:root {
    --bg-deep: #020817;
    --bg-mid: #0f172a;
    --bg-soft: #111827;
    --panel: rgba(15, 23, 42, 0.82);
    --panel-strong: rgba(15, 23, 42, 0.92);
    --panel-soft: rgba(17, 24, 39, 0.7);
    --border: rgba(96, 165, 250, 0.22);
    --border-soft: rgba(148, 163, 184, 0.22);
    --text: #f8fafc;
    --text-soft: #dbeafe;
    --text-muted: #cbd5e1;
    --accent: #f97316;
    --accent-strong: #fb7185;
    --accent-alt: #22d3ee;
    --glow: rgba(249, 115, 22, 0.28);
    --shadow: rgba(2, 8, 23, 0.52);
}

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    font-family: Arial, Helvetica, sans-serif;
    background: linear-gradient(135deg, var(--bg-deep), var(--bg-mid) 48%, var(--bg-soft));
    color: var(--text-soft);
}

.page-shell {
    width: min(90vw, 520px);
    padding: 32px 28px;
    background: var(--panel);
    border: 1px solid var(--border-soft);
    border-radius: 20px;
    box-shadow: 0 20px 45px var(--shadow);
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 24px;
}

.brand {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.nav-links a:hover {
    color: var(--text);
}

h1,
h2 {
    margin: 0 0 16px;
    color: var(--text);
}

h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    line-height: 1.1;
}

h2 {
    font-size: 1.4rem;
    color: var(--text-muted);
}

form {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 16px;
}

label {
    font-weight: 600;
    color: var(--text-muted);
}

input {
    width: 100%;
    padding: 12px 14px;
    border-radius: 10px;
    border: 1px solid rgba(148, 163, 184, 0.3);
    background: var(--panel-strong);
    color: var(--text);
    outline: none;
    box-sizing: border-box;
}

input:focus {
    border-color: var(--accent-alt);
    box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.18);
}

button,
.primary-button,
.secondary-button {
    appearance: none;
    border: none;
    border-radius: 10px;
    padding: 12px 18px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, background 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 0.95rem;
}

button,
.primary-button {
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    color: white;
    box-shadow: 0 10px 24px var(--glow);
}

button:hover,
.primary-button:hover {
    transform: translateY(-1px);
}

.secondary-button {
    background: rgba(148, 163, 184, 0.12);
    border: 1px solid var(--border-soft);
    color: var(--text);
    box-shadow: none;
}

.secondary-button:hover {
    transform: translateY(-1px);
    border-color: rgba(96, 165, 250, 0.35);
}

.error-shell {
    width: min(90vw, 620px);
}

.error-card {
    display: grid;
    gap: 18px;
    padding: 28px 28px 30px;
}

.error-code {
    font-size: clamp(5rem, 15vw, 8rem);
    line-height: 0.9;
    font-weight: 800;
    letter-spacing: -0.08em;
    color: var(--accent-alt);
    margin-top: 6px;
}

.error-copy {
    display: grid;
    gap: 10px;
}

.error-copy h1 {
    margin: 0;
    font-size: clamp(2rem, 6vw, 3rem);
}

.error-copy p {
    margin: 0;
    color: var(--text-muted);
    line-height: 1.6;
    font-size: 1rem;
}

.error-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 8px;
}

.guestbook-shell {
    width: min(90vw, 640px);
}

.guestbook-panel {
    display: grid;
    gap: 18px;
}

.guestbook-list {
    list-style: none;
    display: grid;
    gap: 12px;
    margin: 0;
    padding: 0;
}

.guestbook-list li {
    background: var(--panel-soft);
    border: 1px solid var(--border-soft);
    border-radius: 12px;
    padding: 12px 14px;
    color: var(--text-soft);
    line-height: 1.5;
    word-break: break-word;
}

.guestbook-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: min(100%, 360px);
    margin: 0 auto;
    align-items: stretch;
}

.guestbook-form label {
    display: block;
    width: 100%;
}

.guestbook-form input,
.guestbook-form textarea {
    display: block;
    width: 100%;
    max-width: 100%;
    padding: 8px 10px;
    border-radius: 8px;
    border: 1px solid rgba(148, 163, 184, 0.32);
    background: var(--panel-strong);
    color: var(--text);
    box-sizing: border-box;
    font: inherit;
    margin: 0 auto;
}

.guestbook-form textarea {
    min-height: 80px;
    max-height: 140px;
    resize: vertical;
}

.guestbook-form input:focus,
.guestbook-form textarea:focus {
    border-color: var(--accent-alt);
    box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.18);
    outline: none;
}

.guestbook-form button {
    display: block;
    width: fit-content;
    min-width: 90px;
    padding: 10px 16px;
    margin: 4px auto 0;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    color: white;
    font-weight: 700;
    box-shadow: 0 10px 24px var(--glow);
}

#picture {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 16px auto;
    border-radius: 12px;
}

#nasa-link {
    color: var(--accent-alt);
    text-decoration: none;
    font-weight: 600;
}

#nasa-link:hover {
    text-decoration: underline;
}

#login-message {
    min-height: 24px;
    margin: 14px 0 0;
    color: var(--text-soft);
}

#logout-button {
    margin-top: 14px;
}

.eyebrow {
    display: inline-block;
    margin-bottom: 12px;
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    font-weight: 700;
    color: var(--accent-alt);
}

.app-card {
    background: var(--panel-soft);
    border: 1px solid var(--border-soft);
    border-radius: 18px;
    padding: 24px;
}

.dashboard-layout {
    display: grid;
    gap: 22px;
}

.dashboard-header {
    display: grid;
    gap: 8px;
}

.dashboard-header p {
    margin: 0;
    color: var(--text-muted);
    line-height: 1.6;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.stat-card {
    display: grid;
    gap: 10px;
    padding: 18px 16px;
    border-radius: 14px;
    background: var(--panel-strong);
    border: 1px solid var(--border-soft);
}

.stat-label {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent-alt);
}

.stat-card strong {
    font-size: 1.08rem;
    color: var(--text);
}

.secondary-button {
    align-self: flex-start;
    background: rgba(148, 163, 184, 0.12);
    border: 1px solid var(--border-soft);
    color: var(--text);
    box-shadow: none;
}

.projects-shell {
    width: min(90vw, 760px);
}

.projects-panel {
    display: grid;
    gap: 22px;
}

.projects-header {
    display: grid;
    gap: 8px;
}

.projects-header p {
    margin: 0;
    color: var(--text-muted);
    line-height: 1.6;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.project-card {
    background: var(--panel-soft);
    border: 1px solid var(--border-soft);
    border-radius: 16px;
    padding: 20px 18px;
    display: grid;
    gap: 12px;
}

.project-tag {
    display: inline-block;
    width: fit-content;
    padding: 6px 10px;
    border-radius: 999px;
    background: rgba(249, 115, 22, 0.12);
    color: #fed7aa;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-weight: 700;
}

.project-card h2 {
    margin: 0;
    font-size: 1.2rem;
}

.project-card p {
    margin: 0;
    color: var(--text-muted);
    line-height: 1.6;
}

#status {
    margin-bottom: 18px;
}

#login-section {
    margin-top: 12px;
}

@media (max-width: 520px) {
    .page-shell {
        width: min(92vw, 420px);
        padding: 24px 20px;
    }

    .topbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .guestbook-form {
        flex-direction: column;
    }

    .dashboard-grid,
    .project-grid {
        grid-template-columns: 1fr;
    }
}