/* ===== 全局重置 & 液态玻璃变量 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    -webkit-tap-highlight-color: transparent !important;
    outline: none !important;
    user-select: none !important;
}

/* 固定背景层 */
.bg-fixed-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: background-image 0.3s ease;
    will-change: transform;
}

body {
    background: transparent !important;
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 16px 12px 100px;
}

:root {
    --accent: #1e6fff;
    --text-primary: #1e2022;
    --text-secondary: #6b7c93;
    --danger: #e53e3e;
    --success: #38a169;
    --glass-bg: rgba(255, 255, 255, 0.22);
    --glass-border: rgba(255, 255, 255, 0.4);
    --glass-blur: saturate(120%) blur(12px);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.06), inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.app-container {
    max-width: 560px;
    width: 100%;
}

.main-content {
    transition: opacity 0.25s ease, transform 0.25s ease;
    transform: translateX(0);
}

/* ===== 底部导航 Dock ===== */
.bottom-bar {
    position: fixed;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    width: fit-content;
    max-width: calc(100% - 40px);
    height: 60px;
    background: rgba(255, 255, 255, 0.22);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-radius: 28px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.4);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 28px;
    z-index: 100;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.bar-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 10px;
    flex: none;
    padding: 0 16px;
    cursor: pointer;
    transition: color 0.2s, transform 0.2s ease;
}

.bar-item i {
    font-size: 22px;
    margin-bottom: 2px;
    transition: transform 0.2s ease;
}

.bar-item.active {
    color: var(--accent);
    transform: translateY(-2px);
}

.bar-item.active i {
    transform: scale(1.1);
}

.bottom-bar.hidden {
    transform: translateX(-50%) translateY(120px);
    opacity: 0;
    pointer-events: none;
}

/* ===== 液态玻璃卡片 ===== */
.card,
.home-card,
.praise-card,
.sign-card,
.settings-card,
.admin-container,
.modal-card,
.custom-dialog-card,
.sign-system-card,
.welfare-card {
    background: var(--glass-bg) !important;
    backdrop-filter: var(--glass-blur) !important;
    -webkit-backdrop-filter: var(--glass-blur) !important;
    border-radius: 24px !important;
    border: 1px solid var(--glass-border) !important;
    box-shadow: var(--glass-shadow) !important;
    padding: 24px 20px;
    margin-bottom: 14px;
    transform: translateZ(0);
    will-change: backdrop-filter;
}

/* ===== 按钮 ===== */
.btn,
.sign-btn-primary,
.settings-btn {
    border: none !important;
    outline: none !important;
    background: rgba(255, 255, 255, 0.2) !important;
    backdrop-filter: blur(15px) saturate(180%) !important;
    -webkit-backdrop-filter: blur(15px) saturate(180%) !important;
    border: 1px solid rgba(255, 255, 255, 0.5) !important;
    color: var(--text-primary) !important;
    padding: 12px 24px;
    border-radius: 14px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: opacity 0.2s, transform 0.2s;
    width: 100%;
    margin-top: 10px;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04), inset 0 1px 0 rgba(255, 255, 255, 0.9);
    transform: translateZ(0);
}

.btn:active,
.sign-btn-primary:active,
.settings-btn:active {
    transform: scale(0.98) translateZ(0);
    background: rgba(255, 255, 255, 0.5) !important;
}

.sign-captcha-btn {
    background: rgba(255, 255, 255, 0.2) !important;
    backdrop-filter: blur(15px) saturate(180%);
    -webkit-backdrop-filter: blur(15px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.5) !important;
    border-radius: 14px;
    padding: 10px 16px;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: 0.2s;
    white-space: nowrap;
    border-bottom: none !important;
    outline: none !important;
}

.sign-captcha-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* 输入框 */
.sign-input-field,
.settings-input,
.settings-name-input,
.custom-dialog-input {
    background: rgba(255, 255, 255, 0.25) !important;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 14px;
    padding: 10px 14px;
    font-size: 0.95rem;
    outline: none;
    color: var(--text-primary);
    transform: translateZ(0);
}

.sign-input-field:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(30, 111, 255, 0.2);
    background: rgba(255, 255, 255, 0.4);
}

/* 登录/注册专用样式（并排布局 + 头像圆圈） */
.sign-tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    background: rgba(255, 255, 255, 0.2);
    padding: 6px;
    border-radius: 40px;
    backdrop-filter: blur(10px);
}

.sign-tab {
    flex: 1;
    text-align: center;
    padding: 12px 0;
    border-radius: 32px;
    font-weight: 550;
    font-size: 1rem;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all 0.25s ease;
}

.sign-tab.active {
    background: var(--accent);
    color: white;
    font-weight: 600;
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
}

.sign-input-group {
    margin-bottom: 14px;
}

.sign-input-group label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-left: 10px;
    display: block;
    margin-bottom: 4px;
}

.sign-row-with-button {
    display: flex;
    gap: 8px;
    align-items: center;
}

.sign-row-with-button .sign-input-field {
    flex: 1;
}

.sign-row-with-button img {
    height: 40px;
    width: auto;
    min-width: 100px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    cursor: pointer;
    background: #f0f0f0;
    transition: 0.2s;
}

.sign-row-with-button img:active {
    transform: scale(0.97);
}

.sign-avatar-upload {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 16px;
}

.sign-avatar-circle {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.45);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.2rem;
    font-weight: 400;
    color: var(--text-secondary);
    border: 2px solid rgba(255, 255, 255, 0.8);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.05);
    transition: 0.2s;
    cursor: pointer;
    overflow: hidden;
}

.sign-avatar-circle:active {
    transform: scale(0.96);
}

.sign-avatar-circle img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.sign-avatar-placeholder {
    font-size: 2rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== 弹窗按钮强制修复 ===== */
.custom-dialog-overlay {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    background: rgba(0, 0, 0, 0.4) !important;
    backdrop-filter: blur(8px) !important;
    z-index: 10000 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
}

.custom-dialog-card {
    background: rgba(30, 30, 40, 0.85) !important;
    backdrop-filter: blur(28px) !important;
    border-radius: 28px !important;
    padding: 24px 20px !important;
    width: 280px !important;
    text-align: center !important;
    border: 1px solid rgba(255, 255, 255, 0.2) !important;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3) !important;
}

.custom-dialog-message {
    color: white !important;
    font-size: 1rem !important;
    margin-bottom: 24px !important;
    line-height: 1.4 !important;
}

.custom-dialog-buttons {
    display: flex !important;
    justify-content: center !important;
}

.custom-dialog-btn {
    background: #1e6fff !important;
    border: none !important;
    color: white !important;
    padding: 10px 28px !important;
    border-radius: 40px !important;
    font-weight: 600 !important;
    font-size: 1rem !important;
    cursor: pointer !important;
    min-width: 100px !important;
    transition: 0.2s !important;
}

.custom-dialog-btn.primary {
    background: #1e6fff !important;
}

.custom-dialog-btn:active {
    transform: scale(0.96);
}

/* ===== 其他通用组件 ===== */
.custom-dialog-overlay,
#productModal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.25) !important;
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
}

.custom-dialog-overlay.show,
#productModal.show {
    opacity: 1;
    visibility: visible;
}

.custom-dialog-card,
#productModal > div {
    background: var(--glass-bg) !important;
    backdrop-filter: blur(28px) saturate(180%);
    -webkit-backdrop-filter: blur(28px) saturate(180%);
    border-radius: 24px;
    padding: 28px 24px;
    max-width: 360px;
    width: 85%;
    text-align: center;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    transform: translateZ(0);
}

/* 设置页 */
.settings-section {
    margin-bottom: 24px;
}

.settings-section-title {
    font-size: 1.05rem;
    font-weight: 650;
    color: var(--text-primary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.settings-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 4px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.4);
}

.settings-item.clickable {
    cursor: pointer;
}

.settings-item-label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
    color: var(--text-primary);
}

.lang-switch-row {
    display: flex;
    gap: 8px;
}

.lang-btn {
    padding: 5px 14px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(12px);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.lang-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.back-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
}

.settings-avatar-upload {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 10px 0;
}

.settings-avatar-circle {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.35);
    overflow: hidden;
    border: 2px dashed rgba(255, 255, 255, 0.8);
    cursor: pointer;
}

.settings-avatar-circle img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.settings-input,
.settings-name-input {
    width: 100%;
    margin: 6px 0;
}

/* 首页头像 */
.avatar-img {
    width: 96px;
    height: 96px;
    border-radius: 96px;
    object-fit: cover;
    border: 3px solid white;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.motto {
    font-size: 1rem;
    margin: 8px 0;
    color: var(--text-secondary);
    text-align: center;
}

/* 验证码图片通用 */
#captchaImg,
img[src*="captcha.php"] {
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 12px;
    cursor: pointer;
    background: #f8f8f8;
    transition: 0.1s linear;
    height: 40px;
    width: auto;
    min-width: 100px;
    object-fit: cover;
}

/* ===== 手风琴 ===== */
.accordion-item {
    background: var(--glass-bg);
    backdrop-filter: blur(15px) saturate(160%);
    -webkit-backdrop-filter: blur(15px) saturate(160%);
    border-radius: 16px;
    margin-bottom: 10px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    border: 1px solid var(--glass-border);
    transform: translateZ(0);
    will-change: transform;
}

.accordion-header {
    padding: 14px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
    background: transparent;
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.45s cubic-bezier(0.16, 1, 0.3, 1);
    padding: 0 16px;
    transform: translateZ(0);
    backface-visibility: hidden;
}

.accordion-item.active .accordion-content {
    max-height: 2000px;
    padding-bottom: 16px;
}

.accordion-icon i {
    transition: transform 0.35s ease;
}
.accordion-item.active .accordion-icon i {
    transform: rotate(180deg);
}

.content-inner {
    color: var(--text-secondary);
}

/* 签到页 */
.sign-system-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: 24px;
    padding: 22px 20px 28px;
    box-shadow: var(--glass-shadow);
    border: 1px solid var(--glass-border);
}

.sign-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 16px;
}

.sign-avatar-sm {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid rgba(255, 255, 255, 0.8);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.sign-stats-row {
    display: flex;
    justify-content: space-around;
    margin: 12px 0;
    text-align: center;
    color: var(--text-primary);
}

.sign-log-list {
    list-style: none;
    max-height: 180px;
    overflow-y: auto;
    font-size: 0.8rem;
}

.sign-log-item {
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 10px;
    margin-bottom: 6px;
}

/* 管理后台 */
.admin-container {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: 24px;
    padding: 20px;
    box-shadow: var(--glass-shadow);
    border: 1px solid var(--glass-border);
    margin-bottom: 14px;
}

.admin-tab {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

.admin-tab button {
    flex: 1;
    padding: 10px;
    border-radius: 14px;
    border: none;
    background: rgba(255, 255, 255, 0.4);
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
}

.admin-tab button.active {
    background: var(--accent);
    color: #fff;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.admin-table th,
.admin-table td {
    padding: 10px 6px;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

.admin-table th {
    background: rgba(255, 255, 255, 0.5);
    font-weight: 600;
    color: var(--text-primary);
}

.admin-table td button {
    margin: 2px;
    padding: 6px 12px;
    border-radius: 10px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    color: var(--text-primary);
    border: none;
    transition: 0.2s;
}

.admin-table td button.danger {
    background: var(--danger);
    color: #fff;
}

.admin-table td button.success {
    background: var(--success);
    color: #fff;
}

/* ===== 捐赠页面 ===== */
.expense-box {
    background: rgba(255,255,255,0.6);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 20px;
    font-size: 14px;
    line-height: 1.6;
}
.expense-box strong {
    display: block;
    margin-bottom: 8px;
}
.donate-desc {
    text-align: center;
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 20px;
}
.qrcode {
    max-width: 200px;
    margin: 16px auto;
    display: block;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    background: rgba(255,255,255,0.6);
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
.donate-table {
    min-width: 800px;
    width: 100%;
    border-collapse: collapse;
}
.donate-table th,
.donate-table td {
    padding: 10px 8px;
    text-align: center;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    white-space: nowrap;
    font-size: 14px;
}
.donate-table th {
    background: rgba(30,111,255,0.15);
    font-weight: 500;
}
.donate-table tr:nth-child(even) {
    background: rgba(255,255,255,0.4);
}
.donate-table tr:nth-child(odd) {
    background: rgba(255,255,255,0.2);
}

/* ===== 聊天室 (Loli.Chat 风格) ===== */
.chat-container {
    display: flex;
    gap: 8px;
    height: calc(100vh - 130px);
    overflow: hidden;
}
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.3);
    overflow: hidden;
}
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
}
/* 消息条目 */
.chat-msg {
    display: flex;
    gap: 10px;
    margin-bottom: 18px;
    animation: fadeIn 0.2s ease;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
/* 头像 */
.msg-avatar {
    flex-shrink: 0;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    overflow: hidden;
    cursor: pointer;
    background: rgba(255,255,255,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
}
.msg-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
/* 消息主体 */
.msg-body {
    flex: 1;
    min-width: 0;
}
.msg-header {
    display: flex;
    align-items: baseline;
    gap: 6px;
    margin-bottom: 4px;
}
.msg-username {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}
.msg-time {
    font-size: 0.7rem;
    color: var(--text-secondary);
}
.msg-content {
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--text-primary);
    word-break: break-word;
    background: rgba(255,255,255,0.5);
    padding: 8px 12px;
    border-radius: 14px;
    display: inline-block;
    max-width: 100%;
    position: relative;
}
/* 引用 */
.quoted-msg {
    border-left: 3px solid var(--accent);
    padding: 4px 8px;
    margin-bottom: 6px;
    background: rgba(30,111,255,0.08);
    border-radius: 0 8px 8px 0;
    font-size: 0.85rem;
    color: #666;
}
/* 三个点按钮 */
.msg-more-btn {
    position: absolute;
    top: 2px;
    right: 2px;
    font-size: 1rem;
    line-height: 1;
    color: #999;
    cursor: pointer;
    user-select: none;
    padding: 2px 4px;
    border-radius: 4px;
    background: rgba(255,255,255,0.5);
    display: none;
}
.chat-msg:hover .msg-more-btn {
    display: block;
}
.msg-content:hover .msg-more-btn {
    display: block;
}
/* 菜单弹出 */
.msg-popup-menu {
    position: absolute;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    z-index: 999;
    padding: 4px 0;
    min-width: 80px;
    font-size: 0.9rem;
}
.popup-item {
    padding: 8px 16px;
    cursor: pointer;
    color: #333;
}
.popup-item:hover {
    background: #f0f0f0;
}

/* 输入区域 */
.chat-input-area {
    display: flex;
    gap: 8px;
    padding: 12px;
    border-top: 1px solid rgba(255,255,255,0.3);
    background: rgba(255,255,255,0.15);
}
.chat-input-area input {
    flex: 1;
    background: rgba(255,255,255,0.5);
    border: 1px solid rgba(255,255,255,0.5);
    border-radius: 20px;
    padding: 10px 16px;
    font-size: 0.95rem;
    color: var(--text-primary);
    outline: none;
    transition: 0.2s;
}
.chat-input-area input:focus {
    border-color: var(--accent);
    background: rgba(255,255,255,0.7);
}
.chat-input-area button {
    width: auto;
    margin: 0;
    background: var(--accent) !important;
    color: #fff !important;
    border-radius: 20px !important;
    padding: 10px 20px !important;
    font-size: 0.9rem;
    flex-shrink: 0;
}
.chat-input-area button:active {
    transform: scale(0.95);
}

/* 右侧极简栏 */
.chat-sidebar {
    width: 40px;
    background: rgba(255,255,255,0.25);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 18px;
    border: 1px solid rgba(255,255,255,0.4);
    padding: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    overflow-y: auto;
}

/* ===== 签到翻转卡片 ===== */
.flip-card {
    background-color: transparent;
    width: 100%;
    height: 460px;
    perspective: 1000px;
    margin: 20px 0;
}
.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    border-radius: 32px;
}
.flip-card-inner.flipped {
    transform: rotateY(180deg);
}
.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 32px;
    overflow: hidden;
}
.flip-card-front {
    background: linear-gradient(135deg, rgba(64, 180, 220, 0.5), rgba(70, 130, 250, 0.5));
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.25);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px;
}
.flip-card-back {
    transform: rotateY(180deg);
    background: #000;
}
.daily-image-full {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    top: 0;
    left: 0;
}
.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}
.image-date-box {
    position: absolute;
    top: 12px;
    right: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    color: #fff;
    border-radius: 12px;
    padding: 6px 10px;
    line-height: 1.2;
}
.image-date-day {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 1px;
}
.image-date-ym {
    font-size: 11px;
    opacity: 0.9;
}
.back-footer-overlay {
    position: absolute;
    bottom: 16px;
    left: 0;
    width: 100%;
    text-align: center;
    color: rgba(255,255,255,0.85);
    font-size: 13px;
    text-shadow: 0 1px 4px rgba(0,0,0,0.6);
}
.stats-area {
    display: flex;
    justify-content: space-around;
    width: 100%;
    margin-bottom: 40px;
}
.stat-item {
    text-align: center;
}
.stat-label {
    font-size: 14px;
    color: rgba(255,255,255,0.8);
    margin-bottom: 8px;
}
.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: #fff;
}
.sign-btn-large {
    background: linear-gradient(135deg, #4facfe, #00f2fe);
    border: none;
    border-radius: 60px;
    padding: 14px 28px;
    color: white;
    font-weight: 600;
    font-size: 18px;
    cursor: pointer;
    transition: 0.2s;
    width: 80%;
    margin-bottom: 20px;
    box-shadow: 0 4px 12px rgba(0, 200, 255, 0.3);
}
.sign-btn-large:active {
    transform: scale(0.96);
}
.total-sign-text {
    font-size: 13px;
    color: rgba(255,255,255,0.7);
}