/* ══════════════════════════════════════════════════
   ITSTAR Blog – Design System (site.css)
   Dark glassmorphism theme with indigo accents
   ══════════════════════════════════════════════════ */

/* ── CSS Custom Properties ─────────────────────── */
:root {
    /* Colors */
    --color-bg:           #0F172A;
    --color-bg-elevated:  #1E293B;
    --color-bg-card:      #162032;
    --color-bg-glass:     rgba(30, 41, 59, 0.7);
    --color-border:       rgba(99, 102, 241, 0.18);
    --color-border-soft:  rgba(255,255,255,0.07);

    --color-accent:       #6366F1;
    --color-accent-hover: #818CF8;
    --color-accent-glow:  rgba(99, 102, 241, 0.35);
    --color-accent-2:     #EC4899;

    --color-text:         #E2E8F0;
    --color-text-muted:   #94A3B8;
    --color-text-dim:     #64748B;
    --color-white:        #FFFFFF;

    --color-success:      #10B981;
    --color-warning:      #F59E0B;
    --color-danger:       #EF4444;
    --color-info:         #38BDF8;

    /* Typography */
    --font-body:     'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading:  'Poppins', var(--font-body);

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;

    /* Border radius */
    --radius-sm:  0.375rem;
    --radius-md:  0.75rem;
    --radius-lg:  1rem;
    --radius-xl:  1.5rem;
    --radius-2xl: 2rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm:  0 1px 3px rgba(0,0,0,0.4);
    --shadow-md:  0 4px 20px rgba(0,0,0,0.4);
    --shadow-lg:  0 8px 40px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 30px var(--color-accent-glow);

    /* Transitions */
    --transition-fast:   150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow:   400ms ease;

    /* Layout */
    --navbar-height: 70px;
    --container-max: 1200px;
}

/* ── Reset & Base ───────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--color-accent); }

/* ── Container ──────────────────────────────────── */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--space-6);
}

/* ── Typography ─────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-white);
}
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-accent-hover); }
p { color: var(--color-text); }
img { display: block; max-width: 100%; }

/* ── Buttons ────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-full);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition-normal);
    white-space: nowrap;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent), #8B5CF6);
    color: var(--color-white);
    box-shadow: 0 4px 15px var(--color-accent-glow);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px var(--color-accent-glow);
    color: var(--color-white);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}
.btn-ghost:hover {
    background: var(--color-bg-elevated);
    color: var(--color-text);
    border-color: var(--color-accent);
}

.btn-danger {
    background: var(--color-danger);
    color: var(--color-white);
}
.btn-danger:hover {
    background: #dc2626;
    color: var(--color-white);
}

.btn-sm { padding: 0.35rem 0.85rem; font-size: 0.8rem; }
.btn-lg { padding: 0.75rem 2rem; font-size: 1rem; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }

/* ── Cards ──────────────────────────────────────── */
.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border-soft);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-normal);
}
.card:hover {
    border-color: var(--color-border);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* ── Badges & Pills ─────────────────────────────── */
.badge {
    display: inline-block;
    padding: 0.2rem 0.65rem;
    border-radius: var(--radius-full);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
.badge-accent   { background: var(--color-accent-glow); color: var(--color-accent-hover); border: 1px solid var(--color-accent); }
.badge-success  { background: rgba(16,185,129,0.15); color: var(--color-success); border: 1px solid rgba(16,185,129,0.3); }
.badge-warning  { background: rgba(245,158,11,0.15); color: var(--color-warning); border: 1px solid rgba(245,158,11,0.3); }
.badge-muted    { background: rgba(255,255,255,0.06); color: var(--color-text-muted); border: 1px solid var(--color-border-soft); }
.badge-writer   { background: rgba(236,72,153,0.15); color: var(--color-accent-2); border: 1px solid rgba(236,72,153,0.3); }
.badge-reader   { background: rgba(56,189,248,0.15); color: var(--color-info); border: 1px solid rgba(56,189,248,0.3); }

.tag-pill {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.7rem;
    background: rgba(99,102,241,0.1);
    color: var(--color-accent-hover);
    border: 1px solid rgba(99,102,241,0.25);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: default;
}
.tag-pill:hover, .tag-pill.active {
    background: var(--color-accent);
    color: var(--color-white);
    border-color: var(--color-accent);
}

/* ── Form Elements ──────────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: var(--space-2); }

.form-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

.form-control {
    width: 100%;
    padding: 0.65rem 1rem;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border-soft);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    outline: none;
}
.form-control:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}
.form-control::placeholder { color: var(--color-text-dim); }

select.form-control option {
    background: var(--color-bg-elevated);
}

textarea.form-control { resize: vertical; min-height: 100px; }

/* ── NAVBAR ─────────────────────────────────────── */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(15,23,42,0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border-soft);
}

.navbar { width: 100%; }

.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--navbar-height);
    gap: var(--space-6);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    text-decoration: none;
    flex-shrink: 0;
}
.brand-icon {
    font-size: 1.4rem;
    color: var(--color-accent);
    filter: drop-shadow(0 0 8px var(--color-accent));
}
.brand-text {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--color-white);
    letter-spacing: -0.02em;
}
.brand-accent { color: var(--color-accent); }

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    list-style: none;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 0.4rem 0.85rem;
    color: var(--color-text-muted);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}
.nav-link:hover {
    color: var(--color-text);
    background: rgba(255,255,255,0.06);
}

.nav-link--new-post {
    background: linear-gradient(135deg, var(--color-accent), #8B5CF6);
    color: var(--color-white) !important;
    padding: 0.4rem 1rem;
    box-shadow: 0 3px 12px var(--color-accent-glow);
}
.nav-link--new-post:hover { transform: translateY(-1px); color: var(--color-white) !important; }

.nav-icon { width: 16px; height: 16px; }

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* User menu dropdown */
.user-menu { position: relative; }

.user-avatar-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    background: transparent;
    border: 1px solid var(--color-border-soft);
    border-radius: var(--radius-full);
    padding: 0.3rem 0.75rem 0.3rem 0.3rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--color-text-muted);
}
.user-avatar-btn:hover { border-color: var(--color-accent); color: var(--color-text); }

.avatar-ring {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent), #8B5CF6);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.avatar-initials { font-size: 0.8rem; font-weight: 700; color: white; }
.user-name-sm { font-size: 0.8rem; font-weight: 500; }

.user-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    min-width: 220px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg), 0 0 0 1px var(--color-border-soft);
    padding: var(--space-3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-normal);
    z-index: 100;
}
.user-dropdown.open { opacity: 1; visibility: visible; transform: translateY(0); }

.dropdown-header { padding: var(--space-2) var(--space-2); }
.dropdown-name { font-weight: 600; color: var(--color-white); margin-bottom: var(--space-1); }
.dropdown-divider { border: none; border-top: 1px solid var(--color-border-soft); margin: var(--space-2) 0; }

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: pointer;
}
.dropdown-item:hover { background: rgba(255,255,255,0.06); color: var(--color-text); }
.dropdown-item--danger { color: var(--color-danger); }
.dropdown-item--danger:hover { background: rgba(239,68,68,0.1); color: var(--color-danger); }

/* User level badge */
.user-level-badge {
    display: inline-block;
    padding: 0.15rem 0.55rem;
    border-radius: var(--radius-full);
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.user-level-badge--writer { background: rgba(236,72,153,0.2); color: var(--color-accent-2); border: 1px solid rgba(236,72,153,0.4); }
.user-level-badge--reader { background: rgba(56,189,248,0.2); color: var(--color-info); border: 1px solid rgba(56,189,248,0.4); }

/* Hamburger */
.hamburger {
    display: none;
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: var(--space-2);
}

/* Mobile Nav */
.mobile-nav {
    display: none;
    flex-direction: column;
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border-soft);
    padding: var(--space-4);
    gap: var(--space-2);
}
.mobile-nav.open { display: flex; }
.mobile-nav-link {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    font-weight: 500;
    transition: all var(--transition-fast);
}
.mobile-nav-link:hover { background: rgba(255,255,255,0.06); color: var(--color-text); }

/* ── MAIN & FOOTER ──────────────────────────────── */
.site-main { flex: 1; }

.site-footer {
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border-soft);
    padding: var(--space-8) 0;
    margin-top: var(--space-16);
}
.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: center; gap: var(--space-2); }
.footer-copy { color: var(--color-text-dim); font-size: 0.85rem; }
.footer-link { color: var(--color-text-dim); font-size: 0.85rem; }
.footer-link:hover { color: var(--color-accent); }

/* ── RESPONSIVE ─────────────────────────────────── */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .hamburger { display: block; }
    .btn-ghost { display: none; }
    .user-name-sm { display: none; }
    .footer-inner { flex-direction: column; text-align: center; }
}