@import url("https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;700&family=IBM+Plex+Mono:wght@400;500&display=swap");

:root {
    --bg: #0e141b;
    --bg-soft: #16202c;
    --card: #111a23;
    --card-edge: rgba(137, 199, 255, 0.24);
    --text: #ecf3fb;
    --muted: #9db0c6;
    --accent: #59c2ff;
    --accent-2: #7af5bf;
    --danger: #ff6c82;
    --radius: 16px;
    --shadow: 0 18px 35px rgba(0, 0, 0, 0.35);
}

.landing-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 28px 16px;
}

.landing-hero {
    width: min(980px, 100%);
    border-radius: 26px;
    border: 1px solid rgba(122, 245, 191, 0.2);
    background:
        linear-gradient(120deg, rgba(14, 22, 30, 0.8), rgba(16, 28, 38, 0.86)),
        radial-gradient(circle at 20% 15%, rgba(89, 194, 255, 0.25), transparent 44%);
    box-shadow: 0 35px 70px rgba(0, 0, 0, 0.45);
    padding: clamp(24px, 5vw, 48px);
    overflow: hidden;
    position: relative;
    animation: fade-up 0.7s ease both;
}

.landing-hero::before {
    content: "";
    position: absolute;
    inset: auto -12% -38% auto;
    width: 380px;
    height: 380px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(122, 245, 191, 0.22), rgba(122, 245, 191, 0));
    pointer-events: none;
}

.landing-kicker {
    margin: 0 0 8px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent-2);
    font-size: 0.8rem;
}

.landing-hero h1 {
    margin: 0;
    font-size: clamp(2rem, 6vw, 3.5rem);
    line-height: 1.04;
}

.landing-subtitle {
    margin: 12px 0 0;
    color: var(--muted);
    max-width: 62ch;
}

.landing-grid {
    margin-top: 28px;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.feature-card {
    position: relative;
    text-decoration: none;
    color: var(--text);
    border-radius: 18px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    background: linear-gradient(150deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
    padding: 20px;
    transition: transform 0.26s ease, border-color 0.26s ease, box-shadow 0.26s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: rgba(89, 194, 255, 0.56);
    box-shadow: 0 14px 28px rgba(0, 0, 0, 0.35);
}

.feature-chip {
    display: inline-block;
    padding: 6px 10px;
    font-size: 0.74rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    border: 1px solid rgba(122, 245, 191, 0.36);
    border-radius: 999px;
    color: var(--accent-2);
}

.feature-card h2 {
    margin: 12px 0 8px;
    font-size: 1.45rem;
}

.feature-card p {
    margin: 0;
    color: var(--muted);
    line-height: 1.45;
}

.feature-cta {
    display: inline-block;
    margin-top: 16px;
    color: var(--accent);
    font-weight: 700;
}

.landing-note {
    margin-top: 16px;
    font-size: 0.9rem;
    color: var(--muted);
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    font-family: "Space Grotesk", sans-serif;
    background:
        radial-gradient(circle at 20% 20%, rgba(89, 194, 255, 0.16), transparent 38%),
        radial-gradient(circle at 80% 15%, rgba(122, 245, 191, 0.1), transparent 32%),
        linear-gradient(160deg, #0a1016 0%, #0e141b 45%, #0a1119 100%);
    color: var(--text);
}

.app-shell {
    max-width: 980px;
    margin: 0 auto;
    padding: 28px 18px 40px;
}

.top-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 30px;
    gap: 16px;
}

.brand {
    font-size: 1.05rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
}

.nav-links {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.nav-link {
    color: var(--text);
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 999px;
    padding: 8px 14px;
    transition: all 0.22s ease;
    background: rgba(255, 255, 255, 0.02);
}

.nav-link:hover,
.nav-link.active {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}

.hero {
    border: 1px solid rgba(137, 199, 255, 0.22);
    border-radius: var(--radius);
    background: linear-gradient(145deg, rgba(17, 26, 35, 0.88), rgba(20, 31, 42, 0.72));
    box-shadow: var(--shadow);
    padding: clamp(20px, 4vw, 40px);
    animation: fade-up 0.6s ease both;
}

.hero h1 {
    margin-top: 0;
    margin-bottom: 8px;
    font-size: clamp(1.8rem, 3.8vw, 2.5rem);
}

.hero p {
    margin: 0;
    color: var(--muted);
    max-width: 66ch;
}

.upload-card {
    margin-top: 22px;
    border: 1px dashed var(--card-edge);
    border-radius: var(--radius);
    background: rgba(10, 16, 22, 0.55);
    padding: 22px;
    transition: border-color 0.2s ease, transform 0.2s ease;
}

.upload-card.drag-over {
    border-color: var(--accent-2);
    transform: scale(1.01);
}

.drop-zone {
    text-align: center;
    padding: 28px 14px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.02);
    cursor: pointer;
    transition: background 0.2s ease;
}

.drop-zone:hover {
    background: rgba(255, 255, 255, 0.05);
}

.drop-zone strong {
    display: block;
    font-size: 1.1rem;
}

.drop-zone span {
    color: var(--muted);
}

input[type="file"] {
    display: none;
}

.preview {
    margin-top: 16px;
    padding: 14px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.03);
    display: none;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.9rem;
    word-break: break-word;
    overflow-wrap: break-word;
    max-width: 100%;
}

.preview.visible {
    display: block;
}

.actions {
    margin-top: 18px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

button {
    border: none;
    border-radius: 12px;
    padding: 11px 16px;
    font-size: 0.95rem;
    font-family: inherit;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.btn-primary {
    color: #04141b;
    background: linear-gradient(120deg, var(--accent), var(--accent-2));
    box-shadow: 0 8px 18px rgba(89, 194, 255, 0.26);
}

.btn-secondary {
    color: var(--text);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.16);
}

button:hover:not(:disabled) {
    transform: translateY(-1px);
}

.status-wrap {
    margin-top: 20px;
    min-height: 64px;
}

.status {
    padding: 12px 14px;
    border-radius: 12px;
    display: none;
}

.status.visible {
    display: block;
    animation: fade-up 0.25s ease both;
}

.status.error {
    background: rgba(255, 108, 130, 0.13);
    border: 1px solid rgba(255, 108, 130, 0.35);
    color: #ffd4dd;
}

.status.success {
    background: rgba(122, 245, 191, 0.11);
    border: 1px solid rgba(122, 245, 191, 0.34);
    color: #d7fff0;
}

.spinner {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: 3px solid rgba(255, 255, 255, 0.24);
    border-top-color: var(--accent);
    animation: spin 0.8s linear infinite;
    display: inline-block;
    vertical-align: middle;
    margin-right: 10px;
}

.progress-track {
    width: 100%;
    height: 8px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.1);
    overflow: hidden;
    margin-top: 10px;
    display: none;
}

.progress-track.visible {
    display: block;
}

.progress-fill {
    width: 35%;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    animation: loading 1.05s ease-in-out infinite;
}

.footer-note {
    margin-top: 18px;
    color: var(--muted);
    font-size: 0.88rem;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes loading {
    0% {
        transform: translateX(-130%);
    }
    100% {
        transform: translateX(320%);
    }
}

@keyframes fade-up {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Tablet breakpoint: 768px */
@media (max-width: 768px) {
    .app-shell {
        padding: 16px 12px 30px;
    }

    .top-nav {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        padding: 10px 12px;
    }

    .brand {
        font-size: 0.95rem;
    }

    .hero h1 {
        font-size: clamp(1.6rem, 4vw, 2.2rem);
    }

    .upload-card {
        padding: 16px;
    }
}

/* Mobile breakpoint: 600px */
@media (max-width: 600px) {
    .app-shell {
        padding: 12px 8px 24px;
    }

    .top-nav {
        position: relative;
        gap: 8px;
        padding: 8px 10px;
    }

    .nav-link {
        padding: 6px 10px;
        font-size: 0.9rem;
    }

    .hero {
        margin-top: 20px;
    }

    .hero h1 {
        font-size: clamp(1.4rem, 3.5vw, 1.9rem);
    }

    .hero p {
        font-size: clamp(0.9rem, 1.8vw, 1rem);
    }

    .upload-card {
        margin-top: 16px;
        padding: 14px;
        border-radius: 12px;
    }

    .drop-zone {
        padding: 20px 10px;
    }

    .drop-zone strong {
        font-size: 1rem;
    }

    .drop-zone span {
        font-size: 0.85rem;
    }

    .actions {
        flex-direction: column;
        align-items: stretch;
        margin-top: 12px;
        gap: 8px;
    }

    button {
        width: 100%;
        min-height: 48px;
        padding: 12px;
        font-size: 0.9rem;
    }

    .preview {
        font-size: 0.85rem;
        padding: 12px;
    }

    .footer-note {
        font-size: 0.8rem;
        margin-top: 12px;
    }
}

/* Large desktop: 1200px+ */
@media (min-width: 1200px) {
    .app-shell {
        padding: 32px 0 48px;
    }

    .hero h1 {
        font-size: 3rem;
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    button:hover {
        transform: none;
    }

    button:active {
        transform: scale(0.98);
    }

    .nav-link:hover {
        background: rgba(255, 255, 255, 0.04);
    }
}

/* Respects motion preferences for accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}