/* =============================================================================
   Kazi Nazrul Academy — Student Portal Sign-In Stylesheet
   File: pages/css/student-portal.css
   Modern, prestigious academic styling consistent with KNA design system
   ============================================================================= */

:root {
    --sp-navy-950: #070d1e;
    --sp-navy-900: #0f172a;
    --sp-navy-800: #1e293b;
    --sp-navy-700: #334155;
    --sp-sky-700: #0369a1;
    --sp-sky-600: #0284c7;
    --sp-sky-500: #0ea5e9;
    --sp-sky-400: #38bdf8;
    --sp-sky-100: #e0f2fe;
    --sp-sky-50: #f0f9ff;
    --sp-amber-500: #f59e0b;
    --sp-amber-600: #d97706;
    --sp-emerald-600: #059669;
    --sp-emerald-50: #ecfdf5;
    --sp-rose-600: #e11d48;
    --sp-rose-50: #fff1f2;
    --sp-rose-200: #fecdd3;
    --sp-slate-50: #f8fafc;
    --sp-slate-100: #f1f5f9;
    --sp-slate-200: #e2e8f0;
    --sp-slate-300: #cbd5e1;
    --sp-slate-400: #94a3b8;
    --sp-slate-500: #64748b;
    --sp-slate-600: #475569;
    --sp-radius-sm: 8px;
    --sp-radius-md: 12px;
    --sp-radius-lg: 20px;
    --sp-shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.04);
    --sp-shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
    --sp-shadow-elevated: 0 20px 45px -12px rgba(15, 23, 42, 0.12), 0 12px 20px -8px rgba(15, 23, 42, 0.05);
}

/* Page Layout Wrapper & Chrome Clearance */
body[data-portal-page="student-portal"] .main {
    padding-top: 24px;
}

@media (max-width: 768px) {
    body[data-portal-page="student-portal"] .main {
        padding-top: 16px;
    }
}

.sp-portal-wrapper {
    max-width: 1040px;
    margin: 0 auto;
    padding: 8px 16px 48px;
    width: 100%;
    box-sizing: border-box;
}

@media (max-width: 480px) {
    .sp-portal-wrapper {
        padding: 4px 12px 36px;
    }
}

/* Page Intro Subtitle (Clean single-line subtitle matching original) */
.sp-page-subtext {
    text-align: center;
    font-size: 0.92rem;
    color: var(--sp-slate-500);
    margin: 0 0 20px;
    font-weight: 500;
    letter-spacing: -0.01em;
}

/* Master 2-Column Split Card */
.sp-split-card {
    background: #ffffff;
    border: 1px solid var(--sp-slate-200);
    border-radius: var(--sp-radius-lg);
    box-shadow: var(--sp-shadow-elevated);
    display: grid;
    grid-template-columns: 410px 1fr;
    overflow: hidden;
    width: 100%;
    max-width: 1040px;
    margin: 0 auto;
    transition: box-shadow 0.3s ease;
}

@media (max-width: 960px) {
    .sp-split-card {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .sp-split-card {
        border-radius: 16px;
    }
}

/* ═══════════════════════════════════════════════════════════════════
   Left Panel: Institutional Brand & Features Showcase
   ═══════════════════════════════════════════════════════════════════ */
.sp-brand-panel {
    background: radial-gradient(circle at 10% 10%, rgba(14, 165, 233, 0.18) 0%, transparent 60%),
                linear-gradient(150deg, var(--sp-navy-950) 0%, #0c1833 50%, var(--sp-navy-900) 100%);
    color: #ffffff;
    padding: 38px 32px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
}

.sp-brand-crest-wrap {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 24px;
}

.sp-crest-box {
    width: 58px;
    height: 58px;
    border-radius: 50%;
    background: #ffffff;
    padding: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3), 0 0 0 2px rgba(245, 158, 11, 0.5);
    flex-shrink: 0;
}

.sp-crest-box img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.sp-crest-text h3,
.sp-crest-text .sp-crest-title {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    color: #ffffff;
    display: block;
}

.sp-crest-text p {
    margin: 2px 0 0;
    font-size: 0.75rem;
    color: var(--sp-sky-400);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.sp-brand-content h1,
.sp-brand-content h2 {
    font-size: 1.55rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    margin: 0 0 12px;
    line-height: 1.3;
    color: #ffffff;
}

.sp-brand-desc {
    font-size: 0.88rem;
    line-height: 1.6;
    color: #94a3b8;
    margin: 0 0 24px;
}

/* Feature Benefits List */
.sp-portal-features {
    list-style: none;
    padding: 0;
    margin: 0 0 28px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.sp-portal-features li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 0.86rem;
    color: #cbd5e1;
}

.sp-feat-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: rgba(14, 165, 233, 0.15);
    border: 1px solid rgba(14, 165, 233, 0.25);
    color: var(--sp-sky-400);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    flex-shrink: 0;
    margin-top: 1px;
}

.sp-portal-features strong {
    color: #ffffff;
    display: block;
    font-size: 0.9rem;
    margin-bottom: 1px;
}

.sp-brand-footer {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 16px;
    font-size: 0.76rem;
    color: #64748b;
    line-height: 1.5;
}

.sp-brand-footer strong {
    color: #cbd5e1;
}

/* ═══════════════════════════════════════════════════════════════════
   Right Panel: Authentication Form
   ═══════════════════════════════════════════════════════════════════ */
.sp-form-panel {
    padding: 40px 38px;
    background: #ffffff;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

@media (max-width: 600px) {
    .sp-form-panel {
        padding: 28px 20px;
    }
}

.sp-form-header {
    margin-bottom: 24px;
}

.sp-portal-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--sp-sky-50);
    color: var(--sp-sky-700);
    border: 1px solid var(--sp-sky-100);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.sp-form-header h2 {
    font-size: 1.7rem;
    font-weight: 800;
    color: var(--sp-navy-900);
    margin: 0 0 4px;
    letter-spacing: -0.02em;
}

.sp-form-header p {
    font-size: 0.9rem;
    color: var(--sp-slate-500);
    margin: 0;
}

/* Status Alert Banner */
.sp-alert-box {
    display: none;
    padding: 12px 16px;
    border-radius: var(--sp-radius-md);
    margin-bottom: 20px;
    font-size: 0.86rem;
    line-height: 1.45;
    align-items: flex-start;
    gap: 10px;
    animation: sp-slide-down 0.25s ease-out forwards;
}

.sp-alert-box.show {
    display: flex;
}

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

.sp-alert-danger {
    background: var(--sp-rose-50);
    border: 1px solid var(--sp-rose-200);
    color: var(--sp-rose-600);
}

.sp-alert-warning {
    background: #fffbeb;
    border: 1px solid #fde68a;
    color: #b45309;
}

.sp-alert-info {
    background: var(--sp-sky-50);
    border: 1px solid #bae6fd;
    color: var(--sp-sky-700);
}

.sp-alert-icon {
    font-size: 1.05rem;
    margin-top: 2px;
    flex-shrink: 0;
}

.sp-alert-content {
    flex-grow: 1;
}

/* Segmented Method Switcher */
.sp-segmented-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: var(--sp-slate-100);
    padding: 5px;
    border-radius: var(--sp-radius-md);
    margin-bottom: 24px;
    border: 1px solid var(--sp-slate-200);
}

.sp-seg-tab {
    background: transparent;
    border: none;
    padding: 11px 14px;
    min-height: 44px;
    box-sizing: border-box;
    border-radius: var(--sp-radius-sm);
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--sp-slate-600);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.sp-seg-tab:hover {
    color: var(--sp-navy-900);
}

.sp-seg-tab.active {
    background: #ffffff;
    color: var(--sp-sky-700);
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.08);
}

/* Form Groups & Inputs */
.sp-field-group {
    margin-bottom: 20px;
}

.sp-field-label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--sp-navy-900);
    margin-bottom: 6px;
}

.sp-input-box {
    position: relative;
    display: flex;
    align-items: center;
}

.sp-field-icon {
    position: absolute;
    left: 14px;
    font-size: 0.95rem;
    color: var(--sp-slate-400);
    pointer-events: none;
    transition: color 0.2s ease;
}

.sp-text-input {
    width: 100%;
    padding: 12px 14px 12px 42px;
    border: 1.5px solid var(--sp-slate-200);
    border-radius: var(--sp-radius-md);
    font-size: 0.925rem;
    font-family: inherit;
    color: var(--sp-navy-900);
    background: #ffffff;
    transition: all 0.2s ease;
    box-sizing: border-box;
}

.sp-text-input:focus {
    outline: none;
    border-color: var(--sp-sky-600);
    box-shadow: 0 0 0 3.5px rgba(2, 132, 199, 0.15);
}

.sp-input-box:focus-within .sp-field-icon {
    color: var(--sp-sky-600);
}

.sp-text-input.uppercase {
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-weight: 600;
}

.sp-field-hint {
    display: block;
    font-size: 0.74rem;
    color: var(--sp-slate-400);
    margin-top: 5px;
}

/* Math CAPTCHA Box */
.sp-captcha-wrap {
    display: flex;
    gap: 10px;
    align-items: stretch;
}

.sp-captcha-badge {
    background: #f0fdf4;
    border: 1.5px solid #bbf7d0;
    border-radius: var(--sp-radius-md);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    font-size: 1.15rem;
    color: #166534;
    font-family: monospace;
    white-space: nowrap;
    letter-spacing: 0.05em;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.03);
}

.sp-captcha-refresh-btn {
    background: #ffffff;
    border: 1px solid #86efac;
    color: #15803d;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    transition: all 0.2s ease;
}

.sp-captcha-refresh-btn:hover {
    background: #15803d;
    color: #ffffff;
    transform: rotate(180deg);
}

.sp-captcha-text-input {
    padding-left: 14px;
    font-size: 1.05rem;
    font-weight: 700;
    text-align: center;
}

/* Submit Action Button */
.sp-btn-submit {
    width: 100%;
    background: linear-gradient(135deg, var(--sp-sky-600) 0%, var(--sp-sky-700) 100%);
    color: #ffffff;
    border: none;
    padding: 14px 20px;
    min-height: 48px;
    box-sizing: border-box;
    border-radius: var(--sp-radius-md);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    box-shadow: 0 4px 14px rgba(2, 132, 199, 0.28);
    transition: all 0.22s ease;
    margin-top: 8px;
}

.sp-btn-submit:hover:not(:disabled) {
    background: linear-gradient(135deg, #0284c7 0%, #075985 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 22px rgba(2, 132, 199, 0.35);
}

.sp-btn-submit:disabled {
    opacity: 0.65;
    cursor: not-allowed;
    transform: none;
}

/* Collapsible ID Help Accordion */
.sp-help-accordion {
    margin-top: 24px;
    border: 1px solid var(--sp-slate-200);
    border-radius: var(--sp-radius-md);
    background: var(--sp-slate-50);
    overflow: hidden;
    font-size: 0.825rem;
}

.sp-help-header {
    padding: 12px 16px;
    min-height: 44px;
    box-sizing: border-box;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 700;
    color: var(--sp-navy-800);
    user-select: none;
    transition: background 0.15s ease;
}

.sp-help-header:hover {
    background: var(--sp-slate-100);
}

@media (max-width: 380px) {
    .sp-captcha-wrap {
        gap: 8px;
    }
    .sp-captcha-badge {
        padding: 8px 10px;
        font-size: 1rem;
        gap: 8px;
    }
    .sp-captcha-text-input {
        padding-left: 8px;
        padding-right: 8px;
        font-size: 0.95rem;
    }
}

.sp-help-body {
    padding: 14px 16px 16px;
    border-top: 1px solid var(--sp-slate-200);
    color: var(--sp-slate-600);
    line-height: 1.6;
    background: #ffffff;
}

.sp-help-body code {
    background: var(--sp-sky-50);
    color: var(--sp-sky-700);
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid #bae6fd;
    font-weight: 700;
    font-size: 0.78rem;
}

/* Staff Shortcut */
.sp-staff-shortcut {
    margin-top: 20px;
    text-align: center;
    font-size: 0.825rem;
    color: var(--sp-slate-500);
}

.sp-staff-shortcut a {
    color: var(--sp-sky-600);
    text-decoration: none;
    font-weight: 700;
}

.sp-staff-shortcut a:hover {
    text-decoration: underline;
}