/**
 * Student Registration Form - Frontend Styles
 * Scoped under .srf-container to prevent theme collisions.
 */

:root {
    --srf-primary: #4f46e5;
    --srf-primary-hover: #4338ca;
    --srf-primary-light: #eef2ff;
    --srf-text: #1f2937;
    --srf-text-muted: #6b7280;
    --srf-border: #d1d5db;
    --srf-border-focus: #6366f1;
    --srf-bg: #ffffff;
    --srf-bg-subtle: #f9fafb;
    --srf-error: #e11d48;
    --srf-error-bg: #fff1f2;
    --srf-error-border: #fecdd3;
    --srf-success: #059669;
    --srf-success-bg: #ecfdf5;
    --srf-success-border: #a7f3d0;
    --srf-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --srf-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --srf-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --srf-radius: 10px;
    --srf-radius-sm: 6px;
    --srf-transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.srf-container {
    width: 100%;
    max-width: 680px;
    margin: 2rem auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    color: var(--srf-text);
    box-sizing: border-box;
}

.srf-container *,
.srf-container *::before,
.srf-container *::after {
    box-sizing: inherit;
}

.srf-card {
    background: var(--srf-bg);
    border: 1px solid var(--srf-border);
    border-radius: var(--srf-radius);
    padding: 2.25rem;
    box-shadow: var(--srf-shadow-lg);
}

/* Header */
.srf-header {
    margin-bottom: 1.75rem;
    text-align: center;
}

.srf-title {
    margin: 0 0 0.5rem 0;
    font-size: 1.65rem;
    font-weight: 700;
    color: var(--srf-text);
    line-height: 1.25;
}

.srf-subtitle {
    margin: 0;
    font-size: 0.95rem;
    color: var(--srf-text-muted);
    line-height: 1.45;
}

/* Alert Notifications */
.srf-alert {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    border-radius: var(--srf-radius-sm);
    margin-bottom: 1.5rem;
    font-size: 0.925rem;
    line-height: 1.45;
    animation: srfSlideDown 0.3s ease-out;
}

@keyframes srfSlideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.srf-alert-success {
    background-color: var(--srf-success-bg);
    border: 1px solid var(--srf-success-border);
    color: #065f46;
}

.srf-alert-success .srf-alert-icon::before {
    content: "✓";
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    background-color: var(--srf-success);
    color: #ffffff;
    border-radius: 50%;
    font-size: 13px;
    font-weight: bold;
}

.srf-alert-error {
    background-color: var(--srf-error-bg);
    border: 1px solid var(--srf-error-border);
    color: #9f1239;
}

.srf-alert-error .srf-alert-icon::before {
    content: "!";
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    background-color: var(--srf-error);
    color: #ffffff;
    border-radius: 50%;
    font-size: 13px;
    font-weight: bold;
}

/* Form Layout */
.srf-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.srf-row {
    display: flex;
    gap: 1rem;
    width: 100%;
}

.srf-row-2 > .srf-field-group {
    flex: 1;
    min-width: 0;
}

.srf-field-group {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.srf-label {
    font-size: 0.885rem;
    font-weight: 600;
    color: var(--srf-text);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.srf-required {
    color: var(--srf-error);
    font-weight: bold;
}

.srf-input {
    width: 100%;
    height: 44px;
    padding: 0 0.875rem;
    font-size: 0.95rem;
    color: var(--srf-text);
    background-color: #ffffff;
    border: 1px solid var(--srf-border);
    border-radius: var(--srf-radius-sm);
    outline: none;
    transition: var(--srf-transition);
    box-shadow: var(--srf-shadow-sm);
}

.srf-input:hover {
    border-color: #9ca3af;
}

.srf-input:focus {
    border-color: var(--srf-border-focus);
    box-shadow: 0 0 0 3.5px rgba(99, 102, 241, 0.18);
}

.srf-input.srf-has-error {
    border-color: var(--srf-error) !important;
    background-color: var(--srf-error-bg);
}

.srf-field-error {
    font-size: 0.8rem;
    color: var(--srf-error);
    min-height: 1.1rem;
    display: none;
    margin-top: 0.15rem;
}

.srf-field-error.srf-visible {
    display: block;
    animation: srfFadeIn 0.2s ease-in;
}

.srf-field-hint {
    font-size: 0.8rem;
    color: var(--srf-text-muted);
    margin-top: 0.15rem;
}

@keyframes srfFadeIn {
    from { opacity: 0; transform: translateY(-3px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Radio Cards */
.srf-radio-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.875rem;
    margin-top: 0.25rem;
}

.srf-radio-card {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.875rem 1rem;
    border: 1.5px solid var(--srf-border);
    border-radius: var(--srf-radius-sm);
    background-color: var(--srf-bg-subtle);
    cursor: pointer;
    transition: var(--srf-transition);
    position: relative;
    user-select: none;
}

.srf-radio-card:hover {
    border-color: #a5b4fc;
    background-color: #ffffff;
}

.srf-radio-input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.srf-radio-custom {
    width: 18px;
    height: 18px;
    border: 2px solid var(--srf-border);
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
    margin-top: 2px;
    position: relative;
    transition: var(--srf-transition);
    background: #ffffff;
}

.srf-radio-card:hover .srf-radio-custom {
    border-color: var(--srf-primary);
}

.srf-radio-input:checked + .srf-radio-custom {
    border-color: var(--srf-primary);
}

.srf-radio-input:checked + .srf-radio-custom::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    background-color: var(--srf-primary);
    border-radius: 50%;
}

.srf-radio-card:has(.srf-radio-input:checked) {
    border-color: var(--srf-primary);
    background-color: var(--srf-primary-light);
    box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.12);
}

.srf-radio-label-wrapper {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.srf-radio-heading {
    font-size: 0.925rem;
    font-weight: 600;
    color: var(--srf-text);
}

.srf-radio-desc {
    font-size: 0.775rem;
    color: var(--srf-text-muted);
}

/* Expiration Wrapper Transition */
.srf-expiration-field-group {
    background: #f8fafc;
    border: 1px dashed #cbd5e1;
    border-radius: var(--srf-radius-sm);
    padding: 1rem;
    animation: srfReveal 0.25s ease-out;
}

@keyframes srfReveal {
    from {
        opacity: 0;
        transform: translateY(-6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Submit Area & Button */
.srf-submit-area {
    margin-top: 0.5rem;
}

.srf-submit-btn {
    width: 100%;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #4f46e5 0%, #4338ca 100%);
    color: #ffffff !important;
    border: none;
    border-radius: var(--srf-radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
    transition: var(--srf-transition);
    outline: none;
}

.srf-submit-btn:hover {
    background: linear-gradient(135deg, #4338ca 0%, #3730a3 100%);
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
    transform: translateY(-1px);
}

.srf-submit-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(79, 70, 229, 0.2);
}

.srf-submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none !important;
}

/* Spinner Loader */
.srf-btn-loader {
    width: 18px;
    height: 18px;
    border: 2.5px solid rgba(255, 255, 255, 0.35);
    border-radius: 50%;
    border-top-color: #ffffff;
    animation: srfSpin 0.7s linear infinite;
    display: inline-block;
}

@keyframes srfSpin {
    to {
        transform: rotate(360deg);
    }
}

/* Responsive Mobile Rules */
@media (max-width: 600px) {
    .srf-card {
        padding: 1.5rem 1.25rem;
    }

    .srf-row {
        flex-direction: column;
        gap: 1.25rem;
    }

    .srf-radio-cards {
        grid-template-columns: 1fr;
    }
}