/* ============================================
   🐍 پایتون‌باز آرکید — پایه
   ============================================ */

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-ui);
    background: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background var(--transition), color var(--transition);
}

/* پس‌زمینه نئونی */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -2;
    background:
        radial-gradient(ellipse 60% 40% at 15% -10%, var(--glow-yellow) 0%, transparent 60%),
        radial-gradient(ellipse 50% 40% at 85% 10%, var(--glow-purple) 0%, transparent 60%),
        radial-gradient(ellipse 40% 40% at 50% 110%, var(--glow-green) 0%, transparent 60%),
        var(--bg-deep);
    transition: background var(--transition);
}

/* اسکن‌لاین آرکید */
body::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(255, 255, 255, var(--scanline-opacity)) 3px,
        transparent 4px
    );
}

/* گرید پیکسلی محو */
.grid-overlay {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(255, 212, 59, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 212, 59, 0.03) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black, transparent 80%);
}

img,
svg,
canvas {
    display: block;
    max-width: 100%;
}

button {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    background: none;
    border: none;
    cursor: pointer;
}

input,
textarea,
select {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    background: var(--bg-inset);
    border: 1px solid rgba(255, 212, 59, 0.2);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus,
textarea:focus,
select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--glow-yellow);
}

a {
    color: var(--accent);
    text-decoration: none;
}

/* دسترسی‌پذیری */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ============================================
   لایوت عمومی
   ============================================ */

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--space-4);
    padding-bottom: 96px;
    animation: page-enter 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* انیمیشن ورود صفحه — محسوس و باحال */
@keyframes page-enter {
    from {
        opacity: 0;
        transform: translateY(28px) scale(0.97);
        filter: blur(4px);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
        filter: blur(0);
    }
}

/* هدر بالای صفحات */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    margin-bottom: var(--space-5);
    padding: var(--space-3) var(--space-4);
    background: var(--bg-panel);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 212, 59, 0.15);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.page-header h1,
.page-header h2 {
    font-size: 1.15rem;
    font-weight: 800;
}

.page-header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* ============================================
   نوار پایین (موبایل) — نسخه کامل ریسپانسیو
   ============================================ */

.bottom-nav {
    position: fixed;
    bottom: 0;
    inset-inline: 0;
    z-index: var(--z-nav);
    display: flex;
    justify-content: space-around;
    align-items: stretch;
    padding: var(--space-1) var(--space-2);
    padding-bottom: calc(var(--space-1) + env(safe-area-inset-bottom, 0px));
    background: rgba(16, 24, 44, 0.92);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-top: 1px solid rgba(255, 212, 59, 0.12);
    box-shadow: 0 -4px 30px rgba(0, 0, 0, 0.4);
    /* جلوگیری از لغزش در iOS */
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
}

.bottom-nav .nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    padding: var(--space-2) var(--space-1);
    border-radius: var(--radius);
    color: var(--text-muted);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    min-height: 52px;
    /* حداقل ارتفاع برای تاچ مناسب */
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    touch-action: manipulation;
}

.bottom-nav .nav-item::after {
    content: "";
    position: absolute;
    inset: 4px;
    border-radius: var(--radius);
    background: var(--accent);
    opacity: 0;
    transform: scale(0.6);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: -1;
}

.bottom-nav .nav-item:hover::after {
    opacity: 0.08;
    transform: scale(1);
}

.bottom-nav .nav-item::before {
    content: "";
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 24px;
    height: 3px;
    background: var(--accent);
    border-radius: 0 0 4px 4px;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.bottom-nav .nav-item:active {
    transform: scale(0.92);
}

.bottom-nav .nav-item.active {
    color: var(--accent);
}

.bottom-nav .nav-item.active::before {
    transform: translateX(-50%) scaleX(1);
}

.bottom-nav .nav-item.active .nav-icon {
    transform: translateY(-3px) scale(1.2);
    filter: drop-shadow(0 0 8px var(--glow-yellow));
}

.bottom-nav .nav-icon {
    font-size: 1.4rem;
    line-height: 1;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.bottom-nav .nav-label {
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

/* ============================================
   ریسپانسیو نوار پایین
   ============================================ */

/* موبایل کوچک */
@media (max-width: 360px) {
    .bottom-nav {
        padding: var(--space-1) var(--space-1);
    }

    .bottom-nav .nav-item {
        padding: 6px 2px;
        min-height: 48px;
    }

    .bottom-nav .nav-icon {
        font-size: 1.2rem;
    }

    .bottom-nav .nav-label {
        font-size: 0.6rem;
    }
}

/* موبایل معمولی */
@media (min-width: 361px) and (max-width: 480px) {
    .bottom-nav .nav-item {
        min-height: 54px;
    }

    .bottom-nav .nav-icon {
        font-size: 1.45rem;
    }

    .bottom-nav .nav-label {
        font-size: 0.68rem;
    }
}

/* تبلت */
@media (min-width: 481px) and (max-width: 768px) {
    .bottom-nav {
        max-width: 500px;
        margin: 0 auto;
        border-radius: var(--radius) var(--radius) 0 0;
        border-left: 1px solid rgba(255, 212, 59, 0.12);
        border-right: 1px solid rgba(255, 212, 59, 0.12);
    }

    .bottom-nav .nav-item {
        padding: var(--space-2) var(--space-3);
    }

    .bottom-nav .nav-icon {
        font-size: 1.5rem;
    }

    .bottom-nav .nav-label {
        font-size: 0.72rem;
    }
}

/* دسکتاپ — نوار پایین وسط‌چین و بزرگ‌تر */
@media (min-width: 769px) {
    .bottom-nav {
        max-width: 480px;
        margin: 0 auto;
        border-radius: var(--radius) var(--radius) 0 0;
        border-left: 1px solid rgba(255, 212, 59, 0.12);
        border-right: 1px solid rgba(255, 212, 59, 0.12);
        padding: var(--space-2) var(--space-4);
    }

    .bottom-nav .nav-item {
        padding: var(--space-3) var(--space-4);
        min-height: 56px;
    }

    .bottom-nav .nav-item::before {
        top: 0;
        left: 50%;
        transform: translateX(-50%) scaleX(0);
        width: 32px;
        height: 3px;
    }

    .bottom-nav .nav-item.active::before {
        transform: translateX(-50%) scaleX(1);
    }

    .bottom-nav .nav-icon {
        font-size: 1.5rem;
    }

    .bottom-nav .nav-label {
        font-size: 0.72rem;
    }
}

/* دکمه‌های شناور */
.fab {
    position: fixed;
    z-index: var(--z-nav);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    border-radius: var(--radius-full);
    background: var(--bg-panel);
    border: 1px solid rgba(255, 212, 59, 0.25);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.fab:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-neon);
}

.fab-top-start {
    top: var(--space-4);
    inset-inline-start: var(--space-4);
}

.fab-top-second {
    top: var(--space-4);
    inset-inline-start: 68px;
}

.fab-top-third {
    top: var(--space-4);
    inset-inline-start: 116px;
}

.fab-top-end {
    top: var(--space-4);
    inset-inline-end: var(--space-4);
}

/* ============================================
   اعداد و متن
   ============================================ */

.mono {
    font-family: var(--font-mono);
    direction: ltr;
    unicode-bidi: embed;
}

.text-muted {
    color: var(--text-muted);
}

.text-secondary {
    color: var(--text-secondary);
}

.text-accent {
    color: var(--accent);
}

.text-center {
    text-align: center;
}

.hidden {
    display: none !important;
}