:root {
    --kb-navy: #071225;
    --kb-blue: #14345f;
    --kb-blue-gray: #dbe6f5;
    --kb-light: #f8fbff;
    --kb-orange: #ff7a2f;
    --kb-purple: #6f5cff;
    --kb-glass: rgba(255, 255, 255, 0.64);
    --kb-line: rgba(20, 52, 95, 0.14);
}

body {
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Tahoma, Arial, sans-serif;
}

.krubom-index-page {
    min-height: 100vh;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Tahoma, Arial, sans-serif;
    background:
        linear-gradient(var(--kb-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--kb-line) 1px, transparent 1px),
        linear-gradient(115deg, rgba(111, 92, 255, 0.16), transparent 34%),
        linear-gradient(245deg, rgba(255, 122, 47, 0.13), transparent 38%),
        linear-gradient(135deg, #edf4ff 0%, #c8d8ef 46%, #eaf0f8 100%);
    background-size: 96px 96px, 96px 96px, auto, auto, auto;
    color: var(--kb-navy);
}

.krubom-index-shell {
    width: 100%;
    min-height: 100vh;
}

.kb-index {
    position: relative;
    max-width: 1440px;
    min-height: 100vh;
    margin: 0 auto;
    padding: 36px;
    overflow: hidden;
}

.kb-topbar {
    position: relative;
    z-index: 2;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
    margin-bottom: 24px;
}

.kb-mark {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    color: var(--kb-navy);
    text-decoration: none;
}

.kb-mark-icon {
    display: grid;
    place-items: center;
    width: 46px;
    height: 46px;
    border-radius: 16px;
    color: #fff;
    font-weight: 800;
    background: linear-gradient(135deg, var(--kb-orange), var(--kb-purple), var(--kb-blue));
    box-shadow: 0 16px 35px rgba(20, 52, 95, 0.22);
}

.kb-mark strong,
.kb-mark small {
    display: block;
    line-height: 1.1;
}

.kb-mark strong {
    font-size: 1rem;
    letter-spacing: 0.04em;
}

.kb-mark small {
    color: #58708f;
    margin-top: 5px;
}

.kb-topbar-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.kb-action {
    border: 1px solid rgba(255, 255, 255, 0.74);
    border-radius: 999px;
    padding: 10px 18px;
    color: #fff;
    text-decoration: none;
    background: rgba(7, 18, 37, 0.86);
    box-shadow: 0 14px 32px rgba(7, 18, 37, 0.18);
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.kb-action:hover {
    color: #fff;
    transform: translateY(-2px);
    background: var(--kb-blue);
    box-shadow: 0 18px 40px rgba(7, 18, 37, 0.24);
}

.kb-action-secondary {
    background: rgba(255, 255, 255, 0.68);
    color: var(--kb-navy);
}

.kb-action-secondary:hover {
    color: var(--kb-navy);
    background: #fff;
}

.kb-hero-panel {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 24px;
    align-items: end;
    min-height: 330px;
    margin-bottom: 24px;
    padding: clamp(28px, 5vw, 56px);
    border: 1px solid rgba(255, 255, 255, 0.72);
    border-radius: 34px;
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.76), rgba(219, 230, 245, 0.52)),
        linear-gradient(120deg, rgba(255, 122, 47, 0.13), rgba(111, 92, 255, 0.16));
    box-shadow: 0 28px 70px rgba(20, 52, 95, 0.18);
    backdrop-filter: blur(20px);
    overflow: hidden;
}

.kb-hero-panel::after {
    content: "";
    position: absolute;
    inset: auto -8% -48% 50%;
    height: 420px;
    background: radial-gradient(circle, rgba(7, 18, 37, 0.16), transparent 60%);
}

.kb-eyebrow {
    display: inline-flex;
    margin-bottom: 18px;
    border-radius: 999px;
    padding: 8px 14px;
    color: #fff;
    background: linear-gradient(135deg, var(--kb-orange), var(--kb-purple));
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.kb-hero-copy h1 {
    max-width: 880px;
    margin: 0;
    color: #060b18;
    font-size: clamp(3rem, 7vw, 6.8rem);
    line-height: 0.94;
    letter-spacing: 0;
}

.kb-hero-copy h1 span {
    display: block;
}

.kb-hero-copy p {
    max-width: 630px;
    margin: 22px 0 0;
    color: #506985;
    font-size: clamp(1rem, 1.4vw, 1.2rem);
}

.kb-hero-meta {
    display: grid;
    gap: 12px;
    min-width: 172px;
}

.kb-metric {
    padding: 18px;
    border: 1px solid rgba(255, 255, 255, 0.78);
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.56);
    backdrop-filter: blur(16px);
    box-shadow: 0 16px 30px rgba(20, 52, 95, 0.1);
}

.kb-metric span,
.kb-metric small {
    display: block;
}

.kb-metric span {
    color: var(--kb-navy);
    font-size: 2rem;
    font-weight: 800;
}

.kb-metric small {
    color: #5d7592;
}

.kb-metric-accent {
    background: linear-gradient(135deg, rgba(255, 122, 47, 0.2), rgba(111, 92, 255, 0.18));
}

.kb-bento-grid {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-rows: 230px;
    gap: 18px;
}

.admin-announcement-panel {
    position: relative;
    z-index: 1;
    padding: 20px;
    border: 1px solid rgba(255, 255, 255, 0.68);
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.68);
    box-shadow: 0 18px 40px rgba(20, 52, 95, 0.12);
    backdrop-filter: blur(16px);
}

.admin-announcement-item {
    padding: 18px;
    border: 1px solid rgba(147, 197, 253, 0.58);
    border-radius: 18px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.84), rgba(239, 246, 255, 0.74));
}

.kb-system-card,
.kb-empty-card {
    position: relative;
    min-width: 0;
    border-radius: 30px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.66);
    background: var(--kb-glass);
    box-shadow: 0 24px 56px rgba(20, 52, 95, 0.16);
    backdrop-filter: blur(18px);
}

.kb-card-feature {
    grid-column: span 2;
    grid-row: span 2;
}

.kb-card-tall {
    grid-row: span 2;
}

.kb-card-wide {
    grid-column: span 2;
}

.kb-system-link {
    position: relative;
    display: block;
    width: 100%;
    height: 100%;
    color: #fff;
    text-decoration: none;
}

.kb-system-image {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.02);
    transition: transform 0.45s ease, filter 0.45s ease;
}

.kb-system-overlay {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg, rgba(7, 18, 37, 0.1), rgba(7, 18, 37, 0.74)),
        linear-gradient(135deg, rgba(111, 92, 255, 0.18), rgba(255, 122, 47, 0.16));
    transition: opacity 0.3s ease;
}

.kb-system-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 100%;
    padding: 24px;
}

.kb-system-number {
    align-self: flex-start;
    border-radius: 999px;
    padding: 8px 12px;
    color: var(--kb-navy);
    background: rgba(255, 255, 255, 0.82);
    font-weight: 800;
}

.kb-system-content h2 {
    margin: 0 0 8px;
    color: #fff;
    font-size: clamp(1.5rem, 2.2vw, 2.8rem);
    line-height: 1.02;
}

.kb-system-content p {
    max-width: 520px;
    margin: 0;
    color: rgba(255, 255, 255, 0.78);
}

.kb-enter {
    align-self: flex-start;
    margin-top: 20px;
    border-radius: 999px;
    padding: 10px 16px;
    color: #fff;
    background: rgba(255, 122, 47, 0.95);
    box-shadow: 0 14px 32px rgba(255, 122, 47, 0.22);
    font-weight: 700;
}

.kb-system-card:hover .kb-system-image {
    transform: scale(1.08);
    filter: saturate(1.1) contrast(1.04);
}

.kb-system-card:hover {
    box-shadow: 0 34px 76px rgba(20, 52, 95, 0.25);
}

.kb-empty-card {
    grid-column: 1 / -1;
    padding: 34px;
}

@media (max-width: 1199.98px) {
    .kb-bento-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .kb-card-tall,
    .kb-card-wide {
        grid-row: span 1;
        grid-column: span 1;
    }
}

.krubom-admin-page {
    min-height: 100vh;
    background:
        linear-gradient(var(--kb-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--kb-line) 1px, transparent 1px),
        linear-gradient(115deg, rgba(111, 92, 255, 0.14), transparent 34%),
        linear-gradient(245deg, rgba(255, 122, 47, 0.12), transparent 38%),
        linear-gradient(135deg, #eef5ff 0%, #cfddf0 48%, #f7fbff 100%);
    background-size: 96px 96px, 96px 96px, auto, auto, auto;
    color: var(--kb-navy);
}

.krubom-admin-page .navbar {
    margin: 18px auto 24px;
    max-width: 1120px;
    border: 1px solid rgba(255, 255, 255, 0.62);
    border-radius: 24px;
    background: rgba(7, 18, 37, 0.82);
    box-shadow: 0 24px 56px rgba(20, 52, 95, 0.18);
    backdrop-filter: blur(18px);
}

.krubom-admin-page .navbar .container {
    padding-left: 18px;
    padding-right: 18px;
}

.kb-admin-shell {
    position: relative;
}

.krubom-admin-page .page-title-actions {
    margin-bottom: 22px !important;
    padding: 26px;
    border: 1px solid rgba(255, 255, 255, 0.72);
    border-radius: 30px;
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.72), rgba(219, 230, 245, 0.54)),
        linear-gradient(120deg, rgba(255, 122, 47, 0.12), rgba(111, 92, 255, 0.15));
    box-shadow: 0 24px 58px rgba(20, 52, 95, 0.14);
    backdrop-filter: blur(18px);
}

.krubom-admin-page .page-title-actions h1 {
    color: #060b18;
    font-weight: 800;
}

.krubom-admin-page .card {
    border: 1px solid rgba(255, 255, 255, 0.66);
    border-radius: 26px;
    background: rgba(255, 255, 255, 0.66);
    box-shadow: 0 22px 54px rgba(20, 52, 95, 0.14);
    backdrop-filter: blur(18px);
}

.krubom-admin-page .card-body {
    padding: 24px;
}

.krubom-admin-page .stat {
    position: relative;
    overflow: hidden;
    border-left: 0;
}

.krubom-admin-page .stat::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 122, 47, 0.13), rgba(111, 92, 255, 0.16));
    pointer-events: none;
}

.krubom-admin-page .stat .card-body {
    position: relative;
}

.krubom-admin-page .display-6 {
    color: var(--kb-navy);
    font-weight: 800;
}

.krubom-admin-page .table {
    --bs-table-bg: transparent;
    --bs-table-border-color: rgba(20, 52, 95, 0.12);
    color: var(--kb-navy);
}

.krubom-admin-page .table thead th {
    color: #496680;
    font-size: 0.85rem;
    font-weight: 700;
}

.krubom-admin-page .table tbody tr {
    transition: background 0.18s ease;
}

.krubom-admin-page .table tbody tr:hover {
    background: rgba(255, 255, 255, 0.48);
}

.krubom-admin-page .form-control,
.krubom-admin-page .form-select {
    border-color: rgba(20, 52, 95, 0.14);
    border-radius: 16px;
    background-color: rgba(255, 255, 255, 0.72);
}

.krubom-admin-page .form-control:focus,
.krubom-admin-page .form-select:focus {
    border-color: rgba(111, 92, 255, 0.58);
    box-shadow: 0 0 0 0.22rem rgba(111, 92, 255, 0.12);
}

.krubom-admin-page .btn-primary,
.krubom-admin-page .btn-orange {
    border-radius: 999px;
    box-shadow: 0 14px 30px rgba(20, 52, 95, 0.14);
}

.krubom-admin-page .btn-outline-primary,
.krubom-admin-page .btn-outline-secondary,
.krubom-admin-page .btn-outline-danger {
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.52);
}

.krubom-admin-page .system-thumb {
    border-radius: 18px;
    box-shadow: 0 10px 22px rgba(20, 52, 95, 0.12);
}

.kb-image-preview {
    overflow: hidden;
    min-height: 190px;
    border: 1px solid rgba(255, 255, 255, 0.66);
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.56);
    box-shadow: 0 18px 38px rgba(20, 52, 95, 0.12);
}

.kb-image-preview img {
    display: block;
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.kb-crop-workspace {
    margin-top: 22px;
    padding: 22px;
    border: 1px solid rgba(255, 255, 255, 0.66);
    border-radius: 26px;
    background: rgba(255, 255, 255, 0.58);
    box-shadow: 0 20px 48px rgba(20, 52, 95, 0.12);
    backdrop-filter: blur(18px);
}

.kb-crop-frame {
    min-height: 360px;
    max-height: 560px;
    overflow: hidden;
    border-radius: 22px;
    background: rgba(7, 18, 37, 0.88);
}

.kb-crop-frame img {
    display: block;
    max-width: 100%;
}

.kb-crop-workspace .cropper-container {
    border-radius: 22px;
}

.kb-crop-workspace .crop-aspect.active {
    background: #2563eb;
    color: #fff;
}

.lms-auth-page {
    min-height: 100vh;
    background:
        linear-gradient(rgba(31, 88, 142, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(31, 88, 142, 0.08) 1px, transparent 1px),
        radial-gradient(circle at 18% 12%, rgba(249, 115, 22, 0.18), transparent 26%),
        radial-gradient(circle at 85% 18%, rgba(111, 92, 255, 0.18), transparent 30%),
        #eef5fb;
    background-size: 34px 34px, 34px 34px, auto, auto, auto;
}

.lms-auth-shell {
    max-width: 1180px;
}

.lms-auth-grid,
.lms-register-layout {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(360px, 1.05fr);
    gap: 28px;
    align-items: stretch;
}

.lms-register-layout {
    grid-template-columns: minmax(300px, 0.75fr) minmax(0, 1.25fr);
}

.lms-auth-hero,
.lms-auth-card {
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: 28px;
    background: rgba(255, 255, 255, 0.62);
    box-shadow: 0 24px 60px rgba(20, 52, 95, 0.16);
    backdrop-filter: blur(18px);
}

.lms-auth-hero {
    min-height: 430px;
    padding: 38px;
    color: #071225;
    background:
        linear-gradient(135deg, rgba(7, 18, 37, 0.92), rgba(31, 88, 142, 0.76)),
        url("../uploads/system-menus/6fd441ed-49e0-4e4a-8e41-f71fc96f34b6.jpg");
    background-size: cover;
    background-position: center;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    overflow: hidden;
}

.lms-auth-hero .brand-kicker,
.lms-auth-hero h1,
.lms-auth-hero p {
    color: #fff;
    position: relative;
}

.lms-auth-hero h1 {
    font-size: clamp(2rem, 4vw, 3.6rem);
    line-height: 1.05;
    font-weight: 800;
    margin-bottom: 16px;
}

.lms-auth-hero p {
    max-width: 560px;
    color: rgba(255, 255, 255, 0.82);
    font-size: 1.05rem;
}

.lms-auth-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}

.lms-auth-pills span {
    border: 1px solid rgba(255, 255, 255, 0.36);
    border-radius: 999px;
    padding: 8px 14px;
    color: #fff;
    background: rgba(255, 255, 255, 0.13);
}

.lms-auth-card {
    border-radius: 28px;
}

.lms-register-cta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 16px;
    border-radius: 22px;
    background: linear-gradient(135deg, rgba(219, 234, 254, 0.9), rgba(255, 237, 213, 0.9));
}

.lms-role-choice {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.lms-role-choice .btn {
    border-radius: 18px;
    padding: 14px;
    font-weight: 700;
}

.lms-level-checks {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    padding: 12px;
    border: 1px solid rgba(20, 52, 95, 0.14);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.72);
}

.lms-level-checks .form-check {
    margin: 0;
}

.teacher-profile-card {
    overflow: hidden;
}

.teacher-avatar {
    width: 156px;
    height: 156px;
    object-fit: cover;
    border: 6px solid rgba(255, 255, 255, 0.92);
    border-radius: 999px;
    box-shadow: 0 18px 40px rgba(20, 52, 95, 0.18);
    background: #dbeafe;
}

.teacher-level-checks {
    max-width: 520px;
}

.course-section-picker {
    display: grid;
    gap: 12px;
}

.course-section-group {
    padding: 14px;
    border: 1px solid rgba(20, 52, 95, 0.14);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.72);
}

.section-check {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    min-height: 40px;
    margin: 0;
    padding: 8px 10px;
    border: 1px solid rgba(20, 52, 95, 0.12);
    border-radius: 12px;
    background: rgba(248, 251, 255, 0.78);
    cursor: pointer;
    transition: border-color 0.18s ease, background 0.18s ease, transform 0.18s ease;
}

.section-check:hover {
    border-color: rgba(255, 122, 47, 0.42);
    background: #fff;
    transform: translateY(-1px);
}

.section-check .form-check-input {
    margin: 0;
}

.lesson-attachment-list {
    display: grid;
    gap: 10px;
}

.lesson-attachment-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border: 1px solid rgba(20, 52, 95, 0.12);
    border-radius: 14px;
    background: rgba(248, 251, 255, 0.84);
}

.lesson-attachment-row .form-check-input {
    margin: 0;
}

.lesson-media-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.lesson-media-card {
    overflow: hidden;
    border: 1px solid rgba(20, 52, 95, 0.12);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.78);
    box-shadow: 0 12px 28px rgba(20, 52, 95, 0.08);
}

.lesson-media-card img,
.lesson-file-icon {
    width: 100%;
    height: 160px;
}

.lesson-media-card img {
    display: block;
    object-fit: cover;
}

.lesson-file-icon {
    display: grid;
    place-items: center;
    color: #fff;
    font-weight: 800;
    background: linear-gradient(135deg, var(--kb-blue), var(--kb-purple));
}

.lesson-media-body {
    padding: 14px;
}

@media (max-width: 767.98px) {
    .kb-index {
        padding: 18px;
    }

    .kb-topbar,
    .kb-hero-panel {
        grid-template-columns: 1fr;
    }

    .kb-topbar {
        align-items: flex-start;
    }

    .kb-topbar-actions {
        justify-content: flex-start;
        width: 100%;
    }

    .kb-bento-grid {
        grid-template-columns: 1fr;
        grid-auto-rows: 260px;
    }

    .kb-card-feature,
    .kb-card-wide,
    .kb-card-tall {
        grid-column: span 1;
        grid-row: span 1;
    }

    .kb-hero-panel {
        min-height: auto;
        border-radius: 26px;
    }

    .kb-crop-workspace {
        padding: 16px;
    }

    .kb-crop-frame {
        min-height: 260px;
    }

    .lms-auth-grid,
    .lms-register-layout {
        grid-template-columns: 1fr;
    }

    .lms-auth-hero {
        min-height: 300px;
        padding: 26px;
    }

    .lms-register-cta {
        align-items: stretch;
        flex-direction: column;
    }

    .lms-level-checks {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .lesson-media-grid {
        grid-template-columns: 1fr;
    }
}