/* ==========================================================================
   TKD CLUB PRO - TAEKWONDO MARTIAL ARTS THEME (CSS VARIABLES & STYLES)
   Colors: Hong Red (#C8102E), Chong Blue (#0033A0), Jet Black (#111827)
   ========================================================================== */

:root {
    /* Taekwondo Brand Palette */
    --tkd-hong: #C8102E;       /* Đỏ Võ Đạo / Giáp Hong WT */
    --tkd-hong-hover: #A00C24;
    --tkd-chong: #0033A0;      /* Xanh Dương / Giáp Chong WT */
    --tkd-chong-hover: #002575;
    --tkd-black: #111827;      /* Đen Tuyển Huyền Đai */
    --tkd-gold: #F59E0B;       /* Vàng Huy Chương */

    /* Light Theme (Default) */
    --bg-main: #F8FAFC;
    --bg-card: #FFFFFF;
    --bg-elevated: #F1F5F9;
    --text-main: #0F172A;
    --text-muted: #64748B;
    --border-color: #E2E8F0;
    --shadow-soft: 0 4px 20px -2px rgba(0, 0, 0, 0.06);
    --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.07);
}

[data-theme="dark"] {
    /* Dark Theme */
    --bg-main: #0B0F19;
    --bg-card: #151C2C;
    --bg-elevated: #1E293B;
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --border-color: #334155;
    --shadow-soft: 0 4px 20px -2px rgba(0, 0, 0, 0.4);
    --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Belt Visual Badge & Borders */
.belt-badge-white { background: #F1F5F9; color: #334155; border: 2px solid #CBD5E1; }
.belt-badge-yellow { background: #FEF08A; color: #854D0E; border: 2px solid #EAB308; }
.belt-badge-green { background: #BBF7D0; color: #166534; border: 2px solid #22C55E; }
.belt-badge-blue { background: #BFDBFE; color: #1E40AF; border: 2px solid #3B82F6; }
.belt-badge-red { background: #FECACA; color: #991B1B; border: 2px solid #DC2626; }
.belt-badge-black { background: #111827; color: #F8FAFC; border: 2px solid #F59E0B; }

/* Student Electronic VIP Card */
.vip-card-wrap {
    position: relative;
    background: linear-gradient(135deg, #111827 0%, #1E293B 100%);
    border-radius: 28px;
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

.vip-card-wrap::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(200, 16, 46, 0.25) 0%, transparent 70%);
    pointer-events: none;
}

.vip-card-wrap::after {
    content: '';
    position: absolute;
    bottom: -40%;
    left: -20%;
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, rgba(0, 51, 160, 0.25) 0%, transparent 70%);
    pointer-events: none;
}

/* Tactile Big Thumb Touch Buttons for Field Attendance */
.tactile-btn {
    transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}
.tactile-btn:active {
    transform: scale(0.94);
}

/* Animations */
@keyframes pulseGlow {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.03); }
}

.glow-active {
    animation: pulseGlow 2s infinite ease-in-out;
}