/* ===== 情书区 ===== */
#letter {
    padding: 100px 0;
}

.letter-container {
    display: flex;
    justify-content: center;
}

.letter-paper {
    position: relative;
    max-width: 600px;
    width: 100%;
    background: linear-gradient(145deg, #1e1e2e 0%, #16162a 100%);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-lg);
    padding: 48px 40px;
    box-shadow: var(--shadow-card);
    overflow: hidden;
}

.letter-decoration {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-main);
}

.letter-content {
    position: relative;
    z-index: 1;
}

.letter-line {
    font-family: var(--font-handwrite);
    font-size: 1.15rem;
    line-height: 2.2;
    color: var(--text-primary);
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.6s ease;
    margin-bottom: 4px;
}

.letter-line.visible {
    opacity: 1;
    transform: translateY(0);
}

.letter-sign {
    margin-top: 24px;
    text-align: right;
    font-size: 1.3rem;
    color: var(--accent-pink);
}

.letter-stamp {
    position: absolute;
    bottom: 24px;
    right: 32px;
    border: 2px dashed rgba(251, 191, 36, 0.3);
    border-radius: var(--radius-sm);
    padding: 8px 16px;
    transform: rotate(-5deg);
}

.stamp-date {
    font-family: var(--font-display);
    font-size: 0.8rem;
    color: var(--accent-gold);
    letter-spacing: 1px;
}

/* 信纸装饰角 */
.letter-paper::before,
.letter-paper::after {
    content: '';
    position: absolute;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    opacity: 0.03;
}

.letter-paper::before {
    top: -20px;
    left: -20px;
    background: var(--accent-pink);
}

.letter-paper::after {
    bottom: -20px;
    right: -20px;
    background: var(--accent-purple);
}

/* 留言区 */
.guestbook-form {
    max-width: 500px;
    margin: 0 auto 48px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.guest-input,
.guest-textarea {
    width: 100%;
    padding: 14px 20px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-serif);
    font-size: 0.95rem;
    outline: none;
    transition: all 0.3s ease;
    resize: none;
}

.guest-input:focus,
.guest-textarea:focus {
    border-color: var(--accent-pink);
    box-shadow: 0 0 20px rgba(231, 76, 111, 0.1);
}

.guest-textarea {
    min-height: 100px;
}

.guest-submit {
    align-self: flex-end;
    padding: 10px 32px;
    background: var(--gradient-warm);
    border: none;
    border-radius: var(--radius-sm);
    color: #fff;
    font-size: 0.95rem;
    cursor: pointer;
    letter-spacing: 2px;
    transition: all 0.3s ease;
}

.guest-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(231, 76, 111, 0.3);
}

.guest-submit:active {
    transform: translateY(0);
}

.guestbook-list {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.guestbook-item {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: var(--radius-md);
    padding: 20px;
    animation: fadeInUp 0.5s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.guest-nickname {
    font-weight: 600;
    color: var(--accent-rose);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.guest-content {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

.guest-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 8px;
}