/* ============================================================================
   Navigasi samping mahasiswa
   ----------------------------------------------------------------------------
   Rail ini adalah navigasi utama mahasiswa setelah login. Bentuknya flat:
   tanpa kaca, gradien, atau bayangan. Hierarki dibangun dari posisi, bobot
   teks, satu tint aksen untuk state aktif, dan garis pemandu tipis pada
   submenu Teori. Menu utama di top nav disembunyikan saat rail ini aktif,
   jadi tidak ada dua navigasi yang menunjuk tujuan yang sama.

   Desktop  : rail vertikal sticky di kiri, konten di kanan.
   <=1100px : rail menjadi strip horizontal sticky di bawah topbar; submenu
              Teori muncul sebagai panel datar di bawah tombolnya.
   ========================================================================== */

body.student-nav .top-nav #app-nav-tabs,
body.student-nav .top-nav #nav-tabs-divider {
    display: none !important;
}

/* ============================================================================
   DESKTOP VIEW (>= 1101px): Rail vertikal kiri (250px), konten di kanan
   ============================================================================ */
@media (min-width: 1101px) {
    body.student-nav:has(#student-rail) .app-layout {
        display: grid !important;
        grid-template-columns: 250px minmax(0, 1fr) !important;
        grid-template-rows: 64px minmax(0, 1fr) auto !important;
        column-gap: 0 !important;
        row-gap: 0 !important;
        align-items: stretch;
        padding-left: 0 !important;
        padding-right: 0 !important;
        margin: 0 !important;
        width: 100% !important;
        max-width: 100% !important;
    }

    body.student-nav .top-nav {
        grid-column: 1 / -1;
        grid-row: 1;
        width: 100%;
        padding-left: 20px !important;
        padding-right: 20px !important;
    }

    body.student-nav .student-rail,
    .student-rail {
        grid-column: 1 !important;
        grid-row: 2 !important;
        align-self: stretch;
        position: sticky;
        top: 64px;
        height: calc(100vh - 64px);
        min-height: calc(100vh - 64px);
        max-height: calc(100vh - 64px);
        width: 250px !important;
        min-width: 250px !important;
        max-width: 250px !important;
        box-sizing: border-box;
        margin: 0 !important;
        border-radius: 0 !important;
        border: none !important;
        border-right: 1px solid rgba(255, 255, 255, 0.15) !important;
        box-shadow: none !important;
        overflow-y: auto;
        overflow-x: hidden;
        scrollbar-width: none;
        -ms-overflow-style: none;
        padding: 16px 14px;
        background: #12544F !important;
    }

    [data-theme="dark"] body.student-nav .student-rail,
    [data-theme="dark"] .student-rail {
        background: #000000 !important;
        background-color: #000000 !important;
        border-right: 1px solid rgba(255, 255, 255, 0.22) !important;
    }

    body.student-nav .content-area {
        grid-column: 2 !important;
        grid-row: 2 !important;
        min-width: 0;
        min-height: 0;
        width: 100%;
        align-self: stretch;
        box-sizing: border-box;
        padding: 24px clamp(16px, 2.5vw, 32px);
    }

    body.student-nav .app-footer {
        grid-column: 1 / -1;
        grid-row: 3;
    }
}

.student-rail {
    box-sizing: border-box;
    min-width: 0;
}

.student-rail::-webkit-scrollbar {
    display: none;
    width: 0;
    height: 0;
}

.student-rail.hidden {
    display: none !important;
}

/* Skeleton Loading State untuk Rail */
.student-rail-skeleton {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
}

.student-rail-skeleton.hidden {
    display: none !important;
}

.student-rail-content.hidden {
    display: none !important;
}

.student-rail-skeleton .skeleton-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 2px 4px 14px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 4px;
}

.student-rail-skeleton .skeleton-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    flex-shrink: 0;
}

.student-rail-skeleton .skeleton-title {
    width: 110px;
    height: 14px;
    border-radius: 4px;
}

.student-rail-skeleton .skeleton-eyebrow {
    width: 78px;
    height: 10px;
    border-radius: 4px;
    margin: 4px 0 6px;
}

.student-rail-skeleton .skeleton-link {
    width: 100%;
    height: 38px;
    border-radius: 8px;
}

.student-rail-skeleton .skeleton-shimmer,
.skeleton-shimmer {
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.04) 25%,
        rgba(255, 255, 255, 0.10) 50%,
        rgba(255, 255, 255, 0.04) 75%
    );
    background-size: 200% 100%;
    animation: rail-skeleton-shimmer 1.4s ease-in-out infinite;
}

@keyframes rail-skeleton-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.student-rail-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 2px 4px 14px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 8px;
}

.student-rail-brand-logo-wrap {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: #141416;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.student-rail-brand-logo-wrap i {
    font-size: 20px;
    color: #ffffff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.student-rail-brand-logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.student-rail-brand-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
    flex: 1;
}

.student-rail-brand-title {
    font-size: 14px;
    font-weight: 600;
    color: #ffffff;
    line-height: 1.25;
    white-space: nowrap;
}

.student-rail-brand-title-bold {
    font-weight: 700;
    color: #ffffff;
}

.student-rail-brand-subtitle {
    font-size: 11px;
    color: #a1a1aa;
    line-height: 1.3;
    white-space: nowrap;
}

.student-rail-eyebrow {
    margin: 12px 0 4px;
    padding: 0 8px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #71717a;
    line-height: 1.2;
}

.student-rail-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 100%;
}

.student-rail-nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
    flex: 1 1 auto;
}

/* Footer Sidebar Mahasiswa (Profil Pengguna di Bawah) */
.student-rail-footer {
    margin-top: auto;
    padding-top: 14px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    flex-shrink: 0;
}

.student-rail-user-card {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 8px 10px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.12);
    cursor: pointer;
    text-align: left;
    box-sizing: border-box;
    transition: background 150ms ease, border-color 150ms ease;
    color: inherit;
    font-family: inherit;
}

.student-rail-user-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.22);
}

.student-rail-user-card.is-active,
.student-rail-user-card:focus-visible {
    background: rgba(16, 185, 129, 0.16);
    border-color: rgba(16, 185, 129, 0.45);
}

.student-rail-user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: #134e48;
    border: 1px solid rgba(20, 184, 166, 0.45);
    color: #ffffff;
    font-size: 15px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.student-rail-user-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
    flex: 1;
    gap: 2px;
}

.student-rail-user-name {
    font-size: 13px;
    font-weight: 700;
    color: #ffffff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.25;
}

.student-rail-user-meta {
    font-size: 11px;
    color: #a1a1aa;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.2;
}

.student-rail-user-arrow {
    font-size: 18px;
    color: #a1a1aa;
    margin-left: auto;
    flex-shrink: 0;
}

.student-rail-link,
.student-rail-sublink {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 10px;
    width: 100%;
    min-width: 0;
    min-height: 38px;
    height: 38px;
    margin: 0;
    padding: 0 10px;
    border: 1px solid transparent !important;
    border-radius: 8px;
    background: transparent !important;
    box-shadow: none !important;
    color: #d4d4d8 !important;
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 500;
    line-height: 1.3;
    text-align: left;
    text-decoration: none;
    cursor: pointer;
    box-sizing: border-box;
    transform: none !important;
    transition: background var(--transition-fast), color var(--transition-fast);
}

/* Pill button global memakai ::before/::after; rail sengaja datar. */
.student-rail-link::before,
.student-rail-link::after,
.student-rail-sublink::before,
.student-rail-sublink::after {
    display: none !important;
}

.student-rail-brand-logo-wrap i,
.student-rail-link i,
.student-rail-sublink i {
    font-family: 'Material Symbols Outlined' !important;
    font-style: normal !important;
    font-feature-settings: 'liga' 1 !important;
    letter-spacing: normal !important;
    flex: 0 0 20px !important;
    width: 20px !important;
    max-width: 20px !important;
    height: 20px !important;
    font-size: 19px !important;
    line-height: 1 !important;
    overflow: hidden !important;
    text-overflow: clip !important;
    white-space: nowrap !important;
    text-align: center;
    color: #ffffff !important;
    contain: layout paint size;
}

.student-rail-link > span:not(.student-rail-badge) {
    min-width: 0;
    overflow-wrap: anywhere;
}

.student-rail-link:hover,
.student-rail-sublink:hover {
    background: rgba(255, 255, 255, 0.08) !important;
    color: #ffffff !important;
}

.student-rail-link.is-active,
.student-rail-sublink.is-active {
    background: #ffffff !important;
    color: #000000 !important;
    border-color: #ffffff !important;
    font-weight: 700 !important;
}

.student-rail-link.is-active i,
.student-rail-sublink.is-active i {
    color: #000000 !important;
}

.student-rail-link.is-active span,
.student-rail-sublink.is-active span {
    color: #000000 !important;
}

.student-rail-link:focus-visible,
.student-rail-sublink:focus-visible {
    outline: 2px solid #ffffff;
    outline-offset: 2px;
}

.student-rail-caret {
    flex: 0 0 auto !important;
    width: auto !important;
    margin-left: auto;
    font-size: 18px !important;
    color: #71717a !important;
    transition: transform var(--transition-fast), color var(--transition-fast);
}

.student-rail-link:hover .student-rail-caret {
    color: #ffffff !important;
}

.student-rail-toggle[aria-expanded="true"] .student-rail-caret {
    transform: rotate(180deg);
}

.student-rail-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.student-rail-sub {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin: 2px 0 4px 18px;
    padding-left: 10px;
    border-left: 1px solid rgba(255, 255, 255, 0.15) !important;
}

.student-rail-sub.hidden {
    display: none !important;
}

.student-rail-sublink {
    min-height: 34px;
    height: 34px;
    padding: 0 8px;
    border-radius: 6px;
    font-size: 12.5px;
    font-weight: 500;
    color: #a1a1aa !important;
}

.student-rail-sublink:hover {
    color: #ffffff !important;
}

.student-rail-badge {
    flex: 0 0 auto;
    margin-left: auto;
    font: 600 11px/1 var(--font-mono);
    font-variant-numeric: tabular-nums;
    color: var(--text-tertiary);
}

.student-rail-link.is-active .student-rail-badge {
    color: #000000 !important;
}

.student-rail-badge.hidden {
    display: none !important;
}

/* ---------- Tablet, Mobile & Webview (<= 1100px): Rail Horizontal Seragam ---------- */
@media (max-width: 1100px) {
    body.student-nav:has(#student-rail) .app-layout {
        display: grid !important;
        grid-template-columns: 100% !important;
        grid-template-rows: 64px auto minmax(0, 1fr) auto !important;
        column-gap: 0 !important;
        row-gap: 0 !important;
        align-items: stretch !important;
        padding-left: 0 !important;
        padding-right: 0 !important;
        margin: 0 !important;
        width: 100% !important;
        max-width: 100% !important;
    }

    body.student-nav .top-nav {
        grid-column: 1 / -1 !important;
        grid-row: 1 !important;
        width: 100% !important;
        padding-left: clamp(12px, 3vw, 20px) !important;
        padding-right: clamp(12px, 3vw, 20px) !important;
    }

    body.student-nav .student-rail,
    .student-rail {
        grid-column: 1 / -1 !important;
        grid-row: 2 !important;
        position: sticky !important;
        top: 64px !important;
        z-index: 50 !important;
        width: 100% !important;
        min-width: 100% !important;
        max-width: 100% !important;
        height: auto !important;
        min-height: auto !important;
        max-height: none !important;
        border-radius: 0 !important;
        border: none !important;
        border-bottom: 1px solid rgba(255, 255, 255, 0.14) !important;
        padding: 8px 12px !important;
        margin: 0 !important;
        overflow-x: auto !important;
        overflow-y: hidden !important;
        -webkit-overflow-scrolling: touch !important;
        scrollbar-width: none !important;
        -ms-overflow-style: none !important;
        box-sizing: border-box !important;
        background: #12544F !important;
        backdrop-filter: blur(16px) saturate(160%) !important;
        -webkit-backdrop-filter: blur(16px) saturate(160%) !important;
    }

    .student-rail::-webkit-scrollbar {
        display: none !important;
        width: 0 !important;
        height: 0 !important;
    }

    [data-theme="dark"] body.student-nav .student-rail,
[data-theme="dark"] .student-rail {
    background: #000000 !important;
    border-right-color: rgba(255, 255, 255, 0.25) !important;
    border-bottom-color: rgba(255, 255, 255, 0.25) !important;
}

    body.student-nav .content-area {
        grid-column: 1 / -1 !important;
        grid-row: 3 !important;
        width: 100% !important;
        max-width: 100% !important;
        min-width: 0 !important;
        padding: 16px clamp(12px, 2.5vw, 20px) !important;
        box-sizing: border-box !important;
    }

    body.student-nav .app-footer {
        grid-column: 1 / -1 !important;
        grid-row: 4 !important;
        width: 100% !important;
    }

    .student-rail-brand,
    .student-rail-eyebrow,
    .student-rail-skeleton .skeleton-header,
    .student-rail-skeleton .skeleton-eyebrow {
        display: none !important;
    }

    .student-rail-content {
        display: block !important;
        width: 100% !important;
        min-width: 0 !important;
        overflow-x: auto !important;
        -webkit-overflow-scrolling: touch !important;
        scrollbar-width: none !important;
    }
    .student-rail-content::-webkit-scrollbar {
        display: none !important;
    }

    .student-rail-nav,
    .student-rail-skeleton {
        display: flex !important;
        flex-direction: row !important;
        flex-wrap: nowrap !important;
        align-items: center !important;
        gap: 8px !important;
        width: max-content !important;
        min-width: 100% !important;
        padding: 2px 0 !important;
        margin: 0 !important;
    }

    .student-rail-link {
        width: auto !important;
        flex: 0 0 auto !important;
        flex-shrink: 0 !important;
        padding: 6px 14px !important;
        min-height: 36px !important;
        height: 36px !important;
        white-space: nowrap !important;
        font-size: 13px !important;
        border-radius: 6px !important;
        box-sizing: border-box !important;
    }

    .student-rail-group {
        position: relative !important;
        display: flex !important;
        flex-direction: row !important;
        flex-wrap: nowrap !important;
        align-items: center !important;
        gap: 4px !important;
        flex: 0 0 auto !important;
    }

    .student-rail-sub {
        position: absolute !important;
        top: calc(100% + 6px) !important;
        left: 0 !important;
        z-index: 55 !important;
        min-width: 148px !important;
        margin: 0 !important;
        padding: 4px !important;
        border: 1px solid rgba(255, 255, 255, 0.15) !important;
        border-radius: 8px !important;
        background: #111111 !important;
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4) !important;
    }

    [data-theme="light"] .student-rail-sub {
        background: #0f4440 !important;
        border: 1px solid rgba(255, 255, 255, 0.2) !important;
    }

    .student-rail-sublink {
        width: 100% !important;
        padding: 6px 12px !important;
        white-space: nowrap !important;
    }
}

@media (max-width: 720px) {
    body.student-nav:has(#student-rail) .app-layout {
        grid-template-rows: 60px auto minmax(0, 1fr) auto !important;
    }

    body.student-nav .student-rail,
    .student-rail {
        top: 60px !important;
        padding: 6px 10px !important;
    }

    .student-rail-link {
        font-size: 12.5px !important;
        padding: 5px 12px !important;
        min-height: 34px !important;
        height: 34px !important;
    }
}

@media (max-width: 400px) {
    body.student-nav:has(#student-rail) .app-layout {
        grid-template-rows: 54px auto minmax(0, 1fr) auto !important;
    }

    body.student-nav .student-rail,
    .student-rail {
        top: 54px !important;
        padding: 5px 8px !important;
    }

    .student-rail-link {
        font-size: 12px !important;
        padding: 4px 10px !important;
        min-height: 32px !important;
        height: 32px !important;
        gap: 6px !important;
    }
}

@media (prefers-reduced-motion: reduce) {
    .student-rail-caret {
        transition: none;
    }
}

/* ============================================================================
   STUDENT RAIL THEME COMPLIANCE (Warna Seragam Emerald #12544F)
   ============================================================================ */
body.student-nav .student-rail,
.student-rail,
[data-theme="light"] body.student-nav .student-rail,
[data-theme="light"] .student-rail {
    background: #12544F !important;
    border: none !important;
    border-right: 1px solid rgba(255, 255, 255, 0.14) !important;
    border-radius: 0 !important;
    box-shadow: none !important;
}

body.student-nav .student-rail-brand,
.student-rail-brand,
[data-theme="light"] .student-rail-brand {
    border-bottom: 1px solid rgba(255, 255, 255, 0.14) !important;
}

body.student-nav .student-rail-brand-logo-wrap,
.student-rail-brand-logo-wrap,
[data-theme="light"] .student-rail-brand-logo-wrap {
    background: rgba(255, 255, 255, 0.14) !important;
    border: 1px solid rgba(255, 255, 255, 0.25) !important;
}

body.student-nav .student-rail-brand-logo-wrap i,
.student-rail-brand-logo-wrap i,
body.student-nav .student-rail-brand-title,
.student-rail-brand-title,
body.student-nav .student-rail-brand-title-bold,
.student-rail-brand-title-bold,
body.student-nav .student-rail-link,
.student-rail-link,
body.student-nav .student-rail-link i,
.student-rail-link i,
body.student-nav .student-rail-link span,
.student-rail-link span,
body.student-nav .student-rail-sublink,
.student-rail-sublink,
body.student-nav .student-rail-sublink i,
.student-rail-sublink i,
body.student-nav .student-rail-sublink span,
.student-rail-sublink span,
[data-theme="light"] .student-rail-brand-logo-wrap i,
[data-theme="light"] .student-rail-brand-title,
[data-theme="light"] .student-rail-brand-title-bold,
[data-theme="light"] .student-rail-link,
[data-theme="light"] .student-rail-link i,
[data-theme="light"] .student-rail-link span,
[data-theme="light"] .student-rail-sublink,
[data-theme="light"] .student-rail-sublink i,
[data-theme="light"] .student-rail-sublink span {
    color: #ffffff !important;
}

body.student-nav .student-rail-brand-subtitle,
.student-rail-brand-subtitle,
body.student-nav .student-rail-eyebrow,
.student-rail-eyebrow,
[data-theme="light"] .student-rail-brand-subtitle,
[data-theme="light"] .student-rail-eyebrow {
    color: rgba(255, 255, 255, 0.75) !important;
}

body.student-nav .student-rail-link:hover,
.student-rail-link:hover,
body.student-nav .student-rail-sublink:hover,
.student-rail-sublink:hover,
[data-theme="light"] .student-rail-link:hover,
[data-theme="light"] .student-rail-sublink:hover {
    background: rgba(255, 255, 255, 0.14) !important;
    color: #ffffff !important;
}

body.student-nav .student-rail-link.is-active,
.student-rail-link.is-active,
body.student-nav .student-rail-sublink.is-active,
.student-rail-sublink.is-active,
[data-theme="light"] .student-rail-link.is-active,
[data-theme="light"] .student-rail-sublink.is-active {
    background: #ffffff !important;
    color: #12544F !important;
    border-color: #ffffff !important;
    font-weight: 700 !important;
}

body.student-nav .student-rail-link.is-active i,
.student-rail-link.is-active i,
body.student-nav .student-rail-link.is-active span,
.student-rail-link.is-active span,
body.student-nav .student-rail-sublink.is-active i,
.student-rail-sublink.is-active i,
body.student-nav .student-rail-sublink.is-active span,
.student-rail-sublink.is-active span,
[data-theme="light"] .student-rail-link.is-active i,
[data-theme="light"] .student-rail-sublink.is-active i,
[data-theme="light"] .student-rail-link.is-active span,
[data-theme="light"] .student-rail-sublink.is-active span {
    color: #12544F !important;
}

body.student-nav .student-rail-link.is-active .student-rail-badge,
.student-rail-link.is-active .student-rail-badge,
[data-theme="light"] .student-rail-link.is-active .student-rail-badge {
    color: #12544F !important;
}

body.student-nav .student-rail-sub,
.student-rail-sub,
[data-theme="light"] .student-rail-sub {
    border-left: 1px solid rgba(255, 255, 255, 0.25) !important;
}

body.student-nav .student-rail-caret,
.student-rail-caret,
[data-theme="light"] .student-rail-caret {
    color: rgba(255, 255, 255, 0.75) !important;
}

body.student-nav .student-rail-link:hover .student-rail-caret,
.student-rail-link:hover .student-rail-caret,
[data-theme="light"] .student-rail-link:hover .student-rail-caret {
    color: #ffffff !important;
}