/* ============================================
   HZH System — 長輩友善 Mobile-First CSS
   ============================================ */

:root {
    --font-size-base:    18px;
    --font-size-lg:      20px;
    --font-size-xl:      24px;
    --font-size-xxl:     32px;
    --font-size-small:   16px;
    --line-height:       1.8;
    --font-family:       "Microsoft JhengHei", "PingFang TC", "Noto Sans TC", sans-serif;

    --color-primary:     #2563EB;
    --color-primary-hover:#1D4ED8;
    --color-primary-light:#EFF6FF;
    --color-success:     #16A34A;
    --color-success-light:#F0FDF4;
    --color-danger:      #DC2626;
    --color-danger-light:#FEF2F2;
    --color-warning:     #F59E0B;
    --color-warning-light:#FFFBEB;

    --color-bg:          #F8FAFC;
    --color-card:        #FFFFFF;
    --color-text:        #1E293B;
    --color-text-light:  #64748B;
    --color-border:      #E2E8F0;

    --radius:            12px;
    --radius-sm:         8px;
    --shadow:            0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg:         0 4px 12px rgba(0,0,0,0.1);
}

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

html {
    font-size: var(--font-size-base);
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--color-text);
    background: var(--color-bg);
    letter-spacing: 0.5px;
    min-height: 100vh;
    padding-bottom: 72px;
}

body.no-bottom-nav { padding-bottom: 0; }
body.admin-body { padding-bottom: 0; background: #F1F5F9; }

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; }

/* ============================================
   Typography
   ============================================ */
h1 { font-size: var(--font-size-xl); font-weight: 700; margin-bottom: 16px; }
h2 { font-size: var(--font-size-lg); font-weight: 700; margin-bottom: 12px; }
h3 { font-size: var(--font-size-base); font-weight: 600; margin-bottom: 8px; }

.text-success { color: var(--color-success) !important; }
.text-danger  { color: var(--color-danger) !important; }
.text-warning { color: var(--color-warning) !important; }
.text-muted   { color: var(--color-text-light) !important; }
.text-center  { text-align: center; }
.text-right   { text-align: right; }
.text-xxl     { font-size: var(--font-size-xxl); font-weight: 700; }
.text-xl      { font-size: var(--font-size-xl); font-weight: 700; }
.text-lg      { font-size: var(--font-size-lg); }
.text-small   { font-size: var(--font-size-small); }

/* ============================================
   Layout
   ============================================ */
.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 16px;
}

.container-wide {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px;
}

/* ============================================
   Card
   ============================================ */
.card {
    background: var(--color-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 16px;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 56px;
    min-width: 120px;
    padding: 14px 32px;
    font-size: var(--font-size-lg);
    font-weight: 600;
    font-family: var(--font-family);
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    letter-spacing: 1px;
    text-decoration: none;
    line-height: 1.4;
}

.btn:disabled, .btn.loading {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}
.btn-primary:hover { background: var(--color-primary-hover); }

.btn-success {
    background: var(--color-success);
    color: #fff;
}

.btn-danger {
    background: var(--color-danger);
    color: #fff;
}

.btn-warning {
    background: var(--color-warning);
    color: #fff;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-border);
    color: var(--color-text);
}
.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn-sm {
    min-height: 40px;
    min-width: 80px;
    padding: 8px 16px;
    font-size: var(--font-size-base);
}

.btn-block { width: 100%; }

.btn-group {
    display: flex;
    gap: 12px;
}

@media (max-width: 768px) {
    .btn { width: 100%; }
    .btn-group { flex-direction: column; }
    .btn-group .btn { width: 100%; }
}

/* ============================================
   Forms
   ============================================ */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: var(--font-size-base);
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--color-text);
}

input[type="text"],
input[type="password"],
input[type="email"],
input[type="tel"],
input[type="number"],
input[type="date"],
select,
textarea {
    width: 100%;
    min-height: 52px;
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    padding: 12px 16px;
    border: 2px solid var(--color-border);
    border-radius: 10px;
    background: #fff;
    color: var(--color-text);
    transition: border-color 0.2s;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--color-primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

input.error, select.error {
    border-color: var(--color-danger);
}

.form-error {
    color: var(--color-danger);
    font-size: var(--font-size-base);
    margin-top: 6px;
}

.form-hint {
    color: var(--color-text-light);
    font-size: var(--font-size-small);
    margin-top: 4px;
}

textarea {
    min-height: 120px;
    resize: vertical;
}

/* ============================================
   Quick Amount Buttons
   ============================================ */
.quick-amounts {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 8px;
}

.quick-amount {
    padding: 10px 20px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: #fff;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-family);
}
.quick-amount:hover, .quick-amount.active {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    color: var(--color-primary);
}

/* ============================================
   Page Header
   ============================================ */
.page-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.page-header .back-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    color: var(--color-text);
    text-decoration: none;
    font-size: 24px;
}
.page-header .back-btn:hover { background: var(--color-bg); }

.page-header h1 {
    margin: 0;
    font-size: var(--font-size-xl);
    flex: 1;
}

/* ============================================
   Wallet Balance Card
   ============================================ */
.balance-card {
    background: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
    color: #fff;
    border-radius: var(--radius);
    padding: 28px 24px;
    margin-bottom: 20px;
}

.balance-card .label {
    font-size: var(--font-size-base);
    opacity: 0.9;
    margin-bottom: 8px;
}

.balance-card .amount {
    font-size: var(--font-size-xxl);
    font-weight: 700;
}

.balance-card .frozen {
    font-size: var(--font-size-small);
    opacity: 0.8;
    margin-top: 8px;
}

/* ============================================
   Action Grid (Wallet Actions)
   ============================================ */
.action-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.action-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 20px 12px;
    background: var(--color-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-decoration: none;
    color: var(--color-text);
    min-height: 90px;
    transition: transform 0.2s;
}
.action-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    text-decoration: none;
}
.action-item i { font-size: 28px; color: var(--color-primary); }
.action-item span { font-size: var(--font-size-base); font-weight: 500; }

/* ============================================
   Transaction List
   ============================================ */
.txn-list { list-style: none; }

.txn-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
}
.txn-item:last-child { border-bottom: none; }

.txn-info { flex: 1; }
.txn-info .txn-title { font-weight: 500; margin-bottom: 4px; }
.txn-info .txn-date { font-size: var(--font-size-small); color: var(--color-text-light); }

.txn-amount {
    font-size: var(--font-size-lg);
    font-weight: 700;
    white-space: nowrap;
}
.txn-amount.income { color: var(--color-success); }
.txn-amount.expense { color: var(--color-danger); }

/* ============================================
   Status Badge
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: var(--font-size-small);
    font-weight: 600;
}

.badge-success { background: var(--color-success-light); color: var(--color-success); }
.badge-danger  { background: var(--color-danger-light); color: var(--color-danger); }
.badge-warning { background: var(--color-warning-light); color: var(--color-warning); }
.badge-info    { background: var(--color-primary-light); color: var(--color-primary); }

/* ============================================
   Bottom Navigation
   ============================================ */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 64px;
    background: #fff;
    border-top: 1px solid var(--color-border);
    display: flex;
    z-index: 1000;
    box-shadow: 0 -2px 8px rgba(0,0,0,0.06);
}

.bottom-nav a {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    color: var(--color-text-light);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.2s;
    min-width: 48px;
    min-height: 48px;
}
.bottom-nav a i { font-size: 22px; }
.bottom-nav a.active { color: var(--color-primary); }

/* ============================================
   Step Indicator
   ============================================ */
.steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 24px;
    font-size: var(--font-size-small);
    color: var(--color-text-light);
}

.steps .step {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-border);
    color: #fff;
    font-weight: 600;
}

.steps .step.active {
    background: var(--color-primary);
}

.steps .step.done {
    background: var(--color-success);
}

.steps .line {
    width: 40px;
    height: 2px;
    background: var(--color-border);
}

/* ============================================
   Guide Card (for new members)
   ============================================ */
.guide-card {
    background: linear-gradient(135deg, #FFF7ED 0%, #FEF3C7 100%);
    border: 2px solid var(--color-warning);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
    text-align: center;
}
.guide-card h3 { color: #92400E; font-size: var(--font-size-lg); margin-bottom: 12px; }
.guide-card p { color: #78350F; margin-bottom: 16px; }

/* ============================================
   Table
   ============================================ */
.table-responsive { overflow-x: auto; -webkit-overflow-scrolling: touch; }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-base);
}

table th, table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    white-space: nowrap;
}

table th {
    background: var(--color-bg);
    font-weight: 600;
    position: sticky;
    top: 0;
}

table tr:hover { background: #F8FAFC; }

/* ============================================
   Pagination
   ============================================ */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 24px 0;
}

.pagination a, .pagination span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 48px;
    min-height: 48px;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
}

.pagination a {
    background: var(--color-card);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}
.pagination a:hover { border-color: var(--color-primary); color: var(--color-primary); }

.pagination span.current {
    background: var(--color-primary);
    color: #fff;
}

/* ============================================
   Toast / Alert
   ============================================ */
.alert {
    padding: 16px 20px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: var(--font-size-base);
    font-weight: 500;
}

.alert-success { background: var(--color-success-light); color: #166534; border-left: 4px solid var(--color-success); }
.alert-danger  { background: var(--color-danger-light);  color: #991B1B; border-left: 4px solid var(--color-danger); }
.alert-warning { background: var(--color-warning-light); color: #92400E; border-left: 4px solid var(--color-warning); }
.alert-info    { background: var(--color-primary-light); color: #1E40AF; border-left: 4px solid var(--color-primary); }

/* ============================================
   Board / Progress
   ============================================ */
.progress-bar {
    width: 100%;
    height: 16px;
    background: var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    margin: 12px 0;
}

.progress-bar .fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-success));
    border-radius: 8px;
    transition: width 0.6s;
}

.board-card {
    border-left: 4px solid var(--color-primary);
}
.board-card.phase2 { border-left-color: var(--color-warning); }
.board-card.settled { border-left-color: var(--color-success); }
.board-card.expired { border-left-color: var(--color-danger); }

/* ============================================
   Member List
   ============================================ */
.member-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    border-bottom: 1px solid var(--color-border);
}
.member-card:last-child { border-bottom: none; }

.member-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--color-primary);
    flex-shrink: 0;
}

.member-info { flex: 1; }
.member-info .name { font-weight: 600; margin-bottom: 4px; }
.member-info .meta { font-size: var(--font-size-small); color: var(--color-text-light); }

/* ============================================
   Admin Sidebar & Layout
   ============================================ */
@media (min-width: 1024px) {
    .admin-layout {
        display: flex;
        min-height: 100vh;
    }

    .admin-sidebar {
        width: 260px;
        background: #1E293B;
        color: #fff;
        padding: 20px 0;
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        overflow-y: auto;
    }

    .admin-sidebar .logo {
        padding: 0 20px 20px;
        font-size: var(--font-size-lg);
        font-weight: 700;
        border-bottom: 1px solid #334155;
    }

    .admin-sidebar nav a {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 14px 20px;
        color: #94A3B8;
        text-decoration: none;
        font-size: var(--font-size-base);
        transition: all 0.2s;
    }
    .admin-sidebar nav a:hover { background: #334155; color: #fff; }
    .admin-sidebar nav a.active { background: var(--color-primary); color: #fff; }
    .admin-sidebar nav a i { width: 24px; text-align: center; }

    .admin-main {
        margin-left: 260px;
        flex: 1;
        padding: 24px;
    }
}

@media (max-width: 1023px) {
    .admin-sidebar {
        display: none;
    }
    .admin-main {
        padding: 16px;
    }
    .admin-mobile-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 12px 16px;
        background: #1E293B;
        color: #fff;
    }
}

/* ============================================
   Stats Grid (Admin Dashboard)
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--color-card);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.stat-card .stat-icon {
    font-size: 28px;
    margin-bottom: 8px;
}

.stat-card .stat-value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: 4px;
}

.stat-card .stat-label {
    font-size: var(--font-size-small);
    color: var(--color-text-light);
}

/* ============================================
   Confirmation Modal
   ============================================ */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    padding: 16px;
}
.modal-overlay.show { display: flex; }

.modal-box {
    background: #fff;
    border-radius: var(--radius);
    padding: 32px 24px;
    max-width: 400px;
    width: 100%;
    text-align: center;
}

.modal-box h3 {
    font-size: var(--font-size-xl);
    margin-bottom: 16px;
}

.modal-box p {
    font-size: var(--font-size-lg);
    margin-bottom: 24px;
    color: var(--color-text);
}

/* ============================================
   Product Grid (Shop)
   ============================================ */
.product-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.product-card {
    background: var(--color-card);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    text-decoration: none;
    color: var(--color-text);
    transition: transform 0.2s;
}
.product-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.product-card img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
}

.product-card .product-info {
    padding: 12px;
}

.product-card .product-name {
    font-weight: 500;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-card .product-price {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-danger);
}

/* ============================================
   Misc
   ============================================ */
.divider {
    height: 1px;
    background: var(--color-border);
    margin: 16px 0;
}

.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.p-16 { padding: 16px; }

.hidden { display: none !important; }

/* Auth Page */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.auth-box {
    width: 100%;
    max-width: 440px;
    background: var(--color-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 40px 28px;
}

.auth-box .logo-text {
    text-align: center;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 32px;
}

/* Quantity Control */
.qty-control {
    display: flex;
    align-items: center;
    gap: 0;
}
.qty-control button {
    width: 48px;
    height: 48px;
    border: 2px solid var(--color-border);
    background: #fff;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}
.qty-control button:first-child { border-radius: 8px 0 0 8px; }
.qty-control button:last-child  { border-radius: 0 8px 8px 0; }
.qty-control input {
    width: 60px;
    min-height: 48px;
    text-align: center;
    border-left: none;
    border-right: none;
    border-radius: 0;
    font-size: var(--font-size-lg);
    font-weight: 600;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 48px 16px;
    color: var(--color-text-light);
}
.empty-state i { font-size: 48px; margin-bottom: 16px; display: block; }
.empty-state p { font-size: var(--font-size-lg); }