:root {
            --bg: #0d0f14;
            --surface: #13161e;
            --border: #1f2433;
            --accent: #00e5ff;
            --accent2: #ff6b35;
            --text: #c8d0e0;
            --text-dim: #5a6478;
            --mono: 'Share Tech Mono', monospace;
            --sans: 'Barlow', sans-serif;
        }

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

        body {
            background: var(--bg);
            color: var(--text);
            font-family: var(--sans);
            font-weight: 300;
            min-height: 100vh;
            overflow-x: hidden;
        }

        /* Grid background */
        body::before {
            content: '';
            position: fixed;
            inset: 0;
            background-image:
                linear-gradient(rgba(0,229,255,0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(0,229,255,0.03) 1px, transparent 1px);
            background-size: 40px 40px;
            pointer-events: none;
            z-index: 0;
        }

        nav {
            position: relative;
            z-index: 10;
            display: flex;
            align-items: center;
            gap: 0;
            padding: 0 2rem;
            border-bottom: 1px solid var(--border);
            background: rgba(13,15,20,0.95);
            backdrop-filter: blur(10px);
        }

        nav .nav-brand {
            font-family: var(--mono);
            font-size: 0.75rem;
            color: var(--accent);
            letter-spacing: 0.2em;
            padding: 1.2rem 2rem 1.2rem 0;
            border-right: 1px solid var(--border);
            margin-right: 1.5rem;
            text-decoration: none;
        }

        nav a:not(.nav-brand) {
            font-family: var(--mono);
            font-size: 0.7rem;
            color: var(--text-dim);
            text-decoration: none;
            padding: 1.2rem 1.2rem;
            letter-spacing: 0.1em;
            transition: color 0.2s, background 0.2s;
            border-right: 1px solid var(--border);
        }

        nav a:not(.nav-brand):hover {
            color: var(--accent);
            background: rgba(0,229,255,0.04);
        }

        /* Hero */
        .hero {
            position: relative;
            z-index: 1;
            padding: 5rem 2rem 3rem;
            max-width: 900px;
            margin: 0 auto;
        }

        .hero-label {
            font-family: var(--mono);
            font-size: 0.65rem;
            color: var(--accent);
            letter-spacing: 0.3em;
            text-transform: uppercase;
            margin-bottom: 1.2rem;
            opacity: 0;
            animation: fadeUp 0.6s 0.1s forwards;
        }

        .hero h1 {
            font-family: var(--mono);
            font-size: clamp(2.5rem, 6vw, 4.5rem);
            font-weight: 400;
            color: #fff;
            letter-spacing: -0.02em;
            line-height: 1;
            margin-bottom: 1rem;
            opacity: 0;
            animation: fadeUp 0.6s 0.2s forwards;
        }

        .hero h1 span {
            color: var(--accent);
        }

        .hero-sub {
            font-size: 1rem;
            color: var(--text-dim);
            max-width: 500px;
            line-height: 1.6;
            opacity: 0;
            animation: fadeUp 0.6s 0.3s forwards;
        }

        /* Divider */
        .divider {
            position: relative;
            z-index: 1;
            max-width: 900px;
            margin: 0 auto;
            padding: 0 2rem;
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-bottom: 2.5rem;
        }

        .divider-line {
            flex: 1;
            height: 1px;
            background: var(--border);
        }

        .divider-label {
            font-family: var(--mono);
            font-size: 0.6rem;
            color: var(--text-dim);
            letter-spacing: 0.25em;
        }

        /* Cards */
        .cards {
            position: relative;
            z-index: 1;
            max-width: 900px;
            margin: 0 auto;
            padding: 0 2rem;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1px;
            background: var(--border);
            border: 1px solid var(--border);
            opacity: 0;
            animation: fadeUp 0.6s 0.4s forwards;
        }

        .card {
            background: var(--surface);
            padding: 2rem;
            transition: background 0.2s;
            text-decoration: none;
            color: inherit;
            display: block;
        }

        .card:hover {
            background: #161924;
        }

        .card-num {
            font-family: var(--mono);
            font-size: 0.6rem;
            color: var(--accent);
            letter-spacing: 0.2em;
            margin-bottom: 1rem;
        }

        .card h2 {
            font-family: var(--mono);
            font-size: 0.95rem;
            font-weight: 400;
            color: #fff;
            letter-spacing: 0.05em;
            margin-bottom: 0.8rem;
        }

        .card p {
            font-size: 0.85rem;
            color: var(--text-dim);
            line-height: 1.6;
            margin-bottom: 1.2rem;
        }

        .card-arrow {
            font-family: var(--mono);
            font-size: 0.7rem;
            color: var(--accent2);
            letter-spacing: 0.1em;
            transition: letter-spacing 0.2s;
        }

        .card:hover .card-arrow {
            letter-spacing: 0.25em;
        }

        /* Instructions */
        .instructions {
            position: relative;
            z-index: 1;
            max-width: 900px;
            margin: 3rem auto 0;
            padding: 0 2rem 4rem;
            opacity: 0;
            animation: fadeUp 0.6s 0.55s forwards;
        }

        .instructions-header {
            font-family: var(--mono);
            font-size: 0.65rem;
            color: var(--text-dim);
            letter-spacing: 0.3em;
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .instructions-header::after {
            content: '';
            flex: 1;
            height: 1px;
            background: var(--border);
        }

        .instruction-block {
            border: 1px solid var(--border);
            margin-bottom: 1px;
            overflow: hidden;
        }

        .instruction-title {
            font-family: var(--mono);
            font-size: 0.75rem;
            color: var(--accent);
            letter-spacing: 0.1em;
            padding: 1rem 1.5rem;
            background: rgba(0,229,255,0.03);
            border-bottom: 1px solid var(--border);
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }

        .instruction-title .tag {
            background: var(--accent);
            color: var(--bg);
            font-size: 0.55rem;
            padding: 0.15rem 0.5rem;
            letter-spacing: 0.15em;
        }

        .instruction-body {
            padding: 1.2rem 1.5rem;
        }

        .step {
            display: flex;
            gap: 1.2rem;
            margin-bottom: 0.9rem;
            align-items: flex-start;
        }

        .step:last-child { margin-bottom: 0; }

        .step-num {
            font-family: var(--mono);
            font-size: 0.6rem;
            color: var(--accent2);
            min-width: 1.5rem;
            padding-top: 0.15rem;
            letter-spacing: 0.1em;
        }

        .step-text {
            font-size: 0.85rem;
            color: var(--text);
            line-height: 1.6;
        }

        .step-text code {
            font-family: var(--mono);
            font-size: 0.8rem;
            color: var(--accent);
            background: rgba(0,229,255,0.06);
            padding: 0.1rem 0.4rem;
        }

        .note {
            font-family: var(--mono);
            font-size: 0.7rem;
            color: var(--text-dim);
            border-left: 2px solid var(--accent2);
            padding: 0.6rem 1rem;
            margin-top: 1rem;
            background: rgba(255,107,53,0.04);
        }

        @keyframes fadeUp {
            from { opacity: 0; transform: translateY(16px); }
            to   { opacity: 1; transform: translateY(0); }
        }

        @media (max-width: 600px) {
            .cards { grid-template-columns: 1fr; }
        }



.form-block,
.result-block {
    margin-top: 1.5rem;
}

.tool-form {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-family: var(--mono);
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    color: var(--accent);
    text-transform: uppercase;
}

.form-group input,
.form-group textarea {
    width: 100%;
    background: #0f131b;
    border: 1px solid var(--border);
    color: var(--text);
    font-family: var(--mono);
    font-size: 0.9rem;
    padding: 0.95rem 1rem;
    outline: none;
    transition: border-color 0.2s, background 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
    background: #111722;
}

.form-group textarea {
    min-height: 180px;
    resize: vertical;
    line-height: 1.6;
}

.submit-btn {
    align-self: flex-start;
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
    font-family: var(--mono);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    padding: 0.9rem 1.4rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.submit-btn:hover {
    background: rgba(0,229,255,0.08);
    color: #fff;
}

.result-output h3 {
    font-family: var(--mono);
    font-size: 0.85rem;
    color: #fff;
    margin-bottom: 1rem;
    letter-spacing: 0.08em;
}

.result-lines {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.result-line {
    background: rgba(0,229,255,0.04);
    border: 1px solid var(--border);
    padding: 0.8rem 1rem;
    font-family: var(--mono);
    font-size: 0.82rem;
    color: var(--text);
    word-break: break-word;
}

.flashes {
    list-style: none;
    margin-top: 1rem;
    padding: 0;
}

.flash {
    padding: 0.85rem 1rem;
    border: 1px solid var(--border);
    font-family: var(--mono);
    font-size: 0.78rem;
    margin-bottom: 0.7rem;
}

.flash.error {
    border-left: 3px solid #ff6b35;
    background: rgba(255,107,53,0.06);
    color: #ffb08f;
}

.flash.success {
    border-left: 3px solid var(--accent);
    background: rgba(0,229,255,0.06);
    color: var(--text);
}

@media (max-width: 600px) {
    .instructions {
        padding: 0 1rem 3rem;
    }

    nav {
        flex-wrap: wrap;
        padding: 0 1rem;
    }

    nav .nav-brand,
    nav a:not(.nav-brand) {
        border-right: none;
        margin-right: 0;
        padding-left: 0;
    }

    .submit-btn {
        width: 100%;
    }
}


.map-frame-wrap {
    border: 1px solid var(--border);
    background: #0f131b;
    overflow: hidden;
}

.map-frame {
    width: 100%;
    height: 520px;
    border: 0;
    display: block;
    background: #111722;
}

.map-actions {
    margin-top: 1.2rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.export-btn {
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

input[type="file"] {
    width: 100%;
    background: #0f131b;
    border: 1px solid var(--border);
    color: var(--text);
    font-family: var(--mono);
    font-size: 0.85rem;
    padding: 0.85rem 1rem;
    cursor: pointer;
}

input[type="file"]::file-selector-button {
    background: rgba(0,229,255,0.08);
    border: 1px solid var(--accent);
    color: var(--accent);
    font-family: var(--mono);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    padding: 0.55rem 0.9rem;
    margin-right: 1rem;
    cursor: pointer;
}

input[type="file"]:hover::file-selector-button {
    background: rgba(0,229,255,0.14);
    color: #fff;
}

@media (max-width: 600px) {
    .map-frame {
        height: 380px;
    }

    .map-actions {
        flex-direction: column;
    }

    .export-btn,
    .submit-btn {
        width: 100%;
    }
}

.form-group select {
    width: 100%;
    background: #0f131b;
    border: 1px solid var(--border);
    color: var(--text);
    font-family: var(--mono);
    font-size: 0.9rem;
    padding: 0.95rem 1rem;
    outline: none;
    transition: border-color 0.2s, background 0.2s;
}

.form-group select:focus {
    border-color: var(--accent);
    background: #111722;
}

nav a.active {
color: var(--accent);
background: rgba(0,229,255,0.04);
}