/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --pink: #ffb6c1;
    --pink-light: #ffd9e0;
    --pink-dark: #ff8fa3;
    --blue: #87ceeb;
    --blue-light: #b8e2f2;
    --blue-dark: #5fb8d9;
    --white: #ffffff;
    --bg-color: #fef8fa;
    --card-bg: #ffffff;
    --text-primary: #5a4a6a;
    --text-secondary: #8b7a9e;
    --border-color: #f0e6f0;
    --success-color: #7ed3b2;
    --danger-color: #ff9b9b;
    --shadow-soft: 0 4px 20px rgba(255, 182, 193, 0.25);
    --shadow-hover: 0 8px 30px rgba(255, 182, 193, 0.35);
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, #fff0f5 0%, #f0f8ff 50%, #fff5f8 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部样式 */
header {
    text-align: center;
    padding: 50px 20px;
    background: linear-gradient(135deg, rgba(255, 182, 193, 0.2) 0%, rgba(135, 206, 235, 0.2) 100%);
    border-radius: 30px;
    margin-bottom: 25px;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.5);
}

header h1 {
    font-size: 3.5rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--pink-dark) 0%, var(--blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(2px 2px 4px rgba(255, 182, 193, 0.3));
}

.subtitle {
    font-size: 1.3rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* 导航链接 */
.nav-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 25px 0;
}

.nav-links a {
    padding: 14px 35px;
    background: var(--white);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 50px;
    transition: all 0.3s ease;
    border: 2px solid var(--border-color);
    font-weight: 600;
    font-size: 1rem;
}

.nav-links a:hover {
    background: var(--pink-light);
    border-color: var(--pink);
    transform: translateY(-3px);
    box-shadow: var(--shadow-soft);
}

.nav-links a.active {
    background: linear-gradient(135deg, var(--pink) 0%, var(--blue) 100%);
    color: var(--white);
    border-color: transparent;
    box-shadow: var(--shadow-soft);
}

/* 主内容区域 */
main {
    background: var(--card-bg);
    border-radius: 30px;
    padding: 40px;
    box-shadow: var(--shadow-soft);
    margin: 20px 0;
    border: 2px solid rgba(255, 182, 193, 0.2);
}

/* 表单样式 */
.form-group {
    margin-bottom: 30px;
}

.form-group label {
    display: block;
    margin-bottom: 12px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1.1rem;
}

textarea {
    width: 100%;
    padding: 18px;
    border: 3px solid var(--border-color);
    border-radius: 20px;
    font-size: 16px;
    font-family: inherit;
    resize: vertical;
    transition: all 0.3s ease;
    background: var(--bg-color);
}

textarea:focus {
    outline: none;
    border-color: var(--pink);
    background: var(--white);
    box-shadow: 0 0 0 4px rgba(255, 182, 193, 0.2);
}

textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.char-count {
    text-align: right;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 8px;
}

/* 文件上传区域 */
.upload-area {
    border: 3px dashed var(--pink-light);
    border-radius: 25px;
    padding: 45px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, rgba(255, 182, 193, 0.05) 0%, rgba(135, 206, 235, 0.05) 100%);
}

.upload-area:hover {
    border-color: var(--pink);
    background: linear-gradient(135deg, rgba(255, 182, 193, 0.12) 0%, rgba(135, 206, 235, 0.12) 100%);
    transform: scale(1.01);
}

.upload-area.dragover {
    border-color: var(--pink-dark);
    background: linear-gradient(135deg, rgba(255, 182, 193, 0.2) 0%, rgba(135, 206, 235, 0.2) 100%);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 15px;
}

.upload-area p {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin: 5px 0;
}

.upload-hint {
    color: var(--text-secondary) !important;
    font-size: 0.95rem !important;
    margin-top: 10px !important;
}

/* 文件预览 */
.preview-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 15px;
    margin: 25px 0;
}

.preview-item {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    border: 3px solid var(--pink-light);
}

.preview-item img,
.preview-item video {
    width: 100%;
    height: 140px;
    object-fit: cover;
    display: block;
}

.preview-remove {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.preview-remove:hover {
    transform: scale(1.15);
    background: #ff7b7b;
}

/* ===== 超可爱大按钮 ===== */
.form-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 35px;
    flex-wrap: wrap;
}

.btn {
    padding: 16px 35px;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-secondary {
    background: var(--white);
    color: var(--text-secondary);
    border: 3px solid var(--border-color);
    min-width: 140px;
}

.btn-secondary:hover {
    background: var(--blue-light);
    border-color: var(--blue);
    color: var(--text-primary);
    transform: translateY(-3px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--pink) 0%, var(--blue) 100%);
    color: var(--white);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-soft);
}

/* 超大可爱提交按钮 */
.btn-submit {
    background: linear-gradient(135deg, var(--pink) 0%, var(--pink-dark) 50%, var(--blue) 100%);
    background-size: 200% 200%;
    color: var(--white);
    padding: 22px 55px;
    font-size: 1.4rem;
    min-width: 260px;
    border-radius: 60px;
    box-shadow: 0 6px 25px rgba(255, 143, 163, 0.4);
    position: relative;
    overflow: hidden;
    animation: gradient-shift 3s ease infinite;
}

@keyframes gradient-shift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.btn-submit::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s ease;
}

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

.btn-submit:hover {
    transform: translateY(-5px) scale(1.03);
    box-shadow: 0 10px 35px rgba(255, 143, 163, 0.5);
}

.btn-submit:active {
    transform: translateY(-2px) scale(1.01);
}

.btn-submit .btn-text {
    position: relative;
    z-index: 1;
}

.btn-submit .btn-icon {
    font-size: 1.5rem;
    position: relative;
    z-index: 1;
    transition: transform 0.3s ease;
}

.btn-submit:hover .btn-icon {
    transform: translateX(8px);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* 消息提示 */
.message {
    margin-top: 25px;
    padding: 18px 25px;
    border-radius: 20px;
    display: none;
    font-weight: 600;
    font-size: 1.05rem;
}

.message.show {
    display: block;
    animation: bounce-in 0.4s ease;
}

@keyframes bounce-in {
    0% { opacity: 0; transform: scale(0.9) translateY(-10px); }
    50% { transform: scale(1.02); }
    100% { opacity: 1; transform: scale(1) translateY(0); }
}

.message.success {
    background: linear-gradient(135deg, rgba(126, 211, 178, 0.2) 0%, rgba(135, 206, 235, 0.2) 100%);
    color: #3d8b6e;
    border: 2px solid var(--success-color);
}

.message.error {
    background: linear-gradient(135deg, rgba(255, 155, 155, 0.2) 0%, rgba(255, 182, 193, 0.2) 100%);
    color: #c45c5c;
    border: 2px solid var(--danger-color);
}

/* ===== 展示页面 ===== */
.stats {
    display: flex;
    gap: 25px;
    justify-content: center;
    margin-bottom: 35px;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
    padding: 25px 45px;
    background: linear-gradient(135deg, rgba(255, 182, 193, 0.15) 0%, rgba(135, 206, 235, 0.15) 100%);
    border-radius: 25px;
    border: 2px solid rgba(255, 182, 193, 0.3);
}

.stat-label {
    display: block;
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 8px;
    font-weight: 500;
}

.stat-value {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--pink-dark) 0%, var(--blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.checkins-list {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.checkin-card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(255, 248, 250, 0.9) 100%);
    border-radius: 25px;
    padding: 28px;
    box-shadow: var(--shadow-soft);
    border: 2px solid rgba(255, 182, 193, 0.2);
    transition: all 0.3s ease;
}

.checkin-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(255, 182, 193, 0.4);
}

.checkin-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 18px;
    padding-bottom: 15px;
    border-bottom: 2px dashed var(--pink-light);
}

.checkin-id {
    font-weight: 800;
    font-size: 1.2rem;
    background: linear-gradient(135deg, var(--pink-dark) 0%, var(--blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.checkin-time-group {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 5px;
}

.checkin-time-relative {
    color: var(--pink-dark);
    font-size: 1rem;
    font-weight: 700;
}

.checkin-time-absolute {
    color: var(--text-secondary);
    font-size: 0.88rem;
}

.checkin-content {
    margin: 18px 0;
    line-height: 1.9;
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 1.05rem;
    color: var(--text-primary);
}

.checkin-content a {
    color: var(--blue-dark);
    text-decoration: none;
    border-bottom: 2px solid var(--blue-light);
    transition: all 0.2s ease;
    font-weight: 500;
}

.checkin-content a:hover {
    color: var(--pink-dark);
    border-color: var(--pink);
}

.checkin-media {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 15px;
    margin-top: 18px;
}

.media-item {
    border-radius: 18px;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    cursor: pointer;
    transition: all 0.3s ease;
    border: 3px solid var(--pink-light);
}

.media-item:hover {
    transform: scale(1.04);
    box-shadow: var(--shadow-hover);
}

.media-item img,
.media-item video {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 35px;
    flex-wrap: wrap;
}

.pagination button {
    padding: 12px 22px;
    border: 3px solid var(--pink-light);
    background: var(--white);
    color: var(--text-primary);
    border-radius: 50px;
    cursor: pointer;
    font-weight: 700;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.pagination button:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--pink) 0%, var(--blue) 100%);
    color: var(--white);
    border-color: transparent;
    transform: translateY(-3px);
    box-shadow: var(--shadow-soft);
}

.pagination button.active {
    background: linear-gradient(135deg, var(--pink) 0%, var(--blue) 100%);
    color: var(--white);
    border-color: transparent;
    box-shadow: var(--shadow-soft);
}

.pagination button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 50px;
    color: var(--text-secondary);
    font-size: 1.2rem;
    font-weight: 500;
}

/* 图片模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(90, 74, 106, 0.95);
    animation: fade-in 0.3s ease;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    border-radius: 15px;
    box-shadow: 0 10px 50px rgba(0,0,0,0.3);
}

.modal-close {
    position: absolute;
    top: 25px;
    right: 45px;
    color: var(--white);
    font-size: 45px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.modal-close:hover {
    color: var(--pink);
    transform: rotate(90deg);
}

/* 底部 */
footer {
    text-align: center;
    padding: 30px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    header h1 {
        font-size: 2.5rem;
    }

    main {
        padding: 25px;
        border-radius: 25px;
    }

    .nav-links {
        flex-direction: column;
        align-items: stretch;
    }

    .nav-links a {
        text-align: center;
    }

    .form-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .btn-submit {
        min-width: auto;
        padding: 20px 40px;
        font-size: 1.25rem;
    }

    .preview-container,
    .checkin-media {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }

    .stats {
        gap: 15px;
    }

    .stat-item {
        flex: 1;
        min-width: 130px;
        padding: 20px 25px;
    }

    .stat-value {
        font-size: 2rem;
    }

    .checkin-header {
        flex-direction: column;
        gap: 10px;
    }

    .checkin-time-group {
        align-items: flex-start;
    }
}