/* Reset and base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Container responsive */
.container {
    max-width: calc(100% - 50px);
    margin: 0 auto;
    padding: 0 10px;
}

/* Grid layouts */
.grid-24 {
    grid-template-areas:
        "a h c c"
        "b i c c"
        "d e c c"
        "d f c c"
        "d g c c"
        "o o c c";
}

.grid-3 {
    grid-template-areas:
        "a b c";
}

.grid-4 {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 2.5fr;
    grid-template-areas:
        "a d"
        "b d";
    gap: 20px;
}

.interval-grid-container {
    grid-template-columns: 1fr 1fr 1fr;
}

/* Card base styles */
.card {
    background: var(--bg-light);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--glass);
    overflow: hidden;
}

.card h3 {
    font-size: 1.1em;
    margin-bottom: 12px;
    color: var(--accent-blue);
}

/* Scale formula responsive */
.scale-formula {
    list-style: none;
    padding: 0;
}

.scale-li {
    padding: 8px 0;
    font-size: 0.9em;
    word-break: break-word;
    line-height: 1.6;
}

/* Interval list responsive */
.interval-list {
    list-style: none;
    padding: 0;
    display: grid;
    gap: 15px;
}

.interval-li {
    background: var(--glass);
    border-radius: 8px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 6px;
}

.interval-li span:first-child {
    font-weight: bold;
    color: var(--accent-blue);
    font-size: 1.1em;
}

.interval-name {
    font-size: 0.9em;
    color: var(--text-white);
}

#keyboard:not(.active) {
    display: none !important;
}

.playable-scale {
    transition: color 0.2s ease, transform 0.2s ease;
}
.playable-scale:hover {
    cursor: pointer;
    color: var(--accent-blue);
    transform: translateX(4px);
}

/* Tab navigation responsive */
.tab-nav {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 26px;
    margin-bottom: 26px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 10px 18px;
    background: transparent;
    border: 1px solid var(--glass);
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 10px;
    font-size: 0.98em;
    transition: all 220ms cubic-bezier(0.2, 0.9, 0.32, 1);
    backdrop-filter: blur(6px);
}

.tab-btn:hover {
    transform: translateY(0);
}

.tab-btn.active {
    background: var(--glass);
    border: 1px solid var(--accent-blue);
    color: var(--accent-blue);
}

/* Tabs content */
.tab-content {
    display: none;
    animation: fadeIn 420ms ease both;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive breakpoints */

/* Tablet and below (max-width: 900px) */
@media (max-width: 900px) {
    .grid-4 {
        grid-template-columns: 1fr;
        grid-template-areas:
            "a"
            "b"
            "d";
    }

    .interval-grid-container {
        grid-template-columns: 1fr 1fr;
    }

    .container {
        max-width: calc(100% - 30px);
    }

    h1 {
        font-size: 1.8em;
    }
    .grid-3 {
        grid-template-areas:
            "a"
            "b"
            "c";
    }

    .grid-24 {
        display: flex;
        flex-direction: column;
    }

    #keyboard custom-keyboard {
        width: 100% !important;
    }
}

/* Mobile landscape (max-width: 600px) */
@media (max-width: 600px) {
    #dynamic-root-24, #dynamic-mode-24, #play-dynamic-scale-24 {
        min-width: 100% !important;
        justify-content: center;
    }

    .interval-list-2 {
        column-count: 1 !important;
    }

    #dynamic-scale-notes-24 span {
        padding: 8px 12px !important;
        font-size: 0.9em;
    }

    .grid-4 {
        gap: 15px;
    }

    .card {
        padding: 15px;
    }

    .interval-grid-container {
        grid-template-columns: 1fr;
    }

    .tab-nav {
        gap: 8px;
        margin-top: 20px;
        margin-bottom: 20px;
    }

    .tab-btn {
        padding: 8px 14px;
        font-size: 0.9em;
    }

    h1 {
        font-size: 1.5em;
    }

    .scale-li {
        font-size: 0.85em;
    }

    #keyboard custom-keyboard[layout="isomorphic"] {
        height: 300px !important;
    }

    #keyboard custom-keyboard:not([layout="isomorphic"]) {
        height: 150px !important;
    }
}

/* Small mobile (max-width: 400px) */
@media (max-width: 400px) {
    .container {
        max-width: calc(100% - 20px);
        padding: 0 8px;
    }

    h1 {
        font-size: 1.3em;
    }

    .tab-btn {
        padding: 7px 12px;
        font-size: 0.85em;
    }

    .card h3 {
        font-size: 1em;
    }

    #keyboard custom-keyboard[layout="isomorphic"] {
        height: 220px !important;
    }
}