/* CSS Variables for design system */
:root {
    --bg-main: #0a0c10;
    --bg-panel: rgba(20, 24, 33, 0.75);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(0, 242, 254, 0.25);
    
    --text-primary: #f5f6fa;
    --text-secondary: #a0a8c0;
    --text-muted: #606880;

    --neon-blue: #00f2fe;
    --neon-purple: #9b59b6;
    --neon-green: #2ecc71;
    --neon-red: #ff4757;
    --neon-orange: #ffa502;
    --neon-pink: #ff2a85;
    
    /* Atom Colors */
    --color-c: #bdc3c7;      /* Carbon: Silver/Gray */
    --color-o: #ff4757;      /* Oxygen: Red */
    --color-n: #3e81f7;      /* Nitrogen: Blue */
    --color-cl: #2ecc71;     /* Chlorine: Green */
    --color-s: #f1c40f;      /* Sulfur: Yellow */
    --color-br: #a85d00;     /* Bromine: Dark Orange-Brown */
    --color-h: #718093;      /* Hydrogen: Slate/Gray */
    
    --font-main: 'Noto Sans JP', sans-serif;
    --font-code: 'Orbitron', sans-serif;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-main);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

/* App Container Layout */
#app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

header {
    background: rgba(10, 12, 16, 0.9);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 50px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.logo {
    font-family: var(--font-code);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--neon-blue);
    text-shadow: 0 0 10px rgba(0, 242, 254, 0.6);
}

.version {
    font-family: var(--font-code);
    font-size: 12px;
    color: var(--text-muted);
}

main {
    display: flex;
    flex: 1;
    height: calc(100vh - 50px);
    padding: 15px;
    gap: 15px;
}

/* Panels styling */
.glass-panel {
    background: var(--bg-panel);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

#left-panel {
    width: 280px;
    flex-shrink: 0;
    overflow-y: auto;
}

#right-panel {
    width: 320px;
    flex-shrink: 0;
    overflow-y: auto;
}

/* モード切替タブ（P10 M1） */
#mode-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 12px;
}
.mode-tab {
    flex: 1;
    padding: 8px 4px;
    font-size: 12.5px;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
}
.mode-tab:hover {
    background: rgba(255, 255, 255, 0.09);
    color: #fff;
}
.mode-tab.active {
    color: #061018;
    background: var(--color-cyan, #00f2fe);
    border-color: var(--color-cyan, #00f2fe);
    font-weight: 700;
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.5);
}

#canvas-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: #07090c;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 0 40px rgba(0,0,0,0.8);
}

/* Panel Typography */
h2 {
    font-family: var(--font-code);
    font-size: 18px;
    font-weight: 700;
    color: var(--neon-blue);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 8px;
    letter-spacing: 1px;
}

.tool-group h3 {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 700;
}

/* Buttons Styles */
.grid-buttons {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

button {
    font-family: var(--font-main);
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 14px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: left;
}

button:hover {
    background: rgba(255,255,255,0.08);
    border-color: var(--text-secondary);
}

.tool-btn.active, .bond-btn.active {
    background: rgba(0, 242, 254, 0.1);
    border-color: var(--neon-blue);
    color: var(--neon-blue);
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.2);
}

/* Atom Palette Buttons */
.atom-palette {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.atom-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: bold;
}

.atom-btn span {
    font-family: var(--font-code);
    font-size: 18px;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(0,0,0,0.3);
}

.atom-c.active { border-color: var(--color-c); color: var(--color-c); background: rgba(189,195,199,0.1); }
.atom-o.active { border-color: var(--color-o); color: var(--color-o); background: rgba(255,71,87,0.1); }
.atom-n.active { border-color: var(--color-n); color: var(--color-n); background: rgba(62,129,247,0.1); }
.atom-cl.active { border-color: var(--color-cl); color: var(--color-cl); background: rgba(46,204,113,0.1); }
.atom-s.active { border-color: var(--color-s); color: var(--color-s); background: rgba(241,196,15,0.1); }
.atom-br.active { border-color: var(--color-br); color: var(--color-br); background: rgba(168,93,0,0.1); }

.atom-c span { color: var(--color-c); border: 1px solid var(--color-c); }
.atom-o span { color: var(--color-o); border: 1px solid var(--color-o); }
.atom-n span { color: var(--color-n); border: 1px solid var(--color-n); }
.atom-cl span { color: var(--color-cl); border: 1px solid var(--color-cl); }
.atom-s span { color: var(--color-s); border: 1px solid var(--color-s); }
.atom-br span { color: var(--color-br); border: 1px solid var(--color-br); }

/* Modules Palette */
.module-palette {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

.mod-btn {
    border-color: rgba(155, 89, 182, 0.3);
    color: #e0b0ff;
}
.mod-btn:hover {
    border-color: var(--neon-purple);
    background: rgba(155, 89, 182, 0.1);
}

/* Canvas UI Elements */
.canvas-header {
    background: rgba(10, 12, 16, 0.6);
    border-bottom: 1px solid var(--border-color);
    padding: 8px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    font-family: var(--font-code);
    font-size: 12px;
    color: var(--text-secondary);
}

#svg-wrapper {
    flex: 1;
    position: relative;
    cursor: crosshair;
}

#chem-svg {
    display: block;
    user-select: none;
    /* タッチ操作をブラウザのスクロール/ズームに奪われず、Pointer Eventsで全て処理する */
    touch-action: none;
}

/* SVG Rendering Elements Styles */
.svg-atom-node {
    cursor: pointer;
    transition: all 0.1s ease;
}

.svg-atom-node:hover circle {
    stroke-width: 3px;
    filter: drop-shadow(0 0 5px currentColor);
}

.svg-atom-text {
    font-family: var(--font-code);
    font-size: 16px;
    font-weight: bold;
    user-select: none;
    pointer-events: none;
}

.svg-bond-line {
    stroke-linecap: round;
    transition: stroke-width 0.1s ease;
}

.svg-bond-line:hover {
    stroke-width: 8px !important;
    cursor: pointer;
}

.svg-grid-helper {
    fill: none;
    stroke: rgba(255, 255, 255, 0.02);
    stroke-width: 1;
}

.svg-cursor-ghost {
    pointer-events: none;
    opacity: 0.4;
}

/* Right Panel Elements */
.stage-select-box select {
    width: 100%;
    padding: 10px;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 6px;
    font-size: 14px;
    outline: none;
    cursor: pointer;
}

.card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

#target-name {
    font-size: 20px;
    color: #fff;
}

.formula-badge {
    align-self: flex-start;
    font-family: var(--font-code);
    background: rgba(0, 242, 254, 0.1);
    color: var(--neon-blue);
    border: 1px solid rgba(0, 242, 254, 0.3);
    padding: 4px 10px;
    border-radius: 4px;
    font-weight: bold;
    font-size: 14px;
}

#target-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.primary-btn {
    width: 100%;
    background: var(--neon-blue);
    border: none;
    color: #000;
    font-weight: bold;
    text-align: center;
    padding: 12px;
    font-size: 15px;
    box-shadow: 0 0 15px rgba(0, 242, 254, 0.4);
    text-align: center;
}

.primary-btn:hover {
    background: #00d9e5;
    box-shadow: 0 0 20px rgba(0, 242, 254, 0.6);
}

.view-btn {
    background: rgba(0, 242, 254, 0.1);
    border-color: rgba(0, 242, 254, 0.3);
    color: var(--neon-blue);
    padding: 4px 10px;
    font-size: 11px;
    margin-right: 6px;
}
.view-btn:hover {
    background: var(--neon-blue);
    color: #fff;
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.4);
}

.danger-btn {
    background: rgba(255, 71, 87, 0.1);
    border-color: rgba(255, 71, 87, 0.3);
    color: var(--neon-red);
    padding: 4px 10px;
    font-size: 11px;
}
.danger-btn:hover {
    background: var(--neon-red);
    color: #fff;
}

.hint-box {
    font-size: 12px;
    color: var(--text-muted);
    border-top: 1px solid rgba(255,255,255,0.05);
    padding-top: 15px;
}

.hint-box h4 {
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.hint-box ul {
    padding-left: 15px;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

/* Result messages */
.result-message {
    padding: 12px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: bold;
    line-height: 1.4;
    text-align: center;
}

.result-message.success {
    background: rgba(46, 204, 113, 0.15);
    border: 1px solid var(--neon-green);
    color: var(--neon-green);
}

.result-message.error {
    background: rgba(255, 71, 87, 0.15);
    border: 1px solid var(--neon-red);
    color: var(--neon-red);
}

.hidden {
    display: none !important;
}

/* Modal Windows */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.85);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: rgba(15, 20, 28, 0.95);
    border: 2px solid var(--neon-blue);
    box-shadow: 0 0 30px rgba(0, 242, 254, 0.3);
    border-radius: 16px;
    padding: 30px;
    width: 90%;
    max-width: 450px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.neon-text {
    font-family: var(--font-code);
    font-size: 32px;
    color: var(--neon-green);
    text-shadow: 0 0 15px rgba(46, 204, 113, 0.6);
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.05); }
}

.animate-pulse {
    animation: pulse 2s infinite ease-in-out;
}

/* Toggle Switch Styles */
.switch input:checked + .slider {
    background-color: var(--neon-pink) !important;
    box-shadow: 0 0 10px var(--neon-pink);
}

.switch input:checked + .slider:before {
    transform: translateX(26px);
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

.slider {
    background-color: rgba(255,255,255,0.2) !important;
}

/* Asymmetric marking text */
.svg-asymmetric-star {
    font-family: var(--font-code);
    font-weight: bold;
    fill: var(--neon-pink) !important;
    text-shadow: 0 0 8px var(--neon-pink);
}

/* Reaction mechanism viewer */
.svg-charge {
    font-family: var(--font-code);
    font-weight: bold;
    fill: var(--neon-orange);
}

.svg-reaction-arrow {
    filter: drop-shadow(0 0 3px rgba(255, 42, 133, 0.6));
    pointer-events: none;
}

.svg-radical-dot {
    fill: var(--neon-orange);
}

#reaction-box select {
    padding: 8px;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 6px;
    font-size: 13px;
    outline: none;
    cursor: pointer;
}

#reaction-controls button:disabled {
    opacity: 0.35;
    cursor: default;
}