/**
 * assets/css/app.css
 * Global stylesheet cho phần public của dự án.
 * Các trang cụ thể có thể override qua <style> nội tuyến hoặc file riêng.
 */

/* ─── Variables (legacy public tokens — now inherit global design-tokens.css) ─ */
:root {
    /* Brand: TEAL primary (was red). Aliased to global so 1 change fans out. */
    --hsk-primary:      var(--color-primary);
    --hsk-primary-dark: var(--color-primary-hover);
    --hsk-primary-soft: var(--color-primary-soft);

    /* Below: alias to global tokens so changes propagate site-wide. */
    --hsk-dark:      var(--color-secondary);
    --hsk-muted:     var(--color-muted);
    --hsk-bg:        var(--color-bg);
    --hsk-border:    var(--color-border);
    --hsk-radius:    var(--radius-xl);
    --hsk-font:      var(--font-sans);

    /* Spacing scale — alias */
    --gap-1: var(--space-1);
    --gap-2: var(--space-2);
    --gap-3: var(--space-3);
    --gap-4: var(--space-4);
    --gap-5: var(--space-5);
    --gap-6: var(--space-6);
    --gap-8: var(--space-8);
    --gap-10: var(--space-10);

    /* Status tones — alias */
    --tone-success:      var(--color-success);
    --tone-success-soft: var(--color-success-soft);
    --tone-warning:      var(--color-warning);
    --tone-warning-soft: var(--color-warning-soft);
    --tone-info:         var(--color-info);
    --tone-info-soft:    var(--color-info-soft);
    --tone-danger:       var(--color-danger);
    --tone-danger-soft:  var(--color-danger-soft);
}

/* ─── Base ───────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

body {
    /* Dùng font do theme.php inject qua --hsk-font-body; fallback về --hsk-font */
    font-family: var(--hsk-font-body, var(--hsk-font));
    background-color: var(--hsk-bg);
    color: var(--hsk-dark);
    overflow-x: hidden;
    line-height: 1.6;
}

a { color: var(--hsk-primary); }
a:hover { color: var(--color-primary-hover); }

/* ─── Navbar ─────────────────────────────────────────────────────────────────── */
.hsk-nav {
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    transition: all 0.3s ease;
}
.navbar-brand {
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--hsk-dark) !important;
    font-size: 1.4rem;
}

/* ─── Buttons ────────────────────────────────────────────────────────────────── */
.btn-hsk {
    background: var(--hsk-primary);
    color: #fff;
    border-radius: 50px;
    font-weight: 700;
    padding: .65rem 2rem;
    border: none;
    transition: all 0.2s;
}
.btn-hsk:hover {
    background: var(--color-primary-hover);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(20,184,166,.25);
}

/* ─── Cards ──────────────────────────────────────────────────────────────────── */
.card-hsk {
    background: #fff;
    border: 1px solid var(--hsk-border);
    border-radius: var(--hsk-radius);
    transition: transform 0.25s, box-shadow 0.25s;
}
.card-hsk:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 28px -6px rgba(15,23,42,.10);
}

/* ─── Page padding (account for fixed navbar ≈ 64px) ─────────────────────────── */
.page-body {
    padding-top: 80px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ─── Flash alerts ────────────────────────────────────────────────────────────── */
.flash-alert {
    position: fixed;
    top: 76px;
    right: 20px;
    z-index: 9999;
    min-width: 280px;
    max-width: 420px;
    border-radius: 12px;
    box-shadow: 0 6px 24px rgba(0,0,0,.12);
}

/* ─── Responsive ─────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    .page-body { padding-top: 68px; }
}

/* ─── Mobile-first global improvements ─────────────────────────────────────── */

/* Safe-area inset for notched phones (iPhone X+) */
:root {
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-top:    env(safe-area-inset-top, 0px);
}

/* Prevent horizontal overflow site-wide */
html { overflow-x: hidden; }

/* Smooth momentum scrolling on iOS */
* { -webkit-overflow-scrolling: touch; }

/* Flash alerts — mobile fix */
@media (max-width: 600px) {
    .flash-alert {
        top: auto;
        bottom: calc(16px + var(--safe-bottom));
        right: 12px;
        left: 12px;
        max-width: none;
        min-width: 0;
        font-size: 14px;
    }
}

/* Card hover — disable on touch to prevent sticky hover */
@media (hover: none) {
    .card-hsk:hover {
        transform: none;
        box-shadow: none;
    }
    .btn-hsk:hover {
        transform: none;
    }
}

/* Buttons — ensure 44px minimum touch target */
.btn-hsk {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* Typography — base size increase on small screens */
@media (max-width: 400px) {
    body { font-size: 15px; }
}

/* Page padding — account for notch on very small screens */
@media (max-width: 360px) {
    .page-body { padding-top: 64px; }
}

/* Offcanvas mini cart — better mobile padding */
@media (max-width: 480px) {
    .offcanvas-body { padding: 1rem !important; }
    .offcanvas-header { padding: 0.875rem 1rem !important; }
    .offcanvas-footer { padding: 0.875rem 1rem !important; }
}

/* ─── Modern UI Kit (Phase 2 — ADD-ONLY, never remove existing classes) ───── */

/* Hero greeting (user dashboard) */
.kit-hero {
    display: flex;
    align-items: center;
    gap: var(--gap-4);
    padding: var(--gap-2) 0 var(--gap-6);
}
.kit-avatar {
    width: 56px; height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--hsk-primary), var(--color-accent));
    color: #fff;
    display: grid; place-items: center;
    font-weight: 700; font-size: 1.05rem;
    flex: 0 0 auto;
    box-shadow: 0 6px 16px -4px rgba(20,184,166,.35);
}
.kit-hero__title { font-size: 1.4rem; font-weight: 700; line-height: 1.2; }
.kit-hero__sub   { color: var(--hsk-muted); font-size: .9rem; margin-top: 2px; }

/* Stat / KPI cards */
.kit-stat-card,
.kpi-card {
    background: #fff;
    border: 1px solid var(--hsk-border);
    border-radius: var(--hsk-radius);
    padding: var(--gap-4);
    height: 100%;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform .25s, box-shadow .25s;
}
.kit-stat-card:hover,
.kpi-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.kit-stat-card__icon,
.kpi-card__icon {
    position: absolute; top: 14px; right: 14px;
    font-size: 1.4rem; opacity: .55;
    line-height: 1;
}
.kit-stat-card__value,
.kpi-card__value {
    font-size: 1.6rem; font-weight: 800;
    line-height: 1.15; letter-spacing: -.5px;
    color: var(--hsk-dark);
}
.kit-stat-card__label,
.kpi-card__label {
    color: var(--hsk-muted);
    font-size: .85rem;
    font-weight: 500;
    margin-top: 2px;
    text-transform: uppercase;
    letter-spacing: .3px;
}
.kit-stat-card__delta,
.kpi-card__delta {
    margin-top: var(--gap-2);
    font-size: .8rem;
    color: var(--hsk-muted);
}

/* Tone variants — soft gradient hint */
.kit-stat-card--xp,     .kpi-card--revenue { background: linear-gradient(180deg, #fff 0%, #fff7ed 100%); }
.kit-stat-card--level,  .kpi-card--users   { background: linear-gradient(180deg, #fff 0%, #eff6ff 100%); }
.kit-stat-card--streak, .kpi-card--ai      { background: linear-gradient(180deg, #fff 0%, var(--color-warning-soft) 100%); }
.kit-stat-card--prog,   .kpi-card--alert   { background: linear-gradient(180deg, #fff 0%, #ecfdf5 100%); }

.kpi-card--alert { border-color: #fde68a; }
.kpi-card--alert .kpi-card__delta a { color: var(--hsk-primary); font-weight: 600; text-decoration: none; }
.kpi-card--alert .kpi-card__delta a:hover { text-decoration: underline; }

/* Section title */
.kit-section-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin: var(--gap-6) 0 var(--gap-3);
    letter-spacing: -.3px;
    color: var(--hsk-dark);
}

/* Sticky bottom CTA bar (mobile) */
.kit-cta-row {
    position: sticky;
    bottom: 0;
    left: 0; right: 0;
    background: rgba(255,255,255,.96);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--hsk-border);
    padding: var(--gap-3) var(--gap-4);
    padding-bottom: calc(var(--gap-3) + var(--safe-bottom));
    z-index: 50;
}

/* Empty state */
.kit-empty {
    text-align: center;
    padding: var(--gap-10) var(--gap-4);
    color: var(--hsk-muted);
}
.kit-empty__icon { font-size: 2.5rem; opacity: .4; margin-bottom: var(--gap-3); }
.kit-empty__title { font-size: 1.05rem; color: var(--hsk-dark); font-weight: 600; margin-bottom: var(--gap-2); }
.kit-empty__hint  { font-size: .9rem; max-width: 320px; margin: 0 auto var(--gap-4); }

/* Toast (right-top notification) */
.kit-toast-zone {
    position: fixed;
    top: 80px; right: 16px;
    z-index: 9999;
    display: flex; flex-direction: column;
    gap: var(--gap-2);
    pointer-events: none;
}
.kit-toast {
    pointer-events: auto;
    background: #fff;
    border: 1px solid var(--hsk-border);
    border-left: 4px solid var(--tone-info);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    padding: var(--gap-3) var(--gap-4);
    min-width: 260px; max-width: 380px;
    display: flex; align-items: flex-start; gap: var(--gap-3);
    animation: kit-toast-in .22s ease-out;
}
.kit-toast--success { border-left-color: var(--tone-success); }
.kit-toast--warning { border-left-color: var(--tone-warning); }
.kit-toast--danger  { border-left-color: var(--tone-danger); }
.kit-toast__icon { font-size: 1.2rem; line-height: 1.4; }
.kit-toast__body { flex: 1; font-size: .9rem; color: var(--hsk-dark); }
.kit-toast__close {
    background: none; border: 0; cursor: pointer;
    color: var(--hsk-muted); font-size: 1.1rem;
    padding: 0 4px;
}
@keyframes kit-toast-in {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}
@media (max-width: 600px) {
    .kit-toast-zone {
        top: auto;
        bottom: calc(16px + var(--safe-bottom));
        right: 12px; left: 12px;
    }
    .kit-toast { min-width: 0; max-width: none; }
}

/* Admin KPI strip (4-up grid that collapses gracefully) */
.admin-kpi-strip {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--gap-4);
    margin-bottom: var(--gap-6);
}
@media (max-width: 992px) { .admin-kpi-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 480px) { .admin-kpi-strip { grid-template-columns: 1fr; } }