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

:root {
    --primary: #8b5cf6; /* Vibrant Purple */
    --primary-dark: #6d28d9; /* Deep Purple */
    --secondary: #3b82f6; /* Bright Blue */
    --success: #34c759;
    --danger: #ff3b30;
    
    /* Permanent Dark Theme */
    --bg: #0f172a; 
    --card: rgba(30, 41, 59, 0.7);
    --card-blur: rgba(15, 23, 42, 0.4);
    --text: #f8fafc;
    --text-light: #94a3b8;
    --border: rgba(255, 255, 255, 0.1);
    --input-bg: rgba(30, 41, 59, 0.8);
    --nav-bg: rgba(15, 23, 42, 0.6);
    
    /* Purple-Blue Background Glow */
    --glass-grad-1: rgba(139, 92, 246, 0.15); 
    --glass-grad-2: rgba(59, 130, 246, 0.1);
    
    --glass-blur: 24px;
    --radius: 16px; 
    --transition: 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", system-ui, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
    transition: background-color var(--transition), color var(--transition);
}

.glass-background {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: radial-gradient(circle at 10% 10%, var(--glass-grad-1) 0%, transparent 40%),
                radial-gradient(circle at 90% 90%, var(--glass-grad-2) 0%, transparent 40%);
    pointer-events: none;
    z-index: -1;
}

.hidden { display: none !important; }

/* NAV & HEADER */
.top-nav, .app-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 16px 40px;
    background: var(--nav-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 100;
    transition: background var(--transition), border-color var(--transition);
}

.nav-logo { 
    font-size: 20px; 
    font-weight: 700; 
    letter-spacing: 1px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.app-title { font-weight: 600; color: var(--text-light); }
.nav-link { background: none; border: none; color: var(--text-light); cursor: pointer; font-weight: 500; font-size: 15px;}
.nav-link:hover { color: var(--primary); }

/* HERO */
.hero { padding: 80px 20px; text-align: center; max-width: 900px; margin: 0 auto; }
.hero-title { font-size: 56px; font-weight: 700; margin-bottom: 16px; line-height: 1.1; letter-spacing: -1px; }
.hero-subtitle { font-size: 20px; color: var(--text-light); margin-bottom: 40px; }

/* GLASS CARDS */
.glass-card, .card {
    background: var(--card);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.04);
    transition: background var(--transition), border-color var(--transition);
}

.home-tracking-widget { max-width: 600px; margin: 0 auto 60px; padding: 24px; }
.home-tracking-widget h3 { margin-bottom: 16px; font-size: 18px; color: var(--text-light); }

/* FEATURES */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; max-width: 1000px; margin: 0 auto; padding: 0 20px 100px; }
.feature-icon { font-size: 32px; margin-bottom: 16px; }
.feature-card h3 { font-size: 20px; margin-bottom: 8px; }
.feature-card p { color: var(--text-light); font-size: 15px; }

/* BUTTONS */
button { font-family: inherit; border: none; border-radius: 12px; cursor: pointer; transition: var(--transition); font-weight: 600; font-size: 15px; }
.btn-primary { 
    background: linear-gradient(135deg, var(--primary), var(--secondary)); 
    color: white; 
    padding: 12px 24px; 
    border: none;
}
.btn-primary:hover { 
    transform: scale(1.02); 
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
}
.btn-secondary { background: rgba(120,120,120,0.15); color: var(--text); padding: 12px 24px; }
.btn-secondary:hover { background: rgba(120,120,120,0.25); }
.btn-danger { background: rgba(255, 59, 48, 0.1); color: var(--danger); padding: 8px 16px; }
.btn-back { background: transparent; color: var(--primary); font-size: 16px; padding: 0; }
.btn-back:hover { opacity: 0.7; }
.btn-sm { padding: 8px 16px; font-size: 14px; }

/* APP LAYOUT */
.container { max-width: 800px; margin: 0 auto; padding: 40px 20px; }
.card-header { margin-bottom: 24px; border-bottom: 1px solid var(--border); padding-bottom: 16px; }
.card-header h3 { font-size: 24px; font-weight: 600; }
.subtitle { color: var(--text-light); font-size: 15px; margin-top: 4px; }

.user-info { display: flex; justify-content: space-between; align-items: center; padding: 16px 24px; background: var(--input-bg); border-radius: 12px; margin-bottom: 24px; font-weight: 500; border: 1px solid var(--border); }
.nav-menu { display: flex; gap: 8px; margin-bottom: 24px; flex-wrap: wrap; background: rgba(120,120,120,0.1); padding: 4px; border-radius: 14px; }
.nav-btn { flex: 1; background: transparent; color: var(--text-light); padding: 10px; border-radius: 10px; }
.nav-btn.active { background: var(--input-bg); color: var(--text); box-shadow: 0 2px 8px rgba(0,0,0,0.04); }
.btn-admin { color: var(--danger); }

/* FORMS */
.field { margin-bottom: 20px; }
.field label { display: block; margin-bottom: 8px; color: var(--text-light); font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; }
input, select { width: 100%; padding: 14px 16px; border: 1px solid var(--border); border-radius: 12px; font-size: 15px; font-family: inherit; background: var(--input-bg); color: var(--text); transition: var(--transition); }
input:focus, select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px rgba(197, 160, 89, 0.15); }
.auth-actions { display: flex; gap: 12px; flex-direction: column; }
.tracking-input-group { display: flex; gap: 8px; }
.tracking-input-group input { flex: 1; }

/* TABLES & RESULTS */
.table-container { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; text-align: left; }
th { padding: 12px 16px; font-size: 13px; color: var(--text-light); border-bottom: 1px solid var(--border); font-weight: 600; text-transform: uppercase; }
td { padding: 16px; font-size: 14px; border-bottom: 1px solid rgba(120,120,120,0.1); }
.status-badge { display: inline-block; padding: 4px 12px; border-radius: 20px; font-size: 12px; font-weight: 600; background: rgba(120,120,120,0.1); text-transform: uppercase; }

.track-result-card { margin-top: 20px; padding: 24px; background: var(--input-bg); border-radius: 12px; border: 1px solid var(--border); }
.result-row { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--border); }
.result-row:last-child { border: none; padding-bottom: 0; }
.result-label { color: var(--text-light); font-size: 14px; }
.result-value { font-weight: 600; }

.result-message { margin-top: 16px; padding: 12px; border-radius: 8px; font-weight: 500; font-size: 14px; display: none; }
.result-message.success { background: rgba(52, 199, 89, 0.1); color: var(--success); display: block; }
.result-message.error { background: rgba(255, 59, 48, 0.1); color: var(--danger); display: block; }