/* ============================================================
   theme-min.css — Theme Tối Quân sự HUD (Digital Tactical HUD)
   Hỗ trợ biến --primary-color (RULE.md mục 3) được gán từ settings
   qua thẻ <style>:root{--primary-color:<?php echo $mau_chu_dao; ?>}
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700;900&family=Orbitron:wght@500;700&display=swap');

:root {
    --primary-color: #4ade80;   /* mặc định — sẽ bị ghi đè bởi settings */
    --army-dark: #1a202c;
    --army-green: #2F4F4F;
    --army-accent: var(--primary-color);
    --army-gold: #fbbf24;
    --panel-bg: rgba(30, 41, 59, 0.85);
    --text-primary: #e2e8f0;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: #0f172a;
    background-image:
        radial-gradient(circle at 10% 20%, rgba(47, 79, 79, 0.4) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(206, 17, 38, 0.1) 0%, transparent 20%);
    color: var(--text-primary);
    overflow-x: hidden;
}

/* Font kỹ thuật số cho tiêu đề */
.font-tech { font-family: 'Orbitron', sans-serif; letter-spacing: 1px; }

/* Scrollbar tùy chỉnh */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #0f172a; }
::-webkit-scrollbar-thumb { background: #475569; border-radius: 3px; }

/* Hiệu ứng kính mờ (Glassmorphism) */
.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

/* Nút bấm kiểu HUD */
.btn-hud {
    background: linear-gradient(180deg, rgba(55, 65, 81, 0.8) 0%, rgba(31, 41, 55, 0.9) 100%);
    border: 1px solid rgba(74, 222, 128, 0.3);
    color: var(--primary-color);
    text-transform: uppercase;
    font-family: 'Orbitron', sans-serif;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}
.btn-hud:hover {
    background: color-mix(in srgb, var(--primary-color) 10%, transparent);
    border-color: var(--primary-color);
    box-shadow: 0 0 15px color-mix(in srgb, var(--primary-color) 30%, transparent);
    text-shadow: 0 0 5px var(--primary-color);
}

/* Card bài giảng */
.card-tech {
    background: linear-gradient(145deg, #1e293b, #0f172a);
    border: 1px solid #334155;
    position: relative;
    transition: 0.3s;
}
.card-tech::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--army-gold), transparent);
    opacity: 0.5;
}
.card-tech:hover {
    transform: translateY(-5px);
    border-color: var(--army-gold);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
}
.card-tech:active { transform: scale(0.98); }

/* Animation quét radar */
@keyframes scanline {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(100%); }
}
.scan-effect { position: absolute; inset: 0; pointer-events: none; overflow: hidden; opacity: 0.1; }
.scan-effect::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent, var(--primary-color), transparent);
    height: 50%;
    animation: scanline 4s linear infinite;
}

/* Viewer Container */
.viewer-container { background: #000; height: 100vh; display: flex; flex-direction: column; }