 0.5rem; }
.bg-section .bg-display { justify-content: flex-end; }
#bg-value { font-size: 2.5rem; font-weight: 700; line-height: 1; }
#bg-trend { font-size: 1.5rem; }

/* TDD Display */
.tdd-display { display: flex; align-items: baseline; gap: 0.25rem; }
#tdd-current { font-size: 2.5rem; font-weight: 700; line-height: 1; }
.tdd-display .unit { font-size: 1.25rem; color: var(--text-secondary); }
.tdd-percentage { font-size: 1.25rem; font-weight: 600; margin-left: 0.5rem; padding: 0.125rem 0.5rem; border-radius: 4px; }
.tdd-details { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--bg-secondary); }
.tdd-row { display: flex; justify-content: space-between; padding: 0.25rem 0; font-size: 0.875rem; }
.tdd-row span:first-child { color: var(--text-secondary); }
.tdd-breakdown { display: flex; gap: 1rem; margin-top: 0.5rem; font-size: 0.875rem; color: var(--text-secondary); }
.tdd-change { font-size: 0.75rem; }
.tdd-change.up { color: var(--warning); }
.tdd-change.down { color: var(--success); }

/* Meta */
.meta { font-size: 0.875rem; color: var(--text-secondary); margin-top: 0.5rem; }

/* Settings Panel */
.panel {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    z-index: 100;
    padding: 1rem;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}
#settings-panel { display: flex; flex-direction: column; align-items: center; }
#settings-panel > * { width: 100%; max-width: 500px; }
.panel-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; padding-bottom: 1rem; border-bottom: 1px solid var(--bg-secondary); }
.panel-header h2 { font-size: 1.25rem; }
.panel-header .icon-btn { font-size: 1.5rem; }

/* Forms */
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 0.5rem; }
.form-group input, .form-group select {
    width: 100%;
    padding: 0.75rem;
    font-size: 16px; /* Prevents iOS zoom on focus */
    border: 1px solid var(--bg-secondary);
    border-radius: var(--radius);
    background: var(--bg-secondary);
    color: var(--text-primary);
    -webkit-user-select: text;
    user-select: text;
    touch-action: manipulation;
    -webkit-appearance: none;
    appearance: none;
}
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--accent); }
.form-group input::placeholder { color: var(--text-secondary); }
.input-with-toggle { position: relative; display: flex; }
.input-with-toggle input { flex: 1; padding-right: 2.75rem; }
.toggle-visibility {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    display: flex;
}
.toggle-visibility:hover { color: var(--text-primary); }
.form-actions { margin-top: 1.5rem; }
.form-actions .btn { width: 100%; }
.settings-section { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--bg-secondary); }
.settings-section h3 { font-size: 1rem; margin-bottom: 0.5rem; }
.settings-section .meta { margin-bottom: 1rem; }

/* Status Bar */
#status-bar {
    margin-top: auto;
    padding: 0.75rem 0;
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
    border-top: 1px solid var(--bg-secondary);
}
#connection-status { display: flex; align-items: center; gap: 0.5rem; }
.status-indicator { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.status-indicator.online { background: var(--success); box-shadow: 0 0 4px var(--success); }
.status-indicator.offline { background: var(--error); }
.status-indicator.connecting { background: var(--warning); animation: pulse 1s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }

/* Utilities */
.hidden { display: none !important; }
.stale #bg-value, .stale #bg-trend, .stale #bg-age { color: var(--error); }
.stale.card { border: 2px solid var(--error); }
main { flex: 1; }
#setup-prompt { text-align: center; padding: 2rem; }
#setup-prompt h2 { font-size: 1.5rem; color: var(--text-primary); text-transform: none; letter-spacing: normal; margin-bottom: 0.5rem; }
#setup-prompt p { color: var(--text-secondary); margin-bottom: 1.5rem; }

/* Header Actions */
.header-actions { display: flex; gap: 0.5rem; }