/**
 * Platform Registration Page Styles
 * BEM Methodology + Matte Design + Unified Color Palette
 */

/* ============================================================
   Container & Layout
   ============================================================ */

.sc-platform-registration {
    min-height: calc(100vh - 60px);
    padding: 2rem 1rem;
    background: linear-gradient(135deg, #E8F4F8 0%, #F5F9FA 100%);
}

.sc-platform-registration__container {
    max-width: 900px;
    margin: 0 auto;
    background: #FFFFFF;
    border-radius: 16px;
    box-shadow: 0 4px 24px rgba(74, 144, 226, 0.08);
    overflow: hidden;
}

/* ============================================================
   Header
   ============================================================ */

.sc-platform-registration__header {
    background: linear-gradient(135deg, #4A90E2 0%, #357ABD 100%);
    color: #FFFFFF;
    text-align: center;
    padding: 3rem 2rem;
}

.sc-platform-registration__icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.95;
}

.sc-platform-registration__title {
    font-family: 'M PLUS Rounded 1c', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 0.5rem 0;
    color: #FFFFFF;
}

.sc-platform-registration__subtitle {
    font-size: 1rem;
    margin: 0;
    opacity: 0.9;
}

/* ============================================================
   Form Container
   ============================================================ */

.sc-platform-registration__form-container {
    padding: 2.5rem;
}

.sc-platform-registration__form {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* ============================================================
   Alerts
   ============================================================ */

.sc-platform-registration__alert {
    padding: 1rem 1.25rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.sc-platform-registration__alert i {
    font-size: 1.1rem;
}

.sc-platform-registration__alert--success {
    background: #E8F8F0;
    border: 1px solid #A7E9C1;
    color: #2C7A4B;
}

.sc-platform-registration__alert--error {
    background: #FFF5F5;
    border: 1px solid #FED7D7;
    color: #C53030;
}

.sc-platform-registration__alert--info {
    background: #E8F4F8;
    border: 1px solid #B8DCF0;
    color: #2C5A7A;
}

/* ============================================================
   Section
   ============================================================ */

.sc-platform-registration__section {
    border-bottom: 1px solid #E2E8F0;
    padding-bottom: 2rem;
}

.sc-platform-registration__section:last-of-type {
    border-bottom: none;
    padding-bottom: 0;
}

.sc-platform-registration__section-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: #2D3748;
    margin: 0 0 1.5rem 0;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid #E8F4F8;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sc-platform-registration__section-title i {
    color: #4A90E2;
    font-size: 1.2rem;
}

.sc-platform-registration__section-note {
    font-size: 0.9rem;
    color: #718096;
    margin: 0 0 1.25rem 0;
}

/* ============================================================
   Form Grid
   ============================================================ */

.sc-platform-registration__row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.sc-platform-registration__row:last-child {
    margin-bottom: 0;
}

.sc-platform-registration__col {
    min-width: 0;
}

/* ============================================================
   Form Field
   ============================================================ */

.sc-platform-registration__field {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.sc-platform-registration__label {
    font-size: 0.95rem;
    font-weight: 500;
    color: #2D3748;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sc-platform-registration__label i {
    color: #4A90E2;
    font-size: 0.9rem;
}

.sc-platform-registration__required {
    color: #E53E3E;
    font-weight: 600;
}

.sc-platform-registration__input {
    padding: 0.75rem 1rem;
    border: 2px solid #E2E8F0;
    border-radius: 8px;
    font-size: 1rem;
    font-family: 'Noto Sans JP', sans-serif;
    color: #2D3748;
    background: #FFFFFF;
    transition: all 0.2s ease;
}

.sc-platform-registration__input:focus {
    outline: none;
    border-color: #4A90E2;
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.sc-platform-registration__input--error {
    border-color: #E53E3E;
    background: #FFF5F5;
}

.sc-platform-registration__input--error:focus {
    border-color: #E53E3E;
    box-shadow: 0 0 0 3px rgba(229, 62, 62, 0.1);
}

.sc-platform-registration__error {
    font-size: 0.875rem;
    color: #C53030;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sc-platform-registration__error i {
    font-size: 0.9rem;
}

.sc-platform-registration__help {
    font-size: 0.875rem;
    color: #718096;
    line-height: 1.5;
}

/* ============================================================
   Form Actions
   ============================================================ */

.sc-platform-registration__actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding-top: 2rem;
    border-top: 1px solid #E2E8F0;
}

.sc-platform-registration__btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'Noto Sans JP', sans-serif;
}

.sc-platform-registration__btn--primary {
    background: linear-gradient(135deg, #4A90E2 0%, #357ABD 100%);
    color: #FFFFFF;
    box-shadow: 0 2px 8px rgba(74, 144, 226, 0.2);
}

.sc-platform-registration__btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(74, 144, 226, 0.3);
}

.sc-platform-registration__btn--primary:active {
    transform: translateY(0);
}

.sc-platform-registration__btn--secondary {
    background: #FFFFFF;
    color: #718096;
    border: 2px solid #E2E8F0;
}

.sc-platform-registration__btn--secondary:hover {
    background: #F7FAFC;
    border-color: #CBD5E0;
    color: #4A5568;
}

/* ============================================================
   Responsive Design
   ============================================================ */

@media (max-width: 768px) {
    .sc-platform-registration {
        padding: 1rem 0.5rem;
    }
    
    .sc-platform-registration__form-container {
        padding: 1.5rem;
    }
    
    .sc-platform-registration__header {
        padding: 2rem 1.5rem;
    }
    
    .sc-platform-registration__title {
        font-size: 1.5rem;
    }
    
    .sc-platform-registration__row {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .sc-platform-registration__actions {
        flex-direction: column-reverse;
    }
    
    .sc-platform-registration__btn {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .sc-platform-registration__header {
        padding: 1.5rem 1rem;
    }
    
    .sc-platform-registration__title {
        font-size: 1.3rem;
    }
    
    .sc-platform-registration__icon {
        font-size: 2.5rem;
    }
    
    .sc-platform-registration__form-container {
        padding: 1rem;
    }
}