header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.logo {
    width: 40%;
    min-width: 150px;
    height: auto;
}

.brand {
    font-family: 'Grenze', serif;
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    text-align: center;
}

.muted {
    color: var(--muted);
    font-size: 0.85rem;
    margin-top: 2px;
    text-align: center;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

a.back {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.9rem;
    transition: opacity 0.15s;
}

a.back:hover {
    opacity: 0.7;
}

main {
    flex: 1;
    width: 100%;
    max-width: 680px;
    margin: 0 auto;
    padding: 2.5rem 2rem;
}

.mode-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.mode-label {
    font-size: 0.8rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.toggle-wrap {
    display: flex;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 3px;
    gap: 3px;
}

.toggle-btn {
    background: transparent;
    border: none;
    color: var(--muted);
    padding: 0.45rem 1rem;
    border-radius: 7px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.82rem;
    letter-spacing: 0.04em;
    transition: 0.15s ease;
}

.toggle-btn.active {
    background: var(--accent-dim);
    color: var(--accent);
    border: 1px solid rgba(88, 166, 255, 0.3);
}

.toggle-btn:hover:not(.active) {
    color: var(--text);
}

.card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 2rem;
}

#panel-s2hms {
    display: none;
}

.card-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
    margin-bottom: 1.5rem;
}

.fields {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.field-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.field-label {
    width: 80px;
    font-size: 0.8rem;
    color: var(--muted);
    text-align: right;
    flex-shrink: 0;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.field-input {
    flex: 1;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    font-family: inherit;
    font-size: 1.1rem;
    padding: 0.65rem 1rem;
    outline: none;
    transition: border-color 0.15s;
    -moz-appearance: textfield;
}

.field-input::-webkit-outer-spin-button,
.field-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
}

.field-input:focus {
    border-color: var(--accent);
}

.field-unit {
    width: 28px;
    font-size: 0.75rem;
    color: var(--muted);
    flex-shrink: 0;
}

.single-field {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.single-field .field-input {
    font-size: 1.3rem;
}

.divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.75rem 0;
}

.divider-line {
    flex: 1;
    height: 1px;
    background: var(--border);
}

.divider-icon {
    color: var(--muted);
    font-size: 1.1rem;
    user-select: none;
    animation: bounce 1.6s ease-in-out infinite;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(3px);
    }
}

.result-box {
    background: var(--success-dim);
    border: 1px solid rgba(63, 185, 80, 0.25);
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--success);
    letter-spacing: -0.02em;
    line-height: 1;
}

.result-unit {
    font-size: 0.85rem;
    color: var(--muted);
}

.result-box.empty {
    background: var(--panel-2);
    border-color: var(--border);
}

.result-box.empty .result-value {
    color: var(--muted);
    font-size: 1.2rem;
    font-weight: 400;
}

.actions {
    display: flex;
    gap: 0.6rem;
    margin-top: 1.25rem;
}

.btn {
    background: var(--panel-2);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 0.55rem 1rem;
    border-radius: 10px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.82rem;
    letter-spacing: 0.04em;
    transition: 0.15s ease;
}

.btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-copy {
    margin-left: auto;
}

.btn-copy.copied {
    border-color: var(--success);
    color: var(--success);
}

.history-wrap {
    margin-top: 1.75rem;
    display: none;
}

.history-title {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
    margin-bottom: 0.75rem;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.5rem 0.85rem;
    font-size: 0.82rem;
    color: var(--muted);
    animation: slideIn 0.2s ease;
    cursor: pointer;
    transition: border-color 0.12s;
}

.history-item:hover {
    border-color: var(--accent);
    color: var(--text);
}

.history-item .hi-from {
    color: var(--text);
}

.history-item .hi-arrow {
    margin: 0 0.5rem;
}

.history-item .hi-to {
    color: var(--success);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

footer {
    border-top: 1px solid var(--border);
    padding: 1rem 2rem;
    color: var(--muted);
    font-size: 0.8rem;
    text-align: center;
}