html {
    scrollbar-gutter: stable;
}

:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --background-color: #f8fafc;
    --surface-color: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --error-color: #ef4444;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Shadow */
    --shadow-sm: 0 1px 3px rgb(0 0 0 / 0.06), 0 1px 2px rgb(0 0 0 / 0.04);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.08), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --shadow-lg: 0 10px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.04);
}

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

body {
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* =============================================
   Header & Navigation — Dark Premium Theme
   ============================================= */
.app-header {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    position: sticky;
    top: 0;
    z-index: 50;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    transition: box-shadow 0.3s ease;
}

.app-header.scrolled {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
}

.header-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* ---- Hamburger (mobile) ---- */
.hamburger-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 100;
}

.hamburger-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 2px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.hamburger-btn.is-active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.hamburger-btn.is-active span:nth-child(2) {
    opacity: 0;
}

.hamburger-btn.is-active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

/* ---- Logo ---- */
.logo {
    font-size: 1.15rem;
    font-weight: 700;
    text-decoration: none;
    letter-spacing: -0.025em;
    white-space: nowrap;
    margin-right: var(--spacing-sm);
    background: linear-gradient(135deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: opacity 0.2s;
}

.logo:hover {
    opacity: 0.85;
}

/* ---- Global Navigation ---- */
.global-nav ul {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 2px;
    margin: 0;
    padding: 0;
}

.global-nav a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    color: rgba(255, 255, 255, 0.6);
    font-weight: 500;
    font-size: 0.85rem;
    padding: 0.4rem 0.75rem;
    border-radius: 999px;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    position: relative;
}

.global-nav a .nav-icon {
    font-size: 0.8rem;
    opacity: 0.7;
    transition: opacity 0.25s;
}

.global-nav a:hover {
    color: rgba(255, 255, 255, 0.95);
    background: rgba(255, 255, 255, 0.08);
}

.global-nav a:hover .nav-icon {
    opacity: 1;
}

.global-nav a.active {
    color: #fff;
    background: linear-gradient(135deg, #3b82f6, #6366f1);
    box-shadow: 0 0 16px rgba(99, 102, 241, 0.4);
}

.global-nav a.active .nav-icon {
    opacity: 1;
}

/* ---- Nav Dropdown (管理メニュー) ---- */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    color: rgba(251, 191, 36, 0.85) !important;
    cursor: pointer;
}

.nav-dropdown-toggle:hover {
    color: #fbbf24 !important;
    background: rgba(251, 191, 36, 0.1) !important;
}

.global-nav .nav-dropdown-menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 210px;
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.05);
    padding: 6px;
    padding-top: 14px;
    list-style: none;
    margin: 0;
    z-index: 100;
    gap: 2px;
    align-items: stretch;
}

/* トリガーとメニュー間の透明ブリッジ（ホバー途切れ防止） */
.global-nav .nav-dropdown-menu::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 0;
    right: 0;
    height: 8px;
}

.global-nav .nav-dropdown:hover .nav-dropdown-menu {
    display: flex;
}

.nav-dropdown-menu li a {
    display: flex;
    align-items: center;
    padding: 0.55rem 0.85rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.75) !important;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    white-space: nowrap;
}

.nav-dropdown-menu li a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff !important;
}

.nav-dropdown-menu li a i {
    color: rgba(251, 191, 36, 0.7);
    transition: color 0.2s;
}

.nav-dropdown-menu li a:hover i {
    color: #fbbf24;
}

/* ---- User Profile Area ---- */
.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.user-name {
    font-weight: 600;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.85);
    white-space: nowrap;
}

.user-name .badge {
    font-size: 0.65rem;
    padding: 0.15rem 0.45rem;
    vertical-align: middle;
    background: linear-gradient(135deg, #ef4444, #f97316) !important;
    border: none;
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.3);
}

.logout-btn {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.12);
    padding: 0.25rem 0.7rem;
    border-radius: 999px;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
}

.logout-btn:hover {
    color: #fca5a5;
    border-color: rgba(239, 68, 68, 0.4);
    background: rgba(239, 68, 68, 0.1);
    box-shadow: 0 0 12px rgba(239, 68, 68, 0.15);
}

/* Main Content */
.app-main {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

/* Page Container */
.page-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1rem;
}

.page-container-wide {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Admin Upload Card */
.card.admin-upload-card {
    border-radius: var(--radius-lg);
    border: 2px solid #fecaca;
    background: #fff5f5;
    transition: all 0.2s ease;
}

.card.admin-upload-card.is-dragover {
    background: #ffe4e6;
    border-color: #dc3545;
    transform: scale(1.01);
}

.card.admin-upload-card .admin-upload-label {
    font-weight: bold;
    font-size: 0.9rem;
}

/* Common Components */
.page-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card {
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-color);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

/* card-static以外はホバーで影を強調 */
.card:not(.card-static):hover {
    box-shadow: var(--shadow-md);
}

/* テーブルのリファイン */
.table {
    border-collapse: separate;
    border-spacing: 0;
}

.table.table-bordered {
    border-collapse: collapse;
}

.table thead th {
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
    border-bottom: 2px solid var(--border-color);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--text-secondary);
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
}

.table tbody tr {
    transition: background-color 0.15s ease;
}

.table tbody tr:hover {
    background-color: var(--background-color);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
    transition-duration: 0.1s;
}

/* フォーカスリング（キーボード操作時のみ表示） */
.btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-outline-primary:hover,
.btn-outline-secondary:hover,
.btn-outline-danger:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-success:hover {
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

.btn-danger:hover {
    box-shadow: 0 4px 14px rgba(239, 68, 68, 0.3);
}

.btn-warning:hover {
    box-shadow: 0 4px 14px rgba(245, 158, 11, 0.3);
}

.btn-block {
    width: 100%;
}

/* Form Styles */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-actions {
    margin-top: var(--spacing-lg);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

/* Login Page Specific */
.login-container {
    max-width: 400px;
    margin: 4rem auto;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: var(--shadow-lg);
}

/* Footer */
.app-footer {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: 0.875rem;
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
}

/* =============================================
   Tab Navigation
   ============================================= */
.app-tabs-wrapper {
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.app-tabs {
    display: flex;
    gap: 0;
    padding: 0;
    background: transparent;
    border: none;
    border-bottom: 2px solid var(--border-color);
    border-radius: 0;
    box-shadow: none;
    position: relative;
}

.app-tab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 20px;
    border-radius: 0;
    font-size: 0.875rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--text-secondary);
    background: transparent;
    white-space: nowrap;
    transition: color 0.2s ease;
    user-select: none;
    position: relative;
}

/* アクティブタブの下線バーを疑似要素で描画 */
.app-tab-active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.app-tab:hover {
    color: var(--primary-color);
    background: transparent;
}

.app-tab:active {
    transform: none;
}

.app-tab-active {
    color: var(--primary-color) !important;
    background: transparent;
    box-shadow: none;
}

.app-tab-active:hover {
    transform: none;
    opacity: 1;
}

.app-tab-icon {
    font-size: 0.8rem;
    opacity: 0.85;
}

.app-tab-active .app-tab-icon {
    opacity: 1;
}

/* =============================================
   Pagination
   ============================================= */
.pagination-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
}

.pagination-info {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.pagination-info strong {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1rem;
}

.pagination-page-info {
    margin-left: 0.25rem;
    opacity: 0.7;
}

.pagination-nav {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.pagination-pages {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.pagination-btn,
.pagination-page {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 38px;
    height: 38px;
    padding: 0 var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    user-select: none;
}

.pagination-btn:hover,
.pagination-page:hover {
    background: #eff6ff;
    color: var(--primary-color);
    transform: translateY(-1px);
}

.pagination-btn:active,
.pagination-page:active {
    transform: translateY(0);
}

/* 現在ページ */
.pagination-current {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: #fff !important;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
    pointer-events: none;
}

.pagination-current:hover {
    transform: none;
}

/* 無効状態（前へ／次へ等） */
.pagination-disabled {
    color: var(--border-color);
    pointer-events: none;
    opacity: 0.4;
}

/* 省略記号 */
.pagination-ellipsis {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 38px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    opacity: 0.5;
    letter-spacing: 2px;
    user-select: none;
}

/* 前後ボタンのアイコン */
.pagination-btn i {
    font-size: 0.75rem;
}

.pagination-edge i {
    font-size: 0.7rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .hamburger-btn {
        display: flex;
    }

    .header-menu {
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        background: rgba(15, 23, 42, 0.97);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        padding: var(--spacing-md);
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
        flex-direction: column;
        align-items: stretch;
        border-bottom: 1px solid rgba(255, 255, 255, 0.06);

        /* Hide by default */
        display: none;
        opacity: 0;
        transform: translateY(-10px);
        transition: opacity 0.3s, transform 0.3s;
    }

    .header-menu.is-active {
        display: flex;
        opacity: 1;
        transform: translateY(0);
    }

    .global-nav ul {
        flex-direction: column;
        width: 100%;
        gap: 2px;
    }

    .global-nav li {
        width: 100%;
    }

    .global-nav a {
        display: flex;
        justify-content: center;
        padding: 0.7rem var(--spacing-md);
        width: 100%;
        border-radius: var(--radius-md);
    }

    /* モバイル: ドロップダウンを常時展開表示 */
    .global-nav .nav-dropdown-menu {
        display: flex;
        position: static;
        transform: none;
        box-shadow: none;
        border: none;
        background: transparent;
        backdrop-filter: none;
        padding: 0;
        margin: 0;
        min-width: auto;
    }

    .global-nav .nav-dropdown-toggle .fa-chevron-down {
        display: none;
    }

    .global-nav .nav-dropdown-menu li a {
        justify-content: center;
        padding: 0.7rem var(--spacing-md);
        color: rgba(251, 191, 36, 0.85) !important;
    }

    .global-nav .nav-dropdown-menu li a:hover {
        color: #fbbf24 !important;
    }

    .user-profile {
        margin-top: var(--spacing-md);
        flex-direction: column;
        width: 100%;
        border-top: 1px solid rgba(255, 255, 255, 0.08);
        padding-top: var(--spacing-md);
    }

    /* Tab Navigation responsive */
    .app-tabs {
        gap: 0;
        padding: 0;
    }

    .app-tab {
        padding: 10px 14px;
        font-size: 0.8rem;
        gap: var(--spacing-xs);
    }

    /* Pagination responsive */
    .pagination-nav {
        gap: 3px;
        padding: var(--spacing-xs);
    }

    .pagination-btn,
    .pagination-page {
        min-width: 34px;
        height: 34px;
        font-size: 0.8rem;
    }

    .pagination-edge {
        display: none;
    }

    .pagination-ellipsis {
        min-width: 24px;
    }
}