/* Agents directory + Self-Learning Agent / Teacher Agent pages. Uses the
   site's edu-theme design tokens (static/css/edu-theme.css), not a bespoke
   palette — mirrors projects/history_tutor/history_tutor.css's own
   convention rather than site_concierge.css's older hardcoded-dark colors,
   which predate the "chalk" rebrand (see home_concierge.css's header
   comment for the same reasoning). */

.agents-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px 80px;
}

.agents-header {
    position: relative;
    text-align: center;
    margin-bottom: 32px;
}

.agents-back {
    position: absolute;
    left: 0;
    top: 4px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
}

.agents-back:hover {
    color: var(--accent-blue);
}

.agents-header h1 {
    font-size: 2.2rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.agents-header p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 640px;
    margin: 0 auto;
}

/* ---------- Directory page: agent cards ---------- */

.agents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
    margin-top: 24px;
}

.agent-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    background: var(--secondary-dark);
    border: 1px solid var(--hairline);
    border-radius: 14px;
    padding: 22px;
    text-decoration: none;
    color: inherit;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

a.agent-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--glass-shadow);
    border-color: var(--accent-blue);
}

.agent-card--soon {
    opacity: 0.6;
}

.agent-card-subject {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--accent-green);
    font-weight: 600;
}

.agent-card h2 {
    font-size: 1.3rem;
    margin: 0;
    color: var(--text-primary);
}

.agent-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    flex: 1;
}

.agent-card-cta {
    font-weight: 600;
    color: var(--accent-deep);
    font-size: 0.9rem;
}

/* ---------- Self-Learner's Agent page: two-column guided layout ---------- */
/* Same grid shape as History Tutor's .ht-layout/.ht-chat-col/.ht-stage-col
   (static/css/projects/history_tutor/history_tutor.css) -- chat on the
   left, a widget stage on the right that accumulates path/concept/
   simulation/quiz cards as the guide calls tools. Teacher Agent's page
   keeps the older single-column .agent-chat (still used standalone below). */

.agent-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: 24px;
    align-items: start;
    margin-bottom: 40px;
}

@media (max-width: 860px) {
    .agent-layout {
        grid-template-columns: 1fr;
    }
}

.agent-chat-col .agent-chat {
    margin-bottom: 0;
    height: 70vh;
    min-height: 460px;
    max-height: 640px;
}

.agent-stage-col {
    min-height: 420px;
}

.agent-stage {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-height: 70vh;
    overflow-y: auto;
    padding-right: 2px;
}

.agent-progress-summary {
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: var(--tertiary-dark);
    border-radius: 10px;
    padding: 8px 14px;
    margin: 0 0 12px;
}

.agent-stage-empty {
    color: var(--text-muted);
    text-align: center;
    padding: 40px 20px;
    border: 1px dashed var(--hairline);
    border-radius: 14px;
}

.agent-widget {
    background: var(--secondary-dark);
    border: 1px solid var(--hairline);
    border-radius: 14px;
    padding: 16px;
}

@media (prefers-reduced-motion: no-preference) {
    .agent-widget {
        animation: agent-widget-in 0.25s ease;
    }
}

@keyframes agent-widget-in {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.agent-widget h3 {
    margin: 0 0 10px;
    font-size: 1rem;
    color: var(--text-primary);
}

/* Path widget */

.agent-path-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
    counter-reset: agent-path;
}

.agent-path-step {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 8px 10px 8px 34px;
    position: relative;
    border-radius: 8px;
    background: var(--tertiary-dark);
    counter-increment: agent-path;
}

.agent-path-step::before {
    content: counter(agent-path);
    position: absolute;
    left: 10px;
    top: 9px;
    font-family: 'IBM Plex Mono', 'Courier New', monospace;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent-deep);
}

.agent-path-step-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.92rem;
}

.agent-path-step-goal {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Concept widget */

.agent-concept-summary {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.5;
    margin: 0;
}

/* Simulation widget */

.agent-sim-focus {
    color: var(--text-secondary);
    font-size: 0.88rem;
    margin: 0 0 10px;
}

.agent-sim-body {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Predict step -- appears before the canvas/controls, blocks the primary
   action until a choice is picked (see physics_widgets.js's buildPredict). */

.agent-sim-predict-q {
    font-size: 0.9rem;
    color: var(--text-primary);
    margin: 0 0 8px;
    font-weight: 600;
}

.agent-sim-predict-choices {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.agent-sim-predict-btn {
    text-align: left;
    background: var(--primary-dark);
    border: 1px solid var(--hairline);
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 0.85rem;
    cursor: pointer;
    color: var(--text-primary);
    font-family: inherit;
}

.agent-sim-predict-btn:hover:not(:disabled) {
    border-color: var(--accent-blue);
}

.agent-sim-predict-btn:disabled {
    cursor: default;
    opacity: 0.6;
}

.agent-sim-predict-btn.agent-sim-predict-picked {
    border-color: var(--accent-blue);
    background: rgba(150, 48, 95, 0.1);
    opacity: 1;
    font-weight: 600;
}

.agent-sim-canvas-wrap {
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--hairline);
    background: var(--tertiary-dark);
    display: flex;
    justify-content: center;
}

.agent-sim-canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

.agent-sim-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.agent-sim-play-btn,
.agent-sim-secondary-btn {
    border-radius: 8px;
    padding: 8px 14px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    border: none;
}

.agent-sim-play-btn {
    background: var(--accent-blue);
    color: #fff;
}

.agent-sim-play-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.agent-sim-secondary-btn {
    background: var(--tertiary-dark);
    color: var(--text-primary);
    border: 1px solid var(--hairline);
}

.agent-sim-secondary-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.agent-sim-status {
    font-size: 0.8rem;
    font-style: italic;
    color: var(--text-muted);
    margin: 6px 0 0;
    text-align: center;
}

.agent-sim-readout {
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: var(--tertiary-dark);
    border-radius: 8px;
    padding: 8px 12px;
    margin: 0;
}

.agent-sim-lab-link {
    display: inline-block;
    margin-top: 10px;
    font-size: 0.85rem;
    color: var(--accent-deep);
    text-decoration: none;
    font-weight: 600;
}

.agent-sim-lab-link:hover {
    text-decoration: underline;
}

/* Quiz widget */

.agent-quiz-question {
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.agent-quiz-choices {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.agent-quiz-choice {
    text-align: left;
    background: var(--primary-dark);
    border: 1px solid var(--hairline);
    border-radius: 8px;
    padding: 9px 12px;
    font-size: 0.9rem;
    cursor: pointer;
    color: var(--text-primary);
    font-family: inherit;
}

.agent-quiz-choice:hover:not(:disabled) {
    border-color: var(--accent-blue);
}

.agent-quiz-choice:disabled {
    cursor: default;
}

.agent-quiz-choice.agent-correct {
    border-color: var(--accent-green);
    background: rgba(47, 122, 107, 0.12);
}

.agent-quiz-choice.agent-incorrect {
    border-color: #b23a3a;
    background: rgba(178, 58, 58, 0.1);
}

.agent-quiz-feedback {
    margin-top: 12px;
    font-size: 0.88rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--hairline);
    padding-top: 10px;
}

@media (max-width: 600px) {
    .agent-chat-col .agent-chat {
        height: 65vh;
    }
}

/* ---------- Self-Learner's Agent / Teacher Agent pages: chat ---------- */

.agent-chat {
    background: var(--secondary-dark);
    border: 1px solid var(--hairline);
    border-radius: 14px;
    display: flex;
    flex-direction: column;
    height: 60vh;
    min-height: 380px;
    max-height: 520px;
    overflow: hidden;
    margin-bottom: 40px;
}

.agent-chat .chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.agent-chat .message {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.agent-chat .message-avatar {
    flex-shrink: 0;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 700;
    background: var(--tertiary-dark);
    color: var(--accent-blue);
}

.agent-chat .message.user .message-avatar {
    background: var(--accent-blue);
    color: #fff;
}

.agent-chat .message-content {
    background: var(--tertiary-dark);
    padding: 10px 14px;
    border-radius: 10px;
    line-height: 1.5;
    max-width: 80%;
    color: var(--text-primary);
    /* A drafted lesson plan (Teacher Agent's generate_lesson_plan) lands in
       this same bubble as plain text with real line breaks (Hook /
       Instruction / Practice sections) -- without this, CSS's default
       `normal` collapses them into one run-on paragraph. Still wraps long
       lines normally, unlike `pre`. Same reasoning as home_concierge.css's
       identical rule for the homepage concierge widget. */
    white-space: pre-wrap;
}

.agent-chat .message.user {
    flex-direction: row-reverse;
}

.agent-chat .message.user .message-content {
    background: var(--accent-blue);
    color: #fff;
}

/* Starter-topic chips under Zeb's greeting (self_learner.html) -- a
   click-to-ask affordance for a visitor who doesn't know what to try yet.
   The [hidden] override is needed because of cascade ORIGIN, not
   specificity: the [hidden] rule it has to beat is the user agent
   stylesheet's, and any author-level declaration (display:flex below)
   beats a UA declaration regardless of specificity -- so plain
   .agent-suggestions{display:flex} would make .hidden = true a no-op
   without this. */
.agent-suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.agent-suggestions[hidden] {
    display: none;
}

.agent-suggestion-chip {
    background: var(--tertiary-dark);
    border: 1px solid var(--hairline);
    border-radius: 999px;
    padding: 6px 14px;
    font-size: 0.82rem;
    font-family: inherit;
    color: var(--text-primary);
    cursor: pointer;
}

.agent-suggestion-chip:hover,
.agent-suggestion-chip:focus-visible {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.agent-chat .typing-indicator {
    display: flex;
    gap: 4px;
    padding: 2px 0;
}

.agent-chat .typing-indicator span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-muted);
    animation: agent-chat-blink 1.2s infinite ease-in-out;
}

.agent-chat .typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.agent-chat .typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes agent-chat-blink {
    0%, 80%, 100% { opacity: 0.25; }
    40% { opacity: 1; }
}

.agent-chat .chat-input-area {
    display: flex;
    gap: 10px;
    padding: 14px;
    border-top: 1px solid var(--hairline);
}

.agent-chat .chat-input {
    flex: 1;
    resize: none;
    background: var(--primary-dark);
    border: 1px solid var(--hairline);
    border-radius: 8px;
    color: var(--text-primary);
    padding: 10px 12px;
    font-size: 0.95rem;
    font-family: inherit;
}

.agent-chat .chat-input:focus {
    outline: none;
    border-color: var(--accent-blue);
}

.agent-chat .send-btn {
    background: var(--accent-blue);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 0 20px;
    font-weight: 700;
    cursor: pointer;
    transition: opacity 0.2s;
}

.agent-chat .send-btn:hover {
    opacity: 0.9;
}

.agent-chat .send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* "Start over" control -- sits in .agent-guide-header on the Physics
   Teaching Agent page (guide.css) or in this standalone toolbar on Teacher
   Agent, which has no guide header. Text-link styling, not a full button:
   a rare, low-stakes action that shouldn't compete visually with Send. */
.agent-chat-toolbar {
    display: flex;
    padding: 10px 14px 0;
}

.agent-reset-btn {
    margin-left: auto;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.8rem;
    font-family: inherit;
    text-decoration: underline;
    cursor: pointer;
    padding: 4px 2px;
}

.agent-reset-btn:hover:not(:disabled) {
    color: var(--accent-blue);
}

.agent-reset-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.agent-chat .chat-error {
    background: rgba(163, 31, 52, 0.1);
    border: 1px solid rgba(163, 31, 52, 0.35);
    color: var(--text-primary);
    border-radius: 8px;
    padding: 8px 14px;
    font-size: 0.85rem;
}

/* Newtonian Physics Tutor only: a compact citation line under the AI's
   message bubble (agent_chat.js's renderSources), replacing full resource
   cards -- external resources are supplementary references here, not
   featured content, so they read like a footnote, not a recommendation. */

.agent-sources {
    font-size: 0.78rem;
    color: var(--text-muted);
    padding-left: 40px; /* aligns under the message bubble, past the avatar */
}

.agent-sources-label {
    font-weight: 600;
    margin-right: 4px;
}

.agent-sources a {
    color: var(--text-muted);
    text-decoration: underline;
}

.agent-sources a:hover {
    color: var(--accent-deep);
}

.agent-sources-sep {
    margin: 0 6px;
}

/* ---------- Self-Learning Agent / Teacher Agent pages: static sections ---------- */

.agent-section {
    margin-bottom: 40px;
}

.agent-section h2 {
    font-size: 1.4rem;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.agent-template-card {
    display: block;
    background: var(--secondary-dark);
    border: 1px solid var(--hairline);
    border-radius: 14px;
    padding: 22px;
    text-decoration: none;
    color: inherit;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.agent-template-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--glass-shadow);
    border-color: var(--accent-blue);
}

.agent-template-eyebrow {
    font-family: 'IBM Plex Mono', 'Courier New', monospace;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--accent-purple);
    font-weight: 600;
}

.agent-template-card h3 {
    font-size: 1.2rem;
    margin: 6px 0;
    color: var(--text-primary);
}

.agent-template-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 10px;
}

.agent-template-cta {
    font-weight: 600;
    color: var(--accent-deep);
    font-size: 0.9rem;
}

.agent-resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
}

.agent-resource-card {
    display: block;
    background: var(--secondary-dark);
    border: 1px solid var(--hairline);
    border-radius: 12px;
    padding: 16px 18px;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.2s, transform 0.2s;
}

.agent-resource-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-2px);
}

.agent-resource-type {
    font-family: 'IBM Plex Mono', 'Courier New', monospace;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-deep);
}

.agent-resource-card h3 {
    font-size: 1rem;
    color: var(--text-primary);
    margin: 4px 0;
}

.agent-resource-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Newtonian Physics Tutor's static "Additional Sources" section only --
   Teacher Agent keeps the full .agent-resource-grid cards above, since
   resources are its main content, not a footnote. */

.agent-additional-sources {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.agent-additional-sources a {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
}

.agent-additional-sources a:hover {
    color: var(--accent-deep);
    text-decoration: underline;
}

.agent-additional-sources a span {
    color: var(--text-muted);
    font-size: 0.78rem;
}

@media (max-width: 600px) {
    .agent-chat {
        height: 65vh;
    }

    /* .agents-back is absolutely positioned over the centered h1 (fine at
       desktop widths where the title is short and there's room on either
       side); at narrow widths it overlaps the title text, so drop back to
       static flow and stack it above instead. */
    .agents-header {
        text-align: left;
    }

    .agents-back {
        position: static;
        display: inline-block;
        margin-bottom: 12px;
    }

    .agents-header h1,
    .agents-header p {
        text-align: left;
        margin-left: 0;
        margin-right: 0;
    }
}