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

html {
    font-size: 16px;
}

body {
    margin: 0;
    padding: 0;
    background-color: #000000;
    color: white;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.5;
    min-height: 100vh;
    box-sizing: border-box;
}

.main-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px;
    min-height: calc(100vh - 3.5rem);
    position: relative;
}

.header {
    width: 100%;
    background-color: #000000;
    border-bottom: 1px solid #1f2937;
}

.header-container {
    max-width: 80rem;
    margin: 0 auto;
    padding: 0 1rem;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 3.5rem;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

.logo-link:hover {
    text-decoration: none;
    color: #fbbf24;
}

.logo-link:hover .logo {
    color: #fbbf24;
}

.logo-container img,
.logo-container .logo {
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
}

.nav-logo {
    width: 2rem;
    height: 2rem;
    vertical-align: middle;
    display: inline-block;
}

.logo {
    color: #ffffff;
    font-size: 1.125rem;
    font-weight: 700;
    line-height: 1;
    margin: 0;
    vertical-align: baseline;
    transition: color 0.3s ease;
}

.nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: #d1d5db;
    text-decoration: none;
    transition: color 0.2s;
}

.nav-link:hover {
    color: #ffffff;
}

html.mm-auth-pending #mm-auth-slot,
html.mm-auth-pending #mm-auth-slot-mobile {
    visibility: hidden;
}

.mm-nav-login-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin: 0;
    padding: 8px 16px;
    border-radius: 10px;
    border: 1px solid rgba(120, 145, 255, 0.45);
    background: rgba(92, 120, 255, 0.24);
    color: #fff;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    line-height: 1;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.mm-nav-login-btn:hover {
    background: rgba(92, 120, 255, 0.38);
    border-color: rgba(140, 165, 255, 0.55);
    color: #fff;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: #ffffff;
    transition: color 0.3s ease;
}

.mobile-menu-toggle:hover {
    color: #fbbf24;
}

.mobile-menu-toggle .hamburger-icon {
    width: 1.5rem;
    height: 1.5rem;
}

.mobile-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: #000000;
    border-bottom: 1px solid #1f2937;
    padding: 1rem;
    z-index: 1000;
}

.mobile-menu.active {
    display: block;
}

.mobile-menu-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.mobile-menu-link {
    color: #d1d5db;
    text-decoration: none;
    padding: 0.75rem 0;
    border-bottom: 1px solid #1f2937;
    transition: color 0.3s ease;
}

.mobile-menu-link:last-child {
    border-bottom: none;
}

.mobile-menu-link:hover {
    color: #ffffff;
}

.mobile-menu-link.active {
    color: #fbbf24;
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .header-content {
        position: relative;
    }
}

.footer {
    background-color: #111111;
    border-top: 1px solid #1f2937;
    padding: 2rem 1rem;
    margin-top: 4rem;
}

.footer-container {
    max-width: 80rem;
    margin: 0 auto;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-logo-img {
    width: 2rem;
    height: 2rem;
}

.footer-brand {
    color: #ffffff;
    font-size: 1.125rem;
    font-weight: 500;
}

.footer-info {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    align-items: center;
}

.footer-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    transition: opacity 0.2s;
}

.footer-link:hover {
    opacity: 0.8;
}

.amtf-logo {
    height: 2rem;
    width: auto;
}

.amtf-text {
    color: #d1d5db;
    font-size: 0.875rem;
}

.footer-copyright {
    color: #6b7280;
    font-size: 0.75rem;
}

@media (min-width: 768px) {
    .footer {
        padding: 1.5rem 1rem;
    }
    
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        text-align: left;
        gap: 2rem;
    }
    
    .footer-info {
        align-items: flex-end;
        text-align: right;
    }
    
    .footer-links {
        align-items: center;
    }
    
    .footer-link {
        flex-direction: row-reverse;
    }
}

h1 {
    font-size: clamp(28px, 6vw, 48px);
    margin-top: clamp(20px, 5vh, 50px);
    text-align: center;
    margin-bottom: 10px;
}

.subtitle {
    color: rgb(251, 191, 36);
    font-size: clamp(16px, 4vw, 24px);
    font-style: italic;
    text-align: center;
    margin-bottom: 20px;
}

.rules {
    text-align: center;
    margin: clamp(20px, 5vh, 50px) 0;
    display: none;
    flex-direction: column;
    align-items: center;
    max-width: 42rem;
    width: min(92%, 42rem);
    padding: 1.25rem 1.25rem 1rem;
    border-radius: 18px;
    border: 1px solid rgba(148, 163, 184, 0.28);
    background:
        linear-gradient(170deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.02)),
        rgba(15, 23, 42, 0.58);
    box-shadow:
        0 18px 42px rgba(2, 6, 23, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.22);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    position: relative;
}

.rules::before {
    content: "How to play";
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.9rem;
    padding: 0;
    color: #fcd34d;
    font-size: 0.84rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.rules p {
    margin: 0;
    width: min(46rem, 100%);
    text-align: left;
    padding: 0.25rem 0.1rem;
    font-size: clamp(14px, 3vw, 18px);
    line-height: 1.45;
    color: var(--text-1);
    display: block;
    position: relative;
    padding-left: 1.9rem;
    margin-left: auto;
    margin-right: auto;
}

.rules p::before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 999px;
    background: rgba(251, 191, 36, 0.92);
    position: absolute;
    left: 0.75rem;
    top: 0.86rem;
    box-shadow: 0 0 12px rgba(251, 191, 36, 0.38);
}

.rules p + p {
    margin-top: 0.58rem;
}

.rules .game-center-container {
    margin-top: 1rem;
}

.rules-fab {
    position: absolute;
    right: 0.75rem;
    bottom: 0.75rem;
    width: 44px;
    height: 44px;
    border: 1px solid rgba(255, 255, 255, 0.24);
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.86);
    color: var(--text-0);
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1200;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 26px rgba(2, 6, 23, 0.45);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.rules-fab:hover {
    transform: translateY(-2px);
    border-color: rgba(251, 191, 36, 0.52);
    box-shadow: 0 14px 28px rgba(2, 6, 23, 0.52), 0 0 16px rgba(251, 191, 36, 0.22);
}

.rules-fab-icon {
    width: 20px;
    height: 20px;
}

.rules-modal {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1300;
    padding: 1rem;
}

.rules-modal.open {
    display: flex;
}

.rules-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(2, 6, 23, 0.72);
    backdrop-filter: blur(4px);
}

.rules-modal-card {
    position: relative;
    width: min(95vw, 38rem);
    border-radius: 16px;
    border: 1px solid rgba(148, 163, 184, 0.26);
    background: linear-gradient(160deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.03)), rgba(15, 23, 42, 0.92);
    box-shadow: 0 24px 55px rgba(2, 6, 23, 0.58);
    padding: 1.1rem 1.1rem 1rem;
    text-align: center;
}

.rules-modal-header {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.4rem;
    position: relative;
}

.rules-modal-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-0);
}

.rules-modal-close {
    position: absolute;
    right: 0;
    top: 0;
    width: 34px;
    height: 34px;
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.3);
    background: rgba(30, 41, 59, 0.75);
    color: var(--text-0);
    cursor: pointer;
}

.rules-modal-list {
    margin: 0.45rem 0 1.8rem;
    padding-left: 0;
    list-style-position: inside;
    color: var(--text-1);
    line-height: 1.45;
}

.rules-modal-list li + li {
    margin-top: 0.85rem;
}

.rules-modal-card #rulesModalGotIt {
    display: block;
    margin: 0.8rem auto 0;
}

.game-container {
    width: 100%;
    max-width: 1024px;
    position: static;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.buttons-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: clamp(8px, 2vw, 20px);
    margin-top: clamp(30px, 8vh, 100px);
    padding: 0 10px;
}

.note-button {
    width: clamp(60px, 12vw, 100px);
    height: clamp(60px, 12vw, 100px);
    min-width: 60px;
    min-height: 60px;
    background-color: rgb(43, 43, 43);
    border: none;
    border-radius: clamp(8px, 2vw, 10px);
    color: white;
    font-size: clamp(20px, 4vw, 32px);
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.note-button:hover {
    background-color: rgb(60, 60, 60);
    transform: scale(1.05);
}

.note-button:active {
    transform: scale(0.95);
}

.note-button.active {
    background-color: rgb(254, 240, 138);
    box-shadow: 0 0 20px rgba(254, 240, 138, 0.5);
    color: #000000;
}

.note-button.playing {
    background-color: rgb(0, 255, 0);
    box-shadow: 0 0 20px rgba(0, 255, 0, 0.5);
    transform: scale(1.1);
}

.control-button {
    width: clamp(120px, 25vw, 160px);
    height: clamp(45px, 8vh, 60px);
    background-color: rgb(251, 191, 36);
    border: none;
    border-radius: clamp(6px, 1.5vw, 8px);
    color: #000000;
    font-size: clamp(14px, 3vw, 20px);
    font-weight: 600;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    text-align: center;
    line-height: 1.2;
    letter-spacing: 0.5px;
    cursor: pointer;
    margin: clamp(8px, 1.5vh, 15px);
    display: none;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transition: all 0.3s ease;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.control-button:hover {
    background-color: rgb(245, 158, 11);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.control-button:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.control-button:disabled {
    opacity: 0.65;
    cursor: wait;
    transform: none;
    box-shadow: none;
}

.control-button:disabled:hover {
    background-color: rgb(251, 191, 36);
    transform: none;
    box-shadow: none;
}

.level-display {
    font-size: clamp(48px, 12vw, 96px);
    color: rgb(251, 191, 36);
    text-align: center;
    display: none;
    margin: clamp(20px, 5vh, 40px) 0;
}

.round-counter {
    position: absolute;
    top: 0.75rem;
    right: 20px;
    background-color: rgba(251, 191, 36, 0.9);
    color: #000000;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    z-index: 10;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.game-over {
    text-align: center;
    display: none;
    padding: 20px;
    max-width: 90%;
}

.final-score {
    font-size: clamp(32px, 8vw, 64px);
    margin: clamp(10px, 3vh, 20px) 0;
}

.restart-prompt {
    color: rgb(251, 191, 36);
    font-size: clamp(16px, 4vw, 24px);
    margin-top: 20px;
}

@media screen and (min-width: 768px) and (max-width: 1024px) {
    .buttons-container {
        gap: 15px;
        margin-top: 60px;
    }
    
    .note-button {
        width: 80px;
        height: 80px;
        font-size: 28px;
    }
    
    .control-button {
        width: 180px;
        height: 70px;
        font-size: 28px;
    }
}

@media screen and (max-width: 767px) {
    
    .main-content {
        padding: 15px 10px;
        min-height: calc(100vh - 3.5rem - 2rem);
    }
    
    h1 {
        font-size: clamp(24px, 6vw, 32px);
        margin: 15px 0 10px 0;
        text-align: center;
    }
    
    .subtitle {
        font-size: clamp(16px, 4vw, 20px);
        margin-bottom: 20px;
        text-align: center;
    }
    
    .rules {
        margin: 20px 0;
        padding: 0 15px;
        max-width: 100%;
    }
    
    .rules p {
        margin: 8px 0;
        font-size: clamp(14px, 3.5vw, 16px);
        line-height: 1.4;
        text-align: center;
    }
    
    .buttons-container {
        gap: 10px;
        margin-top: 30px;
        padding: 0 10px;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .note-button {
        width: clamp(55px, 12vw, 70px);
        height: clamp(55px, 12vw, 70px);
        font-size: clamp(18px, 4vw, 24px);
        min-width: 55px;
        min-height: 55px;
        border-radius: 8px;
    }
    
    .control-button {
        width: clamp(140px, 30vw, 180px);
        height: clamp(50px, 10vh, 60px);
        font-size: clamp(16px, 3.5vw, 20px);
        margin: 10px;
        border-radius: 8px;
    }
    
    .game-container {
        padding: 0 10px;
        width: 100%;
        max-width: 100%;
    }
    
    .level-display {
        font-size: clamp(36px, 8vw, 48px);
        margin: 20px 0;
        text-align: center;
    }
    
    .round-counter {
        font-size: clamp(14px, 3vw, 16px);
        margin: 10px 0;
        text-align: center;
    }
    
    .chord-type,
    .interval-quality,
    .interval-distance {
        width: clamp(70px, 15vw, 100px);
        height: clamp(50px, 10vh, 70px);
        font-size: clamp(12px, 2.5vw, 16px);
        min-width: 70px;
        min-height: 50px;
        border-radius: 8px;
    }
    
    .harmony1 .chord-type {
        width: clamp(80px, 18vw, 120px);
        height: clamp(50px, 10vh, 70px);
    }
    
    .harmony2 .chord-type,
    .harmony3 .chord-type {
        width: clamp(75px, 16vw, 110px);
        height: clamp(50px, 10vh, 70px);
    }
    
    .game-over {
        padding: 15px;
        max-width: 95%;
    }
    
    .final-score {
        font-size: clamp(28px, 6vw, 48px);
        margin: 15px 0;
    }
    
    .restart-prompt {
        font-size: clamp(14px, 3vw, 20px);
        margin-top: 15px;
    }
}

@media screen and (max-width: 480px) {
    .main-content {
        padding: 10px 8px;
    }
    
    h1 {
        font-size: clamp(20px, 5vw, 28px);
        margin: 10px 0 8px 0;
    }
    
    .subtitle {
        font-size: clamp(14px, 3.5vw, 18px);
        margin-bottom: 15px;
    }
    
    .rules {
        margin: 15px 0;
        padding: 0 10px;
    }
    
    .rules p {
        margin: 6px 0;
        font-size: clamp(13px, 3vw, 15px);
    }
    
    .buttons-container {
        gap: 8px;
        margin-top: 25px;
        padding: 0 5px;
    }
    
    .note-button {
        width: clamp(50px, 11vw, 65px);
        height: clamp(50px, 11vw, 65px);
        font-size: clamp(16px, 3.5vw, 20px);
        min-width: 50px;
        min-height: 50px;
    }
    
    .control-button {
        width: clamp(120px, 28vw, 160px);
        height: clamp(45px, 9vh, 55px);
        font-size: clamp(14px, 3vw, 18px);
        margin: 8px;
    }
    
    .level-display {
        font-size: clamp(28px, 7vw, 40px);
        margin: 15px 0;
    }
    
    .chord-type,
    .interval-quality,
    .interval-distance {
        width: clamp(60px, 13vw, 90px);
        height: clamp(45px, 9vh, 65px);
        font-size: clamp(11px, 2.2vw, 14px);
        min-width: 60px;
        min-height: 45px;
    }
    
    .harmony1 .chord-type {
        width: clamp(70px, 15vw, 100px);
        height: clamp(45px, 9vh, 65px);
    }
    
    .harmony2 .chord-type,
    .harmony3 .chord-type {
        width: clamp(65px, 14vw, 95px);
        height: clamp(45px, 9vh, 65px);
    }
    
    .final-score {
        font-size: clamp(24px, 5vw, 40px);
        margin: 12px 0;
    }
    
    .restart-prompt {
        font-size: clamp(12px, 2.5vw, 18px);
        margin-top: 12px;
    }
}

@media screen and (max-height: 500px) and (orientation: landscape) {
    .main-content {
        padding: 8px 10px;
        min-height: calc(100vh - 3.5rem - 1rem);
    }
    
    h1 {
        font-size: clamp(18px, 4vh, 28px);
        margin: 8px 0 5px 0;
    }
    
    .subtitle {
        font-size: clamp(13px, 2.8vh, 16px);
        margin-bottom: 8px;
    }
    
    .buttons-container {
        margin-top: 15px;
        gap: 6px;
    }
    
    .note-button {
        width: clamp(40px, 7vh, 60px);
        height: clamp(40px, 7vh, 60px);
        font-size: clamp(14px, 2.8vh, 20px);
    }
    
    .control-button {
        width: clamp(100px, 20vw, 140px);
        height: clamp(35px, 7vh, 50px);
        font-size: clamp(12px, 2.5vh, 16px);
        margin: 5px;
    }
    
    .level-display {
        font-size: clamp(24px, 6vh, 40px);
        margin: 8px 0;
    }
    
    .round-counter {
        font-size: clamp(12px, 2.5vh, 14px);
        margin: 5px 0;
    }
    
    .rules {
        margin: 8px 0;
        padding: 0 8px;
    }
    
    .rules p {
        margin: 3px 0;
        font-size: clamp(11px, 2.2vh, 14px);
    }
    
    .chord-type,
    .interval-quality,
    .interval-distance {
        width: clamp(50px, 10vw, 80px);
        height: clamp(35px, 7vh, 55px);
        font-size: clamp(10px, 2vh, 13px);
    }
    
    .game-over {
        padding: 10px;
    }
    
    .final-score {
        font-size: clamp(20px, 5vh, 32px);
        margin: 8px 0;
    }
    
    .restart-prompt {
        font-size: clamp(11px, 2.2vh, 16px);
        margin-top: 8px;
    }
}

@media screen and (max-width: 767px) {
    input, select, textarea {
        font-size: 16px;
    }
    
    .input-container {
        margin: 20px 0;
        padding: 0 15px;
    }
    
    .input-container input {
        width: 100%;
        max-width: 200px;
        padding: 12px;
        font-size: 16px;
        border-radius: 8px;
        text-align: center;
    }
    
    .input-container label {
        font-size: clamp(14px, 3vw, 16px);
        margin-bottom: 8px;
        display: block;
        text-align: center;
    }
    
    .tap-container {
        margin: 20px 0;
        padding: 0 15px;
    }
    
    .tap-button {
        width: clamp(120px, 25vw, 160px);
        height: clamp(120px, 25vw, 160px);
        font-size: clamp(16px, 3.5vw, 20px);
        border-radius: 50%;
        margin: 10px;
    }
    
    .bpm-display {
        font-size: clamp(24px, 5vw, 32px);
        margin: 15px 0;
        text-align: center;
    }
    
    .score-display {
        font-size: clamp(18px, 4vw, 24px);
        margin: 10px 0;
        text-align: center;
    }
}

@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .note-button, .control-button {
        border: 0.5px solid rgba(255, 255, 255, 0.1);
    }
}

.game-center-container {
    display: flex;
    justify-content: center;
    width: 100%;
}

.game-center-align {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.game-center-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.game-center-row {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}

.game-center-row-gap {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.game-center-column-gap {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.game-center-align-gap {
    display: flex;
    align-items: center;
    gap: 10px;
}

.game-center-column-large-gap {
    display: flex;
    flex-direction: column;
    gap: 20px;
    justify-content: center;
    align-items: center;
}

.game-center-row-large-gap {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.game-center-align-large-gap {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.hidden {
    display: none;
}

.input-container {
    display: none;
    flex-direction: column;
    gap: 20px;
    justify-content: center;
    align-items: center;
    padding: 20px;
    margin: 20px auto;
    max-width: 600px;
}

.note-display {
    display: none;
}

.beat-indicator {
    display: none;
    width: 100px;
    height: 100px;
    background-color: rgb(251, 191, 36);
    border-radius: 50%;
    margin: 20px auto;
    transition: all 0.1s ease;
    box-shadow: 0 0 20px rgba(251, 191, 36, 0.3);
}

.beat-indicator.active {
    background-color: rgb(254, 240, 138);
    box-shadow: 0 0 30px rgba(254, 240, 138, 0.6);
    transform: scale(1.2);
}

.ready-display {
    display: none;
    text-align: center;
    margin: 40px 0;
}

.ready-title {
    color: rgb(251, 191, 36);
    font-size: 48px;
    margin-bottom: 20px;
}

.ready-text {
    color: white;
    font-size: 18px;
}

.tap-container {
    display: none;
    flex-direction: column;
    gap: 20px;
    justify-content: center;
    align-items: center;
}

.tap-area {
    width: 300px;
    height: 200px;
    background-color: rgb(40, 40, 40);
    border: 3px solid rgb(251, 191, 36);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.1s ease;
    user-select: none;
    -webkit-user-select: none;
}

.tap-area:hover {
    background-color: rgba(251, 191, 36, 0.15);
    border-color: rgb(251, 191, 36);
}

.tap-area:active {
    background-color: rgba(251, 191, 36, 0.2);
    border-color: rgb(251, 191, 36);
    transform: scale(0.95);
}

.tap-text {
    color: white;
    font-size: 24px;
    font-weight: bold;
}

.tap-instructions {
    color: white;
    font-size: 16px;
    text-align: center;
}

.tap-counter {
    color: rgb(251, 191, 36);
    font-weight: bold;
    margin-top: 10px;
}

.buttons-container-column {
    display: none;
    flex-direction: column;
    gap: 10px;
}

.buttons-container-row {
    display: none;
    flex-direction: row;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.buttons-container-column-large {
    display: none;
    flex-direction: column;
    gap: 15px;
    justify-content: center;
    align-items: center;
}

.buttons-row-large-gap {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding: 0 10px;
    height: 120px;
    align-items: center;
}

.buttons-row-small-gap {
    display: flex;
    gap: 15px;
    justify-content: center;
}

.spacer-small {
    height: 5px;
}

.spacer-large {
    height: 10px;
}

.hidden-placeholder {
    width: 100px;
    visibility: hidden;
}

.control-button-block {
    margin-top: 10px;
    display: block;
}

.control-button-hidden {
    display: none;
}

.error-message {
    color: rgb(220, 38, 38);
    font-size: 16px;
    text-align: center;
    display: none;
}

.cents-label {
    color: white;
    font-size: 18px;
    font-weight: bold;
}

.play-again-button {
    display: none;
}

.continue-button {
    display: flex;
    justify-content: center;
    width: 100%;
}

.interval-quality,
.interval-distance {
    width: clamp(60px, 12vw, 100px);
    height: clamp(60px, 12vw, 100px);
    min-width: 60px;
    min-height: 60px;
    background-color: rgb(43, 43, 43);
    border: none;
    border-radius: clamp(8px, 2vw, 10px);
    color: white;
    font-size: clamp(12px, 3vw, 16px);
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    padding: 5px;
}

.interval-quality:hover,
.interval-distance:hover {
    background-color: rgb(60, 60, 60);
    transform: scale(1.05);
}

.interval-quality:active,
.interval-distance:active {
    transform: scale(0.95);
}

.interval-quality.selected,
.interval-distance.selected {
    background-color: rgb(254, 240, 138);
    box-shadow: 0 0 20px rgba(254, 240, 138, 0.5);
    transform: scale(1.05);
    color: #000000;
}

.interval-quality.correct,
.interval-distance.correct {
    background-color: rgb(34, 197, 94);
    box-shadow: 0 0 20px rgba(34, 197, 94, 0.5);
    transform: scale(1.05);
}

.interval-quality.active,
.interval-distance.active {
    cursor: pointer;
    pointer-events: auto;
    opacity: 1;
}

.interval-quality:not(.active),
.interval-distance:not(.active) {
    cursor: not-allowed;
    pointer-events: none;
    opacity: 0.5;
}

.chord-type {
    width: clamp(60px, 12vw, 100px);
    height: clamp(60px, 12vw, 100px);
    min-width: 60px;
    min-height: 60px;
    background-color: rgb(43, 43, 43);
    border: none;
    border-radius: clamp(8px, 2vw, 10px);
    color: white;
    font-size: clamp(12px, 3vw, 16px);
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.chord-type:hover {
    background-color: rgb(60, 60, 60);
    transform: scale(1.05);
}

.chord-type:active {
    transform: scale(0.95);
}

.chord-type.selected {
    background-color: rgb(254, 240, 138);
    box-shadow: 0 0 20px rgba(254, 240, 138, 0.5);
    color: #000000;
}

.chord-type.correct {
    background-color: rgb(34, 197, 94);
    box-shadow: 0 0 20px rgba(34, 197, 94, 0.5);
}

.chord-type.active {
    cursor: pointer;
    pointer-events: auto;
    opacity: 1;
}

.chord-type:not(.active) {
    cursor: not-allowed;
    pointer-events: none;
    opacity: 0.5;
}

.extension-type {
    width: clamp(80px, 15vw, 120px);
    height: clamp(60px, 12vw, 100px);
    min-width: 80px;
    min-height: 60px;
    background-color: rgb(43, 43, 43);
    border: none;
    border-radius: clamp(8px, 2vw, 10px);
    color: white;
    font-size: clamp(10px, 2.5vw, 14px);
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    padding: 5px;
}

.extension-type:hover {
    background-color: rgb(60, 60, 60);
    transform: scale(1.05);
}

.extension-type:active {
    transform: scale(0.95);
}

.extension-type.selected {
    background-color: rgb(254, 240, 138);
    box-shadow: 0 0 20px rgba(254, 240, 138, 0.5);
    transform: scale(1.05);
    color: #000000;
}

.extension-type.correct {
    background-color: rgb(34, 197, 94);
    box-shadow: 0 0 20px rgba(34, 197, 94, 0.5);
    transform: scale(1.05);
}

.extension-type.active {
    cursor: pointer;
    pointer-events: auto;
    opacity: 1;
}

.extension-type:not(.active) {
    cursor: not-allowed;
    pointer-events: none;
    opacity: 0.5;
}

.harmony1 .chord-type {
    width: clamp(60px, 12vw, 100px);
    height: clamp(60px, 12vw, 100px);
    min-width: 60px;
    min-height: 60px;
    font-size: clamp(12px, 3vw, 16px);
}

.harmony2 .chord-type,
.harmony3 .chord-type {
    width: clamp(60px, 12vw, 100px);
    height: clamp(60px, 12vw, 100px);
    min-width: 60px;
    min-height: 60px;
    font-size: clamp(12px, 3vw, 16px);
}

.game-input {
    padding: 12px 20px;
    font-size: 18px;
    border: 2px solid rgb(251, 191, 36);
    border-radius: 8px;
    background-color: rgb(43, 43, 43);
    color: white;
    text-align: center;
    width: 200px;
    outline: none;
    transition: all 0.3s ease;
}

.game-input:focus {
    border-color: rgb(254, 240, 138);
    box-shadow: 0 0 10px rgba(254, 240, 138, 0.3);
}

.black-note {
    background-color: #333;
}

.white-note {
    background-color: #666;
}

.melody-background::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-size: cover;
    background-color: black;
    background-position: center;
    background-repeat: no-repeat;
    filter: grayscale(100%) brightness(0.18);
}

/* --- Shared modern theme overrides for game pages --- */
:root {
    --bg-0: #05070d;
    --bg-1: #0b1020;
    --surface: rgba(16, 23, 43, 0.78);
    --surface-strong: rgba(20, 29, 53, 0.92);
    --border: rgba(148, 163, 184, 0.2);
    --text-0: #f8fafc;
    --text-1: #cbd5e1;
    --text-2: #94a3b8;
    --brand: #fbbf24;
    --brand-strong: #f59e0b;
    --ok: #22c55e;
    --danger: #ef4444;
    --radius: 14px;
}

body {
    background:
        radial-gradient(circle at 10% 10%, rgba(251, 191, 36, 0.12), transparent 36%),
        radial-gradient(circle at 86% 2%, rgba(59, 130, 246, 0.14), transparent 34%),
        linear-gradient(180deg, var(--bg-0), var(--bg-1) 38%, var(--bg-0));
    color: var(--text-0);
}

@media (max-width: 768px) {
    body {
        background: var(--bg-0);
    }
}

.header {
    position: sticky;
    top: 0;
    z-index: 50;
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
    background: rgba(5, 7, 13, 0.78);
}

.header-container {
    max-width: 74rem;
}

.logo {
    letter-spacing: normal;
    font-size: 1rem;
    font-weight: 700;
}

.nav-link,
.mobile-menu-link {
    color: var(--text-1);
    font-weight: 500;
}

.nav-link:hover,
.mobile-menu-link:hover,
.nav-link.active,
.mobile-menu-link.active {
    color: var(--text-0);
}

.mobile-menu {
    background: var(--surface-strong);
    border-color: var(--border);
    border-radius: 0 0 12px 12px;
}

.main-content {
    padding-top: 1.5rem;
    position: relative;
}

h1 {
    font-size: clamp(2rem, 6vw, 3.5rem);
    letter-spacing: -0.02em;
    margin-top: 1.5rem;
}

.subtitle {
    color: var(--text-1);
    font-style: normal;
}

.rules {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: calc(var(--radius) + 2px);
    padding: 1.1rem 1.2rem;
}

.rules p {
    color: var(--text-1);
}

.note-button,
.chord-type,
.interval-quality,
.interval-distance,
.extension-type {
    background: rgba(148, 163, 184, 0.14);
    border: 1px solid rgba(148, 163, 184, 0.24);
    border-radius: var(--radius);
}

.note-button:hover,
.chord-type:hover,
.interval-quality:hover,
.interval-distance:hover,
.extension-type:hover {
    background: rgba(148, 163, 184, 0.24);
}

.note-button.active,
.chord-type.selected,
.interval-quality.selected,
.interval-distance.selected,
.extension-type.selected {
    background: linear-gradient(120deg, var(--brand), var(--brand-strong));
    color: #111827;
}

.note-button.playing,
.chord-type.correct,
.interval-quality.correct,
.interval-distance.correct,
.extension-type.correct {
    background: var(--ok);
    color: #022c22;
}

.control-button {
    background: linear-gradient(130deg, var(--brand), var(--brand-strong));
    border: 1px solid rgba(255, 255, 255, 0.28);
    border-radius: 999px;
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.28);
}

.round-counter {
    background: rgba(251, 191, 36, 0.94);
}

.game-over {
    background: transparent;
    border: none;
    border-radius: 0;
    box-shadow: none;
}

.final-score {
    color: var(--text-0);
}

.game-over .control-button {
    width: clamp(112px, 20vw, 150px);
    height: clamp(40px, 7vh, 52px);
    font-size: clamp(13px, 2.4vw, 17px);
}

.restart-prompt {
    color: var(--text-1);
}

.tap-area {
    background: rgba(148, 163, 184, 0.1);
    border-color: rgba(251, 191, 36, 0.64);
}

.tap-area:hover {
    background: rgba(251, 191, 36, 0.14);
}

.footer {
    border-top: 1px solid var(--border);
    background: transparent;
}

.footer-copyright,
.amtf-text {
    color: var(--text-2);
}