:root {
    --primary: #6366F1;
    --secondary: #8B5CF6;
    --text-primary: #0F172A;
    --text-secondary: #64748B;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8FAFC;
    --bg-tertiary: #EEF2FF;
    --border: #E2E8F0;
    --gradient: linear-gradient(135deg, #6366F1 0%, #8B5CF6 100%);
}

.signup-body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%);
    color: var(--text-primary);
}

.signup-header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.signup-container {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.signup-header .logo {
    text-decoration: none;
}

.signup-header .logo svg {
    margin-right: 12px;
}

.link-back {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.link-back:hover {
    color: var(--primary);
}

.signup-main {
    padding: 64px 16px 96px;
}

.signup-card {
    max-width: 960px;
    margin: 0 auto;
    background: var(--bg-primary);
    border-radius: 24px;
    border: 1px solid var(--border);
    box-shadow: 0 30px 60px -20px rgba(79, 70, 229, 0.25);
    padding: 48px;
}

.signup-intro {
    margin-bottom: 32px;
}

.signup-intro h1 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 12px;
}

.signup-intro p {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 560px;
}

.signup-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.option-list {
    display: grid;
    gap: 12px;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg-secondary);
}

.option-list-other-input {
    width: 100%;
    padding: 12px 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    font-size: 15px;
    font-family: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    margin-top: 4px;
}

.option-list-other-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.12);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 14px;
    color: var(--text-primary);
}

.form-field span {
    font-weight: 600;
}

.form-field input,
.form-field select,
.form-field textarea {
    padding: 12px 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    font-size: 15px;
    font-family: inherit;
    color: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    background: #FFF;
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.12);
}

.form-field textarea {
    resize: vertical;
}

.form-checkbox {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
}

.form-checkbox input {
    margin-top: 4px;
}

.btn-large {
    padding: 16px 24px;
    font-size: 16px;
    font-weight: 600;
}

.btn-primary {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.form-disclaimer {
    font-size: 13px;
    color: var(--text-secondary);
}

.form-disclaimer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.form-disclaimer a:hover {
    text-decoration: underline;
}

.form-status {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    min-height: 20px;
}

.form-status.success {
    color: #16A34A;
}

.form-status.error {
    color: #DC2626;
}

@media (max-width: 900px) {
    .signup-card {
        padding: 32px;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .signup-header {
        position: static;
    }

    .signup-container {
        flex-direction: column;
        gap: 16px;
    }

    .signup-main {
        padding: 32px 16px 64px;
    }

    .signup-card {
        padding: 24px;
        border-radius: 16px;
    }

    .signup-intro h1 {
        font-size: 26px;
    }
}