/* 时光邮局页面 */
.planet-hero {
    min-height: 60vh;
    display: flex;
    align-items: center;
    padding: 4rem 2rem;
}

.planet-hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
}

.hero-planet {
    display: flex;
    justify-content: center;
}

.planet-visual {
    position: relative;
    width: 280px;
    height: 280px;
}

.mailbox-core {
    background: radial-gradient(circle at 35% 35%, #FFD700, #FF8C00) !important;
    filter: drop-shadow(0 0 60px #FFD700) drop-shadow(0 0 30px #FF8C00) !important;
}

.planet-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotateX(75deg);
    width: 260px;
    height: 70px;
    border: 3px solid var(--gold);
    border-radius: 50%;
    opacity: 0.6;
    box-shadow: 0 0 30px var(--gold);
}

.planet-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 330px;
    height: 330px;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.2), transparent 70%);
    border-radius: 50%;
    animation: pulse-large 3s ease-in-out infinite;
}

@keyframes pulse-large {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-50%, -50%) scale(1.15); }
}

.hero-text {
    padding: 2rem;
}

.planet-title {
    font-size: 3.5rem;
    color: var(--gold);
    margin-bottom: 1.5rem;
}

.planet-desc {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 2rem;
}

.planet-stats {
    display: flex;
    gap: 2rem;
}

.planet-stats span {
    font-size: 1.1rem;
    color: var(--cosmic-teal);
    background: rgba(46, 196, 182, 0.15);
    padding: 0.8rem 1.5rem;
    border-radius: 20px;
    border: 1px solid rgba(46, 196, 182, 0.3);
}

/* 邮局主要区域 */
.mailbox-section {
    padding: 4rem 2rem;
}

.section-subtitle {
    font-size: 2rem;
    color: var(--gold);
    margin-bottom: 2.5rem;
    text-align: center;
}

/* 写信表单 */
.write-letter {
    background: rgba(30, 27, 60, 0.7);
    border: 2px solid rgba(255, 215, 0, 0.3);
    border-radius: 30px;
    padding: 3rem;
    margin-bottom: 5rem;
    backdrop-filter: blur(10px);
}

.letter-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.form-group {
    grid-column: span 1;
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-size: 1rem;
    color: var(--gold);
    margin-bottom: 0.8rem;
    font-weight: 600;
}

.form-input,
.form-textarea {
    padding: 1rem;
    background: rgba(10, 17, 40, 0.8);
    border: 2px solid rgba(255, 215, 0, 0.3);
    border-radius: 15px;
    color: white;
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--gold);
    background: rgba(10, 17, 40, 1);
    box-shadow: 0 0 20px rgba(255, 215, 0, 0.2);
}

.form-textarea {
    grid-column: 1 / -1;
    resize: vertical;
    min-height: 150px;
}

.submit-btn {
    grid-column: 1 / -1;
    padding: 1.2rem 2rem;
    background: linear-gradient(135deg, var(--gold), #FF8C00);
    border: none;
    border-radius: 20px;
    color: #0A1128;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
}

.submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(255, 215, 0, 0.4);
}

/* 信件集合 */
.letters-collection {
    max-width: 1200px;
    margin: 0 auto;
}

.letters-group {
    margin-bottom: 5rem;
}

.group-title {
    font-size: 1.8rem;
    color: var(--cosmic-purple);
    margin-bottom: 2.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid rgba(123, 104, 238, 0.3);
}

.letters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2.5rem;
}

.letter-card {
    background: rgba(30, 27, 60, 0.7);
    border: 2px solid rgba(255, 215, 0, 0.3);
    border-radius: 25px;
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.letter-card:hover {
    transform: translateY(-15px);
    border-color: var(--gold);
    box-shadow: 0 20px 60px rgba(255, 215, 0, 0.3);
}

.letter-envelope {
    height: 280px;
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.1), rgba(255, 140, 0, 0.1));
    border-bottom: 3px solid rgba(255, 215, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.envelope-front {
    text-align: center;
    z-index: 1;
}

.envelope-to {
    display: block;
    font-size: 1.2rem;
    color: var(--gold);
    margin-bottom: 1rem;
    font-weight: 600;
}

.envelope-icon {
    font-size: 4rem;
    display: block;
    animation: float 4s ease-in-out infinite;
}

.letter-card.sealed .envelope-front::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 215, 0, 0.2) 50%, transparent 70%);
}

.letter-card.opened .envelope-front {
    position: relative;
}

.letter-content-preview {
    position: absolute;
    inset: 0;
    padding: 2rem;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.1), rgba(255, 215, 0, 0.2));
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s;
}

.letter-card.opened:hover .letter-content-preview {
    opacity: 1;
}

.letter-content-preview p {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.8);
    text-align: center;
    line-height: 1.6;
    font-style: italic;
}

.opened-envelope {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    filter: drop-shadow(inset 0 0 20px rgba(0, 0, 0, 0.3));
}

.letter-info {
    padding: 1.5rem;
}

.letter-title {
    font-size: 1.3rem;
    color: var(--gold);
    margin-bottom: 0.8rem;
}

.letter-date {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1rem;
    display: block;
}

.countdown {
    font-size: 0.9rem;
    color: var(--cosmic-teal);
    background: rgba(46, 196, 182, 0.15);
    padding: 0.5rem 1rem;
    border-radius: 15px;
    display: inline-block;
    margin-bottom: 1rem;
}

.reread-btn {
    width: 100%;
    padding: 0.8rem;
    background: linear-gradient(135deg, var(--cosmic-purple), var(--pink));
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s;
}

.reread-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(123, 104, 238, 0.3);
}

/* 邮局统计 */
.mailbox-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    margin-top: 6rem;
    padding: 3rem 0;
}

.stat-card {
    background: rgba(30, 27, 60, 0.7);
    border: 2px solid rgba(255, 215, 0, 0.3);
    border-radius: 25px;
    padding: 2.5rem;
    text-align: center;
    transition: all 0.4s ease;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.stat-card:hover {
    transform: translateY(-10px);
    border-color: var(--gold);
    box-shadow: 0 15px 40px rgba(255, 215, 0, 0.3);
}

.stat-icon {
    font-size: 3rem;
}

.stat-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-num {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gold);
    text-shadow: 0 0 20px rgba(255, 215, 0, 0.5);
}

.stat-label {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.7);
}

/* 响应式 */
@media (max-width: 1024px) {
    .planet-hero .container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .letter-form {
        grid-template-columns: 1fr;
    }

    .form-textarea {
        grid-column: 1;
    }
}

@media (max-width: 768px) {
    .planet-hero {
        padding: 3rem 1.5rem;
    }

    .planet-title {
        font-size: 2.5rem;
    }

    .write-letter {
        padding: 2rem 1.5rem;
    }

    .mailbox-section {
        padding: 2rem 1.5rem;
    }

    .letters-grid {
        grid-template-columns: 1fr;
    }

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