:root {
            --cyan: #00bbe5;
            --cyan-dim: #007eb8;
            --cyan-glow: rgba(0, 187, 229, 0.15);
            --cyan-trace: rgba(0, 187, 229, 0.06);
            --dark: #050a12;
            --dark-2: #080f1a;
            --dark-3: #0c1622;
            --dark-4: #111e2e;
            --dark-5: #162437;
            --border: rgba(0, 187, 229, 0.12);
            --border-dim: rgba(255, 255, 255, 0.06);
            --text: #e2eaf4;
            --text-dim: #7a92a8;
            --text-faint: #3d5468;
            --red: #ff3d57;
            --amber: #ffb443;
            --white: #ffffff;
            --font-head: 'Barlow Condensed', sans-serif;
            --font-body: 'DM Sans', sans-serif;
            --font-mono: 'JetBrains Mono', monospace;
        }

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

        body {
            background: var(--dark);
            color: var(--text);
            font-family: var(--font-body);
            font-size: 16px;
            line-height: 1.6;
            overflow-x: hidden;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        .grid-overlay {
            position: fixed;
            inset: 0;
            pointer-events: none;
            z-index: 0;
            background-image:
                linear-gradient(var(--border-dim) 1px, transparent 1px),
                linear-gradient(90deg, var(--border-dim) 1px, transparent 1px);
            background-size: 60px 60px;
            mask-image: radial-gradient(ellipse 80% 80% at 50% 20%, black 30%, transparent 100%);
            -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 20%, #000 30%, transparent 100%);
        }

        nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 5%;
            height: 72px;
            border-bottom: 1px solid var(--border-dim);
            background: rgba(5, 10, 18, 0.88);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-head);
            font-weight: 800;
            font-size: 22px;
            letter-spacing: 0.04em;
            text-decoration: none;
            color: var(--white);
        }

        .nav-logo .sentinel {
            color: var(--cyan);
        }

        .logo-icon {
            width: 34px;
            height: 34px;
            display: flex;
            align-items: center;
            justify-content: center;
            background-image: url('./logo.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }

        .login-wrapper {
            position: relative;
            z-index: 1;
            flex: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 100px 5% 40px;
        }

        .login-card {
            background: var(--dark-3);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 48px;
            width: 100%;
            max-width: 440px;
            position: relative;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
            animation: fadeUp 0.6s ease both;
        }

        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(24px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .login-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, transparent, var(--cyan), transparent);
        }

        .login-header {
            text-align: center;
            margin-bottom: 32px;
        }

        .login-title {
            font-family: var(--font-head);
            font-size: 32px;
            font-weight: 800;
            text-transform: uppercase;
            color: var(--white);
            letter-spacing: 0.04em;
            margin-bottom: 8px;
        }
        
        .login-title span {
            color: var(--cyan);
        }

        .login-subtitle {
            font-family: var(--font-mono);
            font-size: 12px;
            color: var(--text-dim);
            letter-spacing: 0.04em;
        }

        .input-group {
            margin-bottom: 24px;
        }

        .input-group label {
            display: block;
            font-family: var(--font-mono);
            font-size: 11px;
            letter-spacing: 0.1em;
            text-transform: uppercase;
            color: var(--text-dim);
            margin-bottom: 8px;
        }

        .entry-input {
            width: 100%;
            background: var(--dark-2);
            border: 1px solid var(--border-dim);
            border-radius: 4px;
            padding: 14px 16px;
            color: var(--text);
            font-family: var(--font-body);
            font-size: 15px;
            transition: all 0.2s;
            outline: none;
        }

        .entry-input:focus {
            border-color: var(--cyan);
            background: var(--dark-4);
            box-shadow: 0 0 0 3px var(--cyan-glow);
        }

        .entry-input::placeholder {
            color: var(--text-faint);
        }

        .btn {
            font-family: var(--font-head);
            font-weight: 700;
            font-size: 16px;
            letter-spacing: 0.1em;
            text-transform: uppercase;
            text-decoration: none;
            padding: 14px;
            cursor: pointer;
            border: none;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s;
            position: relative;
            overflow: hidden;
            width: 100%;
            border-radius: 4px;
        }

        .btn-primary {
            background: var(--cyan);
            color: var(--dark);
            margin-top: 32px;
        }

        .btn-primary::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.15), transparent);
            opacity: 0;
            transition: opacity 0.2s;
        }

        .btn-primary:hover {
            background: #00ffea;
            box-shadow: 0 0 28px rgba(0, 187, 229, 0.4);
        }

        .btn-primary:hover::before {
            opacity: 1;
        }

        footer {
            position: relative;
            z-index: 1;
            text-align: center;
            padding: 24px;
            font-family: var(--font-mono);
            font-size: 11px;
            color: var(--text-faint);
            letter-spacing: 0.04em;
        }