@font-face {
    font-family: "Bravura";
    src: url("fonts/Bravura.woff2") format("woff2");
}

@font-face {
    font-family: "Inter";
    src: url("fonts/InterVariable.woff2") format("woff2");
}

:root {
    --key-width-by-height: calc(min(26vh, 260px) / 3.3);
    --key-width-by-viewport: calc(90vw / 7);
    --key-width: min(var(--key-width-by-height), var(--key-width-by-viewport));
    --key-height: calc(var(--key-width) * 3.3);
    --keyboard-width: calc(var(--key-width) * 7);
    --black-key-width: calc(var(--key-width) * 0.6);
    --black-key-offset: calc(var(--key-width) * 0.06);
    
    --ink: #5c4632;
    --accent: #c99a3f;
    --background: #fffdf4;
   
    --shadow: 0 2px 4px rgba(92, 70, 50, 0.15);
    --shadow-hover: 0 4px 8px rgba(92, 70, 50, 0.2);
    
    --radius: 8px;
    --transition: 0.15s ease;

    --hover-lift: -2px;
} 

.tools-list {
    padding: 100px 80px;
    text-align: center;
    background-color: var(--default-background-color);
}

.tools-list h1{
    font-family: "Inter", sans-serif;
    font-size: clamp(50px, 7vw, 70px);
    font-weight: 700;
    color: var(--ink);
    letter-spacing: 2px;
    border-bottom: 2px solid var(--ink);
    padding-bottom: 7px;
    margin-top: 0;
    margin-bottom: 40px;
    position: relative;
    top: -30px;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

.tools-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    border: 1px solid var(--ink);
    background-color: transparent;
    overflow: hidden;
    text-decoration: none;
    color: var(--ink);
}

.tools-card:hover {
    border-color: var(--accent)
}

.tools-card h2 {
    font-family: "Inter", sans-serif;
    color: var(--ink);
    font-size: clamp(14px, 1.4vw, 20px);
    margin: 12px;
}

.tool-preview {
    width: 100%;
    overflow: hidden;
}

.tool-preview img {
    display: block;
    width: 100%;
    height: auto;
}
.tools-card-coming-soon .tool-preview {
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 20px;
}

.tools-card-coming-soon .tool-preview img {
    width: 150px;
    height: auto;
    filter: grayscale(30%) saturate(70%);
}

.tools-card-coming-soon {
    border-color: #8a8175;
}

.tools-card-coming-soon h2 {
    color: #8a8175;
}

.tools-card-coming-soon:hover {
    border-color: #8a8175;
}

.contact {
    text-align: center;
}

footer {
    text-align: center;
}

button {
    color: var(--ink);
    background-color: transparent;
    border: 1px solid var(--ink);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition);
}

.clef-btn {
    font-family: "Bravura";
    width: 50px; 
    height: clamp(40px, 7vh, 60px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.clef-btn[data-clef="treble"] .glyph {
    font-size: clamp(16px, 3.8vh, 25px);
    transform: translate(0, 0.2em);
}

.clef-btn[data-clef="bass"] .glyph {
    font-size: clamp(24px, 6vh, 40px);
    transform: translate(0, -0.15em);
}

.clef-btn[data-clef="alto"] .glyph {
    font-size: clamp(21px, 5.2vh, 35px);
    transform: translate(0, 0);
}

.slider-track {
    position: relative;
    height: 24px;
    width: clamp(90px, 25vw, 280px);
}

.slider-track input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 4px;
    transform: translateY(-50%);
    margin: 0;
    pointer-events: none;
    z-index: 1;
}

.slider-track input[type="range"]::-webkit-slider-runnable-track {
    background: transparent;
    height: 4px;
}

.slider-track input[type="range"]::-moz-range-track {
    background:transparent;
    height: 4px;
}

.slider-track::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 4px;
    background: #ccc;
    transform: translateY(-50%);
    border-radius: 2px;
    pointer-events: none;
    z-index: 0;
}

.slider-track input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    pointer-events: auto;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--ink);
    cursor: pointer;
    margin-top: -2px;
    transition: transform 0.15s ease;
}

.slider-track input[type="range"]:active::-webkit-slider-thumb {
    transform: scale(2.5);
}

.slider-track input[type="range"]::-moz-range-thumb {
    pointer-events: auto;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--ink);
    cursor: pointer;
    border: none;
    margin-top: -2px;
    transition: transform var(--transition);
}

.slider-track input[type="range"]:active::-moz-range-thumb {
    transform: scale(2.5);
}

.slider-fill {
    position: absolute;
    top: 50%;
    height: 4px;
    background: var(--ink);
    transform: translateY(-50%);
    pointer-events: none;
    border-radius: 2px;
}

.staff-line {
    stroke: var(--ink);
}

.note-head {
    fill: var(--ink);
}

.note-stem {
    stroke: var(--ink);
    stroke-width: 2;
}

.note-beam{
    stroke: var(--ink);
    stroke-width: 4;
}

.clef-glyph {
    fill: var(--ink);
}

#keyboard {
    width: var(--keyboard-width);
    position: relative;
    display: flex;
    justify-content: center;
}

.key {
    width: var(--key-width);
    height: var(--key-height);
    background-color: transparent;
    border: 1px solid var(--ink);
    margin: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    padding-bottom: 16px;
    color: var(--ink);
    font-size: clamp(18px, 2vw, 24px);
    cursor: pointer;
}

.black-key {
    width: var(--black-key-width);
    height: calc(var(--key-width) * 2);
    position: absolute;
    background-color: var(--ink);
    top: 0;
    z-index:1;
    border-bottom-left-radius: 2.5px;
    border-bottom-right-radius: 2.5px;
}

.black-key:nth-of-type(1) {left: calc(var(--key-width) * 1 - var(--black-key-width) / 2 - var(--black-key-offset)); }
.black-key:nth-of-type(2) {left: calc(var(--key-width) * 2 - var(--black-key-width) / 2 + var(--black-key-offset)); }
.black-key:nth-of-type(3) {left: calc(var(--key-width) * 4 - var(--black-key-width) / 2 - var(--black-key-offset)); }
.black-key:nth-of-type(4) {left: calc(var(--key-width) * 5 - var(--black-key-width) / 2); }
.black-key:nth-of-type(5) {left: calc(var(--key-width) * 6 - var(--black-key-width) / 2 + var(--black-key-offset)); }

body {
    font-family: "Inter", sans-serif;
    background-color: var(--default-background-color);
    color: var(--ink);
    margin: 0;
    transition: background-color 0.15s ease;
}

body.flash-correct {
    background-color: #00BFA5;
}

body.flash-wrong {
    background-color: #FF6F00;
}

#topControls, #bottomControls {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: clamp(12px, 3vw, 32px);
    min-height: 8vh;
    overflow: visible;
}

#home-button {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--ink);
    background-color: transparent;
    border: 1px solid var(--ink);
    cursor: pointer;
}

.home-icon::before {
    content: "";
    position: absolute;
    left: -4px;
    top: -7px;
    width: 0;
    height: 0;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-bottom: 8px solid var(--ink);
}

.home-icon {
    position: relative;
    display: block;
    width: 12px;
    height: 12px;
    background-color: var(--ink);
    top: 3px;
}

.clef-btn, .key, #keyboard, #namingSystemSelect, .tools-card, .interval, #home-button {
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.clef-btn, .key, .tools-card, .interval, #home-button {
    transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition);
}

@media (hover:hover) {
    .clef-btn:hover, .key:hover, .interval:hover, #home-button:hover {
        background-color: var(--accent);
        transform: translateY(var(--hover-lift));
        box-shadow: var(--shadow-hover);
    }
}

.clef-btn:active, .key:active, .interval:active, #home-button:active {
    background-color: var(--accent);
    transform: translateY(var(--hover-lift));
    box-shadow: var(--shadow-hover);
}

.tools-card:hover {
    transform: translateY(var(--hover-lift));
    box-shadow: var(--shadow-hover);
}

label, .clef-btn, .key, #namingSystemSelect, .interval {
    letter-spacing: 0.01em;
}

@keyframes notePopCorrect {
    0% { transform: scale(1); }
    50% {transform: scale(1.2); }
    100% {transform: scale(1); }
}

@keyframes notePopWrong {
     0% { transform: scale(1); }
    50% { transform: scale(0.8); }
    100% { transform: scale(1); }
}

.note-group.pop-correct {
    animation: notePopCorrect 0.3s ease;
    transform-origin: center;
    transform-box: fill-box;  
}

.note-group.pop-wrong {
    animation: notePopWrong 0.3s ease;
    transform-origin: center;
    transform-box: fill-box;
}