/* Core styles, variables and common components */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --glass-bg: rgba(255, 255, 255, 0.92);
    --glass-border: rgba(200, 210, 225, 0.5);
    --glass-shadow: rgba(0, 0, 0, 0.04);
    --body-bg: #f9fafb;
    --text-color: #334155;
    --nav-text: #0f172a;
}

[data-bs-theme="dark"] {
    --glass-bg: rgba(22, 24, 29, 0.75);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-shadow: rgba(0, 0, 0, 0.2);
    --body-bg: #0b0d11;
    --text-color: #e2e8f0;
    --nav-text: #f7fafc;
}

body {
    background-color: var(--body-bg);
    color: var(--text-color);
    transition: background-color 0.4s cubic-bezier(0.4, 0, 0.2, 1), color 0.4s ease;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    min-width: 320px;
    overflow-x: hidden;
    /* Prevent iOS auto-zoom on input focus by ensuring at least 16px font size */
    -webkit-text-size-adjust: 100%;
}

/* Prevent auto-zoom on iOS Safari (requires font-size >= 16px) */
input[type="text"],
input[type="number"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="tel"],
input[type="url"],
textarea,
select {
    font-size: 16px !important;
}

@media (min-width: 768px) {
    /* Optionally reset to a smaller font size on larger screens if needed, 
       but 16px is generally good for accessibility. */
    input[type="text"],
    input[type="number"],
    input[type="email"],
    input[type="password"],
    input[type="search"],
    input[type="tel"],
    input[type="url"],
    textarea,
    select {
        font-size: 0.9rem !important; /* Standard Bootstrap/Dashboard size */
    }
}

/* Navbar */
.navbar {
    background: transparent !important;
    border-bottom: 0;
    padding: 0.75rem 0;
    transition: padding 0.25s ease;
}

.navbar-shell {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.62), rgba(255, 255, 255, 0.48));
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    box-shadow: 0 10px 28px var(--glass-shadow);
    padding: 0.42rem 0.9rem;
}

[data-bs-theme="dark"] .navbar-shell {
    background: linear-gradient(145deg, rgba(18, 20, 25, 0.88), rgba(12, 14, 20, 0.76));
}

.navbar-nav .nav-link,
.navbar-nav .nav-item {
    color: var(--nav-text) !important;
    font-weight: 500;
}

.navbar-brand {
    font-weight: 800;
    letter-spacing: -0.5px;
    font-size: 1.4rem;
}

.brand-mark {
    background: linear-gradient(135deg, #ff9900, #ff5500);
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 0.78rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 20px rgba(255, 123, 0, 0.28);
}

.brand-text {
    background: linear-gradient(135deg, #ff9900, #ff5500);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Common Components */
.card {
    background-color: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: 0 10px 40px var(--glass-shadow);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s ease;
    overflow: hidden; /* Fixes sharp corners on headers */
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 60px var(--glass-shadow);
}

/* Pro Feature Lock Styles */
.pro-feature-locked {
    position: relative;
    user-select: none;
}

.pro-feature-locked textarea,
.pro-feature-locked input {
    filter: blur(3px);
    opacity: 0.6;
    pointer-events: none;
    background-color: rgba(0, 0, 0, 0.05) !important;
}

.pro-lock-badge {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
    pointer-events: all;
}

.btn {
    border-radius: 12px;
    font-weight: 600;
    padding: 0.6rem 1.2rem;
    transition: all 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #007aff, #0056b3);
    border: none;
    box-shadow: 0 4px 14px rgba(0, 122, 255, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #0066d6, #004099);
    transform: scale(1.03);
    box-shadow: 0 6px 20px rgba(0, 122, 255, 0.4);
}

/* Theme Toggle */
.theme-btn {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--nav-text);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.theme-btn:hover {
    background: var(--glass-border);
    transform: rotate(15deg);
}

#theme-icon.bi-sun-fill {
    color: #FFD43B;
}

#theme-icon.bi-moon-stars-fill {
    color: #4C6EF5;
}

/* Language Switcher */
.language-switcher-form {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    border-radius: 999px;
    border: 1px solid var(--glass-border);
    background: transparent;
    padding: 0.16rem 0.5rem;
}

.language-switcher-icon {
    display: inline-block;
    font-size: 0.86rem;
    opacity: 0.85;
}

.language-switcher {
    width: 4.9rem;
    min-width: 4.9rem;
    border: 0;
    background-color: transparent;
    color: var(--nav-text);
    font-size: 0.8rem;
    font-weight: 600;
    text-align: center;
    text-align-last: center;
    letter-spacing: 0.04em;
    padding: 0.22rem 0.95rem 0.22rem 0.1rem;
    line-height: 1.2;
    background-position: right 0.12rem center;
    background-size: 0.75rem;
}

.language-switcher:focus {
    box-shadow: none;
    outline: none;
}

.language-switcher-form:focus-within {
    border-color: rgba(var(--bs-primary-rgb), 0.45);
    box-shadow: 0 0 0 0.15rem rgba(var(--bs-primary-rgb), 0.2);
}

/* Modals & Glass Components */
.glass-modal-content {
    background: var(--glass-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--glass-border) !important;
    border-radius: 1.2rem !important;
    box-shadow: 0 15px 45px var(--glass-shadow);
}

/* Modal Top: Positions modals near the top of the screen */
.modal-top .modal-dialog {
    margin-top: 1rem !important;
    margin-bottom: 1rem !important;
}

/* Ensure scrollable modals fit exactly within the viewport to prevent the modal container itself from scrolling */
.modal-top .modal-dialog-scrollable {
    max-height: calc(100% - 4rem) !important;
}

@media (min-width: 992px) {
    .modal-top .modal-dialog {
        margin-top: 2.5rem !important;
        margin-bottom: 2.5rem !important;
    }

    .modal-top .modal-dialog-scrollable {
        max-height: calc(100% - 7rem) !important;
    }
}

.practice-mode-active .modal-backdrop.show {
    opacity: 0.85 !important;
    background-color: #000;
}

.modal-header-sticky {
    position: sticky;
    top: 0;
    z-index: 1020;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

[data-bs-theme="dark"] .glass-modal-content {
    background: rgba(22, 26, 34, 0.88);
}

.modal-header {
    border-bottom: 1px solid var(--glass-border);
    padding: 1.25rem 1.5rem;
}

.modal-footer {
    border-top: 1px solid var(--glass-border);
    padding: 1.25rem 1.5rem;
}

/* User Menu */
.user-menu-trigger {
    background: rgba(var(--bs-primary-rgb), 0.12);
    border: 1px solid rgba(var(--bs-primary-rgb), 0.2);
}

.user-menu-trigger:hover,
.user-menu-trigger:focus {
    background: rgba(var(--bs-primary-rgb), 0.18);
    border-color: rgba(var(--bs-primary-rgb), 0.35);
}

.user-menu-panel {
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 0.9rem;
}

[data-bs-theme="dark"] .user-menu-panel {
    background: rgba(18, 20, 25, 0.96);
}

/* Tables */
.table {
    color: var(--text-color);
    --bs-table-border-color: var(--glass-border);
}

.table-light {
    --bs-table-bg: transparent;
    --bs-table-color: var(--text-color);
}

/* Collections Panel (Dashboard Index) */
.collections-panel-header {
    border-bottom: 1px solid var(--glass-border);
    background: linear-gradient(120deg, rgba(var(--bs-primary-rgb), 0.1), transparent) !important;
}

.collections-panel-title {
    color: var(--text-color);
    font-size: 1.02rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.collections-panel-table thead th {
    border-top: 0;
    border-bottom: 1px solid var(--glass-border);
    background-color: transparent;
    color: var(--text-color);
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 1rem;
}

[data-bs-theme="dark"] .collections-panel-table {
    --bs-table-bg: transparent;
    --bs-table-striped-bg: transparent;
    --bs-table-hover-bg: transparent;
}

[data-bs-theme="dark"] .collections-panel-table > :not(caption) > * > * {
    background-color: transparent;
}

.collections-panel-table tbody td {
    padding: 0.9rem 1rem;
}

.collections-panel-table tbody tr {
    transition: background-color 0.2s ease;
}

.collections-panel-table tbody tr:hover {
    background-color: rgba(var(--bs-primary-rgb), 0.04);
}

[data-bs-theme="light"] .collections-panel {
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid rgba(15, 23, 42, 0.08);
    box-shadow: 0 14px 34px rgba(15, 23, 42, 0.08);
}

[data-bs-theme="light"] .collections-panel-header {
    border-bottom-color: rgba(15, 23, 42, 0.1);
    background: linear-gradient(120deg, rgba(var(--bs-primary-rgb), 0.12), rgba(var(--bs-primary-rgb), 0.03)) !important;
}

[data-bs-theme="light"] .collections-panel-table thead th {
    color: #334155;
    border-bottom-color: rgba(15, 23, 42, 0.14);
}

[data-bs-theme="light"] .collections-panel-table tbody td {
    border-bottom-color: rgba(15, 23, 42, 0.14);
}

[data-bs-theme="light"] .collections-panel-table tbody tr:hover {
    background-color: rgba(var(--bs-primary-rgb), 0.065);
}

.collections-action-btn {
    border-color: var(--glass-border);
    color: var(--text-color);
    padding: 0.4rem 0.9rem;
}

.collections-action-btn:hover,
.collections-action-btn:focus {
    border-color: rgba(var(--bs-primary-rgb), 0.45);
    background-color: rgba(var(--bs-primary-rgb), 0.08);
    color: var(--text-color);
}

[data-bs-theme="light"] .collections-action-btn {
    border-color: rgba(15, 23, 42, 0.16);
    color: #1f2937;
}

[data-bs-theme="light"] .collections-action-btn:hover,
[data-bs-theme="light"] .collections-action-btn:focus {
    border-color: rgba(var(--bs-primary-rgb), 0.4);
    background-color: rgba(var(--bs-primary-rgb), 0.12);
    color: #0b1220;
}

/* Footer */
.app-footer {
    margin-top: auto;
}

.app-footer a {
    display: inline-flex;
    align-items: center;
}

.footer-title {
    font-size: 0.7rem;
    letter-spacing: 0.05em;
    opacity: 0.8;
}

.footer-link-list {
    font-size: 0.85rem;
}

.footer-copyright {
    font-size: 0.75rem;
}

.brand-sig-text {
    font-size: 0.85rem;
}

.brand-sig-icon {
    width: 20px;
    height: 20px;
    border-radius: 6px;
    box-shadow: none !important;
}

.brand-sig-icon i {
    font-size: 0.65rem;
}

/* Utilities */
.text-body {
    color: var(--text-color) !important;
}

.bg-transparent {
    background-color: transparent !important;
}

.badge-chip {
    display: inline-flex;
    align-items: center;
    line-height: 1;
    padding: 0.42em 0.7em;
    margin-bottom: 0.2rem !important;
}

.telegram-linked-handle-full {
    display: inline-block;
    overflow-wrap: anywhere;
    word-break: break-word;
    line-height: 1.2;
}

/* --- Media Queries --- */

@media (max-width: 991.98px) {
    .navbar-shell {
        border-radius: 0.82rem;
        padding: 0.35rem 0.68rem;
    }

    .navbar-collapse {
        padding-top: 0.6rem;
    }

    .navbar-collapse .navbar-nav {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: space-around;
        align-items: center !important;
        gap: 0.55rem !important;
    }

    .navbar-collapse .nav-item {
        width: auto;
    }

    .navbar-collapse .theme-toggle-item {
        display: flex;
        justify-content: center;
    }

    .navbar-collapse .theme-toggle-item .theme-btn {
        width: 40px;
        height: 40px;
        border-radius: 50%;
    }

    .navbar-collapse .language-switcher-form {
        width: auto;
        justify-content: center;
    }

    .navbar-collapse .user-menu-trigger {
        display: flex;
        justify-content: center;
        max-width: min(100%, 15rem);
        white-space: nowrap;
    }

    .navbar-collapse .nav-item.dropdown .dropdown-menu {
        position: absolute;
        right: 0;
        left: auto;
        z-index: 1050;
        min-width: 10.5rem;
        max-width: min(14rem, calc(100vw - 2rem));
    }

    .navbar-collapse .user-menu-trigger .fw-semibold {
        display: inline-block;
        max-width: 9.5rem;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .navbar-collapse .mobile-fullwidth-action {
        width: 100%;
    }

    .navbar-collapse .mobile-fullwidth-action > .btn {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 575.98px) {
    .dashboard-index-topbar {
        flex-direction: column !important;
        align-items: stretch !important;
    }

    .dashboard-top-actions {
        flex-direction: column !important;
        width: 100%;
        justify-content: stretch !important;
    }

    .dashboard-top-actions .btn {
        width: 100% !important;
    }
}

@media (max-width: 767.98px) {
    .collections-panel-title {
        font-size: 0.95rem;
    }

    .collections-panel .card-body {
        padding: 0.8rem;
    }

    .collections-panel-table thead {
        display: none;
    }

    .collections-panel-table,
    .collections-panel-table tbody,
    .collections-panel-table tr,
    .collections-panel-table td {
        display: block;
        width: 100%;
    }

    .collections-panel-table tbody tr {
        border: 1px solid var(--glass-border);
        border-radius: 0.75rem;
        padding: 1.25rem;
        margin-bottom: 1rem;
        background: rgba(var(--bs-primary-rgb), 0.02);
        display: flex;
        flex-direction: column;
        align-items: stretch;
        text-align: left;
        gap: 0.85rem;
    }

    .collections-panel-table tbody td {
        border: 0 !important;
        padding: 0 !important;
        text-align: left !important;
        line-height: 1.4;
        background: transparent !important;
        width: 100%;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    /* Mobile labels using data attributes */
    .collections-panel-table tbody td[data-label]::before {
        content: attr(data-label);
        font-size: 0.75rem;
        font-weight: 700;
        text-transform: uppercase;
        color: var(--text-color);
        opacity: 0.5;
        margin-right: 1rem;
    }

    .collections-panel-table tbody td:nth-child(1) {
        justify-content: center;
        font-size: 1.15rem;
        border-bottom: 1px solid var(--glass-border) !important;
        padding-bottom: 0.75rem !important;
        margin-bottom: 0.4rem;
    }
    .collections-panel-table tbody td:nth-child(1)::before { display: none; }

    /* Keep the mastery bar compact even when the row stacks on smaller screens */
    .collections-panel-table tbody td[data-label="Mastery"] .progress {
        width: 72px !important;
        max-width: 72px !important;
        flex: 0 0 72px;
    }

    .collections-panel-table tbody td[data-label="Mastery"] {
        column-gap: 0.5rem;
    }

    .collections-panel-table tbody td[data-label="Mastery"] > .d-flex {
        width: auto !important;
        margin-left: auto;
        justify-content: flex-end !important;
        flex: 0 0 auto;
    }

    .collections-panel-table tbody td[data-label="Mastery"] .text-nowrap {
        white-space: nowrap;
        flex-shrink: 0;
    }

    .collections-panel-table tbody td:last-child {
        justify-content: center;
        margin-top: 0.6rem;
        padding-top: 1rem !important;
        border-top: 1px solid var(--glass-border) !important;
    }
    .collections-panel-table tbody td:last-child::before { display: none; }

    .collections-panel-table tbody td:last-child .btn {
        width: 100%;
        max-width: none;
    }

    .collections-action-btn {
        width: 100%;
    }
}

@media (max-width: 575.98px) {
    .dashboard-index-topbar {
        flex-direction: column !important;
        align-items: stretch !important;
    }

    .dashboard-top-actions {
        flex-direction: column !important;
        width: 100%;
        justify-content: stretch !important;
    }

    .dashboard-top-actions .btn {
        width: 100% !important;
    }

    .modal-footer {
        flex-direction: column-reverse;
        align-items: stretch;
        gap: 0.5rem;
        padding-bottom: max(1.25rem, env(safe-area-inset-bottom));
    }

    .modal-footer .btn,
    .modal-footer form {
        width: 100%;
    }

    .modal-footer form .btn {
        width: 100%;
    }
}

/* Custom Export Modal Theme Buttons */
.btn-outline-indigo {
    color: #818cf8;
    border-color: #475569; /* Slate 600 - visible in dark mode */
}

.btn-outline-indigo:hover, .btn-check:checked + .btn-outline-indigo {
    background-color: #4f46e5;
    border-color: #4f46e5;
    color: white;
    box-shadow: 0 0 10px rgba(79, 70, 229, 0.4);
}

.btn-outline-info.border-2:hover, .btn-check:checked + .btn-outline-info {
    box-shadow: 0 0 10px rgba(13, 202, 240, 0.3);
}

.z-index-2000 {
    z-index: 2000 !important;
}

#toastContainer {
    z-index: 9999 !important;
    pointer-events: none;
}
#toastContainer .toast {
    pointer-events: auto;
    margin-bottom: 0.75rem;
}

.v-hidden {
    visibility: hidden !important;
}

.min-vh-70 {
    min-height: 70vh !important;
}

.progress-mastery-wrap {
    height: 6px;
    max-width: 100px;
}

/* FOUC Protection for initial state */
.js-upload-tab-text #file-upload { display: none !important; }
.js-upload-tab-text #text-paste { display: block !important; opacity: 1 !important; }
.js-upload-tab-text #file-tab {
    background-color: transparent !important;
    color: var(--bs-nav-pills-link-active-color) !important;
}
.js-upload-tab-text #text-tab {
    background-color: var(--bs-nav-pills-link-active-bg) !important;
    color: var(--bs-nav-pills-link-active-color) !important;
}

/* Checkbox Alignment & Interaction */
.cursor-pointer {
    cursor: pointer !important;
}

.form-check-input.cursor-pointer,
.form-check-label.cursor-pointer {
    cursor: pointer;
}

.align-checkbox-text {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.align-checkbox-text .form-check-input {
    margin-top: 0;
    flex-shrink: 0;
}


/* Interactive & Utility Helpers */
.border-dashed {
    border-style: dashed !important;
}

.text-break-word {
    overflow-wrap: break-word !important;
    word-break: break-word !important; /* Non-standard but effective in some browsers */
    hyphens: auto;
}

.copyable-text {
    border-bottom: 1px dashed rgba(var(--bs-primary-rgb), 0.5);
    transition: all 0.2s ease;
}

.copyable-text:hover {
    border-bottom-color: rgba(var(--bs-primary-rgb), 1);
    background-color: rgba(var(--bs-primary-rgb), 0.05);
}

/* Circular Pagination */
.pagination-circle .page-item {
    margin: 0 2px;
}

.pagination-circle .page-link {
    width: 32px;
    height: 32px;
    padding: 0 !important;
    display: flex !important;
    align-items: center;
    justify-content: center;
    border-radius: 50% !important;
    border: 1px solid var(--glass-border);
    background-color: var(--bs-body-bg);
    transition: all 0.2s ease;
}

.pagination-circle .page-item.active .page-link {
    background-color: var(--bs-primary);
    border-color: var(--bs-primary);
    color: white;
}

.pagination-circle .page-link:hover:not(.active) {
    background-color: rgba(var(--bs-primary-rgb), 0.08);
    border-color: rgba(var(--bs-primary-rgb), 0.3);
}