/* ===========================
   프리미엄 기능 섹션
   =========================== */

.premium-features {
    padding: 100px 20px;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    position: relative;
    overflow: hidden;
}

.premium-features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(212, 175, 55, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(44, 95, 79, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.premium-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-top: 50px;
    position: relative;
    z-index: 1;
}

.premium-card {
    background: white;
    border-radius: 20px;
    padding: 40px 30px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    border: 2px solid transparent;
}

.premium-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.1) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.premium-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    border-color: #d4af37;
}

.premium-card:hover::before {
    opacity: 1;
}

/* Featured Card */
.premium-card.featured {
    border: 3px solid #d4af37;
    background: linear-gradient(135deg, #ffffff 0%, #fffef9 100%);
    transform: scale(1.03);
}

.premium-card.featured:hover {
    transform: scale(1.05) translateY(-10px);
}

/* Badge */
.premium-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, #d4af37, #f4d03f);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.4);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* Icon */
.premium-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #2c5f4f, #1a4838);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
    position: relative;
    box-shadow: 0 10px 30px rgba(44, 95, 79, 0.3);
}

.premium-icon::after {
    content: '';
    position: absolute;
    top: -5px;
    right: -5px;
    bottom: -5px;
    left: -5px;
    background: linear-gradient(135deg, #d4af37, #f4d03f);
    border-radius: 22px;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.premium-card:hover .premium-icon::after {
    opacity: 0.3;
}

.premium-icon i {
    font-size: 36px;
    color: #d4af37;
}

/* Title & Description */
.premium-title {
    font-size: 24px;
    font-weight: 700;
    color: #1a4838;
    margin-bottom: 15px;
    line-height: 1.3;
}

.premium-description {
    font-size: 15px;
    color: #666;
    line-height: 1.8;
    margin-bottom: 25px;
}

/* Features List */
.premium-features-list {
    list-style: none;
    padding: 0;
    margin: 0 0 30px 0;
}

.premium-features-list li {
    font-size: 15px;
    color: #444;
    padding: 12px 0;
    border-bottom: 1px solid #f0f0f0;
    display: flex;
    align-items: center;
    transition: all 0.3s ease;
}

.premium-features-list li:last-child {
    border-bottom: none;
}

.premium-features-list li:hover {
    padding-left: 10px;
    color: #2c5f4f;
}

.premium-features-list li i {
    color: #d4af37;
    margin-right: 12px;
    font-size: 14px;
}

/* Button */
.btn-premium {
    display: block;
    width: 100%;
    padding: 16px 32px;
    background: linear-gradient(135deg, #2c5f4f, #1a4838);
    color: white;
    text-align: center;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-premium::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn-premium:hover::before {
    left: 100%;
}

.btn-premium:hover {
    background: linear-gradient(135deg, #1a4838, #2c5f4f);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(44, 95, 79, 0.4);
}

.btn-premium.featured {
    background: linear-gradient(135deg, #d4af37, #f4d03f);
    color: #1a4838;
    font-weight: 700;
}

.btn-premium.featured:hover {
    background: linear-gradient(135deg, #f4d03f, #d4af37);
    box-shadow: 0 10px 30px rgba(212, 175, 55, 0.5);
}

/* Dark Mode */
body.dark-mode .premium-features {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
}

body.dark-mode .premium-card {
    background: #0f3460;
    border-color: rgba(212, 175, 55, 0.3);
}

body.dark-mode .premium-card.featured {
    background: linear-gradient(135deg, #0f3460 0%, #1a4838 100%);
}

body.dark-mode .premium-title {
    color: #d4af37;
}

body.dark-mode .premium-description {
    color: #bbb;
}

body.dark-mode .premium-features-list li {
    color: #ccc;
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

body.dark-mode .premium-features-list li:hover {
    color: #d4af37;
}

/* Responsive */
@media (max-width: 768px) {
    .premium-features {
        padding: 60px 20px;
    }

    .premium-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .premium-card.featured {
        transform: scale(1);
    }

    .premium-card.featured:hover {
        transform: translateY(-10px);
    }

    .premium-icon {
        width: 60px;
        height: 60px;
    }

    .premium-icon i {
        font-size: 28px;
    }

    .premium-title {
        font-size: 20px;
    }

    .premium-description {
        font-size: 14px;
    }

    .premium-features-list li {
        font-size: 14px;
        padding: 10px 0;
    }

    .btn-premium {
        padding: 14px 28px;
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .premium-features {
        padding: 40px 15px;
    }

    .premium-card {
        padding: 30px 20px;
    }

    .premium-icon {
        width: 50px;
        height: 50px;
    }

    .premium-icon i {
        font-size: 24px;
    }

    .premium-title {
        font-size: 18px;
    }

    .premium-badge {
        font-size: 11px;
        padding: 6px 12px;
    }
}