.overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    display: none;
    align-items: flex-end;
    z-index: 999;
}

.overlay.show {
    display: flex;
    animation: fadeIn 0.22s ease;
}

.sheet {
    width: 100%;
    background: var(--surface);
    border-radius: 16px 16px 0 0;
    padding: 8px 20px calc(24px + var(--safe-bottom));
    animation: slideUp 0.34s cubic-bezier(0.32, 0.72, 0, 1);
    box-shadow: 0 -4px 32px rgba(0, 0, 0, 0.1);
}

.sheet-handle {
    width: 36px;
    height: 5px;
    background: #d1d1d6;
    border-radius: var(--radius-pill);
    margin: 0 auto 24px;
}

.sheet-phone {
    font-size: 30px;
    font-weight: 600;
    letter-spacing: 0.02em;
    margin-bottom: 8px;
    text-align: center;
    color: var(--text);
}

.sheet-label {
    color: var(--muted);
    font-size: 15px;
    text-align: center;
    margin-bottom: 24px;
}

.sheet-btn-link {
    display: block;
    width: 100%;
    background: none;
    border: none;
    color: var(--green);
    font-size: 17px;
    font-weight: 500;
    padding: 14px;
    cursor: pointer;
    text-align: center;
}

.sheet-btn-link:active {
    opacity: 0.65;
}

.sheet-btn-main {
    width: 100%;
    height: 52px;
    background: var(--green);
    color: #fff;
    border: none;
    border-radius: var(--radius-pill);
    font-size: 17px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 4px;
    transition: background 0.15s, transform 0.15s;
}

.sheet-btn-main:active {
    background: var(--green-pressed);
    transform: scale(0.985);
}

.help-box {
    background: var(--surface-secondary);
    border-radius: var(--radius);
    padding: 16px;
    text-align: left;
    margin-bottom: 16px;
}

.help-title {
    font-weight: 600;
    font-size: 15px;
    margin-bottom: 8px;
    color: var(--text);
}

.help-text {
    font-size: 14px;
    color: var(--muted);
    line-height: 1.5;
}