/* وارد کردن فونت‌های مدرن برای اعداد و حروف فارسی/انگلیسی */
/* @import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&family=Vazirmatn:wght@400;600;700&display=swap'); */

/* متغیرهای رنگی (برای مدیریت آسان‌تر تم) */
:root {
    --bg-main: #0f172a;
    --bg-surface: rgba(30, 41, 59, 0.65); /* حالت نیمه شفاف برای افکت شیشه‌ای */
    --border-color: rgba(71, 85, 105, 0.5);
    --border-hover: rgba(251, 191, 36, 0.5);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent-gold: #fbbf24;
    --accent-green: #34d399;
    --accent-red: #f87171;
    --glow-shadow: 0 0 20px rgba(251, 191, 36, 0.15);
}

/* Reset و فونت‌ها */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    /* font-family: 'Inter', 'Vazirmatn', Tahoma, sans-serif; */
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    /* یک بک‌گراند گرادیانت محو برای عمق دادن به پس‌زمینه */
    background-image: radial-gradient(circle at 50% 0%, #1e293b 0%, transparent 70%);
    background-attachment: fixed;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* هدر */
header {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 1.5rem 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    background: linear-gradient(to right, #fbbf24, #f59e0b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

header p {
    font-size: 1.1rem;
    color: var(--text-muted);
}

/* کنترل‌ها */
.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 2.5rem 0 1.5rem;
    padding: 1rem 1.5rem;
    background: var(--bg-surface);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.btn-primary {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(217, 119, 6, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(217, 119, 6, 0.5);
    filter: brightness(1.1);
}

.btn-primary:active {
    transform: translateY(1px);
}

.badge {
    background: rgba(71, 85, 105, 0.4);
    color: var(--text-main);
    padding: 0.5rem 1.2rem;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* کارت‌ها */
.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.card {
    background: var(--bg-surface);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    animation: fadeIn 0.5s ease-out forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.card:hover {
    transform: translateY(-6px);
    border-color: var(--border-hover);
    box-shadow: var(--glow-shadow), 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* خط نورانی بالای کارت (تزئینی) */
.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover::before {
    opacity: 1;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.2rem;
}

.card-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-main);
}

.card-symbol {
    background: rgba(251, 191, 36, 0.1);
    color: var(--accent-gold);
    padding: 0.3rem 0.8rem;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 1px;
}

.card-price {
    font-size: 2.4rem;
    font-weight: 700;
    margin: 0.5rem 0;
    color: var(--text-main);
    letter-spacing: -1px;
    font-family: 'Inter', sans-serif; /* اعداد با فونت اینتر زیباترند */
}

.card-change {
    font-size: 1.05rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0;
}

.positive { color: var(--accent-green); }
.negative { color: var(--accent-red); }

/* نشانگر فلش بالا و پایین */
.positive::before { content: '▲'; font-size: 0.8rem; }
.negative::before { content: '▼'; font-size: 0.8rem; }

.card-meta {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
    display: flex;
    justify-content: space-between;
}

/* لودینگ و ارور */
.loading, .error {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--bg-surface);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    margin: 2rem 0;
}

.spinner {
    border: 4px solid rgba(251, 191, 36, 0.1);
    border-top: 4px solid var(--accent-gold);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s cubic-bezier(0.6, 0.2, 0.4, 0.8) infinite;
    margin: 0 auto 1.5rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error {
    color: var(--accent-red);
    border-color: rgba(248, 113, 113, 0.3);
    background: rgba(248, 113, 113, 0.05);
}

/* فوتر */
footer {
    text-align: center;
    margin: 4rem 0 2rem;
    padding: 2rem;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

footer div {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    padding: 0.6rem 1.5rem;
    border-radius: 50px;
    background: rgba(251, 191, 36, 0.05);
    border: 1px solid rgba(251, 191, 36, 0.2);
    color: var(--accent-gold);
    transition: all 0.3s ease;
    cursor: pointer;
}

footer div:hover {
    background: rgba(251, 191, 36, 0.15);
    border-color: var(--accent-gold);
    transform: translateY(-2px);
}

footer p {
    font-size: 0.95rem;
}

footer a {
    color: #60a5fa;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s;
}

footer a:hover {
    color: #93c5fd;
}

/* ریسپانسیو */
@media (max-width: 768px) {
    header h1 { font-size: 2rem; }
    
    .controls {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .btn-primary {
        justify-content: center;
    }
    
    .cards-container {
        grid-template-columns: 1fr;
    }
}