@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;500;600;700&display=swap');

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

:root {
    --ocean-deep: #0c2d48;
    --ocean-mid: #145374;
    --ocean-light: #1a6fa0;
    --ocean-foam: #5fbdce;
    --ocean-sky: #a8dadc;
    --sand-light: #f5efe6;
    --sand-warm: #e8dcc8;
    --sand-dark: #c9b99a;
    --kelp-green: #4a7c59;
    --kelp-light: #6da67a;
    --coral: #e07a5f;
    --coral-light: #f2a68b;
    --sunset: #f4845f;
    --driftwood: #8b7355;
    --seafoam-glass: rgba(95, 189, 206, 0.12);
    --text-dark: #1a3040;
    --text-mid: #3d5a6e;
    --text-light: #7a9aad;
}

body {
    font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(180deg, #dceef5 0%, #e8dcc8 100%);
    background-attachment: fixed;
    color: var(--text-dark);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent;
}

header {
    background: linear-gradient(135deg, var(--ocean-deep) 0%, var(--ocean-mid) 100%);
    border-bottom: 3px solid var(--ocean-foam);
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
    box-shadow: 0 2px 12px rgba(12, 45, 72, 0.3);
}

header h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--sand-light);
    letter-spacing: 0.3px;
    text-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.mode-toggle {
    display: flex;
    background: rgba(0,0,0,0.2);
    border-radius: 10px;
    padding: 3px;
    gap: 2px;
}

.mode-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.25s;
    background: transparent;
    color: var(--ocean-sky);
    min-height: 44px;
}

.mode-btn.active {
    background: var(--ocean-foam);
    color: var(--ocean-deep);
    box-shadow: 0 2px 8px rgba(95, 189, 206, 0.3);
}

.mode-btn:hover:not(.active) {
    color: white;
    background: rgba(255,255,255,0.1);
}

nav.image-tabs {
    display: flex;
    gap: 6px;
    padding: 12px 20px;
    background: linear-gradient(135deg, var(--ocean-mid) 0%, var(--ocean-light) 100%);
    border-bottom: 2px solid var(--ocean-foam);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.tab {
    padding: 12px 20px;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 10px;
    background: rgba(255,255,255,0.08);
    color: var(--ocean-sky);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.25s;
    white-space: nowrap;
    min-height: 44px;
}

.tab:hover {
    background: rgba(255,255,255,0.15);
    color: white;
}

.tab.active {
    background: var(--sand-light);
    color: var(--ocean-deep);
    border-color: var(--sand-warm);
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

main {
    padding: 16px;
}

.workspace {
    display: flex;
    gap: 16px;
    max-width: 1400px;
    margin: 0 auto;
}

/* ---- Zoom Viewport ---- */
.image-viewport {
    flex: 1;
    position: relative;
    background: white;
    border-radius: 14px;
    border: 2px solid var(--sand-dark);
    overflow: hidden;
    min-height: 300px;
    box-shadow: 0 4px 20px rgba(12, 45, 72, 0.12);
}

.image-container {
    position: relative;
    transform-origin: 0 0;
    cursor: crosshair;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 100%;
    min-height: 300px;
    transition: none;
}

.image-container img {
    max-width: 100%;
    display: block;
    user-select: none;
    -webkit-user-drag: none;
    pointer-events: none;
}

/* Zoom controls */
.zoom-controls {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 50;
    display: flex;
    align-items: center;
    gap: 4px;
    background: rgba(12, 45, 72, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 10px;
    padding: 4px 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.zoom-btn {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 8px;
    background: rgba(255,255,255,0.12);
    color: var(--sand-light);
    font-size: 1.1rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
    min-height: 36px;
}

.zoom-btn:hover {
    background: rgba(255,255,255,0.25);
}

.zoom-btn:active {
    transform: scale(0.92);
}

.zoom-btn.zoom-fit {
    font-size: 0.7rem;
    font-weight: 700;
    width: auto;
    padding: 0 10px;
}

.zoom-level {
    color: var(--ocean-sky);
    font-size: 0.75rem;
    font-weight: 600;
    min-width: 38px;
    text-align: center;
}

/* Panning cursor */
.image-viewport.panning .image-container {
    cursor: grabbing;
}

.image-viewport.zoomed .image-container {
    cursor: grab;
}

/* SVG lines layer */
#lines-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 8;
}

#markers-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

/* ---- Marker Dots ---- */
.marker-dot {
    position: absolute;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #ff6600;
    border: 2px solid #1a1a1a;
    box-shadow: 0 0 6px rgba(255, 102, 0, 0.6);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0;
    color: white;
    transform: translate(-50%, -50%);
    z-index: 10;
    pointer-events: auto;
    -webkit-touch-callout: none;
    transition: transform 0.15s, background 0.15s;
}

/* Invisible expanded touch target */
.marker-dot::after {
    content: '';
    position: absolute;
    width: 44px;
    height: 44px;
    border-radius: 50%;
}

.marker-dot:hover {
    transform: translate(-50%, -50%) scale(1.3);
}

.marker-dot.dot-correct {
    background: var(--kelp-green);
}

.marker-dot.dot-incorrect {
    background: var(--coral);
}

/* ---- Marker Labels ---- */
.marker-label {
    position: absolute;
    transform: translate(-50%, -50%);
    background: var(--sand-light);
    border: 2px solid var(--ocean-light);
    color: var(--text-dark);
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 600;
    white-space: nowrap;
    min-width: 44px;
    text-align: center;
    min-height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 11;
    pointer-events: auto;
    cursor: grab;
    user-select: none;
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}

.marker-label.empty {
    border-style: dashed;
    border-color: var(--sand-dark);
    color: var(--text-light);
    min-width: 90px;
    background: rgba(255,255,255,0.7);
}

.marker-label.drop-hover {
    border-color: var(--kelp-green);
    background: #e8f5e9;
    border-style: solid;
}

.marker-label.correct {
    border-color: var(--kelp-green);
    background: #e8f5e9;
    color: #2d5a3d;
}

.marker-label.incorrect {
    border-color: var(--coral);
    background: #fce8e3;
    color: #8b3a2a;
}

.marker-label.label-dragging {
    cursor: grabbing;
    opacity: 0.85;
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

/* ---- Delete Button ---- */
.marker-delete {
    position: absolute;
    transform: translate(-50%, -50%);
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--coral);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 20;
    pointer-events: auto;
    border: 2px solid white;
    line-height: 1;
    touch-action: manipulation;
    box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

.marker-delete:active {
    transform: translate(-50%, -50%) scale(0.9);
    background: #c0594a;
}

/* ---- Sidebar ---- */
.sidebar {
    width: 320px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.instructions {
    background: white;
    border: 1px solid var(--sand-dark);
    border-radius: 12px;
    padding: 14px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.instructions h3 {
    font-size: 0.95rem;
    margin-bottom: 6px;
    color: var(--ocean-mid);
}

.instructions p {
    font-size: 0.82rem;
    line-height: 1.7;
    color: var(--text-mid);
}

.word-bank {
    background: white;
    border: 1px solid var(--sand-dark);
    border-radius: 12px;
    padding: 14px;
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.word-bank h3 {
    font-size: 0.95rem;
    margin-bottom: 10px;
    color: var(--ocean-mid);
}

#word-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.word-chip {
    padding: 10px 14px;
    background: var(--sand-light);
    border: 1px solid var(--sand-dark);
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: grab;
    transition: all 0.2s;
    user-select: none;
    color: var(--text-dark);
    min-height: 44px;
    display: flex;
    align-items: center;
}

.word-chip:hover {
    background: var(--ocean-foam);
    border-color: var(--ocean-light);
    color: var(--ocean-deep);
    box-shadow: 0 2px 6px rgba(95, 189, 206, 0.25);
}

.word-chip:active {
    transform: scale(0.96);
}

.word-chip.used {
    opacity: 0.3;
    cursor: default;
    pointer-events: none;
}

.word-chip.dragging {
    opacity: 0.4;
}

.word-chip.selected {
    background: var(--ocean-light);
    border-color: var(--ocean-foam);
    color: white;
    box-shadow: 0 0 0 3px rgba(26, 111, 160, 0.25);
}

/* Touch drag ghost */
.touch-ghost {
    position: fixed;
    padding: 10px 14px;
    background: var(--ocean-light);
    border: 2px solid var(--ocean-foam);
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    color: white;
    pointer-events: none;
    z-index: 9999;
    box-shadow: 0 8px 24px rgba(12, 45, 72, 0.3);
    transform: rotate(-2deg);
    white-space: nowrap;
}

/* ---- Buttons ---- */
.actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.action-btn {
    padding: 14px;
    border: none;
    border-radius: 10px;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    min-height: 48px;
    letter-spacing: 0.3px;
}

.action-btn:active {
    transform: scale(0.97);
}

.save-btn {
    background: linear-gradient(135deg, var(--kelp-green), var(--kelp-light));
    color: white;
    box-shadow: 0 2px 8px rgba(74, 124, 89, 0.3);
}
.save-btn:hover {
    box-shadow: 0 4px 12px rgba(74, 124, 89, 0.4);
}

.submit-btn {
    background: linear-gradient(135deg, var(--ocean-mid), var(--ocean-light));
    color: white;
    box-shadow: 0 2px 8px rgba(20, 83, 116, 0.3);
}
.submit-btn:hover {
    box-shadow: 0 4px 12px rgba(20, 83, 116, 0.4);
}

.reset-btn {
    background: var(--sand-warm);
    color: var(--driftwood);
    border: 1px solid var(--sand-dark);
}
.reset-btn:hover {
    background: var(--sand-dark);
    color: var(--text-dark);
}

.data-btn {
    background: linear-gradient(135deg, var(--coral), var(--sunset));
    color: white;
    box-shadow: 0 2px 8px rgba(224, 122, 95, 0.3);
}
.data-btn:hover {
    box-shadow: 0 4px 12px rgba(224, 122, 95, 0.4);
}

/* ---- Results ---- */
.results {
    background: white;
    border: 1px solid var(--sand-dark);
    border-radius: 12px;
    padding: 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.results h3 {
    margin-bottom: 8px;
    color: var(--ocean-mid);
}

.results .score {
    font-size: 2.2rem;
    font-weight: 700;
    text-align: center;
    margin: 12px 0;
}

.results .score.perfect { color: var(--kelp-green); }
.results .score.good { color: var(--driftwood); }
.results .score.poor { color: var(--coral); }

.results .detail {
    font-size: 0.82rem;
    color: var(--text-mid);
    margin-top: 4px;
}

.results .wrong-item {
    padding: 6px 0;
    border-bottom: 1px solid var(--sand-warm);
    font-size: 0.85rem;
    color: var(--text-dark);
}

.results .wrong-item:last-child { border-bottom: none; }

/* ---- Toast ---- */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--ocean-deep);
    border: 2px solid var(--ocean-foam);
    color: var(--sand-light);
    padding: 14px 24px;
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: transform 0.3s ease;
    z-index: 1000;
    box-shadow: 0 8px 24px rgba(12, 45, 72, 0.4);
    max-width: 90vw;
    text-align: center;
}

.toast.show { transform: translateX(-50%) translateY(0); }
.toast.success { border-color: var(--kelp-light); }
.toast.error { border-color: var(--coral); }

/* Student mode — FIX #5: higher specificity to override .zoomed cursor */
.student-mode .image-viewport .image-container { cursor: default; }
.student-mode .image-viewport.zoomed .image-container { cursor: grab; }
.student-mode .image-viewport.panning .image-container { cursor: grabbing; }

/* ---- Responsive ---- */
@media (max-width: 900px) {
    .workspace { flex-direction: column; }
    .sidebar { width: 100%; }
    .word-bank { max-height: 40vh; }
}

@media (max-width: 600px) {
    header { padding: 10px 12px; }
    header h1 { font-size: 1rem; width: 100%; }
    nav.image-tabs { padding: 8px 12px; gap: 4px; }
    .tab { padding: 10px 14px; font-size: 0.82rem; }
    main { padding: 10px; }
    .image-container { min-height: 250px; }
    .marker-dot { width: 8px; height: 8px; }
    .marker-label { font-size: 0.75rem; padding: 5px 8px; }
    .word-chip { padding: 8px 10px; font-size: 0.8rem; }
    .sidebar { gap: 8px; }
}