:root {
    --bg: #f7fbff;
    --surface: #ffffff;
    --surface-soft: #eef8f5;
    --ink: #1d2433;
    --muted: #647084;
    --line: #dbe6ef;
    --teal: #127c72;
    --teal-dark: #0d5f57;
    --coral: #e66b4f;
    --gold: #d59a21;
    --green: #3f8f5f;
    --shadow: 0 18px 45px rgba(30, 48, 68, 0.09);
    --radius: 8px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--ink);
    font-family: Arial, Helvetica, sans-serif;
    background:
        linear-gradient(135deg, rgba(18, 124, 114, 0.08), rgba(230, 107, 79, 0.08)),
        var(--bg);
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
select,
textarea {
    font: inherit;
}

button {
    cursor: pointer;
}

.app-shell {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 18px 0 48px;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 0 24px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-width: max-content;
}

.brand-mark {
    display: grid;
    width: 40px;
    height: 40px;
    place-items: center;
    border-radius: var(--radius);
    color: white;
    background: var(--teal);
    font-weight: 800;
}

.brand strong,
.brand small {
    display: block;
}

.brand small {
    color: var(--muted);
    margin-top: 2px;
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px;
}

.nav-links a {
    padding: 9px 12px;
    border: 1px solid transparent;
    border-radius: var(--radius);
    color: var(--muted);
    background: rgba(255, 255, 255, 0.62);
}

.nav-links a.active,
.nav-links a:hover {
    color: var(--teal-dark);
    border-color: rgba(18, 124, 114, 0.22);
    background: white;
}

.section-kicker {
    color: var(--coral);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0;
    text-transform: uppercase;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1 {
    margin-bottom: 10px;
    font-size: 3.1rem;
    line-height: 1.02;
}

h2 {
    margin-bottom: 14px;
    font-size: 1.15rem;
}

.muted,
.empty-state,
.form-hint {
    color: var(--muted);
}

.login-screen,
.dashboard-hero,
.page-title-row,
.session-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.login-screen {
    min-height: calc(100vh - 160px);
}

.login-panel {
    width: min(520px, 100%);
}

.login-side {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    flex: 1;
}

.mini-stat,
.panel-card,
.metric-card,
.mode-card,
.form-card {
    border: 1px solid rgba(219, 230, 239, 0.9);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.92);
    box-shadow: var(--shadow);
}

.mini-stat {
    min-height: 120px;
    padding: 16px;
}

.mini-stat strong {
    display: block;
    margin-bottom: 10px;
    color: var(--teal-dark);
    font-size: 1.3rem;
}

.mini-stat span {
    color: var(--muted);
}

.form-card,
.panel-card {
    padding: 18px;
}

.form-card {
    display: grid;
    gap: 14px;
}

label {
    display: grid;
    gap: 7px;
    color: var(--ink);
    font-weight: 700;
}

label span {
    font-size: 0.9rem;
}

input,
select,
textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 12px 13px;
    color: var(--ink);
    background: #fff;
    outline: none;
}

textarea {
    resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
    border-color: rgba(18, 124, 114, 0.72);
    box-shadow: 0 0 0 3px rgba(18, 124, 114, 0.12);
}

.primary-button,
.secondary-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    border: 1px solid transparent;
    border-radius: var(--radius);
    padding: 11px 16px;
    font-weight: 800;
}

.primary-button {
    color: white;
    background: var(--teal);
}

.primary-button:hover {
    background: var(--teal-dark);
}

.secondary-button {
    color: var(--teal-dark);
    background: var(--surface-soft);
    border-color: rgba(18, 124, 114, 0.22);
}

.secondary-button:disabled,
.primary-button:disabled {
    cursor: not-allowed;
    opacity: 0.58;
}

.full-button {
    width: 100%;
}

.notice {
    display: grid;
    gap: 4px;
    margin: 18px 0;
    padding: 13px;
    border-radius: var(--radius);
    border: 1px solid var(--line);
    background: white;
}

.notice.warning {
    border-color: rgba(213, 154, 33, 0.35);
    background: #fff8e8;
}

.metric-grid,
.mode-grid,
.settings-grid,
.two-column {
    display: grid;
    gap: 16px;
}

.metric-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin: 18px 0;
}

.metric-card {
    min-height: 116px;
    padding: 16px;
}

.metric-card span {
    color: var(--muted);
}

.metric-card strong {
    display: block;
    margin-top: 12px;
    font-size: 1.55rem;
}

.metric-link {
    display: inline-block;
    margin-top: 10px;
    color: var(--teal-dark);
    font-weight: 800;
}

.two-column {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-bottom: 16px;
}

.panel-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.panel-heading a,
.session-row a {
    color: var(--teal-dark);
    font-weight: 800;
}

.word-list,
.session-list,
.coach-output,
.skill-list,
.progress-list {
    display: grid;
    gap: 10px;
}

.word-row,
.session-row,
.feedback-block,
.progress-row {
    display: grid;
    gap: 4px;
    padding: 12px;
    border-radius: var(--radius);
    background: #f8fbfd;
}

.word-row span,
.session-row span {
    color: var(--muted);
    font-size: 0.92rem;
}

.session-row {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
}

.skill-row {
    display: grid;
    grid-template-columns: minmax(120px, 0.8fr) minmax(140px, 1.6fr) 52px;
    align-items: center;
    gap: 12px;
}

.skill-row span {
    color: var(--muted);
}

.skill-row strong {
    text-align: right;
}

.skill-meter {
    height: 10px;
    overflow: hidden;
    border-radius: 999px;
    background: #e7eef4;
}

.skill-meter span {
    display: block;
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--teal), var(--green));
}

.mode-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.mode-card {
    display: grid;
    gap: 10px;
    min-height: 140px;
    padding: 18px;
}

.mode-card:hover {
    border-color: rgba(18, 124, 114, 0.35);
    transform: translateY(-1px);
}

.mode-card strong {
    font-size: 1.1rem;
}

.mode-card span {
    color: var(--muted);
}

.session-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
    gap: 18px;
}

.session-main,
.session-side {
    display: grid;
    gap: 14px;
    align-content: start;
}

.status-pill {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    border-radius: var(--radius);
    padding: 7px 11px;
    color: var(--teal-dark);
    background: var(--surface-soft);
    font-weight: 800;
}

.coach-stream {
    display: grid;
    gap: 10px;
    min-height: 190px;
}

.chat-bubble {
    max-width: 88%;
    padding: 13px 14px;
    border-radius: var(--radius);
    border: 1px solid var(--line);
    background: white;
    box-shadow: 0 8px 28px rgba(30, 48, 68, 0.06);
    white-space: pre-wrap;
}

.chat-bubble.user {
    justify-self: end;
    color: white;
    border-color: transparent;
    background: var(--teal);
}

.composer {
    display: grid;
    gap: 12px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: white;
}

.composer-actions {
    display: flex;
    justify-content: space-between;
    gap: 10px;
}

.send-button {
    min-width: 140px;
}

.compact h2 {
    margin-bottom: 12px;
}

.feedback-block strong {
    color: var(--teal-dark);
}

.feedback-block ul {
    margin: 6px 0 0 18px;
    padding: 0;
}

.summary-output {
    display: grid;
    gap: 10px;
    color: var(--muted);
}

.review-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(280px, 0.38fr);
    gap: 18px;
    align-items: start;
}

.history-layout {
    display: grid;
    grid-template-columns: minmax(260px, 0.34fr) minmax(0, 1fr);
    gap: 18px;
    align-items: start;
}

.history-list-panel {
    position: sticky;
    top: 14px;
}

.history-list,
.history-detail,
.turn-list {
    display: grid;
    gap: 12px;
}

.history-session-link {
    display: grid;
    gap: 4px;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: #f8fbfd;
}

.history-session-link.active,
.history-session-link:hover {
    border-color: rgba(18, 124, 114, 0.32);
    background: var(--surface-soft);
}

.history-session-link span,
.history-session-link small {
    color: var(--muted);
}

.history-title-row,
.turn-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.memory-summary {
    display: grid;
    gap: 6px;
    padding: 14px;
    border-radius: var(--radius);
    background: #f8fbfd;
}

.memory-summary p {
    margin-bottom: 0;
    color: var(--muted);
}

.history-score-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
}

.history-score {
    display: grid;
    gap: 8px;
    min-height: 82px;
    padding: 12px;
    border-radius: var(--radius);
    background: var(--surface-soft);
}

.history-score span {
    color: var(--muted);
    font-size: 0.9rem;
}

.history-score strong {
    font-size: 1.45rem;
}

.history-section {
    margin-top: 14px;
}

.history-section h3 {
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.history-section ul {
    margin: 0 0 0 18px;
    padding: 0;
    color: var(--muted);
}

.compact-list {
    margin-top: 10px;
}

.turn-card {
    display: grid;
    gap: 10px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: #f8fbfd;
}

.turn-card.user {
    border-color: rgba(18, 124, 114, 0.22);
    background: #f1faf7;
}

.turn-card.assistant {
    border-color: rgba(230, 107, 79, 0.18);
    background: #fffaf8;
}

.turn-card p {
    margin-bottom: 0;
}

.turn-heading span {
    color: var(--muted);
    font-size: 0.9rem;
}

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

.turn-grid div {
    display: grid;
    gap: 5px;
    padding: 11px;
    border-radius: var(--radius);
    background: white;
}

.turn-grid span {
    color: var(--muted);
    font-size: 0.9rem;
}

.review-main,
.review-side,
.review-grid {
    display: grid;
    gap: 14px;
}

.review-heading {
    padding: 0 2px;
}

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

.review-card {
    display: grid;
    gap: 14px;
    padding: 18px;
    border: 1px solid rgba(219, 230, 239, 0.9);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.94);
    box-shadow: var(--shadow);
}

.review-card.review-complete {
    opacity: 0.72;
}

.review-card-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.review-card h2 {
    margin-bottom: 0;
    overflow-wrap: anywhere;
}

.review-card p {
    margin-bottom: 0;
}

.example-line {
    padding: 10px 12px;
    border-left: 3px solid var(--gold);
    border-radius: var(--radius);
    color: var(--muted);
    background: #fff9ea;
}

.review-form {
    display: grid;
    gap: 12px;
}

.inline-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
}

.inline-actions .primary-button,
.inline-actions .secondary-button {
    min-height: 40px;
}

.review-feedback {
    display: grid;
    gap: 8px;
}

.progress-row {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
}

.progress-row strong,
.progress-row span {
    overflow-wrap: anywhere;
}

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

.settings-grid .panel-card {
    display: grid;
    gap: 14px;
}

.settings-grid .wide {
    grid-column: 1 / -1;
}

.toast {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 20;
    max-width: min(360px, calc(100% - 36px));
    padding: 13px 15px;
    border-radius: var(--radius);
    color: white;
    background: var(--ink);
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(8px);
    transition: opacity 160ms ease, transform 160ms ease;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 900px) {
    .topbar,
    .login-screen,
    .dashboard-hero,
    .page-title-row,
    .session-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .nav-links {
        justify-content: flex-start;
    }

    .login-side,
    .metric-grid,
    .mode-grid,
    .two-column,
    .session-layout,
    .settings-grid,
    .history-layout,
    .review-layout,
    .review-grid {
        grid-template-columns: 1fr;
    }

    .history-list-panel {
        position: static;
    }

    .history-score-grid,
    .turn-grid {
        grid-template-columns: 1fr;
    }

    .login-side {
        width: 100%;
    }

    .metric-card {
        min-height: 92px;
    }
}

@media (max-width: 560px) {
    .app-shell {
        width: min(100% - 22px, 1120px);
        padding-top: 12px;
    }

    h1 {
        font-size: 2.1rem;
    }

    .nav-links a {
        padding: 8px 10px;
    }

    .composer-actions,
    .session-row,
    .progress-row,
    .skill-row,
    .history-title-row,
    .turn-heading {
        grid-template-columns: 1fr;
        flex-direction: column;
    }

    .skill-row strong {
        text-align: left;
    }

    .composer-actions {
        display: grid;
    }

    .inline-actions {
        display: grid;
    }

    .chat-bubble {
        max-width: 100%;
    }
}