:root {
    --ink: #0f1219;
    --slate: #1d2432;
    --sun: #f2c94c;
    --mist: rgba(255, 255, 255, 0.08);
    --danger: #ff9f9f;
    --mint: #41d3a6;
    color-scheme: dark;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: radial-gradient(circle at top, #273149, #0e1118 55%);
    color: #f5f5f5;
    font-family: "Space Grotesk", "Segoe UI", sans-serif;
}

.signup-shell {
    width: min(940px, 92vw);
    margin: 2rem auto 4rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.signup-hero {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding: 1.5rem;
    border-radius: 16px;
    background: rgba(15, 18, 25, 0.85);
    border: 1px solid rgba(242, 201, 76, 0.2);
}

.brand {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.brand img {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.4rem;
    box-shadow: 0 0 20px rgba(242, 201, 76, 0.35);
}

.brand h1 {
    margin: 0;
    font-size: 2rem;
    letter-spacing: 0.06em;
    font-family: "Orbitron", "Space Grotesk", sans-serif;
}

.brand p {
    margin: 0.3rem 0 0;
    color: rgba(255, 255, 255, 0.7);
}

.stepper {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.5rem;
    margin: 0;
    padding: 0;
}

.step {
    padding: 0.6rem 0.4rem;
    text-align: center;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.06);
    font-size: 0.85rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.step.active {
    background: var(--sun);
    color: var(--ink);
    font-weight: 700;
}

form {
    background: rgba(15, 18, 25, 0.85);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid var(--mist);
}

.form-step {
    display: none;
}

.form-step.active {
    display: block;
}

.field-grid {
    display: grid;
    gap: 1.5rem;
}

label {
    display: grid;
    gap: 0.5rem;
    font-size: 0.95rem;
}

input {
    padding: 0.8rem 0.9rem;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.04);
    color: #f5f5f5;
    font-size: 1rem;
}

select {
    padding: 0.8rem 0.9rem;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.04);
    color: #f5f5f5;
    font-size: 1rem;
}

select option,
select optgroup {
    background-color: var(--ink);
    color: #f5f5f5;
}

select option:disabled {
    color: rgba(245, 245, 245, 0.6);
}

small {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.8rem;
}

.upload {
    padding: 1rem;
    border-radius: 12px;
    border: 1px dashed rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.03);
}

.upload-status {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.7);
}

.error {
    color: var(--danger);
    font-size: 0.8rem;
    min-height: 1em;
}

.form-actions {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
    gap: 1rem;
}

.capacity-block {
    margin-top: 1.5rem;
    padding: 1.2rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.02);
}

.capacity-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.capacity-header h3 {
    margin: 0;
    font-size: 1rem;
}

.unit-toggle {
    display: flex;
    gap: 1rem;
    font-size: 0.85rem;
}

.unit-toggle label {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
}

.capabilities-block {
    margin-top: 1rem;
}

.capabilities-block p {
    margin: 0 0 0.5rem 0;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.75);
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 0.5rem;
}

.checkbox-grid label {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.85rem;
}

button {
    padding: 0.85rem 1.4rem;
    border-radius: 10px;
    border: none;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    cursor: pointer;
}

#backBtn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: #f5f5f5;
}

#continueBtn,
#submitBtn {
    background: var(--sun);
    color: var(--ink);
}

.review-summary {
    padding: 1rem;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.05);
    margin-bottom: 1.5rem;
}

.consent {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    margin-bottom: 0.75rem;
}

.confirmation {
    background: rgba(15, 18, 25, 0.9);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid var(--mist);
    text-align: left;
}

.confirmation-copy {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.confirmation-actions {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.admin-link {
    padding: 0.85rem 1.4rem;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: #f5f5f5;
    text-decoration: none;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

@media (max-width: 700px) {
    .stepper {
        grid-template-columns: repeat(2, 1fr);
    }

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

    button {
        width: 100%;
    }
}