style.css

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

html {
    font-size: 16px;
}

:root {
    --bg-color: #1e1e1e;
    --page-padding: 50px;
    --gap: 30px;
}

body {
    width: 100vw;
    min-height: 100vh;
    background-color: var(--bg-color);
    padding: var(--page-padding);

    font-family: "Aleo", sans-serif;
    color: #fff;
    text-align: center;
}

button {
    font-family: "Aleo", sans-serif;
    border-radius: 1000px;
    padding: 5px;
}

hr {
    width: 100%;
    max-width: 1200px;
    border: 3px solid #555555;
    border-radius: 5px;
    margin: var(--gap) auto;
}

h1 {
    margin: 0 auto;
    width: fit-content;
    padding: 10px 30px;
    background-color: #263726;
    border-radius: 100px;
}

/* INDICATOR */

.indicator {
    display: flex;
    flex-direction: column;
    max-width: 1200px;
    margin: var(--gap) auto;
}

.canvas-container {
    width: 100%;
    height: 150px;
    margin-bottom: calc(var(--gap)/2);
}

.indicator canvas {
    background-color: #343434;
    border-radius: 40px;
    image-rendering: pixelated;
    display: block;
}

#target-note {
    font-size: 2.25rem;
    font-weight: 200;
}

#start-btn, #stop-btn {
    padding: 10px 30px;
    width: fit-content;
    background-color: #F4C41A;
    color: #000;
    border: 2px solid #000;
    font-size: 1rem;
    margin: auto;
}

#stop-btn {
    margin-top: 10px;
    background-color: #e35d5d;
    font-size: 0.85rem;
}

/* STRINGS */

.str-btns, .tunings {
    display: flex;
    justify-content: space-between;
    gap: 30px;
    max-width: 1100px;
    margin: auto;
}

.str-btns button {
    width: 75px;
    height: 75px;
    border-radius: 100%;
    font-size: 1.5rem;

    color: #FFF;
    background-color: #474747;
    border: 2px solid #B4B4B4;
}

.str-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.str-num {
    font-weight: 200;
}

/* TUNING BUTTONS */

.tunings {
    justify-content: flex-start;
    gap: 20px;
    flex-wrap: wrap;
    max-width: 1200px;
}

.tunings button[title="select tuning"], #add-tuning {
    position: relative;
    padding: 10px 30px;
    background-color: #8CB16E;
    color: #000;
    border: none;
    font-size: 1rem;
}

#add-tuning {
    background-color: #F4C41A;
}

/* tuning - delete buttons */
.delete-btn {
    display: none;

    position: absolute;
    right: -10px;
    top: -10px;
    
    background-color: #CA4444;
    border: none;
    color: #FFF;

    font-size: 0.7rem;
    padding: 5px;
    height: calc(0.7rem + 10px);
    aspect-ratio: 1/1;
}

/* CUSTOM TABLE */

.custom-table {
    width: 100%;
    max-width: 1200px;
    min-height: fit-content;
    margin: var(--gap) auto;
}

.custom-table h2 {
    margin-bottom: calc(var(--gap)/2);
}

.custom-container {
    display: flex;
    justify-content: center;
    gap: 40px;
}

.table-options {
    min-height: 100%;
    min-width: 215px;
    background-color: #292929;
    border-radius: 25px;
    padding: calc(var(--gap)/2);

    display: flex;
    flex-direction: column;
    gap: 10px;
}

.table-options h3 {
    margin-bottom: calc(var(--gap)/2 - 10px);
}

.table-options h4 {
    margin-bottom: 5px;
}

.table-options span {
    display: block;
    max-width: calc(215px - var(--gap)/2);
}

.transpose button {
    width: 48%;
    background-color: #8CB16E;
    border: none;
}

.transpose button#t-down {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.transpose button#t-up {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

#reset-custom {
    color: #FFF;
    background-color: #575757;
    border: 2px solid #B4B4B4;
    margin: auto 0;
}

.save {
    margin-top: auto;
}

.save label {
    font-size: 0.875rem;
    width: 100%;
    display: block;
}

.save label span {
    text-align: left;
}

.save input {
    display: block;
    width: 100%;
    margin: 5px 0 10px;
    background-color: transparent;
    border: none;
    border-bottom: 2px solid #555;
    color: #FFF;
    font-family: "Aleo", sans-serif;
}

.save input:focus {
    outline: none;
    border-bottom-color: #F4C41A;
}

.save button {
    width: 100%;
    background-color: #F4C41A;
    border: 2px solid #000;
}

#go-to-tuning {
    background: none;
    border: none;
    padding: 0;
    text-decoration: underline;
    color: #F4C41A;
    width: unset;
    font-size: 1rem;
}

table * {
    font-size: 1rem;
}

th {
    border-bottom: 2px solid #555;
}

tr {
    height: 33px;
}

td button {
    padding: 5px;
    min-width: 45px;
    border: none;
    background-color: transparent;
    color: #FFF;
    cursor: pointer;
}

/* STATES */
.hidden {display: none;}

.show-del {display: block;}

.tunings button[title="select tuning"].active, 
.str-btns .active, 
.tunings .active:active, 
.str-btns .active:active,
td button.active,
td button.active:active {
    background-color: #263726;
    color: #FFF;
    border: 2px solid #8CB16E;
}

.str-btns button:active, td button:active {
    background-color: #7A7A7A;
}

#reset-custom:active {
    background-color: #7A7A7A;
}

.tunings button:active, .transpose button:active {
    background-color: #709552;
}

#start-btn:active, #add-tuning:active, #save-custom:active {
    background-color: #C19100;
}

#add-tuning.active, #add-tuning.active:active {
    color: #FFF;
    background-color: #C19100;
    border: 2px solid #F4C41A;
}

#stop-btn:active {
    background-color: #CA4444;
}

/* MEDIA QUERIES */

@media screen and (max-width: 710px) {
    :root {
        --page-padding: 35px;
    }

    h1 {
        font-size: 1.75rem;
        padding: 5px 15px;
    }

    .str-btns {
        gap: 15px;
    }

    .str-btns button {
        width: 50px;
        height: 50px;
        font-size: 1.2rem
    }

    .tunings {
        gap: 10px;
    }

    .tunings button[title="select tuning"], #add-tuning {
        padding: 5px 15px;
    }

    .indicator canvas {
        border-radius: 25px;
    }
}

@media screen and (max-width: 600px) {
    .custom-container {
        flex-direction: column;
    }
}

@media screen and (max-width: 475px) {
    :root {
        --page-padding: 20px;
        --gap: 15px;
    }

    .str-btns {
        gap: 5px;
    }

    .str-btns button {
        font-size: 1rem;
        width: 40px;
        height: 40px;
    }

    .tunings button[title="select tuning"], table * {
        font-size: 0.75rem;
    }
}