:root {
    --bg-base: #06070a;
    --bg-panel: #0d0e12;
    --bg-input: #12141c;
    --border: #1e222d;
    --border-focus: #00f3ff;
    --neon-cyan: #00f3ff;
    --neon-pink: #ff0055;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #475569;
    --shadow-cyan: rgba(0, 243, 255, 0.15);
    --shadow-pink: rgba(255, 0, 85, 0.2);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 20px;
}

.container {
    width: 100%;
    max-width: 1000px;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
}

@media (max-width: 850px) {
    .container {
        padding: 24px 16px;
    }
}

header {
    border-bottom: 1px solid var(--border);
    padding-bottom: 24px;
    margin-bottom: 32px;
    text-align: left;
}

h1 {
    font-size: 1.8rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--neon-cyan);
    text-shadow: 0 0 12px var(--shadow-cyan);
}

.subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 6px;
    font-family: monospace;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.back-link {
    display: inline-block;
    color: var(--text-secondary);
    text-decoration: none;
    font-family: monospace;
    font-size: 0.8rem;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: bold;
    transition: color 0.2s ease;
}

.back-link:hover {
    color: var(--neon-cyan);
}

footer {
    margin-top: 40px;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
    font-family: monospace;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 8px;
}

.cyber-logo {
    width: 42px;
    height: 42px;
    transition: transform 0.3s ease, filter 0.3s ease;
}

.cyber-logo:hover {
    transform: rotate(60deg);
    filter: drop-shadow(0 0 8px var(--neon-pink));
}

.logo-hexagon {
    fill: none;
    stroke: var(--neon-cyan);
    stroke-width: 6;
    filter: drop-shadow(0 0 4px var(--shadow-cyan));
}

.logo-core {
    fill: none;
    stroke: var(--neon-pink);
    stroke-width: 6;
    stroke-linecap: round;
    stroke-linejoin: round;
    filter: drop-shadow(0 0 5px var(--shadow-pink));
}

.header-body {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-top: 12px;
}

.header-logo {
    width: 52px;
    height: 52px;
    flex-shrink: 0;
    filter: drop-shadow(0 0 8px var(--shadow-cyan));
    transition: transform 0.3s ease, filter 0.3s ease;
}

.header-logo:hover {
    transform: rotate(15deg) scale(1.05);
    filter: drop-shadow(0 0 12px var(--neon-pink));
}

.header-text {
    display: flex;
    flex-direction: column;
}

.hub-grid {
    display: flex;
    flex-direction: column;
    gap: 40px;
    margin-top: 24px;
}

.category-section h2 {
    color: var(--neon-cyan);
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 20px;
    border-left: 3px solid var(--neon-pink);
    padding-left: 12px;
    text-shadow: 0 0 10px var(--shadow-cyan);
}

.tools-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.tool-card {
    background-color: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 24px;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background-color: var(--text-muted);
    transition: all 0.3s ease;
}

.tool-card:hover {
    border-color: var(--border-focus);
    box-shadow: 0 0 20px rgba(0, 243, 255, 0.1);
    transform: translateY(-2px);
}

.tool-card:hover::before {
    background-color: var(--neon-cyan);
    box-shadow: 0 0 10px var(--neon-cyan);
}

.category-section.creative h2 {
    color: var(--neon-pink);
    text-shadow: 0 0 10px var(--shadow-pink);
    border-left-color: var(--neon-cyan);
}

.category-section.creative .tool-card:hover::before {
    background-color: var(--neon-pink);
    box-shadow: 0 0 10px var(--neon-pink);
}

.category-section.creative .tool-card:hover {
    border-color: var(--neon-pink);
    box-shadow: 0 0 20px rgba(255, 0, 85, 0.15);
}

.tool-name {
    font-size: 1.1rem;
    font-weight: 800;
    font-family: monospace;
    letter-spacing: 1px;
    margin-bottom: 8px;
    text-transform: uppercase;
}

.tool-name.cyan-text {
    color: var(--neon-cyan);
}

.tool-name.pink-text {
    color: var(--neon-pink);
}

.tool-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.tool-tag {
    align-self: flex-start;
    font-family: monospace;
    font-size: 0.65rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 3px 8px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    color: var(--text-muted);
    margin-top: 16px;
}

.header-body {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-top: 12px;
}

.header-logo {
    width: 52px;
    height: 52px;
    flex-shrink: 0;
    filter: drop-shadow(0 0 8px var(--shadow-cyan));
    transition: transform 0.3s ease, filter 0.3s ease;
}

.header-logo:hover {
    transform: rotate(15deg) scale(1.05);
    filter: drop-shadow(0 0 12px var(--neon-pink));
}

.header-text {
    display: flex;
    flex-direction: column;
}

.calc-grid {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 32px;
    margin-bottom: 48px;
}

@media (max-width: 850px) {
    .calc-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

.chord-control {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.chord-selector {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.chord-btn {
    background-color: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 12px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: bold;
    font-family: monospace;
    transition: all 0.2s ease;
    text-align: center;
}

.chord-btn:hover {
    border-color: var(--neon-pink);
    color: var(--text-primary);
}

.chord-btn.active {
    border-color: var(--neon-pink);
    color: var(--text-primary);
    box-shadow: 0 0 14px var(--shadow-pink);
}

.chord-info-card {
    background: rgba(255, 255, 255, 0.01);
    border: 1px dashed var(--border);
    border-radius: 12px;
    padding: 20px;
}

.chord-name-large {
    font-size: 2.2rem;
    font-weight: 900;
    color: var(--neon-pink);
    text-shadow: 0 0 15px var(--shadow-pink);
    font-family: monospace;
    margin-bottom: 8px;
}

.chord-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 20px;
}

.strum-btn {
    background: transparent;
    border: 1px solid var(--neon-cyan);
    color: var(--neon-cyan);
    padding: 14px;
    border-radius: 10px;
    font-family: monospace;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    cursor: pointer;
    width: 100%;
    transition: all 0.2s ease;
    box-shadow: 0 0 10px rgba(0, 243, 255, 0.05);
}

.strum-btn:hover {
    background: rgba(0, 243, 255, 0.05);
    box-shadow: 0 0 15px var(--shadow-cyan);
}

.fretboard-container {
    background-color: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 28px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.fretboard-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: var(--neon-cyan);
    box-shadow: 0 0 12px var(--neon-cyan);
}

.fretboard-svg {
    width: 100%;
    max-width: 280px;
    height: auto;
}

.fretboard-bg {
    fill: rgba(18, 20, 28, 0.7);
    stroke: var(--border);
    stroke-width: 2;
}

.fret-line {
    stroke: var(--text-muted);
    stroke-width: 2px;
}

.string-line {
    stroke: var(--text-muted);
    stroke-linecap: round;
}

.nut-line {
    stroke: var(--text-primary);
    stroke-width: 6px;
}

.finger-marker {
    fill: var(--neon-pink);
    filter: drop-shadow(0px 0px 6px var(--neon-pink));
}

.finger-text {
    fill: var(--text-primary);
    font-size: 11px;
    font-family: monospace;
    font-weight: bold;
    text-anchor: middle;
    dominant-baseline: central;
}

.string-label {
    fill: var(--text-muted);
}

.open-mute-text {
    fill: var(--text-secondary);
    font-size: 12px;
    font-family: monospace;
    font-weight: bold;
    text-anchor: middle;
}

.open-mute-text.active-open {
    fill: var(--neon-cyan);
    filter: drop-shadow(0px 0px 4px var(--neon-cyan));
}

.simulator-container {
    background-color: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.simulator-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: var(--neon-cyan);
    box-shadow: 0 0 12px var(--neon-cyan);
}

.arm-svg {
    background: #090a0f;
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    cursor: crosshair;
    width: 100%;
    max-width: 360px;
    height: auto;
}

.control-panel {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.param-group {
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
}

.param-title {
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--neon-cyan);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.slider-row label {
    width: 80px;
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

input[type=range] {
    flex-grow: 1;
    accent-color: var(--neon-cyan);
}

.value-display {
    width: 50px;
    text-align: right;
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.angle-output-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 10px;
}

.angle-card {
    background: var(--bg-base);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    text-align: center;
}

.angle-card .lbl {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-family: monospace;
}

.angle-card .lbl.bottom-spacing {
    margin-top: 4px;
}

.angle-card .val {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--neon-pink);
    font-family: monospace;
    text-shadow: 0 0 10px var(--shadow-pink);
    margin-top: 4px;
}

.code-box {
    background: #090a0f;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    font-family: monospace;
    font-size: 0.8rem;
    color: #a7f3d0;
    white-space: pre-wrap;
    overflow-x: auto;
    max-height: 100px;
}

.arm-link {
    stroke: var(--text-primary);
    stroke-width: 6;
    stroke-linecap: round;
}

.arm-link-2 {
    stroke: var(--neon-cyan);
    stroke-width: 4;
    stroke-linecap: round;
}

.joint {
    fill: var(--bg-panel);
    stroke: var(--text-primary);
    stroke-width: 3;
}

.target-point {
    fill: var(--neon-pink);
    stroke: var(--text-primary);
    stroke-width: 2;
    cursor: pointer;
    filter: drop-shadow(0px 0px 6px var(--neon-pink));
}

.grid-line {
    stroke: rgba(255, 255, 255, 0.05);
    stroke-width: 1;
}

.reach-circle {
    fill: none;
    stroke: var(--border);
    stroke-width: 1;
    stroke-dasharray: 4 4;
}

.helper-text {
    font-family: monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 10px;
}

.seo-section {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.seo-section h2 {
    color: var(--neon-cyan);
    font-size: 1.4rem;
    font-family: monospace;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-shadow: 0 0 10px var(--shadow-cyan);
}

.seo-section p {
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.seo-section ul {
    margin-bottom: 24px;
    padding-left: 20px;
}

.seo-section li {
    margin-bottom: 10px;
    line-height: 1.6;
    color: var(--text-secondary);
}

.seo-section strong {
    color: var(--text-primary);
}

.math-block {
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin: 20px 0;
    overflow-x: auto;
    text-align: center;
}

.faq-section {
    margin-top: 48px;
    margin-bottom: 64px;
}

.faq-container {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-top: 24px;
}

.faq-item {
    background-color: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: var(--neon-cyan);
    box-shadow: 0 0 12px rgba(0, 243, 255, 0.05);
}

.faq-trigger {
    width: 100%;
    background: none;
    border: none;
    padding: 20px 24px;
    text-align: left;
    color: var(--text-primary);
    font-family: monospace;
    font-size: 0.95rem;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    transition: color 0.3s ease;
}

.faq-trigger:hover {
    color: var(--neon-cyan);
}

.faq-trigger::after {
    content: '+';
    color: var(--neon-cyan);
    font-size: 1.3rem;
    font-weight: normal;
    transition: transform 0.3s ease, color 0.3s ease;
}

.faq-item.active {
    border-color: var(--neon-pink);
    box-shadow: 0 0 15px rgba(255, 0, 85, 0.05);
}

.faq-item.active .faq-trigger {
    color: var(--neon-pink);
}

.faq-item.active .faq-trigger::after {
    content: '−';
    color: var(--neon-pink);
    transform: rotate(180deg);
}

.faq-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
    padding: 0 24px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
}

.faq-item.active .faq-content {
    max-height: 1000px;
    transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
    padding-bottom: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.03);
    padding-top: 16px;
}

.faq-content p {
    margin-bottom: 12px;
}

.faq-content p:last-child {
    margin-bottom: 0;
}

.dice-panel {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.dice-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

@media (max-width: 480px) {
    .dice-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.dice-btn {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px;
    color: var(--text-primary);
    font-family: monospace;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.dice-btn::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--neon-cyan);
    transform: scaleX(0);
    transition: transform 0.2s ease;
}

.dice-btn:hover {
    border-color: var(--neon-cyan);
    box-shadow: 0 0 12px rgba(0, 243, 255, 0.15);
    transform: translateY(-1px);
}

.dice-btn:hover::after {
    transform: scaleX(1);
}

.dice-btn.active-dice {
    border-color: var(--neon-pink);
    box-shadow: 0 0 14px var(--shadow-pink);
    color: var(--neon-pink);
}

.dice-btn.active-dice::after {
    transform: scaleX(1);
    background: var(--neon-pink);
}

.roll-display-container {
    background-color: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 240px;
    position: relative;
    overflow: hidden;
}

.roll-display-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: var(--neon-pink);
    box-shadow: 0 0 12px var(--neon-pink);
}

.roll-result {
    font-size: 5.5rem;
    font-weight: 900;
    font-family: monospace;
    color: var(--neon-pink);
    text-shadow: 0 0 25px var(--shadow-pink);
    line-height: 1;
    margin-bottom: 12px;
    transition: transform 0.1s ease;
}

.roll-result.rolling {
    animation: shakeRoll 0.12s infinite;
    color: var(--neon-cyan);
    text-shadow: 0 0 25px var(--shadow-cyan);
}

@keyframes shakeRoll {
    0% { transform: translate(2px, 1px) rotate(0deg) scale(0.95); }
    10% { transform: translate(-1px, -2px) rotate(-2deg); }
    20% { transform: translate(-3px, 0px) rotate(2deg); }
    30% { transform: translate(0px, 2px) rotate(0deg); }
    40% { transform: translate(1px, -1px) rotate(2deg) scale(1.05); }
    50% { transform: translate(-1px, 2px) rotate(-2deg); }
    60% { transform: translate(-3px, 1px) rotate(0deg); }
    70% { transform: translate(2px, 1px) rotate(-2deg); }
    80% { transform: translate(-1px, -1px) rotate(2deg); }
    90% { transform: translate(2px, 2px) rotate(0deg); }
    100% { transform: translate(1px, -2px) rotate(-2deg) scale(0.95); }
}

.roll-meta {
    font-family: monospace;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.modifier-box {
    display: flex;
    align-items: center;
    gap: 12px;
}

.modifier-box label {
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.modifier-input {
    background: var(--bg-base);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 12px;
    color: var(--text-primary);
    font-family: monospace;
    font-size: 0.9rem;
    width: 70px;
    text-align: center;
    transition: all 0.2s ease;
}

.modifier-input:focus {
    border-color: var(--neon-cyan);
    outline: none;
    box-shadow: 0 0 10px rgba(0, 243, 255, 0.1);
}

.history-box {
    background: #090a0f;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    font-family: monospace;
}

.history-title {
    font-size: 0.75rem;
    color: var(--neon-cyan);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 6px;
    display: flex;
    justify-content: space-between;
}

.clear-history-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.7rem;
    text-transform: uppercase;
}

.clear-history-btn:hover {
    color: var(--neon-pink);
}

.history-list {
    display: flex;
    flex-direction: column-reverse;
    gap: 6px;
    max-height: 120px;
    overflow-y: auto;
    padding-right: 4px;
}

.history-item {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
    padding: 4px 0;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.02);
}

.history-item .hist-formula {
    color: var(--text-muted);
}

.history-item .hist-total {
    color: var(--neon-pink);
    font-weight: bold;
}

.oracle-section {
    background: rgba(255, 255, 255, 0.01);
    border: 1px dashed var(--border);
    border-radius: 10px;
    padding: 16px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.oracle-section:hover {
    border-color: var(--neon-pink);
    background: rgba(255, 0, 85, 0.02);
}

.oracle-title {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-family: monospace;
    margin-bottom: 6px;
    letter-spacing: 1px;
}

.oracle-result {
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--neon-cyan);
    font-family: monospace;
    text-shadow: 0 0 10px var(--shadow-cyan);
}