/* =========================================================
   guestbook.css — 留言板页
   依赖：style.css（需先引入）
   ========================================================= */

.guestbook-main {
    position: relative;
    z-index: 10;
    max-width: 720px;
    margin: 0 auto;
    padding: 130px 60px 80px;
}

.guestbook-main h1 {
    font-size: 38px;
    font-weight: 300;
    letter-spacing: 6px;
    text-align: center;
    margin-bottom: 12px;
    text-shadow: 0 0 12px rgba(255, 255, 255, 0.6);
}

.guestbook-main .subtitle {
    text-align: center;
    font-size: 15px;
    color: rgba(255, 255, 255, 0.55);
    letter-spacing: 2px;
    margin-bottom: 60px;
}

/* 占位卡片 */
.guestbook-placeholder {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 16px;
    padding: 60px 40px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.placeholder-icon {
    font-size: 56px;
    margin-bottom: 20px;
    animation: floatIcon 3s ease-in-out infinite;
}

@keyframes floatIcon {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

.placeholder-title {
    font-size: 22px;
    letter-spacing: 3px;
    color: #ffcc00;
    margin-bottom: 16px;
    text-shadow: 0 0 12px rgba(255, 204, 0, 0.4);
}

.placeholder-desc {
    font-size: 15px;
    line-height: 2;
    color: rgba(255, 255, 255, 0.65);
    letter-spacing: 1px;
    margin-bottom: 28px;
}

.placeholder-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.placeholder-links a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: 10px;
    background: rgba(255, 204, 0, 0.15);
    border: 1px solid rgba(255, 204, 0, 0.35);
    color: #ffcc00;
    text-decoration: none;
    font-size: 14px;
    letter-spacing: 1px;
    transition: background 0.3s, transform 0.3s, border-color 0.3s;
}

.placeholder-links a:hover {
    background: rgba(255, 204, 0, 0.3);
    border-color: #ffcc00;
    transform: translateY(-2px);
}

/* 手机适配 */
@media (max-width: 1024px) {
    .guestbook-main {
        padding: 100px 20px 60px;
    }

    .guestbook-main h1 {
        font-size: 28px;
        letter-spacing: 4px;
    }

    .guestbook-main .subtitle {
        margin-bottom: 40px;
    }

    .guestbook-placeholder {
        padding: 40px 24px;
    }

    .placeholder-icon {
        font-size: 44px;
    }

    .placeholder-title {
        font-size: 18px;
        letter-spacing: 2px;
    }

    .placeholder-desc {
        font-size: 14px;
    }
}