body {
    padding: 2rem 1rem 4rem;
}

.header {
    margin-bottom: 2rem;
}

.pomodoro-shell {
    display: grid;
    gap: 18px;
}

.mode-tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    padding: 6px;
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.mode-tab {
    min-height: 38px;
    border: 1px solid transparent;
    border-radius: calc(var(--radius) - 2px);
    background: transparent;
    color: var(--text-dim);
    font: inherit;
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.mode-tab:hover {
    color: var(--text);
    border-color: var(--border);
}

.mode-tab.active {
    background: var(--bg3);
    border-color: var(--border-hover);
    color: var(--text-bright);
}

.timer-panel {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 18px 22px;
}

.timer-ring {
    width: min(76vw, 320px);
    aspect-ratio: 1;
    margin: 0 auto;
    position: relative;
}

.ring-svg {
    width: 100%;
    height: 100%;
    display: block;
    transform: rotate(-90deg);
}

.ring-track,
.ring-progress {
    fill: none;
    stroke-width: 9;
}

.ring-track {
    stroke: var(--border);
}

.ring-progress {
    stroke: var(--accent);
    stroke-linecap: round;
    stroke-dasharray: 603.185;
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 0.35s linear, stroke 0.2s;
}

.timer-ring.running .ring-progress {
    stroke: var(--ok);
}

.timer-face {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.mode-label {
    color: var(--accent);
    font-size: 0.78rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.time-display {
    color: var(--text-bright);
    font-size: clamp(3rem, 14vw, 5rem);
    line-height: 1;
    letter-spacing: 0;
    margin: 12px 0;
    font-variant-numeric: tabular-nums;
}

.session-line {
    color: var(--text-dim);
    font-size: 0.8rem;
    letter-spacing: 0.08em;
}

.controls {
    display: grid;
    grid-template-columns: 44px 1fr 44px;
    gap: 10px;
    align-items: center;
    margin-top: 24px;
}

.icon-btn,
.primary-btn {
    min-height: 44px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg3);
    color: var(--text);
    font: inherit;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.primary-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.icon-btn:hover,
.primary-btn:hover {
    background: var(--bg2);
    border-color: var(--border-hover);
    color: var(--text-bright);
}

.icon-btn svg,
.primary-btn svg {
    width: 17px;
    height: 17px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.primary-btn svg polygon {
    fill: currentColor;
    stroke: none;
}

.settings-panel {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.setting-field {
    display: grid;
    gap: 6px;
    color: var(--accent);
    font-size: 0.68rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.setting-field input {
    width: 100%;
    min-height: 42px;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg2);
    color: var(--text);
    font: inherit;
    font-size: 0.92rem;
    text-align: center;
}

.setting-field input:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

@media (max-width: 560px) {
    body {
        padding-top: 1.5rem;
    }

    .settings-panel {
        grid-template-columns: repeat(2, 1fr);
    }

    .timer-panel {
        padding: 22px 12px 18px;
    }
}