/* =========================================
   Omoshiroi Japan Design System & Base CSS
   ========================================= */

:root {
    /* Color Palette - Light Mode (Notion/Minimal Inspired) */
    --bg-color: #ffffff;
    --surface-color: #f7f7f5;
    --surface-hover: #efeee9;
    --text-primary: #111111;
    --text-secondary: #555555;
    --border-color: #e5e5e5;
    --accent-color: #ff4d6d; /* Pink aesthetic */
    --accent-hover: #e83e5e;
    
    /* Functional Colors */
    --success-color: #0b8a5b;
    --error-color: #d13a48;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, "Apple Color Emoji", Arial, sans-serif;
    --font-jp: 'Noto Sans JP', sans-serif;
    
    /* Sizing & Spacing */
    --nav-height: 72px;
    --max-width: 1024px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    
    /* Border Radius (Duolingo Style) */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-round: 999px;
}

/* Dark Mode Variables */
body.dark-mode {
    --bg-color: #191919;
    --surface-color: #242424;
    --surface-hover: #2f2f2f;
    --text-primary: #f5f5f5;
    --text-secondary: #a0a0a0;
    --border-color: #333333;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

button {
    cursor: pointer;
    font-family: inherit;
}

/* Typography Utils */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

.jp-text {
    font-family: var(--font-jp);
}

/* =========================================
   Layout & Components
   ========================================= */

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: var(--nav-height);
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.2rem;
    font-weight: 500;
}

.brand-icon {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
}

.dashboard-link {
    background: var(--surface-color);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.theme-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
}

.theme-btn:hover {
    color: var(--text-primary);
    background: var(--surface-hover);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    flex-direction: column;
    gap: 4px;
    padding: 4px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: 0.3s;
}

/* Main Content Area */
.page-content {
    margin-top: var(--nav-height);
    min-height: calc(100vh - var(--nav-height) - 100px);
    padding-bottom: var(--spacing-3xl);
    opacity: 1;
    transition: opacity 0.3s ease;
}

.page-content.fade-out {
    opacity: 0;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) var(--spacing-lg);
    background: var(--surface-color);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xl);
}

.footer-col h3, .footer-col h4 {
    margin-bottom: var(--spacing-md);
}

.footer-col a {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.footer-col p {
    color: var(--text-secondary);
}

.footer-bottom {
    max-width: var(--max-width);
    margin: var(--spacing-xl) auto 0;
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* =========================================
   Buttons & Utilities (Duolingo feel)
   ========================================= */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius-lg);
    font-weight: 700;
    font-size: 1rem;
    transition: all 0.1s ease;
    border: none;
    cursor: pointer;
    text-align: center;
    user-select: none;
}

.btn:active {
    transform: translateY(2px) !important;
    box-shadow: none !important;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
    border-bottom: 4px solid #d13a48; /* Duolingo 3D effect */
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-primary:disabled {
    background-color: var(--border-color);
    border-bottom: 4px solid #cccccc;
    color: var(--text-secondary);
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background-color: var(--bg-color);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-bottom: 4px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--surface-hover);
}

.card {
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    box-shadow: 0 4px 0 rgba(0,0,0,0.02);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 rgba(0,0,0,0.04);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade {
    animation: fadeIn 0.5s ease forwards;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        gap: 0;
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--bg-color);
        border-bottom: 2px solid var(--border-color);
        padding: var(--spacing-md) var(--spacing-lg);
        z-index: 999;
        box-shadow: 0 8px 24px rgba(0,0,0,.08);
    }
    .nav-links.mobile-open {
        display: flex;
    }
    .nav-links li { width: 100%; }
    .nav-links a  { padding: 12px 0; display: block; font-size: 1rem; color: var(--text-primary); }
    .nav-search-container { display: none; } /* hide search on mobile for now */
    .nav-dropdown-menu    { position: static !important; box-shadow: none !important; border: none !important;
                            padding: 0 0 0 16px !important; margin-top: 0 !important; }
    .mobile-menu-btn { display: flex; }
    .footer-container { grid-template-columns: 1fr; }
}

/* Dropdown Nav */
.nav-dropdown { position: relative; }
.nav-dropdown-trigger { display: flex; align-items: center; gap: 4px; cursor: pointer; }
.nav-chevron  { font-size: .65rem; transition: transform .2s; }
.nav-dropdown:hover .nav-chevron { transform: rotate(180deg); }

.nav-dropdown-menu {
    position: absolute;
    top: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%);
    min-width: 200px;
    padding: var(--spacing-sm) 0 !important;
    display: none;
    z-index: 1100;
    border-radius: var(--radius-lg) !important;
    box-shadow: 0 12px 32px rgba(0,0,0,.12) !important;
    animation: fadeDown .15s ease;
}
@keyframes fadeDown { from{opacity:0;transform:translateX(-50%) translateY(-6px)} to{opacity:1;transform:translateX(-50%) translateY(0)} }

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu { display: block; }

.nav-dropdown-item {
    display: flex !important;
    align-items: center;
    gap: 10px;
    padding: 10px 18px !important;
    color: var(--text-primary) !important;
    font-weight: 500;
    transition: background .15s;
    white-space: nowrap;
}
.nav-dropdown-item:hover { background: var(--surface-hover) !important; }

.dd-badge {
    font-size: .7rem;
    font-weight: 800;
    padding: 2px 8px;
    border-radius: 99px;
    display: inline-block;
    min-width: 32px;
    text-align: center;
}

/* Animate fade-in for page transitions */
.animate-fade-in {
    animation: fadeIn .35s ease forwards;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0);    }
}

/* Skeleton reuse */
.list-skeleton {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}
.skeleton-card {
    height: 110px; border-radius: var(--radius-lg);
    background: linear-gradient(90deg, var(--surface-hover) 25%, var(--border-color) 37%, var(--surface-hover) 63%);
    background-size: 400% 100%;
    animation: skeleton-slide 1.4s ease infinite;
}
@keyframes skeleton-slide {
    0%   { background-position: 100% 50%; }
    100% { background-position:   0% 50%; }
}

/* Pagination reuse */
.pagination { display:flex; justify-content:center; align-items:center; gap:6px; flex-wrap:wrap; margin-top:var(--spacing-xl); }
.page-btn {
    min-width:38px; height:38px; border-radius:var(--radius-md);
    border:2px solid var(--border-color); background:transparent;
    color:var(--text-primary); font-size:.9rem; font-weight:600; cursor:pointer;
    transition:all .15s; display:flex; align-items:center; justify-content:center;
}
.page-btn:hover, .page-btn.active { border-color:var(--accent-color); background:var(--accent-color); color:#fff; }
.page-btn:disabled { opacity:.4; cursor:default; }
.page-ellipsis { color:var(--text-secondary); padding:0 4px; }

/* Filter pills reuse */
.filter-pill {
    padding:6px 14px; border-radius:99px; border:2px solid var(--border-color);
    background:transparent; color:var(--text-secondary); font-size:.8rem; font-weight:600;
    cursor:pointer; transition:all .15s;
}
.filter-pill:hover  { border-color:var(--accent-color); color:var(--accent-color); }
.filter-pill.active { border-color:var(--accent-color); background:var(--accent-color); color:#fff; }