/* ============================================================
   Telegram AI Bot — Design System
   CSS variables, base resets, and component styles (admin + landing)
   ============================================================ */

:root {
    --bg: #0f172a;
    --bg-soft: #1e293b;
    --surface: #ffffff;
    --surface-2: #f8fafc;
    --border: #e2e8f0;
    --text: #0f172a;
    --text-muted: #64748b;
    --primary: #6366f1;
    --primary-strong: #4f46e5;
    --accent: #22d3ee;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --sidebar-bg: #0f172a;
    --sidebar-text: #cbd5e1;
    --sidebar-active: #6366f1;

    --radius: 14px;
    --radius-sm: 8px;
    --shadow: 0 10px 30px -12px rgba(15, 23, 42, .25);
    --shadow-lg: 0 25px 60px -20px rgba(15, 23, 42, .4);

    --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font);
    background: var(--bg-soft);
    color: var(--text);
    line-height: 1.6;
}

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

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .4rem;
    padding: .6rem 1.1rem;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    font-weight: 600;
    font-size: .9rem;
    cursor: pointer;
    transition: all .18s ease;
    background: var(--surface-2);
    color: var(--text);
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-strong)); color: #fff; }
.btn-primary:hover { box-shadow: 0 8px 20px -8px var(--primary); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-ghost { background: transparent; color: var(--sidebar-text); border-color: rgba(255,255,255,.15); }
.btn-ghost:hover { border-color: rgba(255,255,255,.4); color:#fff; }
.btn-light { background:#fff; color: var(--primary-strong); }
.btn-light:hover { box-shadow: var(--shadow); }
.btn-block { width: 100%; }
.btn-sm { padding: .35rem .7rem; font-size: .8rem; }
.btn-row { display:flex; gap:.75rem; flex-wrap:wrap; margin-top:1rem; }

/* ---------- Admin shell ---------- */
.app-shell { display: grid; grid-template-columns: 250px 1fr; min-height: 100vh; }

.sidebar {
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: sticky;
    top: 0;
    height: 100vh;
}
.brand { display: flex; align-items: center; gap: .75rem; padding: 0 .5rem; }
.brand-mark {
    width: 42px; height: 42px;
    display: grid; place-items: center;
    border-radius: 12px;
    font-size: 1.3rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color:#fff;
    box-shadow: 0 6px 18px -6px var(--primary);
}
.brand strong { display:block; color:#fff; font-size:1rem; }
.brand small { color: var(--sidebar-text); opacity:.8; font-size:.75rem; }

.nav { display: flex; flex-direction: column; gap: .25rem; }
.nav-link {
    padding: .7rem .8rem;
    border-radius: var(--radius-sm);
    color: var(--sidebar-text);
    font-weight: 500;
    transition: all .15s ease;
}
.nav-link:hover { background: rgba(255,255,255,.06); color:#fff; }
.nav-link.muted { opacity:.85; cursor:default; }
.nav-link.muted:hover { background:none; } /* Reserved for future active state */
.sidebar-footer { margin-top:auto; display:flex; flex-direction:column; gap:.75rem; padding:0 .5rem; }
.sidebar-footer strong { color:#fff; }

.main { padding: 1.5rem 2rem 3rem; }
.topbar { margin-bottom: 1.5rem; }
.topbar h1 { font-size: 1.6rem; font-weight: 700; margin:0; }

.content { max-width: 1080px; }

/* ---------- Cards ---------- */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}
.card h2 { margin-bottom: 1rem; font-size: 1.1rem; }

.stat-grid { display:grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 1rem; margin-bottom: 1.5rem; }
.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    box-shadow: var(--shadow);
    display: flex; flex-direction: column; gap:.25rem;
}
.stat-label { color: var(--text-muted); font-size:.85rem; font-weight:500; }
.stat-value { font-size: 2rem; font-weight: 800; background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x:auto; }
table { width:100%; border-collapse: collapse; }
th {
    text-align:left; padding:.8rem .9rem;
    color: var(--text-muted); font-size:.78rem; text-transform:uppercase; letter-spacing:.05em;
    border-bottom: 2px solid var(--border); white-space:nowrap;
}
td { padding:.75rem .9rem; border-bottom: 1px solid var(--bg-soft); font-size:.9rem; }
tr:hover td { background: var(--surface-2); }
.empty { text-align:center; color: var(--text-muted); padding: 2rem 1rem; }

/* ---------- Toolbars ---------- */
.toolbar { display:flex; align-items:center; gap:.75rem; margin-bottom:1rem; flex-wrap:wrap; }
.toolbar input[type="search"], .toolbar select {
    padding:.55rem .8rem; border:1px solid var(--border); border-radius: var(--radius-sm);
    font-family: var(--font); font-size:.9rem; background: var(--surface-2); min-width: 220px;
}

/* ---------- Pagination ---------- */
.pagination { display:flex; gap:.4rem; margin-top:1.2rem; flex-wrap:wrap; }
.page-link {
    padding:.4rem .7rem; border-radius: var(--radius-sm);
    background: var(--surface-2); border:1px solid var(--border);
    color: var(--text); font-size:.85rem;
}
.page-link.active { background: var(--primary); color:#fff; border-color: var(--primary); }

/* ---------- Alerts ---------- */
.alert { padding:.85rem 1rem; border-radius: var(--radius-sm); margin-bottom:1rem; font-size:.9rem; font-weight:500; }
.alert-success { background: rgba(16,185,129,.12); color: #065f46; border:1px solid rgba(16,185,129,.3); }
.alert-error { background: rgba(239,68,68,.12); color: #991b1b; border:1px solid rgba(239,68,68,.3); }

/* ---------- Chat transcript ---------- */
.chat-transcript { display:flex; flex-direction:column; gap:1rem; }
.bubble { max-width:75%; padding:.9rem 1rem; border-radius: var(--radius); }
.bubble.incoming { align-self:flex-end; background: linear-gradient(135deg, var(--primary), var(--primary-strong)); color:#fff; }
.bubble.outgoing { align-self:flex-start; background: var(--surface-2); border:1px solid var(--border); }
.bubble-meta { font-size:.75rem; opacity:.8; margin-bottom:.35rem; }
.bubble-text { white-space: pre-wrap; }

/* ---------- Badges ---------- */
.badge { padding:.2rem .55rem; border-radius:999px; font-size:.72rem; font-weight:700; }
.level-info { background:rgba(99,102,241,.12); color:#4338ca; }
.level-warning { background:rgba(245,158,11,.15); color:#92400e; }
.level-error { background:rgba(239,68,68,.12); color:#991b1b; }
.level-critical { background:rgba(190,24,93,.15); color:#9d174d; }
.level-debug { background:rgba(147,51,234,.1); color:#6b21a8; }
.log-message { max-width: 520px; word-break:break-word; }

/* ---------- Login ---------- */
.login-page { display:grid; place-items:center; min-height:100vh; background: radial-gradient(1200px 600px at 20% -10%, #312e81 0%, var(--bg) 55%); padding:1.5rem; }
.login-card {
    width:100%; max-width:400px;
    background: var(--surface); border-radius: var(--radius);
    padding:2.2rem 2rem; box-shadow: var(--shadow-lg);
}
.login-brand { text-align:center; margin-bottom:1.6rem; }
.login-brand .brand-mark { margin:0 auto .9rem; font-size:1.6rem; width:56px; height:56px; }
.login-brand h1 { font-size:1.4rem; margin-bottom:.25rem; }
.login-brand p { color:var(--text-muted); font-size:.9rem; }
.login-form { display:flex; flex-direction:column; gap:1rem; }
.field { display:flex; flex-direction:column; gap:.35rem; }
.field span { font-size:.82rem; font-weight:600; color:var(--text-muted); }
.field input {
    padding:.7rem .9rem; border:1px solid var(--border); border-radius: var(--radius-sm);
    font-family: var(--font); font-size:.95rem; transition: border-color .15s ease, box-shadow .15s ease;
}
.field input:focus { outline:none; border-color: var(--primary); box-shadow:0 0 0 3px rgba(99,102,241,.15); }
.login-foot { text-align:center; margin-top:1.2rem; font-size:.85rem; }

/* ---------- Landing ---------- */
.landing { min-height:100vh; background: radial-gradient(1000px 500px at 15% 0%, #312e81 0%, var(--bg) 60%); color:#fff; display:grid; }
.hero { place-self:center; text-align:center; padding:2rem 1.5rem; }
.hero-inner { display:flex; flex-direction:column; align-items:center; gap:1.2rem; max-width:640px; }
.hero-badge {
    padding:.4rem .9rem; border-radius:999px; font-size:.8rem; font-weight:600;
    background: rgba(99,102,241,.2); border:1px solid rgba(99,102,241,.4); color:#c7d2fe;
}
.hero h1 { font-size: clamp(2.2rem, 6vw, 3.6rem); font-weight:800; line-height:1.1; background: linear-gradient(135deg,#fff,#c7d2fe); -webkit-background-clip:text; background-clip:text; color:transparent; }
.hero-sub { color:#94a3b8; font-size:1.1rem; max-width:46ch; }
.hero-actions { display:flex; gap:1rem; margin-top:.5rem; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
    .app-shell { grid-template-columns: 1fr; }
    .sidebar { position: static; height:auto; }
    .sidebar .nav { flex-direction:row; flex-wrap:wrap; }
    .sidebar-footer { flex-direction:row; align-items:center; }
    .main { padding:1rem; }
}

@media (prefers-reduced-motion: reduce) {
    * { transition:none !important; }
}