:root {
    --bg:       #0d0d1a;
    --surface:  #1a1a2e;
    --surface2: #22223b;
    --primary:  #6c63ff;
    --primary-d:#4b44cc;
    --accent:   #ff6584;
    --text:     #f0f0ff;
    --muted:    #8888aa;
    --border:   #2a2a45;
    --success:  #4caf50;
    --error:    #f44336;
    --radius:   10px;
    --sidebar-w:240px;
}

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

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    font-size: 15px;
    line-height: 1.5;
}

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

/* ── Layout ── */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-w);
    background: var(--surface);
    border-right: 1px solid var(--border);
    padding: 24px 0;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 10;
}

.sidebar-logo {
    padding: 0 20px 24px;
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    border-bottom: 1px solid var(--border);
    margin-bottom: 8px;
}
.sidebar-logo span { color: var(--text); }

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: var(--muted);
    cursor: pointer;
    border-left: 3px solid transparent;
    transition: all .15s;
    text-decoration: none;
    font-size: 14px;
}
.nav-item:hover, .nav-item.active {
    color: var(--text);
    background: var(--surface2);
    border-left-color: var(--primary);
    text-decoration: none;
}
.nav-item .icon { font-size: 18px; width: 22px; text-align: center; }
.nav-badge {
    margin-left: auto;
    background: var(--accent);
    color: #fff;
    font-size: 11px;
    border-radius: 10px;
    padding: 1px 7px;
    font-weight: 700;
}

.sidebar-bottom { margin-top: auto; border-top: 1px solid var(--border); padding-top: 8px; }

.main {
    margin-left: var(--sidebar-w);
    flex: 1;
    padding: 32px 36px;
    max-width: 1100px;
}

/* ── Auth pages ── */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}
.auth-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px;
    width: 100%;
    max-width: 420px;
}
.auth-card h1 { font-size: 26px; margin-bottom: 4px; }
.auth-card .subtitle { color: var(--muted); margin-bottom: 28px; font-size: 14px; }

/* ── Forms ── */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 13px; color: var(--muted); font-weight: 600; }
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 7px;
    color: var(--text);
    font-size: 15px;
    outline: none;
    transition: border-color .15s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: var(--primary); }
.form-group textarea { resize: vertical; min-height: 80px; }

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    border: none;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all .15s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-d); }
.btn-secondary { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--border); }
.btn-danger { background: var(--error); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-full { width: 100%; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ── Cards ── */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
}
.card-title { font-size: 18px; font-weight: 700; margin-bottom: 16px; }

/* ── Grid ── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

/* ── Page header ── */
.page-header { margin-bottom: 24px; }
.page-header h1 { font-size: 24px; font-weight: 700; }
.page-header p { color: var(--muted); margin-top: 4px; font-size: 14px; }

/* ── Stat cards ── */
.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.stat-label { font-size: 12px; color: var(--muted); text-transform: uppercase; font-weight: 600; }
.stat-value { font-size: 28px; font-weight: 700; color: var(--primary); }
.stat-sub { font-size: 12px; color: var(--muted); }

/* ── Shop model card ── */
.model-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: border-color .15s, transform .15s;
}
.model-card:hover { border-color: var(--primary); transform: translateY(-2px); }
.model-thumb {
    width: 100%;
    aspect-ratio: 1;
    background: var(--surface2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    overflow: hidden;
}
.model-thumb img { width: 100%; height: 100%; object-fit: cover; }
.model-body { padding: 12px; flex: 1; display: flex; flex-direction: column; gap: 4px; }
.model-title { font-size: 14px; font-weight: 600; }
.model-creator { font-size: 12px; color: var(--muted); }
.model-footer { padding: 10px 12px; border-top: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.model-price { font-weight: 700; color: var(--primary); font-size: 14px; }
.badge-owned { font-size: 11px; color: var(--success); font-weight: 600; }
.category-badge {
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 10px;
    background: var(--surface2);
    color: var(--muted);
    text-transform: capitalize;
}

/* ── Filter bar ── */
.filter-bar { display: flex; gap: 10px; margin-bottom: 20px; flex-wrap: wrap; align-items: center; }
.filter-btn {
    padding: 7px 16px;
    border-radius: 20px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--muted);
    font-size: 13px;
    cursor: pointer;
    transition: all .15s;
}
.filter-btn.active, .filter-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.search-input {
    padding: 8px 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text);
    font-size: 13px;
    outline: none;
    width: 200px;
}
.search-input:focus { border-color: var(--primary); }

/* ── Messages ── */
.messages-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 20px;
    height: calc(100vh - 120px);
}
.convo-list { overflow-y: auto; display: flex; flex-direction: column; gap: 2px; }
.convo-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: 8px;
    cursor: pointer;
    transition: background .1s;
    border: 1px solid transparent;
}
.convo-item:hover { background: var(--surface2); }
.convo-item.active { background: var(--surface2); border-color: var(--primary); }
.avatar-circle {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 700;
    flex-shrink: 0;
    color: #fff;
}
.convo-info { flex: 1; min-width: 0; }
.convo-name { font-size: 14px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.convo-last { font-size: 12px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.convo-time { font-size: 11px; color: var(--muted); flex-shrink: 0; }

.chat-panel {
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}
.chat-header {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.msg-bubble {
    max-width: 70%;
    padding: 10px 14px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.4;
}
.msg-bubble.mine {
    background: var(--primary);
    color: #fff;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}
.msg-bubble.theirs {
    background: var(--surface2);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}
.msg-time { font-size: 10px; color: var(--muted); margin-top: 2px; text-align: right; }
.chat-input-row {
    padding: 14px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 10px;
}
.chat-input {
    flex: 1;
    padding: 10px 14px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 14px;
    outline: none;
    resize: none;
}
.chat-input:focus { border-color: var(--primary); }
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--muted);
    gap: 12px;
    font-size: 14px;
}
.empty-state .icon { font-size: 48px; }

/* ── Friends ── */
.friend-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 8px;
}
.friend-info { flex: 1; }
.friend-name { font-weight: 600; font-size: 14px; }
.friend-username { font-size: 12px; color: var(--muted); }
.friend-actions { display: flex; gap: 8px; }

/* ── Wallet ── */
.topup-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 20px 0; }
.topup-option {
    background: var(--surface2);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
    cursor: pointer;
    transition: all .15s;
}
.topup-option:hover, .topup-option.selected {
    border-color: var(--primary);
    background: rgba(108, 99, 255, .1);
}
.topup-amount { font-size: 22px; font-weight: 700; color: var(--primary); }
.topup-price { font-size: 12px; color: var(--muted); margin-top: 4px; }
.txn-row {
    display: flex;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
    gap: 12px;
    font-size: 14px;
}
.txn-row:last-child { border-bottom: none; }
.txn-type { flex: 1; color: var(--muted); }
.txn-amount { font-weight: 700; }
.txn-amount.plus { color: var(--success); }
.txn-amount.minus { color: var(--error); }
.txn-date { font-size: 12px; color: var(--muted); }

/* ── Tabs ── */
.tabs { display: flex; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.tab-btn { padding: 10px 18px; background: none; border: none; color: var(--muted); cursor: pointer; font-size: 14px; border-bottom: 2px solid transparent; margin-bottom: -1px; transition: all .15s; }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── Upload ── */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 40px 20px;
    text-align: center;
    color: var(--muted);
    cursor: pointer;
    transition: all .15s;
}
.drop-zone:hover, .drop-zone.drag-over { border-color: var(--primary); background: rgba(108,99,255,.05); }
.drop-zone .icon { font-size: 40px; margin-bottom: 12px; }

/* ── Toast ── */
#toast {
    position: fixed;
    bottom: 24px; left: 50%; transform: translateX(-50%);
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    z-index: 9999;
    display: none;
    transition: opacity .3s;
}
#toast.success { background: var(--success); color: #fff; }
#toast.error { background: var(--error); color: #fff; }

/* ── Misc ── */
.text-muted { color: var(--muted); }
.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-error { color: var(--error); }
.divider { border: none; border-top: 1px solid var(--border); margin: 20px 0; }
.spinner { display: inline-block; width: 20px; height: 20px; border: 2px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin .6s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.page-loading { display: flex; align-items: center; justify-content: center; height: 200px; }

@media (max-width: 768px) {
    .sidebar { 
        display: flex;
        position: fixed; inset: 0 auto 0 0;
        transform: translateX(-100%);
        transition: transform .25s ease;
        z-index: 200;
        width: 260px;
        box-shadow: 4px 0 24px rgba(0,0,0,.5);
    }
    .sidebar.open { transform: translateX(0); }
    .sidebar-overlay {
        display: none;
        position: fixed; inset: 0;
        background: rgba(0,0,0,.5);
        z-index: 199;
    }
    .sidebar-overlay.open { display: block; }
    .main { margin-left: 0; padding: 16px; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .messages-layout { grid-template-columns: 1fr; }
    .hamburger {
        display: flex;
        position: fixed; top: 12px; left: 12px;
        z-index: 198;
        width: 40px; height: 40px;
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: 8px;
        align-items: center; justify-content: center;
        cursor: pointer; font-size: 18px;
        box-shadow: 0 2px 8px rgba(0,0,0,.3);
    }
    .main { padding-top: 60px; }
}
@media (min-width: 769px) {
    .hamburger { display: none; }
    .sidebar-overlay { display: none !important; }
}