:root {
    --primary:    #0043CE;
    --primary-d:  #002D9C;
    --primary-bg: #EEF4FF;
    --dark:       #161616;
    --text:       #525252;
    --muted:      #8D8D8D;
    --gray-20:    #E0E0E0;
    --gray-10:    #F4F4F4;
    --white:      #FFFFFF;
    --red:        #DA1E28;
    --red-bg:     #FFF1F1;
    --red-border: #FFB3B8;
    --green:      #198038;
    --green-bg:   #DEFBE6;
    --green-bdr:  #A7F0BA;
    --mono:       'IBM Plex Mono', 'Fira Code', 'Consolas', monospace;
}

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

body {
    font-family: 'IBM Plex Sans', 'Segoe UI', system-ui, sans-serif;
    color: var(--text);
    line-height: 1.65;
    background: var(--white);
    font-size: 1rem;
}

/* ── Header ─────────────────────────── */
header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-20);
    padding: 0 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

header nav {
    max-width: 860px;
    margin: 0 auto;
    height: 56px;
    display: flex;
    align-items: center;
}

.logo {
    color: var(--dark);
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: -0.01em;
    text-decoration: none;
    font-family: 'IBM Plex Sans', sans-serif;
}

.logo span {
    color: var(--primary);
}

/* ── Hero ────────────────────────────── */
.hero {
    background: var(--gray-10);
    border-bottom: 1px solid var(--gray-20);
    padding: 5rem 1.5rem 4.5rem;
}

.hero-inner {
    max-width: 860px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(2.75rem, 7vw, 4.5rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 0.75rem;
    line-height: 1.0;
    color: var(--dark);
}

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

.hero .tagline {
    font-size: clamp(1rem, 2.2vw, 1.2rem);
    color: var(--text);
    margin-bottom: 2rem;
    font-weight: 400;
}

.hero .intro {
    font-size: 1.05rem;
    color: var(--text);
    line-height: 1.75;
    max-width: 640px;
    border-left: 3px solid var(--primary);
    padding-left: 1rem;
}

.hero-cta {
    display: inline-block;
    margin-top: 2rem;
    padding: 0.875rem 2rem;
    background: var(--primary);
    color: var(--white);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.975rem;
    border-radius: 0;
    transition: background 0.15s;
    letter-spacing: 0.01em;
}

.hero-cta:hover {
    background: var(--primary-d);
}

/* ── Sections ────────────────────────── */
.section {
    padding: 3.5rem 1.5rem;
    border-bottom: 1px solid var(--gray-20);
}

.section-inner {
    max-width: 860px;
    margin: 0 auto;
}

.section:nth-child(odd) {
    background: var(--white);
}

.section:nth-child(even) {
    background: var(--gray-10);
}

.section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    color: var(--dark);
    line-height: 1.2;
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.section p {
    margin-bottom: 1rem;
    font-size: 0.975rem;
    color: var(--text);
}

/* ── Problem list ────────────────────── */
.problem-list {
    list-style: none;
    margin: 1.25rem 0 0;
    border: 1px solid var(--gray-20);
    background: var(--white);
}

.problem-list li {
    padding: 1rem 1rem 1rem 3.25rem;
    position: relative;
    border-bottom: 1px solid var(--gray-20);
    font-size: 0.95rem;
    color: var(--text);
}

.problem-list li:last-child {
    border-bottom: none;
}

.problem-list li::before {
    content: "—";
    position: absolute;
    left: 1rem;
    top: 1rem;
    color: var(--red);
    font-family: var(--mono);
    font-weight: 500;
}

.problem-list li strong {
    color: var(--dark);
    font-family: var(--mono);
    font-size: 0.82rem;
    font-weight: 500;
    display: block;
    margin-bottom: 0.2rem;
}

/* ── Target grid ─────────────────────── */
.target-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

@media (max-width: 580px) {
    .target-grid { grid-template-columns: 1fr; }
}

.target-box {
    padding: 1.5rem;
    border: 1px solid var(--gray-20);
    background: var(--white);
    border-top: 3px solid transparent;
}

.target-box.not-for {
    border-top-color: var(--red);
    background: var(--red-bg);
    border-color: var(--red-border);
    border-top-color: var(--red);
}

.target-box.is-for {
    border-top-color: var(--green);
    background: var(--green-bg);
    border-color: var(--green-bdr);
    border-top-color: var(--green);
}

.target-box h3 {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 1rem;
    font-family: var(--mono);
}

.target-box.not-for h3 { color: var(--red); }
.target-box.is-for h3  { color: var(--green); }

.target-box ul {
    list-style: none;
}

.target-box ul li {
    padding: 0.3rem 0 0.3rem 1.4rem;
    font-size: 0.9rem;
    color: var(--text);
    position: relative;
    line-height: 1.5;
}

.target-box.not-for ul li::before {
    content: "✕";
    position: absolute;
    left: 0;
    color: var(--red);
    font-size: 0.7rem;
    font-family: var(--mono);
    top: 0.42rem;
}

.target-box.is-for ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--green);
    font-size: 0.8rem;
    font-family: var(--mono);
    top: 0.35rem;
}

/* ── Idea list ───────────────────────── */
.idea-items {
    list-style: none;
    margin-top: 1.25rem;
    border: 1px solid var(--gray-20);
    background: var(--white);
}

.idea-items li {
    padding: 0.9rem 1rem 0.9rem 2.75rem;
    position: relative;
    border-bottom: 1px solid var(--gray-20);
    font-size: 0.95rem;
    color: var(--text);
}

.idea-items li:last-child {
    border-bottom: none;
}

.idea-items li::before {
    content: "→";
    position: absolute;
    left: 1rem;
    top: 0.9rem;
    color: var(--primary);
    font-family: var(--mono);
    font-size: 0.85rem;
}

.status-badge {
    display: inline-block;
    background: var(--primary-bg);
    color: var(--primary);
    border: 1px solid #B0C9FF;
    padding: 0.15rem 0.55rem;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-family: var(--mono);
    vertical-align: middle;
    position: relative;
    top: -2px;
}

/* ── Not-list ────────────────────────── */
.not-list {
    list-style: none;
    margin-top: 1.25rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

@media (max-width: 480px) {
    .not-list { grid-template-columns: 1fr; }
}

.not-list li {
    background: var(--white);
    border: 1px solid var(--gray-20);
    padding: 0.65rem 1rem;
    color: var(--muted);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--mono);
    font-size: 0.82rem;
}

.not-list li::before {
    content: "–";
    color: var(--muted);
    flex-shrink: 0;
}

/* ── Signup form ─────────────────────── */
.form-section {
    background: var(--white) !important;
    border-top: 2px solid var(--primary);
}

.form-section .lead {
    color: var(--dark) !important;
    margin-bottom: 0.5rem;
    font-size: 1.05rem !important;
    font-weight: 600;
}

.form-section .disclaimer {
    color: var(--muted) !important;
    font-size: 0.875rem !important;
    margin-bottom: 2rem;
    line-height: 1.6;
    border-left: 3px solid var(--gray-20);
    padding-left: 1rem;
}

.form-section .founding-note {
    color: var(--dark) !important;
    font-size: 0.9rem !important;
    margin-bottom: 1rem;
    background: var(--primary-bg);
    border-left: 3px solid var(--primary);
    padding: 0.75rem 1rem;
    line-height: 1.6;
}

.signup-form {
    margin-top: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--dark);
}

.form-group .hint {
    display: block;
    font-size: 0.78rem;
    color: var(--muted);
    font-weight: 400;
    margin-top: 0.3rem;
    font-family: var(--mono);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="number"],
.form-group textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    background: var(--white);
    border: 1px solid var(--gray-20);
    border-bottom: 2px solid var(--muted);
    border-radius: 0;
    color: var(--dark);
    font-size: 0.975rem;
    font-family: inherit;
    transition: border-color 0.15s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    border-bottom-color: var(--primary);
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

.radio-group {
    display: flex;
    gap: 1.5rem;
    margin-top: 0.3rem;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 400;
    cursor: pointer;
    color: var(--text);
    font-size: 0.975rem;
}

.radio-group input[type="radio"] {
    width: 1rem;
    height: 1rem;
    accent-color: var(--primary);
    flex-shrink: 0;
}

.error-msg {
    background: var(--red-bg);
    border: 1px solid var(--red-border);
    border-left: 3px solid var(--red);
    color: var(--red);
    padding: 0.875rem 1rem;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.submit-btn {
    background: var(--primary);
    color: var(--white);
    border: none;
    padding: 0.875rem 2rem;
    font-size: 0.975rem;
    font-weight: 600;
    border-radius: 0;
    cursor: pointer;
    width: 100%;
    transition: background 0.15s;
    font-family: inherit;
    letter-spacing: 0.01em;
}

.submit-btn:hover {
    background: var(--primary-d);
}

/* ── Footer ──────────────────────────── */
footer {
    background: var(--gray-10);
    border-top: 1px solid var(--gray-20);
    padding: 2.5rem 1.5rem;
}

.footer-inner {
    max-width: 860px;
    margin: 0 auto;
    text-align: center;
}

.footer-inner p {
    font-size: 0.875rem;
    color: var(--muted);
    margin-bottom: 0.5rem;
}

.footer-inner strong {
    color: var(--dark);
}

.footer-inner a {
    color: var(--primary);
    text-decoration: none;
}

.footer-inner a:hover {
    text-decoration: underline;
}

.footer-small {
    font-size: 0.75rem !important;
    color: var(--gray-20) !important;
    margin-top: 0.25rem;
    font-family: var(--mono);
}

/* ── Tak page ────────────────────────── */
.tak-section {
    min-height: 65vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem 1.5rem;
    background: var(--gray-10);
}

.tak-card {
    max-width: 520px;
    text-align: center;
    background: var(--white);
    border: 1px solid var(--gray-20);
    border-top: 3px solid var(--primary);
    padding: 3rem 2.5rem;
}

.tak-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary);
    font-family: var(--mono);
    font-weight: 500;
}

.tak-card h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--dark);
}

.tak-card p {
    color: var(--text);
    margin-bottom: 0.75rem;
    font-size: 0.975rem;
}

.back-link {
    display: inline-block;
    margin-top: 1.25rem;
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    font-family: var(--mono);
    font-size: 0.85rem;
}

.back-link:hover {
    text-decoration: underline;
}

.tak-contact {
    font-size: 0.82rem;
    color: var(--muted);
    margin-top: 1.25rem;
    margin-bottom: 0;
}

.tak-contact a {
    color: var(--primary);
    text-decoration: none;
}

.tak-contact a:hover {
    text-decoration: underline;
}

/* ── Share box (tak page) ────────────── */
.share-box {
    margin: 2rem 0 1.5rem;
    background: var(--gray-10);
    border: 1px solid var(--gray-20);
    padding: 1.5rem;
    text-align: left;
}

.share-heading {
    font-size: 0.9rem !important;
    font-weight: 700;
    color: var(--dark) !important;
    margin-bottom: 0.4rem !important;
}

.share-sub {
    font-size: 0.82rem !important;
    color: var(--muted) !important;
    margin-bottom: 1rem !important;
    line-height: 1.55;
}

.share-text {
    background: var(--white);
    border: 1px solid var(--gray-20);
    padding: 0.875rem 1rem;
    font-size: 0.82rem;
    color: var(--text);
    line-height: 1.55;
    font-family: var(--mono);
    margin-bottom: 0.75rem;
    word-break: break-word;
    user-select: all;
    cursor: text;
}

.copy-btn {
    background: var(--dark);
    color: var(--white);
    border: none;
    padding: 0.5rem 1.25rem;
    font-size: 0.82rem;
    font-weight: 600;
    border-radius: 0;
    cursor: pointer;
    font-family: inherit;
    transition: background 0.15s;
}

.copy-btn:hover {
    background: #333;
}

.copy-confirm {
    display: none;
    margin-left: 0.75rem;
    font-size: 0.82rem;
    color: var(--green);
    font-family: var(--mono);
    font-weight: 500;
}

/* ── Admin ───────────────────────────── */
.admin-section {
    padding: 2rem 1.5rem;
    max-width: 1100px;
    margin: 0 auto;
}

.admin-section h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
    color: var(--dark);
}

.admin-meta {
    color: var(--muted);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
    font-family: var(--mono);
}

.table-wrapper {
    overflow-x: auto;
}

.signups-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.signups-table th {
    background: var(--dark);
    color: var(--white);
    padding: 0.75rem 0.875rem;
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid var(--primary);
    white-space: nowrap;
    font-family: var(--mono);
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.signups-table td {
    padding: 0.75rem 0.875rem;
    border-bottom: 1px solid var(--gray-20);
    vertical-align: top;
    color: var(--text);
}

.signups-table tr:hover td {
    background: var(--gray-10);
}

.badge-ja {
    background: var(--green-bg);
    color: var(--green);
    padding: 0.15rem 0.5rem;
    font-size: 0.7rem;
    font-weight: 600;
    font-family: var(--mono);
    text-transform: uppercase;
    border: 1px solid var(--green-bdr);
}

.badge-nej {
    background: var(--red-bg);
    color: var(--red);
    padding: 0.15rem 0.5rem;
    font-size: 0.7rem;
    font-weight: 600;
    font-family: var(--mono);
    text-transform: uppercase;
    border: 1px solid var(--red-border);
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--muted);
    font-family: var(--mono);
}

/* ── Mobile ──────────────────────────── */
@media (max-width: 640px) {
    .hero {
        padding: 3.5rem 1.25rem 3rem;
    }
    .section {
        padding: 2.5rem 1.25rem;
    }
}