/* ==========================================================================
   Classroom Decision Simulation
   Minimal Zen Theme
   File: assets/css/zen.css
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens
   -------------------------------------------------------------------------- */

:root {
    --zen-bg: #f5f7f4;
    --zen-bg-soft: #eef2ee;
    --zen-surface: #ffffff;
    --zen-surface-soft: #fafbf9;

    --zen-primary: #6f8f82;
    --zen-primary-dark: #557368;
    --zen-primary-soft: #e7efeb;

    --zen-accent: #b4c6bd;
    --zen-accent-soft: #f0f5f2;

    --zen-text: #35413c;
    --zen-text-soft: #59665f;
    --zen-muted: #7a867f;
    --zen-border: #dfe6e1;
    --zen-border-strong: #cad5ce;

    --zen-success: #5f8a72;
    --zen-success-soft: #e7f2eb;

    --zen-warning: #a4814d;
    --zen-warning-soft: #f7f0e4;

    --zen-danger: #a76565;
    --zen-danger-soft: #f7eaea;

    --zen-shadow-sm: 0 4px 14px rgba(53, 65, 60, 0.05);
    --zen-shadow-md: 0 12px 32px rgba(53, 65, 60, 0.08);

    --zen-radius-sm: 0.75rem;
    --zen-radius-md: 1rem;
    --zen-radius-lg: 1.35rem;
    --zen-radius-xl: 1.75rem;

    --zen-transition-fast: 160ms ease;
    --zen-transition-normal: 260ms ease;

    --zen-content-width: 1320px;
}


/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */

html {
    min-height: 100%;
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    margin: 0;
    background:
        radial-gradient(
            circle at top left,
            rgba(180, 198, 189, 0.12),
            transparent 34rem
        ),
        var(--zen-bg);
    color: var(--zen-text);
    font-family:
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        "Noto Sans Thai",
        "Noto Sans",
        Arial,
        sans-serif;
    line-height: 1.7;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: var(--zen-primary-soft);
    color: var(--zen-text);
}

a {
    color: var(--zen-primary-dark);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.16em;
}

a:hover {
    color: var(--zen-primary);
}

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

button {
    touch-action: manipulation;
}

img,
svg {
    max-width: 100%;
}

.container-xl {
    max-width: var(--zen-content-width);
}


/* --------------------------------------------------------------------------
   App Layout
   -------------------------------------------------------------------------- */

.app-body {
    min-height: 100vh;
}

.app-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-header {
    position: sticky;
    top: 0;
    z-index: 1030;
    background: rgba(250, 251, 249, 0.9);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-color: rgba(202, 213, 206, 0.72) !important;
}

.app-header .navbar {
    min-height: 4.7rem;
    padding-top: 0.65rem;
    padding-bottom: 0.65rem;
}

.app-main {
    flex: 1;
}

.app-footer {
    background: rgba(250, 251, 249, 0.72);
    border-color: var(--zen-border) !important;
}


/* --------------------------------------------------------------------------
   Brand
   -------------------------------------------------------------------------- */

.navbar-brand {
    color: var(--zen-text);
    text-decoration: none;
}

.navbar-brand:hover {
    color: var(--zen-text);
}

.brand-mark {
    width: 2.65rem;
    height: 2.65rem;
    flex: 0 0 auto;
    border: 1px solid var(--zen-border);
    border-radius: 50%;
    background: var(--zen-primary-soft);
    color: var(--zen-primary-dark);
    box-shadow: var(--zen-shadow-sm);
    font-size: 1.15rem;
}

.brand-title {
    color: var(--zen-text);
    font-size: 0.98rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    line-height: 1.25;
}

.brand-subtitle {
    margin-top: 0.18rem;
    color: var(--zen-muted);
    font-size: 0.74rem;
    font-weight: 400;
    line-height: 1.3;
}


/* --------------------------------------------------------------------------
   Generic Views
   -------------------------------------------------------------------------- */

.view-section {
    animation: zenFadeIn var(--zen-transition-normal);
}

.zen-panel {
    position: relative;
    padding: 1.5rem;
    border: 1px solid var(--zen-border);
    border-radius: var(--zen-radius-lg);
    background: rgba(255, 255, 255, 0.94);
    box-shadow: var(--zen-shadow-sm);
}

.zen-panel-compact {
    padding: 1.2rem 1.25rem;
}

.zen-panel-centered {
    max-width: 36rem;
    margin-top: min(12vh, 7rem);
    padding: 3rem 2rem;
}

.sidebar-stack {
    display: grid;
    gap: 1rem;
}


/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn {
    --bs-btn-border-radius: 0.85rem;
    min-height: 2.75rem;
    padding: 0.6rem 1rem;
    font-weight: 600;
    transition:
        transform var(--zen-transition-fast),
        border-color var(--zen-transition-fast),
        background-color var(--zen-transition-fast),
        box-shadow var(--zen-transition-fast),
        color var(--zen-transition-fast);
}

.btn:active {
    transform: translateY(1px);
}

.btn-zen-primary {
    --bs-btn-color: #ffffff;
    --bs-btn-bg: var(--zen-primary);
    --bs-btn-border-color: var(--zen-primary);

    --bs-btn-hover-color: #ffffff;
    --bs-btn-hover-bg: var(--zen-primary-dark);
    --bs-btn-hover-border-color: var(--zen-primary-dark);

    --bs-btn-active-color: #ffffff;
    --bs-btn-active-bg: var(--zen-primary-dark);
    --bs-btn-active-border-color: var(--zen-primary-dark);

    --bs-btn-disabled-color: #ffffff;
    --bs-btn-disabled-bg: var(--zen-accent);
    --bs-btn-disabled-border-color: var(--zen-accent);

    box-shadow: 0 6px 18px rgba(111, 143, 130, 0.16);
}

.btn-zen-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 9px 22px rgba(85, 115, 104, 0.2);
}

.btn-zen-outline {
    --bs-btn-color: var(--zen-text-soft);
    --bs-btn-bg: rgba(255, 255, 255, 0.6);
    --bs-btn-border-color: var(--zen-border-strong);

    --bs-btn-hover-color: var(--zen-primary-dark);
    --bs-btn-hover-bg: var(--zen-primary-soft);
    --bs-btn-hover-border-color: var(--zen-accent);

    --bs-btn-active-color: var(--zen-primary-dark);
    --bs-btn-active-bg: var(--zen-primary-soft);
    --bs-btn-active-border-color: var(--zen-accent);
}

.btn:focus-visible,
.choice-card:focus-visible {
    outline: 3px solid rgba(111, 143, 130, 0.28);
    outline-offset: 3px;
    box-shadow: none;
}


/* --------------------------------------------------------------------------
   Spinner and Status Icons
   -------------------------------------------------------------------------- */

.zen-spinner {
    width: 2.75rem;
    height: 2.75rem;
    color: var(--zen-primary);
}

.status-icon {
    width: 4.25rem;
    height: 4.25rem;
    display: grid;
    place-items: center;
    border-radius: 50%;
    font-size: 1.75rem;
}

.status-icon-success {
    background: var(--zen-success-soft);
    color: var(--zen-success);
}

.status-icon-error {
    background: var(--zen-danger-soft);
    color: var(--zen-danger);
}


/* --------------------------------------------------------------------------
   Scenario Meta
   -------------------------------------------------------------------------- */

.scenario-meta {
    padding: 0.4rem 0.1rem 0;
}

.scenario-title {
    color: var(--zen-text);
    font-size: clamp(2rem, 5vw, 3.25rem);
    font-weight: 760;
    letter-spacing: -0.04em;
    line-height: 1.12;
}

.scenario-description {
    max-width: 46rem;
    font-size: 1rem;
}

.scenario-duration {
    min-width: 8.5rem;
}

.zen-badge {
    padding: 0.5rem 0.8rem;
    border: 1px solid var(--zen-accent);
    background: var(--zen-primary-soft);
    color: var(--zen-primary-dark);
    font-size: 0.78rem;
    font-weight: 650;
}

.zen-badge-soft {
    border-color: var(--zen-border);
    background: var(--zen-surface);
    color: var(--zen-text-soft);
}


/* --------------------------------------------------------------------------
   Progress
   -------------------------------------------------------------------------- */

.zen-progress {
    --bs-progress-height: 0.55rem;
    overflow: hidden;
    border-radius: 999px;
    background: var(--zen-bg-soft);
}

.zen-progress .progress-bar {
    border-radius: inherit;
    background: linear-gradient(
        90deg,
        var(--zen-accent),
        var(--zen-primary)
    );
    transition: width 420ms ease;
}


/* --------------------------------------------------------------------------
   Scenario Card
   -------------------------------------------------------------------------- */

.scenario-card {
    padding: clamp(1.4rem, 3vw, 2.15rem);
    min-height: 24rem;
}

.scenario-card-header {
    max-width: 52rem;
}

.scenario-eyebrow {
    color: var(--zen-primary-dark);
    font-size: 0.76rem;
    font-weight: 750;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.scenario-state-title {
    color: var(--zen-text);
    font-size: clamp(1.55rem, 3vw, 2.15rem);
    font-weight: 730;
    letter-spacing: -0.025em;
    line-height: 1.25;
}

.scenario-state-description {
    color: var(--zen-text-soft);
    font-size: clamp(1rem, 1.8vw, 1.08rem);
    line-height: 1.85;
}

.zen-level-badge {
    flex: 0 0 auto;
    padding: 0.5rem 0.72rem;
    border: 1px solid var(--zen-border);
    background: var(--zen-surface-soft);
    color: var(--zen-muted);
    font-weight: 650;
}


/* --------------------------------------------------------------------------
   Choices
   -------------------------------------------------------------------------- */

.choices-container {
    display: grid;
    gap: 0.8rem;
}

.choice-card {
    width: 100%;
    position: relative;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 0.9rem;
    min-height: 4.25rem;
    padding: 0.9rem 1rem;
    border: 1px solid var(--zen-border);
    border-radius: var(--zen-radius-md);
    background: var(--zen-surface);
    color: var(--zen-text);
    text-align: left;
    box-shadow: none;
    cursor: pointer;
    transition:
        transform var(--zen-transition-fast),
        border-color var(--zen-transition-fast),
        background-color var(--zen-transition-fast),
        box-shadow var(--zen-transition-fast);
}

.choice-card:hover {
    transform: translateY(-2px);
    border-color: var(--zen-accent);
    background: var(--zen-surface-soft);
    box-shadow: var(--zen-shadow-sm);
}

.choice-card:active {
    transform: translateY(0);
}

.choice-card[disabled],
.choice-card.is-locked {
    cursor: not-allowed;
    opacity: 0.56;
    filter: grayscale(0.12);
}

.choice-card[disabled]:hover,
.choice-card.is-locked:hover {
    transform: none;
    border-color: var(--zen-border);
    background: var(--zen-surface);
    box-shadow: none;
}

.choice-index {
    width: 2rem;
    height: 2rem;
    display: grid;
    place-items: center;
    flex: 0 0 auto;
    border-radius: 50%;
    background: var(--zen-primary-soft);
    color: var(--zen-primary-dark);
    font-size: 0.78rem;
    font-weight: 750;
}

.choice-content {
    min-width: 0;
}

.choice-title {
    display: block;
    color: var(--zen-text);
    font-weight: 670;
    line-height: 1.45;
}

.choice-action {
    display: block;
    margin-top: 0.16rem;
    color: var(--zen-muted);
    font-size: 0.84rem;
    line-height: 1.5;
}

.choice-arrow {
    color: var(--zen-accent);
    font-size: 1.05rem;
    transition: transform var(--zen-transition-fast);
}

.choice-card:hover .choice-arrow {
    transform: translateX(3px);
    color: var(--zen-primary);
}

.choice-lock {
    color: var(--zen-muted);
    font-size: 0.95rem;
}


/* --------------------------------------------------------------------------
   Feedback
   -------------------------------------------------------------------------- */

.feedback-area {
    animation: zenSlideDown var(--zen-transition-normal);
}

.feedback-card {
    padding: 1rem 1.1rem;
    border: 1px solid var(--zen-accent);
    border-radius: var(--zen-radius-md);
    background: var(--zen-accent-soft);
}

.feedback-icon {
    width: 2.5rem;
    height: 2.5rem;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--zen-surface);
    color: var(--zen-primary-dark);
    font-size: 1.1rem;
}

.feedback-principle {
    color: var(--zen-primary-dark);
    font-size: 0.82rem;
    font-weight: 750;
}

.feedback-reflection {
    color: var(--zen-text-soft);
    line-height: 1.7;
}


/* --------------------------------------------------------------------------
   Score Panel
   -------------------------------------------------------------------------- */

.score-list {
    display: grid;
    gap: 0.95rem;
}

.score-item {
    display: grid;
    gap: 0.42rem;
}

.score-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.score-title {
    min-width: 0;
    color: var(--zen-text-soft);
    font-size: 0.86rem;
    font-weight: 570;
}

.score-value {
    min-width: 2.4rem;
    text-align: right;
    color: var(--zen-text);
    font-size: 0.82rem;
    font-weight: 750;
    font-variant-numeric: tabular-nums;
}

.score-track {
    position: relative;
    height: 0.42rem;
    overflow: hidden;
    border-radius: 999px;
    background: var(--zen-bg-soft);
}

.score-fill {
    height: 100%;
    width: 50%;
    border-radius: inherit;
    background: var(--zen-primary);
    transition: width 360ms ease;
}

.score-fill.is-positive {
    background: var(--zen-success);
}

.score-fill.is-neutral {
    background: var(--zen-primary);
}

.score-fill.is-negative {
    background: var(--zen-danger);
}

.score-change {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
    margin-left: 0.3rem;
    padding: 0.15rem 0.38rem;
    border-radius: 999px;
    background: var(--zen-primary-soft);
    color: var(--zen-primary-dark);
    font-size: 0.72rem;
    font-weight: 750;
}

.score-change.is-negative {
    background: var(--zen-danger-soft);
    color: var(--zen-danger);
}


/* --------------------------------------------------------------------------
   Learning Outcomes
   -------------------------------------------------------------------------- */

.learning-outcomes-list {
    display: grid;
    gap: 0.7rem;
}

.learning-outcome-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.7rem;
    align-items: flex-start;
    padding: 0.7rem 0;
    border-bottom: 1px solid var(--zen-border);
}

.learning-outcome-item:first-child {
    padding-top: 0;
}

.learning-outcome-item:last-child {
    padding-bottom: 0;
    border-bottom: 0;
}

.learning-outcome-icon {
    width: 1.85rem;
    height: 1.85rem;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--zen-primary-soft);
    color: var(--zen-primary-dark);
    font-size: 0.75rem;
    font-weight: 750;
}

.learning-outcome-title {
    margin: 0;
    color: var(--zen-text);
    font-size: 0.88rem;
    font-weight: 680;
    line-height: 1.45;
}

.learning-outcome-description {
    margin: 0.18rem 0 0;
    color: var(--zen-muted);
    font-size: 0.8rem;
    line-height: 1.55;
}


/* --------------------------------------------------------------------------
   Ending View
   -------------------------------------------------------------------------- */

.ending-panel {
    padding: clamp(2rem, 6vw, 4.5rem);
}

.ending-rating {
    color: var(--zen-primary-dark);
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.ending-feedback {
    max-width: 42rem;
    padding: 1.25rem 1.4rem;
    border: 1px solid var(--zen-border);
    border-radius: var(--zen-radius-md);
    background: var(--zen-surface-soft);
}

.ending-feedback-label {
    display: block;
    margin-bottom: 0.35rem;
    color: var(--zen-primary-dark);
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}


/* --------------------------------------------------------------------------
   Ending Ratings
   -------------------------------------------------------------------------- */

.ending-panel[data-rating="excellent"] .status-icon {
    background: var(--zen-success-soft);
    color: var(--zen-success);
}

.ending-panel[data-rating="good"] .status-icon {
    background: var(--zen-primary-soft);
    color: var(--zen-primary-dark);
}

.ending-panel[data-rating="neutral"] .status-icon {
    background: var(--zen-warning-soft);
    color: var(--zen-warning);
}

.ending-panel[data-rating="bad"] .status-icon {
    background: var(--zen-danger-soft);
    color: var(--zen-danger);
}


/* --------------------------------------------------------------------------
   History Timeline
   -------------------------------------------------------------------------- */

.history-timeline {
    position: relative;
    display: grid;
    gap: 0;
}

.history-item {
    position: relative;
    display: grid;
    grid-template-columns: 2.2rem 1fr;
    gap: 0.9rem;
    padding-bottom: 1.15rem;
}

.history-item:last-child {
    padding-bottom: 0;
}

.history-item::before {
    content: "";
    position: absolute;
    left: 1.07rem;
    top: 2.15rem;
    bottom: 0;
    width: 1px;
    background: var(--zen-border);
}

.history-item:last-child::before {
    display: none;
}

.history-marker {
    position: relative;
    z-index: 1;
    width: 2.2rem;
    height: 2.2rem;
    display: grid;
    place-items: center;
    border: 1px solid var(--zen-border);
    border-radius: 50%;
    background: var(--zen-surface);
    color: var(--zen-primary-dark);
    font-size: 0.78rem;
    font-weight: 750;
}

.history-content {
    min-width: 0;
    padding: 0.2rem 0 0.95rem;
}

.history-state-title {
    margin: 0;
    color: var(--zen-text);
    font-size: 0.92rem;
    font-weight: 700;
}

.history-choice-title {
    margin-top: 0.18rem;
    color: var(--zen-text-soft);
    font-size: 0.86rem;
    line-height: 1.55;
}

.history-meta {
    margin-top: 0.35rem;
    color: var(--zen-muted);
    font-size: 0.76rem;
}


/* --------------------------------------------------------------------------
   Utility States
   -------------------------------------------------------------------------- */

.is-transitioning {
    pointer-events: none;
}

.is-transitioning .scenario-card {
    opacity: 0.82;
}

.zen-muted {
    color: var(--zen-muted) !important;
}

.zen-text {
    color: var(--zen-text) !important;
}

.zen-surface {
    background: var(--zen-surface) !important;
}


/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (min-width: 992px) {
    .sidebar-stack {
        position: sticky;
        top: 6.25rem;
    }
}

@media (max-width: 991.98px) {
    .scenario-duration {
        min-width: auto;
    }

    .sidebar-stack {
        grid-template-columns: 1fr 1fr;
    }

    .sidebar-stack > *:last-child:nth-child(odd) {
        grid-column: 1 / -1;
    }
}

@media (max-width: 767.98px) {
    .app-header .navbar {
        min-height: 4.2rem;
    }

    .zen-panel {
        border-radius: var(--zen-radius-md);
    }

    .scenario-card {
        min-height: 20rem;
    }

    .scenario-title {
        font-size: clamp(1.85rem, 9vw, 2.55rem);
    }

    .choice-card {
        grid-template-columns: auto 1fr;
    }

    .choice-arrow {
        display: none;
    }

    .sidebar-stack {
        grid-template-columns: 1fr;
    }

    .sidebar-stack > *:last-child:nth-child(odd) {
        grid-column: auto;
    }
}

@media (max-width: 575.98px) {
    .app-main .container-xl {
        padding-left: 0.85rem;
        padding-right: 0.85rem;
    }

    .brand-mark {
        width: 2.3rem;
        height: 2.3rem;
    }

    .brand-title {
        font-size: 0.9rem;
    }

    .zen-panel {
        padding: 1.1rem;
    }

    .zen-panel-centered {
        margin-top: 8vh;
        padding: 2.4rem 1.2rem;
    }

    .scenario-meta {
        padding-top: 0.1rem;
    }

    .scenario-card {
        padding: 1.15rem;
    }

    .scenario-state-title {
        font-size: 1.45rem;
    }

    .scenario-state-description {
        font-size: 0.98rem;
        line-height: 1.75;
    }

    .choice-card {
        gap: 0.7rem;
        min-height: 4rem;
        padding: 0.8rem 0.85rem;
    }

    .choice-index {
        width: 1.8rem;
        height: 1.8rem;
        font-size: 0.72rem;
    }

    .ending-panel {
        padding: 1.8rem 1.15rem;
    }
}


/* --------------------------------------------------------------------------
   Motion
   -------------------------------------------------------------------------- */

@keyframes zenFadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes zenSlideDown {
    from {
        opacity: 0;
        transform: translateY(-6px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}


/* --------------------------------------------------------------------------
   Reduced Motion
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}


/* --------------------------------------------------------------------------
   High Contrast / Forced Colors
   -------------------------------------------------------------------------- */

@media (forced-colors: active) {
    .zen-panel,
    .choice-card,
    .feedback-card,
    .ending-feedback {
        border: 1px solid CanvasText;
    }

    .choice-card:focus-visible,
    .btn:focus-visible {
        outline: 2px solid Highlight;
    }
}


/* --------------------------------------------------------------------------
   Print
   -------------------------------------------------------------------------- */

@media print {
    body {
        background: #ffffff;
    }

    .app-header,
    .app-footer,
    .btn,
    #loadingView,
    #errorView {
        display: none !important;
    }

    .zen-panel {
        border: 1px solid #cccccc;
        box-shadow: none;
    }
}