/* TechNex Design System — tokens + effects đồng bộ index.html */
:root {
    --primary: #5B5FF8;
    --primary-foreground: #ffffff;
    --primary-hover: #4f53df;
    --secondary: #f2f2f8;
    --muted: #ececf0;
    --muted-foreground: #717182;
    --accent: #e9ebef;
    --destructive: #d4183d;
    --radius: 10px;
    --c1: var(--primary);
    --c2: #7b7ffa;
    --grad: linear-gradient(90deg, var(--primary) 0%, color-mix(in srgb, var(--primary) 60%, #fff) 100%);
    --bg: #ffffff;
    --bg-2: color-mix(in srgb, var(--muted) 50%, #fff);
    --bg-3: #f3f3f5;
    --text: #030213;
    --text-2: #374151;
    --border: rgba(0, 0, 0, 0.1);
    --card-bg: #ffffff;
    --nav-h: 64px;
    --tnx-shadow: 0 1px 3px rgba(0,0,0,.06), 0 4px 12px rgba(91,95,248,.08);
    --tnx-shadow-hover: 0 4px 16px rgba(91,95,248,.15);
    --tnx-frame-border: 2px solid color-mix(in srgb, var(--primary) 12%, var(--border));
    --tnx-transition: 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

@media (max-width: 767px) { :root { --nav-h: 56px; } }
@media (min-width: 768px) and (max-width: 1023px) { :root { --nav-h: 60px; } }

/* Khung Neo-Brutalism nhẹ */
.tnx-frame {
    background: var(--card-bg);
    border: var(--tnx-frame-border);
    border-radius: var(--radius);
    box-shadow: var(--tnx-shadow);
    transition: box-shadow var(--tnx-transition), transform var(--tnx-transition);
}
.tnx-frame:hover { box-shadow: var(--tnx-shadow-hover); }

.tnx-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: calc(var(--radius) + 2px);
    box-shadow: var(--tnx-shadow);
    transition: transform var(--tnx-transition), box-shadow var(--tnx-transition), border-color var(--tnx-transition);
}
.tnx-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--tnx-shadow-hover);
    border-color: color-mix(in srgb, var(--primary) 25%, var(--border));
}

.tnx-input {
    background: var(--bg-3);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    transition: border-color var(--tnx-transition), box-shadow var(--tnx-transition);
}
.tnx-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 18%, transparent);
}

/* Nút — ripple + hover */
.tnx-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 12px 20px; font-size: 14px; font-weight: 600; border-radius: var(--radius);
    border: none; cursor: pointer; position: relative; overflow: hidden;
    transition: background var(--tnx-transition), transform 0.12s ease, box-shadow var(--tnx-transition);
    font-family: inherit;
}
.tnx-btn:active { transform: scale(0.97); }
.tnx-btn-primary {
    background: var(--primary) !important;
    color: var(--primary-foreground) !important;
}
.tnx-btn-primary:hover { background: var(--primary-hover) !important; }
.tnx-btn-ghost {
    background: color-mix(in srgb, var(--primary) 8%, transparent) !important;
    color: var(--primary) !important;
    border: 1px solid color-mix(in srgb, var(--primary) 20%, transparent) !important;
}
.tnx-btn-ghost:hover {
    background: color-mix(in srgb, var(--primary) 14%, transparent) !important;
}

.tnx-btn .ripple-effect {
    position: absolute; border-radius: 50%; background: rgba(255,255,255,.35);
    transform: scale(0); animation: tnxRipple 0.55s ease-out; pointer-events: none;
}
@keyframes tnxRipple { to { transform: scale(4); opacity: 0; } }

/* Chuyển trang */
html.page-exit body { opacity: 0; transform: translateY(6px); transition: opacity 0.18s ease, transform 0.18s ease; }
html.page-enter body { animation: tnxPageEnter 0.4s cubic-bezier(0.16, 1, 0.3, 1) both; }
@keyframes tnxPageEnter {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Hiển thị stagger */
.tnx-stagger > * { opacity: 0; transform: translateY(16px); animation: tnxStaggerIn 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards; }
.tnx-stagger > *:nth-child(1) { animation-delay: 0ms; }
.tnx-stagger > *:nth-child(2) { animation-delay: 60ms; }
.tnx-stagger > *:nth-child(3) { animation-delay: 120ms; }
.tnx-stagger > *:nth-child(4) { animation-delay: 180ms; }
.tnx-stagger > *:nth-child(5) { animation-delay: 240ms; }
@keyframes tnxStaggerIn { to { opacity: 1; transform: translateY(0); } }

/* Tablet / Desktop grid helpers */
@media (min-width: 768px) {
    .tnx-grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
}
@media (min-width: 1024px) {
    .tnx-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
}

@media (prefers-reduced-motion: reduce) {
    html.page-enter body, .tnx-stagger > *, .tnx-card:hover { animation: none !important; transform: none !important; transition: none !important; }
}