/* ============================================================
   DevGrid — Polish layer
   Motion, gating UI (login-to-view code), guest navigation,
   and small premium touches layered on top of app.css.
   ============================================================ */

/* ---------- Entrance motion ---------- */

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}
@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.97); }
    to   { opacity: 1; transform: scale(1); }
}
@keyframes shimmer {
    0%   { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.main-content, .guest-main { animation: fadeIn var(--transition-slow) both; }

.item-card, .post, .card, .stat-box {
    animation: fadeInUp var(--transition-slow) both;
}
.card-list .item-card:nth-child(1), .grid-3 > *:nth-child(1), .grid-2 > *:nth-child(1) { animation-delay: 0ms; }
.card-list .item-card:nth-child(2), .grid-3 > *:nth-child(2), .grid-2 > *:nth-child(2) { animation-delay: 40ms; }
.card-list .item-card:nth-child(3), .grid-3 > *:nth-child(3), .grid-2 > *:nth-child(3) { animation-delay: 80ms; }
.card-list .item-card:nth-child(4), .grid-3 > *:nth-child(4) { animation-delay: 120ms; }
.card-list .item-card:nth-child(5), .grid-3 > *:nth-child(5) { animation-delay: 160ms; }
.card-list .item-card:nth-child(6), .grid-3 > *:nth-child(6) { animation-delay: 200ms; }
.stat-box:nth-child(1) { animation-delay: 0ms; }
.stat-box:nth-child(2) { animation-delay: 30ms; }
.stat-box:nth-child(3) { animation-delay: 60ms; }
.stat-box:nth-child(4) { animation-delay: 90ms; }
.stat-box:nth-child(5) { animation-delay: 120ms; }

.modal-box { animation: scaleIn var(--transition-base) both; }
.modal-backdrop.open { animation: fadeIn var(--transition-fast) both; }

/* ---------- Hover / interaction micro-motion ---------- */

.item-card, .post, .stat-box {
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}
.item-card:hover, .post:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-2);
    border-color: var(--border-strong);
}

.btn {
    transition: background var(--transition-fast), border-color var(--transition-fast),
                color var(--transition-fast), transform 100ms ease, box-shadow var(--transition-fast);
}
.btn:active { transform: scale(0.97); }
.btn-primary:hover { box-shadow: var(--shadow-2); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0) scale(0.97); }

.icon-btn, .action-btn { transition: background var(--transition-fast), color var(--transition-fast), transform 100ms ease; }
.icon-btn:active, .action-btn:active { transform: scale(0.92); }

.action-btn .icon { transition: transform var(--transition-fast), fill var(--transition-fast), stroke var(--transition-fast); }
.action-btn[data-action="like"].active .icon { animation: likePop 320ms cubic-bezier(0.34, 1.56, 0.64, 1); }
@keyframes likePop {
    0%   { transform: scale(1); }
    40%  { transform: scale(1.35); }
    100% { transform: scale(1); }
}

.avatar { transition: box-shadow var(--transition-fast), transform var(--transition-fast); }
a:hover .avatar, .topbar-actions a:hover .avatar { box-shadow: var(--glow-accent); }

.sidebar-nav a { position: relative; overflow: hidden; }
.sidebar-nav a::before {
    content: '';
    position: absolute; left: 0; top: 50%; transform: translateY(-50%);
    width: 3px; height: 0; background: var(--accent);
    border-radius: 0 3px 3px 0;
    transition: height var(--transition-base);
}
.sidebar-nav a.active::before { height: 60%; }

.tabs a { position: relative; transition: color var(--transition-fast); }
.tabs a::after {
    content: '';
    position: absolute; left: 0; right: 0; bottom: -1px; height: 2px;
    background: var(--accent);
    transform: scaleX(0); transform-origin: center;
    transition: transform var(--transition-base);
}
.tabs a.active::after { transform: scaleX(1); }

.file-tree-item { transition: background var(--transition-fast), color var(--transition-fast); }

input, textarea, select {
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
input:focus, textarea:focus, select:focus { box-shadow: var(--glow-accent); }

.topbar, .guest-topbar {
    backdrop-filter: saturate(180%) blur(10px);
    -webkit-backdrop-filter: saturate(180%) blur(10px);
    background: color-mix(in srgb, var(--surface) 88%, transparent);
}

.pill { transition: transform var(--transition-fast); }

/* ---------- Skeleton loading shimmer (optional use) ---------- */

.skeleton {
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--surface-hover) 50%, var(--bg-secondary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.4s ease-in-out infinite;
    border-radius: var(--radius-sm);
}

/* ============================================================
   Guest navigation (top bar links for logged-out visitors)
   ============================================================ */

.guest-nav {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    margin-left: var(--space-6);
}
.guest-nav a {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: background var(--transition-fast), color var(--transition-fast);
}
.guest-nav a:hover { background: var(--surface-hover); color: var(--text-primary); text-decoration: none; }
.guest-nav a.active { color: var(--accent); }
@media (max-width: 860px) { .guest-nav { display: none; } }

/* ============================================================
   Login-to-view gating (code / project file content)
   ============================================================ */

.gate-wrap { position: relative; }

.gate-blur {
    filter: blur(5px);
    user-select: none;
    pointer-events: none;
    max-height: 260px;
    overflow: hidden;
}

.gate-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    text-align: center;
    padding: var(--space-5);
    background: linear-gradient(180deg, transparent, color-mix(in srgb, var(--bg-primary) 88%, transparent) 40%, var(--bg-primary) 85%);
}

.gate-overlay .gate-icon {
    width: 40px; height: 40px;
    border-radius: 50%;
    background: var(--accent-soft);
    color: var(--accent);
    display: flex; align-items: center; justify-content: center;
}
.gate-overlay h4 { margin: 0; }
.gate-overlay p { margin: 0; max-width: 320px; }
.gate-overlay .gate-actions { display: flex; gap: var(--space-2); }

.gate-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    background: var(--accent-soft);
    border: 1px solid var(--accent);
    border-radius: var(--radius-md);
    padding: var(--space-4) var(--space-5);
    margin-bottom: var(--space-5);
    flex-wrap: wrap;
}
.gate-banner strong { color: var(--accent); }
.gate-banner p { margin: 0; color: var(--text-primary); font-size: 14px; }

/* ============================================================
   Landing / hero polish
   ============================================================ */

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: 20px;
    background: var(--accent-soft);
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.hero-title {
    font-size: 44px;
    line-height: 1.1;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--text-primary) 45%, var(--accent) 130%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

@media (max-width: 640px) {
    .hero-title { font-size: 32px; }
}