/**
 * SUNOSUNAO — CINEMATIC LAYOUT SYSTEM
 * Design Version: 2.0
 * File: public_html/assets/css/layout.css
 *
 * PURPOSE
 * -------
 * Structural layout foundation for SunoSunao.
 *
 * RESPONSIBILITIES
 * ----------------
 * Page structure
 * Header structure
 * Hero structure
 * Section structure
 * Story rails and grids
 * Discovery layouts
 * Audio cinema structure
 * Immersive experience structure
 * Creator and membership layouts
 * Footer structure
 * Modal and drawer geometry
 * Reading layouts
 * Player shell
 *
 * DEPENDS ON
 * ----------
 * core.css
 *
 * DOES NOT OWN
 * ------------
 * Brand tokens
 * Component skinning
 * Story-specific content
 * Backend logic
 * JavaScript behavior
 */


/* =========================================================
   01. PAGE FOUNDATION
   ========================================================= */

.page {
    position: relative;
    width: 100%;
    min-height: 100vh;
    overflow-x: clip;
}

.page__main {
    position: relative;
    min-width: 0;
}

.page__section {
    position: relative;
    width: 100%;
    padding-block: var(--section-padding);
}

.page__section--compact {
    padding-block: var(--space-12);
}

.page__section--large {
    padding-block: var(--space-24);
}

.page__section--flush {
    padding-block: 0;
}

.page__section--dark {
    background: var(--color-bg-primary);
}

.page__section--soft {
    background: var(--color-bg-secondary);
}

.page__section--elevated {
    background: var(--color-surface-raised);
}


/* =========================================================
   02. CONTAINERS
   ========================================================= */

.container {
    position: relative;
    width: min(
        calc(100% - (2 * var(--page-padding))),
        var(--content-max)
    );
    margin-inline: auto;
}

.container--wide {
    width: min(
        calc(100% - (2 * var(--page-padding))),
        var(--content-wide)
    );
}

.container--narrow {
    width: min(
        calc(100% - (2 * var(--page-padding))),
        var(--content-narrow)
    );
}

.container--full {
    width: 100%;
    max-width: none;
}

.container--fluid {
    width: calc(100% - (2 * var(--page-padding)));
    max-width: none;
}


/* =========================================================
   03. STACKS
   ========================================================= */

.stack {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.stack--sm {
    gap: var(--space-2);
}

.stack--md {
    gap: var(--space-4);
}

.stack--lg {
    gap: var(--space-8);
}

.stack--xl {
    gap: var(--space-10);
}


/* =========================================================
   04. CLUSTERS
   ========================================================= */

.cluster {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-3);
}

.cluster--tight {
    gap: var(--space-2);
}

.cluster--large {
    gap: var(--space-5);
}

.cluster--between {
    justify-content: space-between;
}


/* =========================================================
   05. SITE SHELL
   ========================================================= */

.site {
    position: relative;
    display: flex;
    flex-direction: column;
    width: 100%;
    min-height: 100vh;
}

.site__header {
    position: relative;
    z-index: var(--z-header);
}

.site__main {
    position: relative;
    flex: 1 1 auto;
    min-width: 0;
}

.site__footer {
    position: relative;
    z-index: var(--z-content);
}


/* =========================================================
   06. SITE HEADER
   ========================================================= */

.site-header {
    position: relative;
    z-index: var(--z-header);
    width: 100%;
}

.site-header--overlay {
    position: absolute;
    inset: 0 0 auto;
}

.site-header__inner {
    position: relative;
    display: flex;
    align-items: center;
    width: min(
        calc(100% - (2 * var(--page-padding))),
        var(--content-max)
    );
    min-height: var(--header-height);
    margin-inline: auto;
}

.site-header__brand {
    display: inline-flex;
    align-items: center;
    flex: 0 0 auto;
}

.site-header__brand a {
    display: inline-flex;
    align-items: center;
}

.site-header__logo {
    display: block;
    width: auto;
    max-width: 100%;
    height: auto;
}

.site-header__navigation {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    margin-inline: auto;
}

.site-header__navigation a {
    display: inline-flex;
    align-items: center;
    min-height: var(--touch-target-min);
}

.site-header__actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-2);
    flex: 0 0 auto;
}

.site-header__search {
    min-width: 0;
}

.site-header__mobile-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: var(--touch-target-min);
    height: var(--touch-target-min);
    flex: 0 0 var(--touch-target-min);
}


/* =========================================================
   07. HERO
   ========================================================= */

.hero {
    position: relative;
    display: flex;
    align-items: flex-end;
    min-height: min(780px, 88svh);
    overflow: hidden;
    isolation: isolate;
}

.hero--compact {
    min-height: min(560px, 70svh);
}

.hero--full {
    min-height: 100svh;
}

.hero__media {
    position: absolute;
    inset: 0;
    z-index: var(--z-base);
    overflow: hidden;
}

.hero__media img,
.hero__media video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.hero__backdrop {
    position: absolute;
    inset: 0;
    z-index: calc(var(--z-base) + 1);
    overflow: hidden;
}

.hero__backdrop img,
.hero__backdrop video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero__content {
    position: relative;
    z-index: var(--z-content);
    width: min(
        calc(100% - (2 * var(--page-padding))),
        var(--content-max)
    );
    margin-inline: auto;
    padding-block: var(--space-20);
}

.hero__content-inner {
    max-width: 760px;
}

.hero__eyebrow {
    margin-bottom: var(--space-3);
}

.hero__title {
    max-width: 950px;
}

.hero__description {
    max-width: 680px;
    margin-top: var(--space-5);
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-3);
    margin-top: var(--space-6);
}


/* =========================================================
   08. SECTION HEADER
   ========================================================= */

.section-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.section-header__content {
    min-width: 0;
}

.section-header__title {
    margin: 0;
}

.section-header__description {
    max-width: 680px;
    margin-top: var(--space-2);
}

.section-header__action {
    flex: 0 0 auto;
}


/* =========================================================
   09. STORY RAIL
   ========================================================= */

.story-rail {
    position: relative;
    width: 100%;
}

.story-rail__viewport {
    width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
    overscroll-behavior-inline: contain;
}

.story-rail__viewport::-webkit-scrollbar {
    display: none;
}

.story-rail__track {
    display: flex;
    align-items: stretch;
    gap: var(--space-5);
    width: max-content;
}

.story-rail__item {
    position: relative;
    flex: 0 0 auto;
}

.story-rail--portrait .story-rail__item {
    width: clamp(150px, 16vw, 220px);
}

.story-rail--wide .story-rail__item {
    width: clamp(260px, 28vw, 430px);
}


/* =========================================================
   10. STORY GRID
   ========================================================= */

.story-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-6);
}

.story-grid--three {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.story-grid--dense {
    gap: var(--space-4);
}

.story-grid__item {
    min-width: 0;
}


/* =========================================================
   11. DISCOVERY
   ========================================================= */

.discovery {
    position: relative;
}

.discovery__header {
    margin-bottom: var(--space-8);
}

.discovery__search {
    width: 100%;
    margin-bottom: var(--space-6);
}

.discovery__filters {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
}

.discovery__content {
    margin-top: var(--space-8);
}

.discovery__grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-6);
}


/* =========================================================
   12. MOOD DISCOVERY
   ========================================================= */

.mood-discovery {
    position: relative;
}

.mood-discovery__grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-5);
}


/* =========================================================
   13. CONTINUE WORLD
   ========================================================= */

.continue-world {
    position: relative;
}

.continue-world__grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-5);
}

.continue-world__item {
    min-width: 0;
}


/* =========================================================
   14. AUDIO CINEMA
   ========================================================= */

.audio-cinema {
    position: relative;
    display: grid;
    grid-template-columns:
        minmax(0, 1fr)
        minmax(320px, 0.72fr);
    gap: var(--space-10);
    min-height: 600px;
    overflow: hidden;
    isolation: isolate;
}

.audio-cinema__background {
    position: absolute;
    inset: 0;
    z-index: var(--z-base);
}

.audio-cinema__background img,
.audio-cinema__background video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.audio-cinema__overlay {
    position: absolute;
    inset: 0;
    z-index: calc(var(--z-base) + 1);
    pointer-events: none;
}

.audio-cinema__content {
    position: relative;
    z-index: var(--z-content);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    min-width: 0;
    padding: var(--space-12);
}

.audio-cinema__player {
    position: relative;
    z-index: var(--z-content);
    align-self: end;
    width: 100%;
    max-width: 980px;
}

.audio-cinema__visualizer {
    position: relative;
    z-index: calc(var(--z-base) + 2);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 360px;
}

.audio-cinema__controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-3);
}

.audio-cinema__timeline {
    width: 100%;
}

.audio-cinema__progress {
    position: relative;
    width: 100%;
}


/* =========================================================
   15. IMMERSIVE EXPERIENCE
   ========================================================= */

.experience {
    position: relative;
    min-height: 100svh;
    overflow: hidden;
    isolation: isolate;
    background: var(--color-black);
}

.experience__scene {
    position: absolute;
    inset: 0;
    z-index: var(--z-base);
}

.experience__scene img,
.experience__scene video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.experience__atmosphere {
    position: absolute;
    inset: 0;
    z-index: calc(var(--z-base) + 1);
    pointer-events: none;
}

.experience__interface {
    position: relative;
    z-index: var(--z-content);
    display: flex;
    flex-direction: column;
    min-height: 100svh;
}

.experience__topbar,
.experience__bottombar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 64px;
    padding:
        var(--space-4)
        var(--page-padding);
}

.experience__center {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1 1 auto;
    min-height: 0;
    padding: var(--space-8);
}

.experience__progress {
    width: 100%;
}

.experience__controls {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}


/* =========================================================
   16. STORY INFORMATION
   ========================================================= */

.story-dna {
    display: grid;
    grid-template-columns:
        minmax(0, 1.5fr)
        minmax(240px, 0.8fr);
    gap: var(--space-10);
}

.story-dna__content,
.story-dna__meta {
    min-width: 0;
}

.story-dna__meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}


/* =========================================================
   17. FEATURE SPLIT
   ========================================================= */

.feature-split {
    display: grid;
    grid-template-columns:
        minmax(0, 1fr)
        minmax(0, 1fr);
    gap: var(--space-10);
    align-items: center;
}

.feature-split__content,
.feature-split__visual {
    min-width: 0;
}

.feature-split__visual {
    overflow: hidden;
}

.feature-split__visual img,
.feature-split__visual video {
    width: 100%;
    height: auto;
}


/* =========================================================
   18. CREATOR
   ========================================================= */

.creator-layout {
    display: grid;
    grid-template-columns:
        minmax(0, 1fr)
        minmax(0, 1fr);
    gap: var(--space-10);
    align-items: center;
}

.creator-layout__content,
.creator-layout__visual {
    min-width: 0;
}

.creator-layout__visual img,
.creator-layout__visual video {
    width: 100%;
    height: auto;
}


/* =========================================================
   19. MEMBERSHIP
   ========================================================= */

.membership {
    position: relative;
}

.membership__content {
    max-width: 820px;
}


/* =========================================================
   20. CTA
   ========================================================= */

.cta-section {
    position: relative;
}

.cta-section__inner {
    display: grid;
    grid-template-columns:
        minmax(0, 1fr)
        auto;
    align-items: center;
    gap: var(--space-8);
}

.cta-section__content {
    min-width: 0;
}

.cta-section__actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-3);
}


/* =========================================================
   21. FOOTER STRUCTURE
   ========================================================= */

.site-footer {
    position: relative;
    width: 100%;
}

.site-footer__top {
    display: grid;
    grid-template-columns:
        minmax(180px, 0.8fr)
        minmax(0, 2fr);
    gap: var(--space-12);
}

.site-footer__brand {
    min-width: 0;
}

.site-footer__columns {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-8);
}

.site-footer__column {
    min-width: 0;
}

.site-footer__links {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.site-footer__bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-5);
    margin-top: var(--space-10);
    padding-top: var(--space-5);
    border-top: 1px solid var(--color-border-subtle);
}

.site-footer__legal,
.site-footer__social {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-3);
}


/* =========================================================
   22. OVERLAY
   ========================================================= */

.overlay {
    position: fixed;
    inset: 0;
    z-index: var(--z-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--page-padding);
    overflow-y: auto;
    background: var(--overlay-black-heavy);
}

.overlay[hidden] {
    display: none;
}

.overlay__content {
    position: relative;
    width: min(100%, 760px);
    max-height: calc(100svh - (2 * var(--page-padding)));
    overflow-y: auto;
}

.overlay--wide .overlay__content {
    width: min(100%, 1100px);
}

.overlay--fullscreen {
    padding: 0;
}

.overlay--fullscreen .overlay__content {
    width: 100%;
    max-width: none;
    max-height: none;
    min-height: 100svh;
}


/* =========================================================
   23. MODAL
   ========================================================= */

.modal {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--page-padding);
    overflow-y: auto;
}

.modal[hidden],
.modal[aria-hidden="true"] {
    display: none;
}

.modal__content {
    position: relative;
    width: min(100%, 760px);
    max-height: calc(100svh - (2 * var(--page-padding)));
    overflow-y: auto;
}


/* =========================================================
   24. DRAWER
   ========================================================= */

.drawer {
    position: fixed;
    inset: 0;
    z-index: var(--z-overlay);
    visibility: hidden;
    pointer-events: none;
}

.drawer__backdrop {
    position: absolute;
    inset: 0;
    opacity: 0;
    background: var(--overlay-black-heavy);
}

.drawer__panel {
    position: absolute;
    top: 0;
    bottom: 0;
    width: min(90vw, 420px);
    overflow-y: auto;
    pointer-events: auto;
}

.drawer--left .drawer__panel {
    left: 0;
}

.drawer--right .drawer__panel {
    right: 0;
}

.drawer.is-open,
.drawer[data-state="open"],
.drawer[aria-hidden="false"] {
    visibility: visible;
    pointer-events: auto;
}


/* =========================================================
   25. PAGE TRANSITION
   ========================================================= */

.page-transition {
    position: fixed;
    inset: 0;
    z-index: var(--z-max);
    visibility: hidden;
    pointer-events: none;
}

.page-transition.is-active,
.page-transition[data-state="active"] {
    visibility: visible;
}


/* =========================================================
   26. FULL BLEED
   ========================================================= */

.full-bleed {
    width: 100%;
}

.full-bleed--viewport {
    width: 100vw;
    margin-inline: calc(50% - 50vw);
}


/* =========================================================
   27. CONTENT LAYOUT
   ========================================================= */

.content-layout {
    display: grid;
    grid-template-columns:
        minmax(0, 1fr)
        minmax(220px, 320px);
    gap: var(--space-10);
    align-items: start;
}

.content-layout__main,
.content-layout__aside {
    min-width: 0;
}

.content-layout__aside {
    position: sticky;
    top: calc(var(--header-height) + var(--space-5));
}


/* =========================================================
   28. READING LAYOUT
   ========================================================= */

.reading-layout {
    display: grid;
    grid-template-columns:
        minmax(0, 1fr)
        minmax(220px, 300px);
    gap: var(--space-12);
    align-items: start;
}

.reading-layout__content {
    min-width: 0;
    max-width: var(--content-narrow);
}

.reading-layout__text {
    max-width: 760px;
}

.reading-layout__aside {
    position: sticky;
    top: calc(var(--header-height) + var(--space-5));
    min-width: 0;
}

.reading-layout__controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
}


/* =========================================================
   29. PLAYER SHELL
   ========================================================= */

.player-shell {
    position: fixed;
    inset: auto 0 0;
    z-index: var(--z-sticky);
    width: 100%;
}

.player-shell__inner {
    display: grid;
    grid-template-columns:
        minmax(0, 1fr)
        auto
        minmax(0, 1fr);
    align-items: center;
    gap: var(--space-5);
    width: min(
        calc(100% - (2 * var(--page-padding))),
        var(--content-max)
    );
    min-height: 76px;
    margin-inline: auto;
}

.player-shell__info,
.player-shell__controls,
.player-shell__actions {
    min-width: 0;
}

.player-shell__controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

.player-shell__actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-2);
}


/* =========================================================
   30. LARGE TABLET
   ========================================================= */

@media (max-width: 1180px) {

    .story-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .discovery__grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .mood-discovery__grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .site-footer__brand {
        grid-column: 1 / -1;
    }

    .player-shell__inner {
        grid-template-columns:
            minmax(0, 1fr)
            auto;
    }

    .player-shell__actions {
        display: none;
    }
}


/* =========================================================
   31. TABLET
   ========================================================= */

@media (max-width: 960px) {

    .site-header__navigation {
        display: none;
    }

    .site-header__mobile-toggle {
        display: inline-flex;
    }

    .hero {
        min-height: min(720px, 86svh);
    }

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

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

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

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

    .audio-cinema {
        grid-template-columns: 1fr;
    }

    .audio-cinema__visualizer {
        min-height: 300px;
    }

    .story-dna,
    .feature-split,
    .creator-layout,
    .reading-layout,
    .content-layout {
        grid-template-columns: 1fr;
    }

    .story-dna__meta,
    .reading-layout__aside,
    .content-layout__aside {
        position: static;
    }

    .cta-section__inner {
        grid-template-columns: 1fr;
    }

    .site-footer__top {
        grid-template-columns: 1fr;
    }

    .site-footer__brand {
        grid-column: auto;
    }
}


/* =========================================================
   32. MOBILE
   ========================================================= */

@media (max-width: 720px) {

    .page__section {
        padding-block: var(--space-12);
    }

    .page__section--compact {
        padding-block: var(--space-8);
    }

    .page__section--large {
        padding-block: var(--space-16);
    }

    .site-header__inner {
        min-height: 64px;
    }

    .hero {
        min-height: 650px;
    }

    .hero__content {
        padding-block: var(--space-12);
    }

    .hero__actions {
        flex-direction: column;
        align-items: stretch;
    }

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

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

    .continue-world__grid {
        grid-template-columns: 1fr;
    }

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

    .story-rail__track {
        gap: var(--space-3);
    }

    .story-rail--portrait .story-rail__item {
        width: 150px;
    }

    .story-rail--wide .story-rail__item {
        width: min(78vw, 340px);
    }

    .audio-cinema {
        min-height: auto;
    }

    .audio-cinema__content {
        padding: var(--space-8);
    }

    .audio-cinema__visualizer {
        min-height: 240px;
    }

    .experience__topbar,
    .experience__bottombar {
        min-height: 56px;
    }

    .experience__center {
        padding: var(--space-5);
    }

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

    .site-footer__bottom {
        align-items: flex-start;
        flex-direction: column;
    }

    .player-shell__inner {
        width: calc(100% - 2rem);
        min-height: 68px;
    }
}


/* =========================================================
   33. SMALL MOBILE
   ========================================================= */

@media (max-width: 480px) {

    .section-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .hero {
        min-height: 600px;
    }

    .story-grid,
    .story-grid--three,
    .story-grid--two {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: var(--space-3);
    }

    .discovery__grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: var(--space-3);
    }

    .mood-discovery__grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: var(--space-3);
    }

    .site-footer__columns {
        grid-template-columns: 1fr;
    }

    .audio-cinema__content {
        padding: var(--space-6);
    }

    .player-shell__inner {
        gap: var(--space-3);
    }
}


/* =========================================================
   34. LANDSCAPE MOBILE
   ========================================================= */

@media (max-width: 900px) and (orientation: landscape) {

    .hero {
        min-height: 100svh;
    }

    .audio-cinema {
        min-height: 100svh;
    }

    .experience {
        min-height: 100svh;
    }
}


/* =========================================================
   35. REDUCED MOTION
   ========================================================= */

@media (prefers-reduced-motion: reduce) {

    .story-rail__viewport {
        scroll-behavior: auto;
    }
}


/* =========================================================
   36. PRINT
   ========================================================= */

@media print {

    .site-header,
    .site-footer,
    .player-shell,
    .overlay,
    .modal,
    .drawer,
    .page-transition,
    .experience__controls {
        display: none !important;
    }

    .hero {
        min-height: auto;
    }

    .page__section {
        padding-block: 1rem;
    }
}