/* ==========================================================================
   ifengine_leptos - Story Presentation Stylesheet
   Inspired by Saltwrack / Chapbook typography and minimal dark layout.
   ========================================================================== */

:root {
    --color-backdrop: #1A1B1D;
    --color-page-bg: #1A1B1D;
    --color-text: #F1F3F5;
    --color-text-dim: #ADB5BD;
    --color-text-muted: #868E96;
    --color-link: #F1F3F5;
    --color-link-hover: #FFFFFF;
    --color-link-active: #CED4DA;
    --color-border: #2C2E33;
    --font-serif: "Iowan Old Style", "Constantia", "Georgia", "Cambria", "Times New Roman", serif;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    --page-width: 44rem;

    /* Page transitions */
    --page-transition-out-duration: 0.3s;
    --page-transition-out-timing: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --page-transition-in-duration: 0.2s;
    --page-transition-in-timing: linear;

    /* Element transitions for same-id elements (e.g. alts!) */
    --element-transition-out-duration: 0.3s;
    --element-transition-out-timing: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --element-transition-in-duration: 0.2s;
    --element-transition-in-timing: linear;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    background-color: var(--color-backdrop);
    color: var(--color-text);
    font-family: var(--font-serif);
    font-size: 19px;
    line-height: 1.75;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   Layout & Container
   -------------------------------------------------------------------------- */

#backdrop {
    display: flex;
    justify-content: center;
    align-items: stretch;
    min-height: 100vh;
    width: 100%;
    background-color: var(--color-backdrop);
}

#page {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: var(--page-width);
    min-height: 100vh;
    padding: 3.5rem 2rem 0.5rem;
    position: relative;
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.passage-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    min-height: 1.2rem;
    margin-bottom: 2.1rem;
    transition: border-color 0.2s ease;
}

.header-has-content {
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.5rem;
}

.header-empty {
    display: none !important;
    min-height: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
    border: none !important;
}

.header-section {
    flex: 1;
}

.header-left {
    text-align: left;
}

.header-center {
    text-align: center;
}

.header-right {
    text-align: right;
}

/* --------------------------------------------------------------------------
   Article & Passage Content
   -------------------------------------------------------------------------- */

.passage-article {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.passage-paragraph {
    margin-top: 0;
    margin-bottom: 1.35rem;
    word-break: break-word;
}

.passage-paragraph:has(> .passage-line:empty),
.passage-paragraph:has(> .passage-line.delayed-hidden),
.passage-paragraph:has(> .passage-line.fade-out-removed),
.passage-text:has(> .passage-line.delayed-hidden),
.passage-text:has(> .passage-line.fade-out-removed) {
    margin: 0 !important;
    padding: 0 !important;
    min-height: 0 !important;
    height: 0 !important;
}

.passage-text {
    margin-bottom: 1rem;
}

.passage-embed {
    display: block;
    margin: 0.5rem 0;
}

.passage-line {
    display: inline;
}

/* --------------------------------------------------------------------------
   Headings
   -------------------------------------------------------------------------- */

.passage-heading {
    color: #FFFFFF;
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: 0.04em;
    margin-top: 1.8rem;
    margin-bottom: 0.8rem;
}

h1.passage-heading { font-size: 2.1rem; }
h2.passage-heading { font-size: 1.7rem; }
h3.passage-heading { font-size: 1.4rem; letter-spacing: 0.08em; text-transform: uppercase; }
h4.passage-heading { font-size: 1.2rem; }
h5.passage-heading { font-size: 1.05rem; }
h6.passage-heading { font-size: 0.95rem; text-transform: uppercase; color: var(--color-text-dim); }

/* --------------------------------------------------------------------------
   Links & Interactivity
   -------------------------------------------------------------------------- */

.passage-link {
    color: var(--color-link);
    text-decoration: underline;
    text-underline-offset: 3px;
    cursor: pointer;
    background: none;
    border: none;
    font: inherit;
    padding: 0;
    display: inline;
    transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

.passage-link:hover,
.passage-link:focus {
    color: var(--color-link-hover);
    text-decoration-color: var(--color-link-hover);
}

.passage-link:active {
    color: var(--color-link-active);
}

.passage-link-static {
    color: var(--color-link);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.variant-muted {
    color: var(--color-text-muted);
}

.variant-secondary {
    color: var(--color-text-dim);
}

/* --------------------------------------------------------------------------
   Layout Utilities
   -------------------------------------------------------------------------- */

.center,
.text-center {
    display: block;
    text-align: center;
}

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

.choice-container {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    margin: 1.5rem 0;
}

.choice-item {
    font-family: inherit;
    font-size: inherit;
    color: var(--color-text);
    text-align: left;
    line-height: 1.6;
    background: transparent;
    border: none;
}

.choice-button {
    cursor: pointer;
    width: 100%;
    background: none;
    border: none;
    padding: 0;
    font: inherit;
    color: var(--color-link);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color 0.15s ease;
}

.choice-button:hover,
.choice-button:focus {
    color: var(--color-link-hover);
}

.choice-button:active {
    color: var(--color-link-active);
}

.choice-item-inline {
    border-left: none;
    background: transparent;
    padding-left: 0;
}

/* --------------------------------------------------------------------------
   Media, Quotes, Breaks, Empties
   -------------------------------------------------------------------------- */

.passage-image-wrapper {
    margin: 1.5rem 0;
    text-align: center;
}

.passage-image {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.image-action-button {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.passage-break {
    border: none;
    text-align: center;
    margin: 2.25rem 0;
}

.passage-break::after {
    content: "*  *  *";
    display: block;
    color: var(--color-text-muted);
    letter-spacing: 0.4em;
    font-size: 1.1rem;
}

.passage-empty {
    width: 100%;
}

.passage-quote {
    margin: 1.5rem 0;
    padding: 0.6rem 1.5rem;
    border-left: 3px solid var(--color-border);
    background: rgba(255, 255, 255, 0.02);
    font-style: italic;
    color: #CED4DA;
}

.passage-note {
    margin: 1rem 0;
    padding: 0.75rem 1.25rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px dashed var(--color-border);
    border-radius: 4px;
    font-size: 0.95rem;
    color: var(--color-text-dim);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.passage-footer {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    margin-top: auto;
    padding-top: 0.5rem;
    padding-bottom: 0.25rem;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    font-family: var(--font-sans);
    font-size: 0.65rem;
    line-height: 1.2;
    letter-spacing: 0.04em;
    color: rgba(255, 255, 255, 0.25);
}

.footer-attribution-link {
    color: inherit;
    text-decoration: none;
    opacity: 0.6;
    transition: opacity 0.15s ease, color 0.15s ease;
}

.footer-attribution-link:hover {
    opacity: 1;
    color: var(--color-text-dim);
    text-decoration: underline;
}

/* --------------------------------------------------------------------------
   Transitions & Keyframe Animations
   -------------------------------------------------------------------------- */

@keyframes fade-in {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

@keyframes fade-out {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}

.skip-animation {
    animation: none !important;
    animation-duration: 0s !important;
    animation-delay: 0s !important;
}

.delayed-hidden {
    display: none !important;
    margin: 0 !important;
    padding: 0 !important;
}

.fade-out-removed {
    display: none !important;
    margin: 0 !important;
    padding: 0 !important;
}

.transition-active {
    will-change: opacity;
}

/* --------------------------------------------------------------------------
   Page Transitions (Traditional DOM Swap & CSS Keyframe Model)
   -------------------------------------------------------------------------- */

.page-fade-out {
    animation: fade-out var(--page-transition-out-duration, 0.3s) var(--page-transition-out-timing, cubic-bezier(0.25, 0.46, 0.45, 0.94)) both;
    pointer-events: none;
}

.page-fade-in {
    animation: fade-in var(--page-transition-in-duration, 0.2s) var(--page-transition-in-timing, linear) both;
}

/* --------------------------------------------------------------------------
   View Transitions API
   -------------------------------------------------------------------------- */

/* Suppress viewport/root level view transitions */
html, :root {
    color-scheme: dark;
    view-transition-name: none;
}

/* Ensure background does not block page content during transitions */
::view-transition {
    background-color: transparent;
}

/* Element transitions for same-id elements (e.g. alts!, choice morphing) */
::view-transition-group(*) {
    animation-duration: calc(var(--element-transition-out-duration, 0.3s) + var(--element-transition-in-duration, 0.2s));
    animation-timing-function: var(--element-transition-out-timing, cubic-bezier(0.25, 0.46, 0.45, 0.94));
}

::view-transition-old(*),
::view-transition-new(*) {
    mix-blend-mode: normal !important;
    object-fit: none !important;
    object-position: top left !important;
    height: 100% !important;
}

/* Unchanged elements during same-page reflow: hide old snapshot and keep single new element with solid opacity */
::view-transition-old(.reflow) {
    display: none !important;
    animation: none !important;
    opacity: 0 !important;
}

::view-transition-new(.reflow) {
    animation: none !important;
    opacity: 1 !important;
}

/* Changed elements (e.g. alts!, choices collapsing to replacement line):
   Fade out with quadratic easing (0.3s), fade in with linear easing (0.2s) after 0.3s delay */
::view-transition-old(.fade),
::view-transition-old(*):only-child {
    animation: fade-out var(--element-transition-out-duration, 0.3s) var(--element-transition-out-timing, cubic-bezier(0.25, 0.46, 0.45, 0.94)) both;
}

::view-transition-new(.fade),
::view-transition-new(*):only-child {
    animation: fade-in var(--element-transition-in-duration, 0.2s) var(--element-transition-in-timing, linear) var(--element-transition-out-duration, 0.3s) both;
}

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

@media screen and (max-width: 768px) {
    #page {
        padding: 2rem 1.25rem 0.5rem;
    }

    html, body {
        font-size: 17.5px;
    }

    .choice-item {
        padding: 0.8rem 1.1rem;
    }
}