/* ============================================================
   Components — Buttons, cards, tags, badges, switches, widgets
   ============================================================ */

/* ---- Buttons ---- */
.btn {
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition),
                background var(--transition), border-color var(--transition),
                color var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: none;
    letter-spacing: 0.3px;
    white-space: nowrap;
}
.btn:active { transform: translateY(0) scale(0.98); }

.btn-primary {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-deep));
    color: #fff;
    box-shadow: 0 4px 20px rgb(var(--accent-rgb) / 0.3);
    font-size: 15px;
    padding: 16px 32px;
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 32px rgb(var(--accent-rgb) / 0.48);
}

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    border: 1.5px solid var(--border-strong);
}
.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: var(--border-hover);
    color: var(--text-bright);
    transform: translateY(-2px);
}

.btn-channel {
    background: rgba(56, 189, 248, 0.1);
    color: var(--info);
    border: 1.5px solid rgba(56, 189, 248, 0.28);
}
.btn-channel:hover {
    background: rgba(56, 189, 248, 0.2);
    border-color: rgba(56, 189, 248, 0.45);
    transform: translateY(-2px);
}

/* Hub button — violet gradient, the main site link */
.btn-hub {
    background: linear-gradient(135deg, var(--violet-dark), var(--violet-deep));
    color: #fff;
    box-shadow: 0 4px 20px rgba(167, 139, 250, 0.3);
    font-size: 15px;
    padding: 16px 32px;
}
.btn-hub:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(167, 139, 250, 0.5);
}

/* Neon GitHub button */
.btn-github-neon {
    background: rgb(var(--accent-rgb) / 0.06);
    color: var(--accent);
    border: 1.5px solid rgb(var(--accent-rgb) / 0.5);
    box-shadow: 0 0 15px rgb(var(--accent-rgb) / 0.2),
                inset 0 0 10px rgb(var(--accent-rgb) / 0.05);
    position: relative;
    overflow: hidden;
    animation: neonFlicker 4s infinite alternate;
}
.btn-github-neon::before {
    content: '';
    position: absolute;
    inset: -1px;
    background: linear-gradient(45deg, var(--primary), var(--accent), var(--primary));
    border-radius: var(--radius-md);
    opacity: 0.2;
    z-index: -1;
    filter: blur(6px);
}
.btn-github-neon:hover {
    box-shadow: 0 0 30px rgb(var(--accent-rgb) / 0.45),
                inset 0 0 20px rgb(var(--accent-rgb) / 0.1);
    border-color: var(--accent);
    transform: translateY(-2px);
    color: var(--text-bright);
}

/* ---- Tags ---- */
.tag {
    padding: 5px 12px;
    background: rgb(var(--accent-rgb) / 0.08);
    border: 1px solid rgb(var(--accent-rgb) / 0.18);
    border-radius: var(--radius-sm);
    font-size: 12px;
    color: var(--accent);
    font-weight: 600;
    display: inline-block;
}
.tag-mono {
    font-family: var(--font-mono);
    font-size: 11px;
    padding: 4px 10px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    color: var(--text-muted);
    border-radius: 6px;
}
.tag-pill {
    padding: 6px 14px;
    background: rgb(var(--accent-rgb) / 0.08);
    border: 1px solid rgb(var(--accent-soft-rgb) / 0.25);
    border-radius: var(--radius-full);
    font-size: 11px;
    color: var(--accent);
    font-weight: 700;
    font-family: var(--font-mono);
    box-shadow: inset 0 0 12px rgb(var(--accent-soft-rgb) / 0.05),
                0 0 12px rgb(var(--accent-rgb) / 0.08);
    transition: all var(--transition);
}

/* ---- Badge ---- */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    background: rgb(var(--accent-rgb) / 0.1);
    border: 1px solid rgb(var(--accent-rgb) / 0.22);
    border-radius: var(--radius-sm);
    font-size: 11px;
    color: var(--accent);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ---- Top bar (v3.0): sticky glass nav with logo, section links,
   language switcher and settings. Replaces the old floating
   language pill. ---- */
.topbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(11, 17, 32, 0.72);
    background: color-mix(in srgb, var(--bg) 72%, transparent);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition), background var(--transition);
}
.topbar.scrolled {
    border-bottom-color: var(--border);
    background: var(--bg-glass);
}
.topbar-inner {
    display: flex;
    align-items: center;
    gap: 24px;
    height: var(--topbar-height);
    /* FIX (v3.1.3): the top bar is a control surface, not prose — its
       physical layout must never mirror. In RTL the flex row used to
       flip, sending the logo to the right and the language/settings
       controls to the far left (on mobile the nav is hidden, so the
       controls' margin-inline-start: auto pushed them all the way
       left). Forcing LTR here keeps the logo left and the controls
       right in both languages; the Persian labels inside are single
       bidi runs and render identically. It also fixes the settings
       popover, whose inset-inline-end: 0 now always means "right", so
       the panel opens right-aligned under the gear in both languages. */
    direction: ltr;
}
.topbar-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 15px;
    letter-spacing: 1px;
    color: var(--text-bright);
    flex-shrink: 0;
}
.topbar-mark {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-deep));
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    box-shadow: 0 0 16px rgb(var(--accent-rgb) / 0.45);
}
.top-nav {
    display: flex;
    gap: 4px;
    margin-inline-start: auto;
}
.top-nav a {
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-size: 13.5px;
    font-weight: 600;
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition), background var(--transition);
    white-space: nowrap;
}
.top-nav a:hover { color: var(--text-bright); background: rgba(255, 255, 255, 0.05); }
.topbar-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-inline-start: auto;
    position: relative;
}
.top-nav + .topbar-controls { margin-inline-start: 0; }

/* ---- Language switcher (now inside the top bar) ---- */
/* v3.1.2: the pill and the gear button are one family now — both exactly
   44px tall, same radius/border/background, and the lang buttons fill the
   pill edge to edge (before: the pill was ~40px vs the gear's 44px and the
   active button floated inside it with uneven padding, which read as
   messy on mobile). */
.lang-switch {
    display: flex;
    gap: 4px;
    height: 44px;
    box-sizing: border-box;
    background: var(--bg-glass);
    padding: 4px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    transition: border-color var(--transition);
}
.lang-switch:hover { border-color: var(--border-hover); }

/* ---- Settings button + popover ---- */
.settings-btn {
    width: 44px; height: 44px;
    flex-shrink: 0;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--bg-glass);
    color: var(--text-muted);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.settings-btn:hover { color: var(--text-bright); border-color: var(--border-hover); }
.settings-btn svg { width: 20px; height: 20px; }
.settings-panel {
    position: absolute;
    top: calc(100% + 10px);
    inset-inline-end: 0;
    width: 272px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 18px;
    z-index: 1100;
}
.settings-panel[hidden] { display: none; }
.settings-title {
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-bright);
    margin-bottom: 14px;
}
.settings-group { margin-bottom: 16px; }
.settings-group:last-child { margin-bottom: 0; }
.settings-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-dim);
    margin-bottom: 8px;
}
.accent-row { display: flex; gap: 10px; }
.accent-swatch {
    width: 32px; height: 32px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    padding: 0;
    transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.accent-swatch:hover { transform: scale(1.12); }
.accent-swatch[aria-pressed="true"] {
    border-color: var(--text-bright);
    box-shadow: 0 0 0 3px rgb(var(--accent-rgb) / 0.25), 0 0 14px currentColor;
}
.accent-swatch[data-accent-value="blue"] { background: #6BA4D4; color: #6BA4D4; }
.accent-swatch[data-accent-value="violet"] { background: #a78bfa; color: #a78bfa; }
.accent-swatch[data-accent-value="cyan"] { background: #38bdf8; color: #38bdf8; }
.accent-swatch[data-accent-value="emerald"] { background: #4ade80; color: #4ade80; }
.segmented {
    display: flex;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 3px;
    gap: 3px;
}
.segmented button {
    flex: 1;
    padding: 7px 10px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-dim);
    font-family: inherit;
    font-size: 12.5px;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
}
.segmented button[aria-pressed="true"] {
    background: var(--primary-dark);
    color: #fff;
    box-shadow: 0 2px 10px rgb(var(--accent-rgb) / 0.3);
}
.segmented button:hover:not([aria-pressed="true"]) { color: var(--text); }
.lang-btn {
    height: 100%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 14px;
    border: none;
    background: transparent;
    color: var(--text-dim);
    cursor: pointer;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    transition: all var(--transition);
    letter-spacing: 0.5px;
}
.lang-btn.active {
    background: var(--primary-dark);
    color: #fff;
    box-shadow: 0 4px 15px rgb(var(--accent-rgb) / 0.3);
}
.lang-btn:hover:not(.active) {
    color: var(--text);
    background: rgba(255, 255, 255, 0.05);
}

/* ---- Section header (v3.0: left-aligned editorial style) ---- */
.section-header { text-align: start; margin-bottom: 36px; }
.section-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--primary);
    margin-bottom: 16px;
}
.section h2 {
    font-size: var(--text-h2);
    margin-bottom: 12px;
    letter-spacing: -0.5px;
    color: var(--text-bright);
}
.section-desc {
    color: var(--text-muted);
    font-size: var(--text-lead);
    max-width: 560px;
    line-height: 1.7;
}

/* ---- Scroll progress indicator ---- */
.scroll-progress {
    position: fixed;
    top: 0; inset-inline-start: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, var(--primary), var(--accent), var(--violet));
    z-index: 1500;
    transition: width 0.1s linear;
    box-shadow: 0 0 10px rgb(var(--accent-rgb) / 0.5);
}

/* ---- Back to top button ---- */
.back-to-top {
    position: fixed;
    bottom: 24px;
    inset-inline-end: 24px;
    z-index: 1000;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-glass);
    border: 1px solid var(--border-strong);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: var(--accent);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition);
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    background: var(--primary-dark);
    color: #fff;
    border-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgb(var(--accent-rgb) / 0.35);
}