:root {
    --bg: #f6f1e8;
    --panel: rgba(255, 251, 244, 0.9);
    --panel-border: rgba(94, 78, 57, 0.14);
    --text: #201a14;
    --muted: #6f6559;
    --accent: #cd5c3f;
    --accent-dark: #9e4027;
    --shadow: 0 20px 50px rgba(57, 42, 24, 0.12);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Yu Gothic UI", "Hiragino Sans", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(205, 92, 63, 0.12), transparent 30%),
        radial-gradient(circle at bottom right, rgba(22, 124, 97, 0.12), transparent 28%),
        linear-gradient(180deg, #fbf7ef 0%, var(--bg) 100%);
}

.app-shell {
    width: min(1400px, calc(100vw - 32px));
    margin: 16px auto 24px;
}

.hero,
.panel {
    backdrop-filter: blur(10px);
    background: var(--panel);
    border: 1px solid var(--panel-border);
    border-radius: 24px;
    box-shadow: var(--shadow);
}

.hero {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 22px;
    align-items: end;
}

.eyebrow {
    margin: 0 0 4px;
    color: var(--accent-dark);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.hero h1 {
    margin: 0;
    font-size: clamp(1.3rem, 2.8vw, 1.9rem);
    line-height: 1.1;
}

.hero-copy {
    margin: 6px 0 0;
    max-width: 760px;
    color: var(--muted);
    font-size: 0.88rem;
    line-height: 1.5;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.panel {
    margin-top: 12px;
}

.controls {
    display: grid;
    grid-template-columns: repeat(6, minmax(150px, 1fr));
    gap: 12px;
    align-items: center;
    padding: 14px 16px;
}

.field {
    display: grid;
    gap: 5px;
    font-weight: 700;
}

.field span,
.toggle span {
    font-size: 0.8rem;
}

input[type="number"] {
    width: 100%;
    border: 1px solid rgba(94, 78, 57, 0.18);
    background: rgba(255, 255, 255, 0.95);
    border-radius: 10px;
    padding: 7px 10px;
    font-size: 0.9rem;
    color: var(--text);
}

select {
    width: 100%;
    border: 1px solid rgba(94, 78, 57, 0.18);
    background: rgba(255, 255, 255, 0.95);
    border-radius: 10px;
    padding: 7px 10px;
    font-size: 0.9rem;
    color: var(--text);
}

.select-field {
    min-width: 190px;
}

.ma-period-field {
    width: 90px;
}

.color-field input[type="color"] {
    width: 100%;
    height: 32px;
    border: 1px solid rgba(94, 78, 57, 0.18);
    background: rgba(255, 255, 255, 0.95);
    border-radius: 14px;
    padding: 6px;
    cursor: pointer;
}

.toggle {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    user-select: none;
}

.toggle input {
    width: 20px;
    height: 20px;
    accent-color: var(--accent);
}

.control-break {
    grid-column: 1 / -1;
    height: 0;
}

.tips {
    grid-column: span 2;
    color: var(--muted);
    font-size: 0.8rem;
    line-height: 1.45;
}

.tips p {
    margin: 2px 0;
}

.toolbar {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 12px 16px;
}

.tool-group {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.group-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--muted);
    min-width: 84px;
}

.tool-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.mode-button {
    background: rgba(94, 78, 57, 0.1);
    color: var(--text);
}

.mode-button.active {
    background: var(--accent);
    color: #fffaf7;
}

.template-button {
    background: rgba(22, 124, 97, 0.12);
    color: var(--text);
}

.annotation-tools .annotation-color {
    width: 96px;
}

.object-actions {
    align-items: center;
}

.object-actions .annotation-color {
    width: 96px;
}

.canvas-panel {
    padding: 12px 12px 14px;
}

.quiz-panel {
    border-color: rgba(205, 92, 63, 0.35);
}

.quiz-choices {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}

.quiz-choice {
    background: rgba(47, 107, 216, 0.12);
    color: var(--text);
    min-width: 140px;
}

.quiz-choice.correct {
    background: #1d9a6c;
    color: #ffffff;
}

.quiz-choice.wrong {
    background: #cf4b42;
    color: #ffffff;
}

.quiz-choice:disabled {
    cursor: default;
    opacity: 0.85;
}

button.hidden {
    display: none;
}

button:disabled {
    opacity: 0.4;
    cursor: default;
    transform: none;
}

.canvas-header {
    padding: 2px 4px 8px;
}

.canvas-header h2 {
    margin: 0;
    font-size: 0.95rem;
}

.canvas-header p {
    margin: 3px 0 0;
    color: var(--muted);
    font-size: 0.85rem;
}

.edit-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin: 0 6px 10px;
    padding: 10px 12px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(94, 78, 57, 0.12);
}

.edit-panel.hidden {
    display: none;
}

.edit-copy strong,
.edit-copy span {
    display: block;
}

.edit-copy span {
    margin-top: 4px;
    color: var(--muted);
    font-size: 0.92rem;
}

.edit-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: stretch;
}

.edit-stack {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.edit-stack button {
    min-width: 120px;
}

.edit-stack-actions {
    justify-content: center;
}

.canvas-wrap {
    position: relative;
    border-radius: 22px;
    overflow: hidden;
    border: 1px solid rgba(94, 78, 57, 0.14);
    background: linear-gradient(180deg, #fffdf9 0%, #f8f2ea 100%);
}

canvas {
    display: block;
    width: 100%;
    height: min(70vh, 636px);
    touch-action: none;
    cursor: crosshair;
}

.empty-overlay {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    pointer-events: none;
    color: var(--muted);
    text-align: center;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.06));
}

.empty-overlay strong,
.empty-overlay span {
    display: block;
}

.empty-overlay strong {
    font-size: 1.2rem;
    color: var(--text);
    margin-bottom: 8px;
}

button {
    border: 0;
    border-radius: 999px;
    padding: 8px 14px;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.16s ease, opacity 0.16s ease, background-color 0.16s ease;
}

button:hover {
    transform: translateY(-1px);
}

button.primary {
    background: var(--accent);
    color: #fffaf7;
}

button.secondary {
    background: rgba(94, 78, 57, 0.1);
    color: var(--text);
}

button:active {
    transform: translateY(0);
}

@media (max-width: 1100px) {
    .controls {
        grid-template-columns: repeat(3, minmax(160px, 1fr));
    }

    .tips {
        grid-column: span 3;
    }
}

@media (max-width: 860px) {
    .hero {
        align-items: start;
        flex-direction: column;
    }

    .controls {
        grid-template-columns: 1fr;
    }

    .tips {
        grid-column: span 1;
    }

    .hero-actions {
        width: 100%;
    }

    .hero-actions button {
        flex: 1 1 auto;
    }

    .edit-panel {
        flex-direction: column;
        align-items: flex-start;
    }

    .edit-actions {
        width: 100%;
    }

    .edit-stack,
    .edit-stack-actions {
        width: 100%;
    }

    .edit-stack button {
        width: 100%;
    }
}