.my-online-ruler-container {
    text-align: center;
    margin: 20px auto;
    max-width: 100%;
    overflow: hidden;
}

/* THEME TOKENS */
.my-online-ruler-container {
    --ruler-bg: linear-gradient(90deg, #f3e2c7, #e9d4b3);
    --ruler-grain: repeating-linear-gradient(90deg, rgba(139,104,58,0.15) 0, rgba(139,104,58,0.15) 4px, rgba(0,0,0,0) 4px, rgba(0,0,0,0) 12px);
    --ruler-border: #8B6B3E;
    --mark: #222;
    --submark: #333;
    --label: #222;
}
.my-online-ruler-container.theme-light { --ruler-bg:#fff; --ruler-grain:none; --ruler-border:#d9d9d9; --mark:#222; --submark:#444; --label:#222; }
.my-online-ruler-container.theme-dark { --ruler-bg:#1e1f22; --ruler-grain:none; --ruler-border:#444; --mark:#e6e6e6; --submark:#c0c0c0; --label:#f0f0f0; }
.my-online-ruler-container.theme-steel { --ruler-bg:linear-gradient(180deg,#eef2f5,#dde5ec); --ruler-grain:repeating-linear-gradient(90deg, rgba(160,175,189,0.14) 0, rgba(160,175,189,0.14) 6px, rgba(0,0,0,0) 6px, rgba(0,0,0,0) 14px); --ruler-border:#9aa8b6; --mark:#29323a; --submark:#435160; --label:#29323a; }

.ruler-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    justify-content: center;
    margin-bottom: 10px;
}

.ruler-btn {
    padding: 6px 10px;
    border: 1px solid #bbb;
    background: #fff;
    border-radius: 4px;
    cursor: pointer;
}

.ruler-select {
    padding: 6px 8px;
    border: 1px solid #bbb;
    border-radius: 4px;
}

.ruler-toggle {
    display: inline-flex;
    gap: 6px;
    align-items: center;
}

#my-online-ruler {
    background: var(--ruler-bg);
    background-image: var(--ruler-grain);
    border: 2px solid var(--ruler-border);
    padding: 12px 0 22px; /* space for labels */
    position: relative;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
    font-family: Arial, sans-serif;
    user-select: none;
    width: 100%;
    min-height: 64px;
}

/* Grid and guides */
.ruler-grid { position: absolute; inset: 0; pointer-events: none; z-index: 1; background-image: linear-gradient(90deg, rgba(0,0,0,0.06) 1px, transparent 1px); background-size: 10px 100%; display: none; }
.grid-on .ruler-grid { display: block; }
.center-guide-line, .edge-guide-line { position: absolute; top: 0; bottom: 0; width: 1px; background: rgba(0,0,0,0.25); z-index: 2; display: none; }
.center-guide-on .center-guide-line { display: block; }
.edge-guides-on .edge-guide-line { display: block; }
.edge-guide-line.left { left: 0; }
.edge-guide-line.right { right: 0; }

/* Magnifier */
.loupe { position: absolute; width: 140px; height: 80px; border: 2px solid rgba(0,0,0,0.3); border-radius: 8px; background: rgba(255,255,255,0.95); overflow: hidden; display: none; z-index: 10; box-shadow: 0 6px 24px rgba(0,0,0,0.18); }
.loupe-inner { position: absolute; transform-origin: top left; }
.loupe-on .loupe { display: block; }

.my-online-ruler-container:fullscreen {
    background: #faf8f3;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

.my-online-ruler-container:fullscreen #my-online-ruler {
    margin-bottom: 64px; /* leave space for toolbar at bottom */
}

.my-online-ruler-container:fullscreen .ruler-toolbar {
    position: fixed;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255,255,255,0.9);
    border: 1px solid #ddd;
    border-radius: 10px;
    padding: 6px 10px;
    z-index: 5;
    backdrop-filter: blur(4px);
}

/* Auto-hide toolbar in fullscreen */
.my-online-ruler-container:fullscreen .ruler-toolbar { opacity: 0; transition: opacity 150ms ease-in-out; }
.my-online-ruler-container:fullscreen .ruler-toolbar.show { opacity: 1; }

.ruler-track {
    position: relative;
    width: 100%;
    height: 36px;
}

.ruler-mark {
    position: absolute;
    height: 100%;
    width: 1px;
    background-color: var(--mark);
    top: 0;
}

.ruler-number {
    position: absolute;
    bottom: -18px;
    transform: translateX(-50%);
    font-size: 12px;
    font-weight: bold;
    color: var(--label);
    line-height: 1;
    padding: 0 3px;
    background: rgba(255,255,255,0.65);
    border-radius: 3px;
}

.ruler-submark {
    position: absolute;
    height: 50%;
    width: 1px;
    background-color: var(--submark);
    top: 50%;
}

.ruler-row {
    position: relative;
    height: 18px;
}

.ruler-row.inch .ruler-number { color: #333; }
.ruler-row.cm .ruler-number { color: #444; }
/* Offset rows slightly to avoid touching */
.ruler-row.inch { margin-bottom: 6px; }
.ruler-row.cm { margin-top: 6px; }

.ruler-calibration {
    margin-top: 15px;
    padding: 10px;
    background: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 5px;
}

/* Calibration overlay */
.or-cal-overlay {
    position: absolute;
    inset: 0;
    pointer-events: auto;
    background: transparent;
    z-index: 4;
}
.or-cal-bar {
    position: absolute;
    left: 50%;
    top: 6px;
    height: 10px;
    transform: translateX(-50%);
    background: rgba(30, 136, 229, 0.25);
    border: 2px solid rgba(30, 136, 229, 0.6);
    border-radius: 6px;
}
.or-cal-handle {
    position: absolute;
    right: -8px;
    top: -6px;
    width: 16px;
    height: 22px;
    background: #1e88e5;
    border-radius: 4px;
    cursor: ew-resize;
}
.or-cal-tip {
    position: absolute;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255,255,255,0.95);
    border: 1px solid #ccc;
    border-radius: 6px;
    padding: 4px 8px;
    font-size: 12px;
    color: #333;
}

.ruler-calibration input[type="range"] {
    width: 200px;
    vertical-align: middle;
    margin: 0 10px;
}

.ruler-info {
    margin-top: 10px;
    font-size: 14px;
    color: #666;
}

/* Onboarding */
.onboard.hidden { display: none; }
.onboard {
    position: fixed;
    left: 0; right: 0; bottom: 18px;
    display: flex; justify-content: center; z-index: 20;
}
.onboard-card {
    background: #fff; border: 1px solid #ddd; border-radius: 10px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
    padding: 12px 16px; max-width: 520px; text-align: left;
}
.onboard-card h4 { margin: 0 0 8px 0; }
.onboard-card ol { margin: 0 0 10px 18px; }

/* Help modal */
.ruler-modal.hidden { display: none; }
.ruler-modal { position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 30; display: flex; align-items: center; justify-content: center; }
.ruler-modal-dialog { background: #fff; border-radius: 12px; padding: 16px 18px; width: min(560px, 92vw); border: 1px solid #ddd; }
.ruler-modal .modal-close { position: absolute; margin-left: calc(min(560px, 92vw) / 2 - 12px); margin-top: -8px; background: #fff; border: 1px solid #ddd; border-radius: 50%; width: 24px; height: 24px; cursor: pointer; }
.help-list { padding-left: 18px; }

/* Crosshair + readout */
.ruler-crosshair {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 1px;
    background: rgba(30, 136, 229, 0.7);
    pointer-events: none;
    z-index: 6;
}
.ruler-readout {
    position: absolute;
    top: -26px;
    transform: translateX(-50%);
    background: rgba(255,255,255,0.95);
    border: 1px solid #ddd;
    border-radius: 6px;
    padding: 2px 6px;
    font-size: 12px;
    color: var(--label);
    white-space: nowrap;
    pointer-events: none;
    z-index: 7;
}

/* Zero handle */
.zero-handle {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 3px;
    background: rgba(0,0,0,0.35);
    cursor: ew-resize;
    z-index: 5;
}
.zero-handle::after {
    content: '0';
    position: absolute;
    top: -22px;
    left: 50%;
    transform: translateX(-50%);
    font-weight: 700;
    background: rgba(255,255,255,0.9);
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 0 4px;
    font-size: 12px;
    color: var(--label);
}

/* Pins */
.ruler-pin {
    position: absolute;
    top: 0;
    height: 100%;
    width: 2px;
    background: #e53935;
    z-index: 6;
}
.ruler-pin .lbl {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255,255,255,0.95);
    border: 1px solid #e53935;
    border-radius: 6px;
    padding: 1px 6px;
    font-size: 12px;
    color: #e53935;
    white-space: nowrap;
}

/* Vertical orientation */
.my-online-ruler-container.vertical #my-online-ruler {
    height: 70vh;
    width: auto;
}
.my-online-ruler-container.vertical .ruler-track {
    height: 100%;
    width: 36px;
}
.my-online-ruler-container.vertical .ruler-row {
    writing-mode: vertical-rl;
    height: 100%;
}
.my-online-ruler-container.vertical .ruler-number {
    bottom: auto;
    right: -18px;
    transform: translateY(50%) rotate(90deg);
}

/* Print - hide UI and give clean background */
@media print {
    .ruler-toolbar,
    .ruler-calibration,
    .ruler-info { display: none !important; }
    body { background: #fff !important; }
    #my-online-ruler { box-shadow: none !important; border-color: #bbb; }
}