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

:root {
    --color-bg: #ffffff;
    --color-bg-light: #f8f9fa;
    --color-bg-card: #ffffff;
    --color-accent: #ffbf00;
    --color-accent-hover: #e6ac00;
    --color-accent-subtle: rgba(255, 191, 0, 0.1);
    --color-text: #18181b;
    --color-muted: #71717a;
    --color-border: #e4e4e7;
    --sidebar-width: 220px;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    font-family: "Red Hat Display", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--color-bg);
    border-right: 1px solid var(--color-border);
}

/* Desktop: fixed sidebar — override Bootstrap offcanvas-lg transparent bg */
@media (min-width: 992px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        z-index: 1030;
        background-color: var(--color-bg) !important;
    }
    .sidebar .offcanvas-body {
        flex-grow: 1 !important;
        background-color: var(--color-bg) !important;
    }
}

.sidebar-brand {
    padding: 1.25rem 1rem;
    border-bottom: 1px solid var(--color-border);
    font-size: 1.15rem;
}

.sidebar-brand a {
    color: var(--color-accent);
}

.sidebar-brand a span {
    color: var(--color-text);
}

.sidebar-nav {
    padding: 0.75rem 0;
}

.sidebar-nav .nav-link {
    color: var(--color-muted);
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
    border-radius: 0;
    border-left: 3px solid transparent;
    transition: background-color 0.15s, color 0.15s, border-color 0.15s;
}

.sidebar-nav .nav-link:hover {
    background-color: var(--color-accent-subtle);
    color: var(--color-text);
}

.sidebar-nav .nav-link.active {
    color: var(--color-text);
    background-color: var(--color-accent-subtle);
    border-left-color: var(--color-accent);
    font-weight: 600;
}

.sidebar-nav .nav-link i {
    width: 1.25em;
    text-align: center;
    margin-right: 0.5rem;
}

.sidebar-progress {
    padding: 0.5rem 1rem 0.75rem;
}

/* Bottom section: lang + user grouped together */
.sidebar-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: 0.5rem;
}

.sidebar-lang {
    padding: 0.25rem;
    display: flex;
    gap: 0;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    overflow: hidden;
    margin: 0 1rem 0.5rem;
}

.lang-pill {
    flex: 1;
    text-align: center;
    padding: 0.3rem 0;
    font-size: 0.8rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--color-muted);
    transition: background-color 0.15s, color 0.15s;
}

.lang-pill.active {
    background-color: var(--color-accent);
    color: var(--color-text);
}

.lang-pill:not(.active):hover {
    background-color: var(--color-accent-subtle);
    color: var(--color-text);
}

.sidebar-user {
    padding: 0.75rem 1rem;
}

.sidebar-user-name {
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.sidebar-user-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.8rem;
}

.sidebar-user-links a {
    color: var(--color-muted);
    text-decoration: none;
}

.sidebar-user-links a:hover {
    color: var(--color-accent-hover);
}

.sidebar-logout-btn {
    background: none;
    border: none;
    padding: 0;
    color: var(--color-muted);
    font-size: 0.8rem;
    cursor: pointer;
    font-family: inherit;
}

.sidebar-logout-btn:hover {
    color: var(--color-accent-hover);
}

/* Mobile hamburger toggle */
.sidebar-toggle {
    position: fixed;
    top: 0.75rem;
    left: 0.75rem;
    z-index: 1040;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
    padding: 0.25rem 0.5rem;
    font-size: 1.25rem;
    line-height: 1;
    color: var(--color-text);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

/* Main wrapper */
.main-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding-top: 3rem; /* clear fixed hamburger on mobile */
}

@media (min-width: 992px) {
    .main-wrapper {
        margin-left: var(--sidebar-width);
        padding-top: 0;
    }
}

main {
    flex: 1;
}

/* Full-height layout for iframe pages */
.main-wrapper-fullheight {
    height: 100vh;
}

.main-wrapper-fullheight main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.iframe-fullheight {
    flex: 1;
    min-height: 0;
}

.iframe-fullheight iframe {
    display: block;
    width: 100%;
    height: 100%;
    border: none;
}

/* Accent color utilities */
.text-accent { color: var(--color-accent) !important; }
.bg-accent { background-color: var(--color-accent) !important; }
.btn-accent {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-text) !important;
    font-weight: 600;
}
.btn-accent:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: var(--color-text) !important;
}
.btn-outline-accent {
    border-color: var(--color-accent);
    color: var(--color-accent);
}
.btn-outline-accent:hover {
    background-color: var(--color-accent);
    color: var(--color-text);
}

/* Cards */
.card-dark {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 0.75rem;
    color: var(--color-text);
}

/* Hero */
.hero-section {
    position: relative;
    min-height: 60vh;
    display: flex;
    align-items: center;
}
.hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0.15;
}
.min-vh-50 { min-height: 50vh; }

/* Progress bars */
.progress {
    background-color: rgba(0, 0, 0, 0.06);
    border-radius: 0.5rem;
}

/* Tables */
.table {
    --bs-table-bg: transparent;
    --bs-table-hover-bg: var(--color-accent-subtle);
}

/* Forms */
.form-control, .form-select {
    background-color: var(--color-bg);
    border-color: var(--color-border);
    color: var(--color-text);
}
.form-control:focus, .form-select:focus {
    background-color: var(--color-bg);
    border-color: var(--color-accent);
    color: var(--color-text);
    box-shadow: 0 0 0 0.2rem rgba(255, 191, 0, 0.2);
}

/* Dropdown */
.dropdown-menu {
    background-color: var(--color-bg);
    border-color: var(--color-border);
}
.dropdown-item {
    color: var(--color-text);
}
.dropdown-item:hover {
    background-color: var(--color-accent-subtle);
    color: var(--color-text);
}

/* Alert overrides */
.alert-success { background-color: rgba(255, 191, 0, 0.1); border-color: var(--color-accent); color: var(--color-text); }
.alert-info { background-color: rgba(255, 191, 0, 0.06); border-color: rgba(255, 191, 0, 0.3); color: var(--color-text); }
.alert-error, .alert-danger { background-color: rgba(220, 53, 69, 0.1); border-color: #dc3545; color: #991b1b; }

/* List group */
.list-group-item.bg-transparent { color: var(--color-text); }

/* Badge overrides for light theme */
.badge.bg-accent { color: var(--color-text) !important; }

/* ---- Exercise Chat Sidebar ---- */
.exercise-content-row {
    display: flex;
    flex: 1;
    min-height: 0;
    overflow: hidden;
}
.exercise-iframe-col {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}
.exercise-chat-col {
    width: 380px;
    min-width: 320px;
    max-width: 420px;
    border-left: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
}
.chat-panel {
    display: flex;
    flex-direction: column;
    height: 100%;
}
.chat-header {
    padding: 0.625rem 1rem;
    border-bottom: 1px solid var(--color-border);
    font-weight: 600;
    font-size: 0.85rem;
    flex-shrink: 0;
}
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}
.chat-msg {
    max-width: 90%;
    padding: 0.5rem 0.75rem;
    border-radius: 0.75rem;
    font-size: 0.8125rem;
    line-height: 1.55;
    white-space: pre-wrap;
    word-wrap: break-word;
}
.chat-msg-user {
    align-self: flex-end;
    background-color: var(--color-accent);
    color: var(--color-text);
    border-bottom-right-radius: 0.25rem;
}
.chat-msg-assistant {
    align-self: flex-start;
    background-color: var(--color-bg-light);
    color: var(--color-text);
    border-bottom-left-radius: 0.25rem;
}
.chat-msg-initial {
    max-width: 100%;
    border-left: 3px solid var(--color-accent);
    border-radius: 0 0.75rem 0.75rem 0;
    background-color: rgba(255, 191, 0, 0.06);
    font-size: 0.8125rem;
}
.chat-msg-streaming {
    opacity: 0.85;
}
.chat-input-row {
    padding: 0.625rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
}
.chat-input-row input {
    flex: 1;
    font-size: 0.8125rem;
}
.chat-input-row .btn {
    flex-shrink: 0;
}

/* Floating chat button for mobile */
.chat-fab {
    position: fixed;
    bottom: 1.25rem;
    right: 1.25rem;
    z-index: 1050;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--color-accent);
    border: none;
    color: var(--color-text);
    font-size: 1.35rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
}
.chat-fab:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

/* Mobile offcanvas chat */
#chatOffcanvas .chat-panel {
    height: 100%;
}
#chatOffcanvas .offcanvas-body {
    padding: 0;
}