* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
    overflow-x: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

.header {
    text-align: center;
    margin-bottom: 50px;
    animation: fadeInDown 0.8s ease;
}

.main-title {
    font-size: 3.5rem;
    color: white;
    text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.3);
    margin-bottom: 15px;
    font-weight: 800;
}

.emoji {
    display: inline-block;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.subtitle {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 30px;
    font-weight: 300;
}

.search-container {
    position: relative;
    max-width: 500px;
    margin: 0 auto;
}

.search-box {
    width: 100%;
    padding: 15px 50px 15px 20px;
    font-size: 1.1rem;
    border: none;
    border-radius: 50px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    outline: none;
}

.search-box:focus {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.search-icon {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.3rem;
}

.filter-tags {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
    animation: fadeIn 1s ease;
}

.sort-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-bottom: 40px;
    animation: fadeIn 1s ease;
}

.sort-label {
    color: white;
    font-size: 1rem;
    font-weight: 600;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

.sort-select {
    padding: 10px 20px;
    border: none;
    border-radius: 25px;
    background: rgba(255, 255, 255, 0.9);
    color: #667eea;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    outline: none;
}

.sort-select:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    background: white;
}

.sort-select:focus {
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.3);
}

.tag {
    padding: 10px 25px;
    border: none;
    border-radius: 25px;
    background: rgba(255, 255, 255, 0.9);
    color: #667eea;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.tag:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    background: white;
}

.tag.active {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
    animation: fadeInUp 1s ease;
}

.project-card {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.project-card:hover::before {
    transform: scaleX(1);
}

.project-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

/* 모바일에서 hover 효과 제거 (터치 디바이스) */
@media (hover: none) {
    .project-card:hover {
        transform: none;
    }
    
    .tag:hover {
        transform: none;
    }
    
    .sort-select:hover {
        transform: none;
    }
    
    .back-button:hover {
        transform: none;
    }
}

/* 터치 디바이스 최적화 */
@media (pointer: coarse) {
    .tag,
    .sort-select,
    .back-button {
        min-height: 44px; /* 터치 타겟 최소 크기 */
    }
    
    .project-card {
        -webkit-tap-highlight-color: rgba(102, 126, 234, 0.2);
    }
}

.project-number {
    display: inline-block;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.project-status {
    position: absolute;
    top: 15px;
    right: 15px;
    padding: 6px 12px;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    z-index: 10;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    white-space: nowrap;
}

.status-completed {
    background: linear-gradient(135deg, #48bb78, #38a169);
    color: white;
}

.status-good {
    background: linear-gradient(135deg, #4299e1, #3182ce);
    color: white;
}

.status-incomplete {
    background: linear-gradient(135deg, #ed8936, #dd6b20);
    color: white;
}

.status-practice {
    background: linear-gradient(135deg, #9f7aea, #805ad5);
    color: white;
}

.status-default {
    background: linear-gradient(135deg, #718096, #4a5568);
    color: white;
}

.project-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    display: block;
}

.project-title {
    font-size: 1.5rem;
    color: #2d3748;
    margin-bottom: 10px;
    font-weight: 700;
}

.project-description {
    color: #718096;
    line-height: 1.6;
    margin-bottom: 15px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 15px;
}

.project-tag {
    background: #e6f7ff;
    color: #0050b3;
    padding: 5px 12px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
}

.project-date {
    color: #a0aec0;
    font-size: 0.85rem;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid #e2e8f0;
}

.footer {
    text-align: center;
    color: white;
    padding: 30px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    backdrop-filter: blur(10px);
}

.footer p {
    margin: 10px 0;
    font-size: 1.1rem;
}

.project-count {
    font-weight: 700;
    font-size: 1.2rem !important;
}

.footer-description {
    font-size: 0.95rem !important;
    color: rgba(255, 255, 255, 0.9);
    margin-top: 15px !important;
    line-height: 1.6;
}

.footer-note {
    font-size: 0.85rem !important;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 8px !important;
    font-style: italic;
}

.hidden {
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    body {
        padding: 15px;
    }

    .container {
        max-width: 100%;
    }

    .header {
        margin-bottom: 30px;
    }

    .main-title {
        font-size: 2.2rem;
        margin-bottom: 10px;
        line-height: 1.2;
    }

    .subtitle {
        font-size: 1.1rem;
        margin-bottom: 20px;
    }

    .search-container {
        max-width: 100%;
        margin-bottom: 20px;
    }

    .search-box {
        padding: 12px 45px 12px 18px;
        font-size: 1rem;
    }

    .search-icon {
        right: 15px;
        font-size: 1.1rem;
    }

    .filter-tags {
        gap: 8px;
        margin-bottom: 15px;
        padding: 0 10px;
    }

    .tag {
        padding: 8px 16px;
        font-size: 0.9rem;
        flex: 0 0 auto;
    }

    .sort-container {
        margin-bottom: 25px;
        flex-wrap: wrap;
        gap: 8px;
    }

    .sort-label {
        font-size: 0.9rem;
    }

    .sort-select {
        padding: 8px 16px;
        font-size: 0.9rem;
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-bottom: 40px;
    }

    .project-card {
        padding: 25px;
    }

    .project-icon {
        font-size: 2.5rem;
    }

    .project-title {
        font-size: 1.3rem;
    }

    .project-description {
        font-size: 0.95rem;
    }

    .footer {
        padding: 25px 20px;
        margin-top: 20px;
    }

    .footer p {
        font-size: 1rem;
        margin: 8px 0;
    }

    .project-count {
        font-size: 1.1rem !important;
    }

    .footer-description {
        font-size: 0.9rem !important;
        padding: 0 10px;
    }

    .footer-note {
        font-size: 0.8rem !important;
    }

    .iframe-navbar {
        padding: 12px 15px;
        flex-wrap: wrap;
        gap: 10px;
    }

    .back-button {
        padding: 10px 18px;
        font-size: 0.9rem;
    }

    .back-button .back-text {
        display: inline;
    }

    .iframe-project-title {
        font-size: 1rem;
        flex: 1;
        min-width: 0;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    .header {
        margin-bottom: 25px;
    }

    .main-title {
        font-size: 1.8rem;
        margin-bottom: 8px;
    }

    .emoji {
        font-size: 0.9em;
    }

    .subtitle {
        font-size: 0.95rem;
        margin-bottom: 15px;
    }

    .search-box {
        padding: 10px 40px 10px 15px;
        font-size: 0.95rem;
    }

    .search-icon {
        right: 12px;
        font-size: 1rem;
    }

    .filter-tags {
        gap: 6px;
        margin-bottom: 12px;
        padding: 0 5px;
    }

    .tag {
        padding: 7px 12px;
        font-size: 0.85rem;
    }

    .sort-container {
        margin-bottom: 20px;
        gap: 6px;
    }

    .sort-label {
        font-size: 0.85rem;
    }

    .sort-select {
        padding: 7px 14px;
        font-size: 0.85rem;
    }

    .projects-grid {
        gap: 15px;
        margin-bottom: 30px;
    }

    .project-card {
        padding: 20px;
        border-radius: 15px;
    }

    .project-number {
        padding: 6px 12px;
        font-size: 0.85rem;
        margin-bottom: 12px;
    }

    .project-status {
        top: 12px;
        right: 12px;
        padding: 5px 10px;
        font-size: 0.75rem;
    }

    .project-icon {
        font-size: 2.2rem;
        margin-bottom: 12px;
    }

    .project-title {
        font-size: 1.2rem;
        margin-bottom: 8px;
    }

    .project-description {
        font-size: 0.9rem;
        margin-bottom: 12px;
        line-height: 1.5;
    }

    .project-tags {
        gap: 6px;
        margin-top: 12px;
    }

    .project-tag {
        padding: 4px 10px;
        font-size: 0.8rem;
    }

    .project-date {
        font-size: 0.8rem;
        margin-top: 8px;
        padding-top: 8px;
    }

    .footer {
        padding: 20px 15px;
        border-radius: 15px;
    }

    .footer p {
        font-size: 0.9rem;
        margin: 6px 0;
    }

    .project-count {
        font-size: 1rem !important;
    }

    .footer-description {
        font-size: 0.85rem !important;
        line-height: 1.5;
        padding: 0 5px;
    }

    .footer-note {
        font-size: 0.75rem !important;
    }

    .iframe-navbar {
        padding: 10px 12px;
    }

    .back-button {
        padding: 8px 14px;
        font-size: 0.85rem;
        border-radius: 20px;
    }

    .back-icon {
        font-size: 1.1rem;
    }

    .iframe-project-title {
        font-size: 0.9rem;
    }
}

@media (max-width: 360px) {
    body {
        padding: 8px;
    }

    .main-title {
        font-size: 1.6rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    .project-card {
        padding: 18px;
    }

    .project-title {
        font-size: 1.1rem;
    }

    .footer {
        padding: 18px 12px;
    }
}

/* iframe 컨테이너 스타일 */
.iframe-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: white;
    z-index: 1000;
    display: none;
    flex-direction: column;
}

.iframe-container.active {
    display: flex;
}

.iframe-navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 15px 30px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    position: relative;
    z-index: 1001;
}

.back-button {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background: white;
    color: #667eea;
    border: none;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.back-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
    background: #f8f9fa;
}

.back-button:active {
    transform: translateY(0);
}

.back-icon {
    font-size: 1.3rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

.iframe-project-title {
    color: white;
    font-size: 1.3rem;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.project-iframe {
    flex: 1;
    width: 100%;
    border: none;
    background: white;
}

/* 스크롤바 스타일링 */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.5);
}