@import "tailwindcss";

/*
  Dynamic Agility Website
  Minimal editorial design system
*/

:root {
    --da-ink: #171412;
    --da-ink-soft: #3f3a35;
    --da-muted: #6f675f;
    --da-muted-light: #9b9187;

    --da-paper: #f7f3ed;
    --da-paper-soft: #fbf8f3;
    --da-card: rgba(255, 255, 255, 0.78);
    --da-card-strong: #ffffff;

    --da-line: rgba(45, 38, 31, 0.12);
    --da-line-strong: rgba(45, 38, 31, 0.22);

    --da-accent: #9a6b3f;
    --da-accent-dark: #6e4728;
    --da-accent-soft: #ead8c4;

    --da-dark: #151312;
    --da-dark-2: #24201d;

    --da-radius-sm: 1rem;
    --da-radius-md: 1.5rem;
    --da-radius-lg: 2rem;
    --da-radius-xl: 2.75rem;

    --da-shadow-sm: 0 1px 2px rgba(22, 18, 14, 0.04), 0 8px 24px rgba(22, 18, 14, 0.06);
    --da-shadow-md: 0 18px 60px rgba(22, 18, 14, 0.12);
    --da-shadow-lg: 0 30px 100px rgba(22, 18, 14, 0.18);
}

html {
    scroll-behavior: smooth;
    background: var(--da-paper);
}

body {
    margin: 0;
    color: var(--da-ink);
    background:
            radial-gradient(circle at top left, rgba(154, 107, 63, 0.14), transparent 32rem),
            radial-gradient(circle at 80% 10%, rgba(111, 103, 95, 0.11), transparent 30rem),
            linear-gradient(180deg, var(--da-paper-soft), var(--da-paper));
    font-family:
            Inter,
            ui-sans-serif,
            system-ui,
            -apple-system,
            BlinkMacSystemFont,
            "Segoe UI",
            sans-serif;
    font-feature-settings: "liga" 1, "kern" 1;
    -webkit-font-smoothing: antialiased;
    text-rendering: geometricPrecision;
}

::selection {
    color: white;
    background: var(--da-accent);
}

a {
    text-decoration-thickness: 0.08em;
    text-underline-offset: 0.18em;
}

h1,
h2,
h3 {
    text-wrap: balance;
}

p {
    text-wrap: pretty;
}

.da-page {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    background:
            linear-gradient(180deg, rgba(255, 255, 255, 0.68), rgba(255, 255, 255, 0)),
            var(--da-paper);
}

.da-page::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -2;
    pointer-events: none;
    background-image:
            linear-gradient(rgba(23, 20, 18, 0.035) 1px, transparent 1px),
            linear-gradient(90deg, rgba(23, 20, 18, 0.035) 1px, transparent 1px);
    background-size: 72px 72px;
    mask-image: linear-gradient(to bottom, black, transparent 72%);
}

.da-page::after {
    content: "";
    position: fixed;
    inset: auto -20vw -30vh -20vw;
    z-index: -1;
    height: 54vh;
    pointer-events: none;
    background:
            radial-gradient(circle at 50% 50%, rgba(154, 107, 63, 0.13), transparent 42%),
            radial-gradient(circle at 70% 20%, rgba(23, 20, 18, 0.08), transparent 35%);
    filter: blur(20px);
}

/* Fix for the custom class used in the ERB page. */
.text-stone-650 {
    color: var(--da-muted);
}

/* Header */

.da-page header {
    border-bottom: 1px solid rgba(45, 38, 31, 0.12);
    background: rgba(247, 243, 237, 0.82);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset;
}

.da-page header::after {
    content: "";
    position: absolute;
    right: 0;
    bottom: -1px;
    left: 0;
    height: 1px;
    background: linear-gradient(
            90deg,
            transparent,
            rgba(154, 107, 63, 0.5),
            transparent
    );
}

.da-page header a {
    transition:
            color 180ms ease,
            background-color 180ms ease,
            border-color 180ms ease,
            transform 180ms ease;
}

.da-page header a:hover {
    transform: translateY(-1px);
}

/* Hero */

.da-page main > section:first-child {
    position: relative;
    isolation: isolate;
    min-height: calc(100vh - 5rem);
}

.da-page main > section:first-child::before {
    content: "";
    position: absolute;
    top: 5rem;
    right: 5vw;
    z-index: -1;
    width: min(42rem, 70vw);
    aspect-ratio: 1;
    border-radius: 999px;
    background:
            radial-gradient(circle at 35% 35%, rgba(255, 255, 255, 0.9), transparent 24%),
            radial-gradient(circle at 50% 50%, rgba(234, 216, 196, 0.9), transparent 42%),
            radial-gradient(circle at 70% 70%, rgba(154, 107, 63, 0.16), transparent 58%);
    filter: blur(2px);
    opacity: 0.9;
}

.da-page main > section:first-child::after {
    content: "";
    position: absolute;
    top: 11rem;
    right: 12vw;
    z-index: -1;
    width: 18rem;
    height: 18rem;
    border: 1px solid rgba(154, 107, 63, 0.22);
    border-radius: 999px;
    opacity: 0.85;
}

.da-page main > section:first-child h1 {
    max-width: 13ch;
    letter-spacing: -0.075em;
    line-height: 0.9;
}

.da-page main > section:first-child p {
    color: var(--da-muted);
}

.da-page main > section:first-child aside {
    position: relative;
    overflow: hidden;
    border-color: rgba(45, 38, 31, 0.12);
    background:
            linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.62)),
            radial-gradient(circle at top right, rgba(234, 216, 196, 0.7), transparent 44%);
    box-shadow: var(--da-shadow-md);
    backdrop-filter: blur(18px);
}

.da-page main > section:first-child aside::before {
    content: "";
    position: absolute;
    top: 0;
    left: 2rem;
    width: 6rem;
    height: 3px;
    border-radius: 999px;
    background: var(--da-accent);
}

/* Buttons */

.da-page a[href^="#"],
.da-page a[href^="mailto:"] {
    will-change: transform;
}

.da-page a[href^="#"]:hover,
.da-page a[href^="mailto:"]:hover {
    transform: translateY(-1px);
}

/* Sections */

.da-page main > section {
    position: relative;
}

.da-page section[id] {
    scroll-margin-top: 6rem;
}

.da-page section[id] > div:first-child p:first-child,
.da-page section p.uppercase,
.da-page .uppercase {
    letter-spacing: 0.22em;
}

.da-page section h2 {
    letter-spacing: -0.045em;
    line-height: 1.02;
}

.da-page section h3 {
    letter-spacing: -0.02em;
}

/* Cards */

.da-page article {
    position: relative;
    transform: translateZ(0);
}

.da-page article,
.da-page aside,
.da-page .rounded-3xl,
.da-page .rounded-\[2rem\] {
    box-shadow: var(--da-shadow-sm);
}

.da-page article {
    transition:
            transform 220ms ease,
            box-shadow 220ms ease,
            border-color 220ms ease,
            background-color 220ms ease;
}

.da-page article:hover {
    transform: translateY(-3px);
    box-shadow: var(--da-shadow-md);
}

/* Workshop flow cards */

#flow article {
    overflow: hidden;
    background:
            linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.76));
}

#flow article::before {
    content: "";
    position: absolute;
    top: 0;
    right: 1.5rem;
    left: 1.5rem;
    height: 3px;
    border-radius: 999px;
    background: linear-gradient(
            90deg,
            rgba(154, 107, 63, 0.15),
            rgba(154, 107, 63, 0.8),
            rgba(154, 107, 63, 0.15)
    );
    opacity: 0;
    transition: opacity 220ms ease;
}

#flow article:hover::before {
    opacity: 1;
}

#flow article p:first-child {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.35rem;
    height: 2.35rem;
    border: 1px solid rgba(154, 107, 63, 0.22);
    border-radius: 999px;
    background: rgba(234, 216, 196, 0.42);
    color: var(--da-accent-dark);
}

/* Dark sections */

.da-page .bg-stone-950 {
    position: relative;
    overflow: hidden;
    background:
            radial-gradient(circle at 8% 20%, rgba(154, 107, 63, 0.42), transparent 26rem),
            radial-gradient(circle at 88% 10%, rgba(255, 255, 255, 0.08), transparent 28rem),
            linear-gradient(135deg, var(--da-dark), var(--da-dark-2)) !important;
}

.da-page .bg-stone-950::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image:
            linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
            linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
    background-size: 58px 58px;
    mask-image: radial-gradient(circle at 50% 50%, black, transparent 75%);
}

.da-page .bg-stone-950 > * {
    position: relative;
    z-index: 1;
}

.da-page .bg-stone-950 article {
    border-color: rgba(255, 255, 255, 0.12);
    background:
            linear-gradient(180deg, rgba(255, 255, 255, 0.075), rgba(255, 255, 255, 0.035));
    box-shadow: none;
}

.da-page .bg-stone-950 article:hover {
    border-color: rgba(255, 255, 255, 0.22);
    background:
            linear-gradient(180deg, rgba(255, 255, 255, 0.105), rgba(255, 255, 255, 0.05));
}

/* Conference cards */

#conference article {
    background:
            linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(255, 255, 255, 0.78));
}

#conference article p:first-child {
    color: var(--da-accent);
}

/* Roadmap layer cards */

#roadmap article {
    overflow: hidden;
    background: rgba(255, 255, 255, 0.68);
}

#roadmap article::before {
    content: "";
    position: absolute;
    top: 1.4rem;
    bottom: 1.4rem;
    left: 0;
    width: 3px;
    border-radius: 999px;
    background: linear-gradient(var(--da-accent-soft), var(--da-accent));
}

#roadmap article:hover::before {
    width: 5px;
}

/* Agenda list */

.da-page .overflow-hidden.rounded-\[2rem\] {
    background:
            linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.76));
    box-shadow: var(--da-shadow-md);
}

.da-page .overflow-hidden.rounded-\[2rem\] > div {
    transition:
            background-color 180ms ease,
            transform 180ms ease;
}

.da-page .overflow-hidden.rounded-\[2rem\] > div:hover {
    background: rgba(234, 216, 196, 0.22);
}

/* Cadence cards */

#cadence article {
    background:
            linear-gradient(180deg, rgba(247, 243, 237, 0.9), rgba(255, 255, 255, 0.75));
}

#cadence article p:first-child {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border-radius: 999px;
    color: white;
    background: var(--da-dark);
}

/* Final CTA */

.da-page section:last-of-type .bg-stone-950 {
    box-shadow: var(--da-shadow-lg);
}

/* Footer */

.da-page footer {
    background: rgba(247, 243, 237, 0.72);
    backdrop-filter: blur(14px);
}

/* Accessibility and polish */

.da-page :focus-visible {
    outline: 3px solid rgba(154, 107, 63, 0.42);
    outline-offset: 4px;
    border-radius: 0.75rem;
}

@media (max-width: 900px) {
    .da-page main > section:first-child {
        min-height: auto;
    }

    .da-page main > section:first-child h1 {
        max-width: 12ch;
        font-size: clamp(3.25rem, 15vw, 5rem);
    }

    .da-page main > section:first-child::before {
        top: 3rem;
        right: -8rem;
        width: 30rem;
        opacity: 0.55;
    }
}

@media (max-width: 640px) {
    .da-page header {
        position: sticky;
    }

    .da-page main > section {
        padding-top: 4.5rem;
        padding-bottom: 4.5rem;
    }

    .da-page article,
    .da-page aside {
        border-radius: 1.5rem !important;
    }

    .da-page section h2 {
        font-size: clamp(2.25rem, 10vw, 3.25rem);
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.001ms !important;
    }
}

/* ------------------------------------------------------------
   Dynamic Agility · Exercise Sidebar Navigation
   ------------------------------------------------------------ */

:root {
    --da-ink: #171412;
    --da-ink-soft: #3f3a35;
    --da-muted: #70675f;
    --da-muted-light: #9d9388;
    --da-paper: #f7f3ed;
    --da-paper-soft: #fbf8f3;
    --da-card: rgba(255, 255, 255, 0.78);
    --da-line: rgba(45, 38, 31, 0.13);
    --da-line-strong: rgba(45, 38, 31, 0.24);
    --da-accent: #9a6b3f;
    --da-accent-dark: #6e4728;
    --da-accent-soft: #ead8c4;
    --da-dark: #151312;
    --da-shadow-sm: 0 1px 2px rgba(22, 18, 14, 0.04), 0 8px 24px rgba(22, 18, 14, 0.06);
    --da-shadow-md: 0 18px 60px rgba(22, 18, 14, 0.12);
}

html {
    scroll-behavior: smooth;
}

.da-exercise-page {
    display: grid;
    grid-template-columns: minmax(18rem, 22rem) minmax(0, 1fr);
    min-height: 100vh;
    background:
            radial-gradient(circle at 12% 0%, rgba(154, 107, 63, 0.13), transparent 26rem),
            radial-gradient(circle at 90% 10%, rgba(23, 20, 18, 0.07), transparent 34rem),
            linear-gradient(180deg, var(--da-paper-soft), var(--da-paper));
    color: var(--da-ink);
}

/* Sidebar */

.da-exercise-sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--da-line);
    background:
            linear-gradient(180deg, rgba(255, 255, 255, 0.76), rgba(255, 255, 255, 0.52)),
            rgba(247, 243, 237, 0.9);
    backdrop-filter: blur(18px);
    z-index: 40;
}

.da-sidebar-brand {
    padding: 1.5rem 1.25rem 1rem;
    border-bottom: 1px solid var(--da-line);
}

.da-brand-link {
    display: inline-flex;
    color: var(--da-ink);
    font-size: 0.92rem;
    font-weight: 760;
    letter-spacing: 0.04em;
    text-decoration: none;
}

.da-sidebar-brand p {
    margin: 0.45rem 0 0;
    color: var(--da-muted);
    font-size: 0.78rem;
    line-height: 1.35;
}

.da-sidebar-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 0.85rem;
    scrollbar-width: thin;
    scrollbar-color: rgba(154, 107, 63, 0.35) transparent;
}

.da-nav-group {
    margin-bottom: 0.45rem;
    border: 1px solid transparent;
    border-radius: 1.15rem;
    transition:
            border-color 180ms ease,
            background-color 180ms ease,
            box-shadow 180ms ease;
}

.da-nav-group[open] {
    border-color: var(--da-line);
    background: rgba(255, 255, 255, 0.64);
    box-shadow: var(--da-shadow-sm);
}

.da-nav-group summary {
    display: grid;
    grid-template-columns: 2.1rem 1fr 1rem;
    gap: 0.65rem;
    align-items: center;
    padding: 0.8rem 0.75rem;
    cursor: pointer;
    list-style: none;
    user-select: none;
}

.da-nav-group summary::-webkit-details-marker {
    display: none;
}

.da-nav-number {
    display: inline-flex;
    width: 2.1rem;
    height: 2.1rem;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    background: rgba(234, 216, 196, 0.68);
    color: var(--da-accent-dark);
    font-size: 0.75rem;
    font-weight: 780;
}

.da-nav-title {
    display: grid;
    min-width: 0;
}

.da-nav-title span {
    overflow: hidden;
    color: var(--da-ink);
    font-size: 0.86rem;
    font-weight: 720;
    line-height: 1.2;
    text-overflow: ellipsis;
}

.da-nav-title small {
    margin-top: 0.18rem;
    color: var(--da-muted-light);
    font-size: 0.72rem;
    font-weight: 560;
}

.da-nav-chevron {
    color: var(--da-muted-light);
    font-size: 1.25rem;
    line-height: 1;
    transition: transform 180ms ease;
}

.da-nav-group[open] .da-nav-chevron {
    transform: rotate(90deg);
}

.da-nav-subitems {
    display: grid;
    gap: 0.25rem;
    padding: 0 0.55rem 0.75rem 3.5rem;
}

.da-nav-overview,
.da-nav-subitem {
    color: var(--da-muted);
    text-decoration: none;
    border-radius: 0.8rem;
    transition:
            color 160ms ease,
            background-color 160ms ease,
            transform 160ms ease;
}

.da-nav-overview {
    padding: 0.45rem 0.55rem;
    font-size: 0.76rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.da-nav-subitem {
    display: grid;
    grid-template-columns: 2rem 1fr;
    gap: 0.45rem;
    align-items: center;
    padding: 0.45rem 0.55rem;
}

.da-nav-subitem span {
    color: var(--da-accent);
    font-size: 0.72rem;
    font-weight: 760;
}

.da-nav-subitem strong {
    color: inherit;
    font-size: 0.8rem;
    font-weight: 620;
    line-height: 1.2;
}

.da-nav-overview:hover,
.da-nav-subitem:hover {
    color: var(--da-ink);
    background: rgba(234, 216, 196, 0.42);
    transform: translateX(2px);
}

.da-sidebar-footer {
    padding: 1rem 1.25rem 1.25rem;
    border-top: 1px solid var(--da-line);
}

.da-sidebar-footer a {
    display: block;
    border-radius: 999px;
    background: var(--da-dark);
    color: white;
    padding: 0.8rem 1rem;
    font-size: 0.84rem;
    font-weight: 720;
    text-align: center;
    text-decoration: none;
    transition:
            background-color 180ms ease,
            transform 180ms ease;
}

.da-sidebar-footer a:hover {
    background: var(--da-accent-dark);
    transform: translateY(-1px);
}

/* Main content */

.da-exercise-content {
    min-width: 0;
    padding: 0 2rem 5rem;
}

.da-exercise-content > section {
    scroll-margin-top: 2rem;
}

.da-exercise-hero {
    max-width: 72rem;
    padding: 7rem 0 5rem;
}

.da-overline {
    margin: 0;
    color: var(--da-muted-light);
    font-size: 0.76rem;
    font-weight: 780;
    letter-spacing: 0.26em;
    text-transform: uppercase;
}

.da-exercise-hero h1 {
    max-width: 12ch;
    margin: 1.2rem 0 0;
    color: var(--da-ink);
    font-size: clamp(4rem, 9vw, 8rem);
    font-weight: 760;
    letter-spacing: -0.08em;
    line-height: 0.86;
    text-wrap: balance;
}

.da-lead {
    max-width: 47rem;
    margin: 2rem 0 0;
    color: var(--da-muted);
    font-size: clamp(1.1rem, 1.8vw, 1.45rem);
    line-height: 1.65;
}

.da-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-top: 2.2rem;
}

.da-primary-action,
.da-secondary-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    padding: 0.9rem 1.25rem;
    font-size: 0.9rem;
    font-weight: 740;
    text-decoration: none;
    transition:
            transform 170ms ease,
            background-color 170ms ease,
            border-color 170ms ease;
}

.da-primary-action {
    background: var(--da-dark);
    color: white;
}

.da-secondary-action {
    border: 1px solid var(--da-line-strong);
    color: var(--da-ink);
    background: rgba(255, 255, 255, 0.46);
}

.da-primary-action:hover,
.da-secondary-action:hover {
    transform: translateY(-2px);
}

.da-primary-action:hover {
    background: var(--da-accent-dark);
}

.da-secondary-action:hover {
    border-color: var(--da-accent);
}

/* Principle strip */

.da-principle-strip {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    max-width: 76rem;
    margin-bottom: 5rem;
}

.da-principle-strip article {
    border: 1px solid var(--da-line);
    border-radius: 1.75rem;
    background: rgba(255, 255, 255, 0.62);
    padding: 1.35rem;
    box-shadow: var(--da-shadow-sm);
}

.da-principle-strip span {
    color: var(--da-accent);
    font-size: 0.76rem;
    font-weight: 800;
}

.da-principle-strip h2 {
    margin: 0.8rem 0 0;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
}

.da-principle-strip p {
    margin: 0.5rem 0 0;
    color: var(--da-muted);
    font-size: 0.93rem;
    line-height: 1.55;
}

/* Exercise sections */

.da-exercise-section {
    max-width: 76rem;
    margin: 0 0 4rem;
    padding: 3.2rem;
    border: 1px solid var(--da-line);
    border-radius: 2.4rem;
    background:
            linear-gradient(180deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0.5));
    box-shadow: var(--da-shadow-sm);
}

.da-section-heading {
    max-width: 54rem;
}

.da-section-heading h2 {
    margin: 0.8rem 0 0;
    color: var(--da-ink);
    font-size: clamp(2.4rem, 4vw, 4.8rem);
    line-height: 0.96;
    letter-spacing: -0.06em;
    text-wrap: balance;
}

.da-section-heading > p:not(.da-overline) {
    margin: 1.25rem 0 0;
    color: var(--da-muted);
    font-size: 1.08rem;
    line-height: 1.75;
}

.da-exercise-summary-card {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    align-items: center;
    justify-content: space-between;
    margin-top: 2rem;
    padding: 1rem 1.15rem;
    border: 1px solid rgba(154, 107, 63, 0.18);
    border-radius: 1.25rem;
    background: rgba(234, 216, 196, 0.28);
}

.da-exercise-summary-card span {
    color: var(--da-accent-dark);
    font-size: 0.92rem;
    font-weight: 680;
}

.da-exercise-summary-card strong {
    color: var(--da-ink);
    font-size: 0.82rem;
    font-weight: 780;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.da-exercise-items {
    display: grid;
    gap: 0.8rem;
    margin-top: 2rem;
}

.da-exercise-item {
    display: grid;
    grid-template-columns: 4.5rem 1fr;
    gap: 1rem;
    align-items: start;
    padding: 1.25rem;
    border: 1px solid var(--da-line);
    border-radius: 1.5rem;
    background: rgba(255, 255, 255, 0.7);
    transition:
            transform 180ms ease,
            border-color 180ms ease,
            box-shadow 180ms ease,
            background-color 180ms ease;
    scroll-margin-top: 2rem;
}

.da-exercise-item:hover {
    transform: translateY(-2px);
    border-color: rgba(154, 107, 63, 0.34);
    background: rgba(255, 255, 255, 0.92);
    box-shadow: var(--da-shadow-sm);
}

.da-item-label span {
    display: inline-flex;
    width: 3rem;
    height: 3rem;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    background: var(--da-dark);
    color: white;
    font-size: 0.86rem;
    font-weight: 800;
}

.da-item-body h3 {
    margin: 0;
    color: var(--da-ink);
    font-size: 1.35rem;
    line-height: 1.15;
    letter-spacing: -0.03em;
}

.da-item-body p {
    max-width: 47rem;
    margin: 0.65rem 0 0;
    color: var(--da-muted);
    line-height: 1.65;
}

.da-item-output {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    align-items: center;
    margin-top: 1rem;
    border-radius: 999px;
    background: rgba(247, 243, 237, 0.86);
    padding: 0.45rem 0.75rem;
}

.da-item-output span {
    color: var(--da-muted-light);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.09em;
    text-transform: uppercase;
}

.da-item-output strong {
    color: var(--da-accent-dark);
    font-size: 0.84rem;
    font-weight: 760;
}

/* Closing panel */

.da-closing-panel {
    max-width: 76rem;
    margin: 0 0 4rem;
    padding: 3rem;
    border-radius: 2.3rem;
    background:
            radial-gradient(circle at 12% 10%, rgba(154, 107, 63, 0.42), transparent 20rem),
            linear-gradient(135deg, #151312, #24201d);
    color: white;
    box-shadow: var(--da-shadow-md);
}

.da-closing-panel h2 {
    max-width: 16ch;
    margin: 1rem 0 0;
    font-size: clamp(2.5rem, 5vw, 5rem);
    line-height: 0.96;
    letter-spacing: -0.06em;
}

.da-closing-panel p:not(.da-overline) {
    max-width: 42rem;
    margin: 1.25rem 0 0;
    color: rgba(255, 255, 255, 0.72);
    font-size: 1.05rem;
    line-height: 1.7;
}

.da-closing-panel a {
    display: inline-flex;
    margin-top: 2rem;
    border-radius: 999px;
    background: white;
    color: var(--da-ink);
    padding: 0.9rem 1.2rem;
    font-size: 0.9rem;
    font-weight: 780;
    text-decoration: none;
}

/* Focus states */

.da-exercise-page :focus-visible {
    outline: 3px solid rgba(154, 107, 63, 0.42);
    outline-offset: 4px;
    border-radius: 0.75rem;
}

/* Responsive */

@media (max-width: 1100px) {
    .da-exercise-page {
        grid-template-columns: 1fr;
    }

    .da-exercise-sidebar {
        position: sticky;
        top: 0;
        height: auto;
        max-height: 82vh;
        border-right: 0;
        border-bottom: 1px solid var(--da-line);
    }

    .da-sidebar-scroll {
        max-height: 54vh;
    }

    .da-sidebar-footer {
        display: none;
    }

    .da-exercise-content {
        padding: 0 1.25rem 4rem;
    }

    .da-exercise-hero {
        padding-top: 4rem;
    }

    .da-principle-strip {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 720px) {
    .da-sidebar-brand {
        padding: 1rem;
    }

    .da-sidebar-scroll {
        padding: 0.65rem;
    }

    .da-exercise-hero h1 {
        font-size: clamp(3.2rem, 18vw, 5rem);
    }

    .da-exercise-section {
        padding: 1.35rem;
        border-radius: 1.6rem;
    }

    .da-exercise-item {
        grid-template-columns: 1fr;
    }

    .da-item-label span {
        width: 2.5rem;
        height: 2.5rem;
    }

    .da-closing-panel {
        padding: 1.5rem;
        border-radius: 1.6rem;
    }
}

/* ------------------------------------------------------------
   Dynamic Agility · Blue theme + playful hero refinement
   ------------------------------------------------------------ */

:root {
    --da-ink: #0b1220;
    --da-ink-soft: #1e2f4a;
    --da-muted: #54677f;
    --da-muted-light: #7f96ad;

    --da-paper: #eef8ff;
    --da-paper-soft: #f7fcff;
    --da-card: rgba(255, 255, 255, 0.78);

    --da-line: rgba(37, 99, 235, 0.14);
    --da-line-strong: rgba(37, 99, 235, 0.26);

    --da-accent: #2563eb;
    --da-accent-dark: #1d4ed8;
    --da-accent-soft: #bfdbfe;

    --da-sky: #38bdf8;
    --da-sky-soft: #e0f2fe;

    --da-dark: #071426;
    --da-dark-2: #0f2744;
}

.da-exercise-page {
    background:
            radial-gradient(circle at 12% 0%, rgba(56, 189, 248, 0.22), transparent 28rem),
            radial-gradient(circle at 90% 10%, rgba(37, 99, 235, 0.16), transparent 36rem),
            linear-gradient(180deg, #f7fcff, #eef8ff);
}

.da-exercise-sidebar {
    background:
            linear-gradient(180deg, rgba(255, 255, 255, 0.82), rgba(239, 248, 255, 0.72)),
            rgba(239, 248, 255, 0.94);
}

.da-nav-number {
    background: linear-gradient(135deg, #dbeafe, #bae6fd);
    color: #1d4ed8;
}

.da-nav-group[open] {
    border-color: rgba(37, 99, 235, 0.18);
    background: rgba(255, 255, 255, 0.72);
}

.da-nav-overview:hover,
.da-nav-subitem:hover {
    background: rgba(186, 230, 253, 0.42);
}

.da-nav-subitem span {
    color: #2563eb;
}

.da-sidebar-footer a,
.da-primary-action,
.da-item-label span {
    background: linear-gradient(135deg, #2563eb, #0284c7);
}

.da-sidebar-footer a:hover,
.da-primary-action:hover {
    background: linear-gradient(135deg, #1d4ed8, #0369a1);
}

.da-secondary-action:hover {
    border-color: #38bdf8;
}

.da-exercise-hero {
    position: relative;
    padding-top: 5.5rem;
    padding-bottom: 4.25rem;
}

.da-exercise-hero::before {
    content: "";
    position: absolute;
    top: 4.5rem;
    right: 7%;
    z-index: -1;
    width: min(27rem, 52vw);
    aspect-ratio: 1;
    border-radius: 999px;
    background:
            radial-gradient(circle at 40% 38%, rgba(255, 255, 255, 0.95), transparent 22%),
            radial-gradient(circle at 52% 48%, rgba(186, 230, 253, 0.92), transparent 44%),
            radial-gradient(circle at 72% 70%, rgba(37, 99, 235, 0.16), transparent 62%);
    filter: blur(1px);
}

.da-playful-hero-title {
    display: grid;
    gap: 0.35rem;
    max-width: 15ch !important;
    margin: 1.1rem 0 0;
    color: var(--da-ink);
    font-size: clamp(2.7rem, 6.2vw, 5.25rem) !important;
    font-weight: 760;
    line-height: 0.96 !important;
    letter-spacing: -0.055em !important;
    text-wrap: balance;
}

.da-playful-hero-title span {
    display: inline-block;
    width: fit-content;
    transform: rotate(-1.2deg);
    color: #2563eb;
    font-size: 0.48em;
    font-weight: 780;
    letter-spacing: -0.025em;
    line-height: 1;
    background:
            linear-gradient(90deg, rgba(191, 219, 254, 0.95), rgba(224, 242, 254, 0.6));
    border: 1px solid rgba(37, 99, 235, 0.14);
    border-radius: 999px;
    padding: 0.23em 0.48em 0.28em;
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.12);
}

.da-playful-hero-title strong {
    display: block;
    max-width: 12ch;
    font: inherit;
    font-weight: 760;
    background: linear-gradient(135deg, #0b1220 0%, #1d4ed8 52%, #38bdf8 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.da-principle-strip article,
.da-exercise-section,
.da-source-deck-card {
    border-color: rgba(37, 99, 235, 0.14);
}

.da-exercise-summary-card {
    border-color: rgba(37, 99, 235, 0.18);
    background: linear-gradient(135deg, rgba(219, 234, 254, 0.58), rgba(224, 242, 254, 0.44));
}

.da-exercise-summary-card span,
.da-item-output strong {
    color: #1d4ed8;
}

.da-item-output {
    background: rgba(224, 242, 254, 0.72);
}

.da-exercise-item:hover {
    border-color: rgba(37, 99, 235, 0.34);
}

.da-closing-panel {
    background:
            radial-gradient(circle at 12% 10%, rgba(56, 189, 248, 0.34), transparent 20rem),
            linear-gradient(135deg, #071426, #0f2744);
}

/* Static sidebar link for source decks */

.da-nav-static-link {
    display: grid;
    grid-template-columns: 2.1rem 1fr;
    gap: 0.65rem;
    align-items: center;
    margin: 0 0 0.65rem;
    padding: 0.8rem 0.75rem;
    border: 1px solid rgba(37, 99, 235, 0.16);
    border-radius: 1.15rem;
    background:
            linear-gradient(135deg, rgba(219, 234, 254, 0.86), rgba(224, 242, 254, 0.62));
    color: var(--da-ink);
    text-decoration: none;
    box-shadow: var(--da-shadow-sm);
    transition:
            transform 160ms ease,
            border-color 160ms ease,
            background-color 160ms ease;
}

.da-nav-static-link:hover {
    transform: translateX(2px);
    border-color: rgba(37, 99, 235, 0.32);
}

.da-nav-static-link span {
    display: inline-flex;
    width: 2.1rem;
    height: 2.1rem;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    background: #2563eb;
    color: white;
    font-size: 0.68rem;
    font-weight: 820;
    text-transform: uppercase;
}

.da-nav-static-link strong {
    color: var(--da-ink);
    font-size: 0.86rem;
    font-weight: 760;
}

/* Source deck section */

.da-source-decks-section {
    max-width: 76rem;
    margin: 0 0 5rem;
    padding: 3rem;
    border: 1px solid rgba(37, 99, 235, 0.14);
    border-radius: 2.4rem;
    background:
            radial-gradient(circle at 8% 8%, rgba(56, 189, 248, 0.18), transparent 24rem),
            linear-gradient(180deg, rgba(255, 255, 255, 0.74), rgba(255, 255, 255, 0.54));
    box-shadow: var(--da-shadow-sm);
    scroll-margin-top: 2rem;
}

.da-source-heading {
    max-width: 48rem;
}

.da-source-decks-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.da-source-deck-card {
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(37, 99, 235, 0.14);
    border-radius: 1.75rem;
    background:
            linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(239, 248, 255, 0.76));
    padding: 1.5rem;
    transition:
            transform 180ms ease,
            border-color 180ms ease,
            box-shadow 180ms ease;
}

.da-source-deck-card::before {
    content: "";
    position: absolute;
    top: 0;
    right: 1.5rem;
    left: 1.5rem;
    height: 3px;
    border-radius: 999px;
    background: linear-gradient(90deg, #2563eb, #38bdf8);
}

.da-source-deck-card:hover {
    transform: translateY(-3px);
    border-color: rgba(37, 99, 235, 0.34);
    box-shadow: var(--da-shadow-md);
}

.da-deck-label {
    display: inline-flex;
    border-radius: 999px;
    background: rgba(219, 234, 254, 0.86);
    color: #1d4ed8;
    padding: 0.35rem 0.65rem;
    font-size: 0.72rem;
    font-weight: 820;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.da-source-deck-card h3 {
    margin: 1rem 0 0;
    color: var(--da-ink);
    font-size: 1.45rem;
    line-height: 1.15;
    letter-spacing: -0.035em;
}

.da-source-deck-card p {
    margin: 0.8rem 0 0;
    color: var(--da-muted);
    line-height: 1.65;
}

.da-source-deck-card a {
    display: inline-flex;
    margin-top: 1.2rem;
    border-radius: 999px;
    background: #2563eb;
    color: white;
    padding: 0.72rem 1rem;
    font-size: 0.84rem;
    font-weight: 760;
    text-decoration: none;
    transition:
            transform 160ms ease,
            background-color 160ms ease;
}

.da-source-deck-card a:hover {
    transform: translateY(-1px);
    background: #1d4ed8;
}

@media (max-width: 720px) {
    .da-playful-hero-title {
        font-size: clamp(2.5rem, 14vw, 4rem) !important;
    }

    .da-source-decks-section {
        padding: 1.35rem;
        border-radius: 1.6rem;
    }

    .da-source-decks-grid {
        grid-template-columns: 1fr;
    }
}