.study-timer {
    bottom: 1rem;
    left: 1rem;
    position: fixed;
    z-index: 430;
}

.study-timer-open {
    align-items: center;
    background: #155e75;
    border: 1px solid rgba(255, 255, 255, .2);
    border-radius: 8px;
    box-shadow: 0 12px 28px rgba(15, 23, 42, .22);
    color: #fff;
    display: inline-flex;
    font-weight: 800;
    gap: .45rem;
    min-height: 2.75rem;
    padding: .55rem .85rem;
}

.study-timer-open:hover {
    background: #0f4f63;
}

.study-timer-open-icon {
    align-items: center;
    background: #f59e0b;
    border-radius: 6px;
    color: #111827;
    display: inline-flex;
    font: 900 .9rem/1 ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
    height: 1.55rem;
    justify-content: center;
    width: 1.85rem;
}

.study-timer-panel {
    background: #fbfaf7;
    border: 1px solid #d8d6cc;
    border-radius: 8px;
    bottom: 3.55rem;
    box-shadow: 0 24px 60px rgba(15, 23, 42, .26);
    color: #1f2937;
    left: 0;
    padding: .85rem;
    position: absolute;
    width: min(340px, calc(100vw - 2rem));
}

.study-timer-panel[hidden] {
    display: none;
}

.study-timer-head {
    align-items: center;
    display: flex;
    gap: .75rem;
    justify-content: space-between;
    margin-bottom: .65rem;
}

.study-timer-head h2 {
    color: #102a43;
    font-size: 1.05rem;
    line-height: 1.25;
    margin: 0;
}

.study-timer-close {
    align-items: center;
    background: #eef2f7;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    color: #334155;
    display: inline-flex;
    font-size: 1.25rem;
    font-weight: 900;
    height: 2.2rem;
    justify-content: center;
    line-height: 1;
    padding: 0;
    width: 2.2rem;
}

.study-timer-close:hover {
    background: #e2e8f0;
}

.study-timer-modes {
    display: grid;
    gap: .4rem;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.study-timer-modes button,
.study-timer-actions button {
    align-items: center;
    background: #fff;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    color: #334155;
    display: inline-flex;
    font-size: .82rem;
    font-weight: 800;
    justify-content: center;
    min-height: 2.3rem;
    min-width: 0;
    padding: .35rem .45rem;
}

.study-timer-modes button:hover,
.study-timer-actions button:hover {
    background: #eef6ff;
    border-color: #93c5fd;
}

.study-timer-modes button.is-active {
    background: #e0f2fe;
    border-color: #155e75;
    color: #155e75;
}

.study-timer-display {
    background: #102a43;
    border-radius: 8px;
    color: #fff;
    display: block;
    font: 900 2.45rem/1 ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
    margin-top: .7rem;
    min-height: 4.4rem;
    padding: .95rem .8rem;
    text-align: center;
}

.study-timer-status {
    color: #64748b;
    display: block;
    font-size: .86rem;
    font-weight: 800;
    min-height: 1.25rem;
    padding-top: .45rem;
    text-align: center;
}

.study-timer.is-complete .study-timer-display {
    background: #166534;
}

.study-timer-actions {
    display: grid;
    gap: .4rem;
    grid-template-columns: 1.2fr repeat(3, minmax(0, 1fr));
    margin-top: .7rem;
}

.study-timer-actions .study-timer-primary {
    background: #15803d;
    border-color: #15803d;
    color: #fff;
}

.study-timer-actions .study-timer-primary:hover {
    background: #166534;
    border-color: #166534;
}

@media (max-width: 520px) {
    .study-timer {
        bottom: .75rem;
        left: .75rem;
    }

    .study-timer-open {
        min-height: 2.55rem;
        padding: .45rem .65rem;
    }

    .study-timer-panel {
        bottom: 3.2rem;
    }

    .study-timer-modes,
    .study-timer-actions {
        grid-template-columns: 1fr;
    }
}