/* ============================================================
   Echo — Case Study Page Styles
   Standalone CSS (no Webflow runtime dependency)
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
    /* Colors — Warm premium palette */
    --echo-bg: #0E0D0B;
    --echo-bg-subtle: #14130F;
    --echo-surface: rgba(255, 235, 200, 0.05);
    --echo-surface-hover: rgba(255, 235, 200, 0.1);
    --echo-border: rgba(255, 215, 160, 0.1);
    --echo-border-hover: rgba(255, 215, 160, 0.22);

    --echo-text: #F0EAE0;
    --echo-text-muted: rgba(255, 240, 220, 0.55);
    --echo-text-dim: rgba(255, 240, 220, 0.35);

    --echo-accent: #D4A574;
    --echo-accent-end: #E8C99B;
    --echo-gradient: linear-gradient(135deg, #C8956C, #E8C99B, #D4A574);

    /* Glass */
    --echo-glass-bg: rgba(255, 235, 200, 0.06);
    --echo-glass-border: rgba(255, 215, 160, 0.12);
    --echo-glass-blur: blur(16px);

    /* Typography */
    --echo-font: 'Inter Tight', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --echo-font-mono: 'SF Mono', 'Fira Code', monospace;

    --echo-fs-h1: clamp(2.25rem, 5vw, 3.5rem);
    --echo-fs-h2: clamp(1.375rem, 3vw, 1.75rem);
    --echo-fs-h3: 1.125rem;
    --echo-fs-body: 1rem;
    --echo-fs-caption: 0.875rem;
    --echo-fs-small: 0.75rem;

    --echo-lh-tight: 1.2;
    --echo-lh-normal: 1.6;

    /* Spacing (8pt system) */
    --echo-space-xs: 4px;
    --echo-space-sm: 8px;
    --echo-space-md: 16px;
    --echo-space-lg: 24px;
    --echo-space-xl: 32px;
    --echo-space-2xl: 48px;
    --echo-space-3xl: 64px;
    --echo-space-4xl: 96px;

    /* Layout */
    --echo-max-w: 1100px;
    --echo-max-w-narrow: 800px;
    --echo-gutter: var(--echo-space-lg);

    /* Radii */
    --echo-radius-sm: 6px;
    --echo-radius-md: 12px;
    --echo-radius-lg: 20px;
    --echo-radius-full: 9999px;

    /* Shadows */
    --echo-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --echo-shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --echo-shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --echo-shadow-nav: 0 1px 8px rgba(0, 0, 0, 0.5);

    /* Transitions */
    --echo-ease: cubic-bezier(0.4, 0, 0.2, 1);
    --echo-duration: 0.25s;
}

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.echo-page {
    font-family: var(--echo-font);
    font-size: var(--echo-fs-body);
    line-height: var(--echo-lh-normal);
    color: var(--echo-text);
    background-color: var(--echo-bg);
    overflow-x: hidden;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
}

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

ul {
    list-style: none;
}

/* ---------- Focus Styles (Accessibility) ---------- */
:focus-visible {
    outline: 2px solid var(--echo-accent);
    outline-offset: 3px;
    border-radius: var(--echo-radius-sm);
}

/* ---------- Container ---------- */
.echo-container {
    width: 100%;
    max-width: var(--echo-max-w);
    margin: 0 auto;
    padding: 0 var(--echo-gutter);
}

.echo-container--narrow {
    max-width: var(--echo-max-w-narrow);
}

/* ---------- Section Spacing ---------- */
.echo-section {
    padding: var(--echo-space-4xl) 0;
}

.echo-section+.echo-section {
    border-top: 1px solid var(--echo-border);
}

.echo-section__label {
    display: inline-block;
    font-size: var(--echo-fs-small);
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--echo-text-muted);
    margin-bottom: var(--echo-space-lg);
}

.echo-section__title {
    font-size: var(--echo-fs-h2);
    font-weight: 600;
    line-height: var(--echo-lh-tight);
    margin-bottom: var(--echo-space-xl);
}

/* ---------- TOC / Contents ---------- */
.echo-toc {
    padding: var(--echo-space-2xl) 0 var(--echo-space-xl);
}

.echo-toc__label {
    font-size: var(--echo-fs-small);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--echo-text-dim);
    margin-bottom: var(--echo-space-md);
}

.echo-toc__list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--echo-space-sm);
}

.echo-toc__chip {
    display: inline-flex;
    align-items: center;
    padding: var(--echo-space-sm) var(--echo-space-md);
    font-size: var(--echo-fs-caption);
    font-weight: 500;
    color: var(--echo-text-muted);
    background: var(--echo-glass-bg);
    border: 1px solid var(--echo-glass-border);
    border-radius: var(--echo-radius-full);
    backdrop-filter: var(--echo-glass-blur);
    -webkit-backdrop-filter: var(--echo-glass-blur);
    transition: all var(--echo-duration) var(--echo-ease);
}

.echo-toc__chip:hover {
    color: var(--echo-text);
    background: var(--echo-surface-hover);
    border-color: var(--echo-border-hover);
}

/* ---------- Hero ---------- */
.echo-hero {
    position: relative;
    padding: var(--echo-space-4xl) 0 var(--echo-space-3xl);
    text-align: center;
    overflow: hidden;
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.echo-hero__bg-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    object-fit: cover;
    z-index: 0;
    pointer-events: none;
    -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 15%, black 75%, transparent 100%);
    mask-image: linear-gradient(to bottom, transparent 0%, black 15%, black 75%, transparent 100%);
}

.echo-hero__overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    background: linear-gradient(to bottom,
            rgba(14, 14, 18, 0.55) 0%,
            rgba(14, 14, 18, 0.7) 50%,
            rgba(14, 14, 18, 0.95) 100%);
}

.echo-hero__content {
    position: relative;
    z-index: 2;
}

.echo-hero__title {
    font-size: var(--echo-fs-h1);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: var(--echo-lh-tight);
    background: var(--echo-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--echo-space-md);
}

.echo-hero__title-sub {
    display: block;
    font-size: clamp(1rem, 2.5vw, 1.5rem);
    font-weight: 400;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    background: linear-gradient(135deg, rgba(212, 165, 116, 0.7), rgba(232, 201, 155, 0.7));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-top: var(--echo-space-sm);
}

.echo-hero__subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--echo-text-muted);
    max-width: 560px;
    margin: 0 auto var(--echo-space-xl);
    line-height: var(--echo-lh-normal);
}

.echo-hero__meta {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--echo-space-md);
    margin-bottom: var(--echo-space-xl);
}

.echo-meta-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    font-size: var(--echo-fs-small);
    font-weight: 500;
    color: var(--echo-text-muted);
    background: var(--echo-glass-bg);
    border: 1px solid var(--echo-glass-border);
    border-radius: var(--echo-radius-full);
    backdrop-filter: var(--echo-glass-blur);
    -webkit-backdrop-filter: var(--echo-glass-blur);
}

.echo-meta-tag__label {
    color: var(--echo-text-dim);
}

.echo-hero__actions {
    display: flex;
    justify-content: center;
    gap: var(--echo-space-md);
    flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.echo-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    font-family: var(--echo-font);
    font-size: var(--echo-fs-caption);
    font-weight: 600;
    border: none;
    border-radius: var(--echo-radius-full);
    cursor: pointer;
    transition: all var(--echo-duration) var(--echo-ease);
    text-decoration: none;
}

.echo-btn--primary {
    background: var(--echo-gradient);
    color: #1a1510;
    font-weight: 700;
}

.echo-btn--primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(212, 165, 116, 0.3);
}

.echo-btn--secondary {
    background: var(--echo-glass-bg);
    color: var(--echo-text);
    border: 1px solid var(--echo-glass-border);
    backdrop-filter: var(--echo-glass-blur);
    -webkit-backdrop-filter: var(--echo-glass-blur);
}

.echo-btn--secondary:hover {
    background: var(--echo-surface-hover);
    border-color: var(--echo-border-hover);
    transform: translateY(-1px);
}

/* ---------- Film Section ---------- */
.echo-film {
    padding: var(--echo-space-3xl) 0 var(--echo-space-4xl);
}

.echo-film__player {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    /* 16:9 */
    background: #000;
    border-radius: var(--echo-radius-lg);
    overflow: hidden;
    box-shadow: var(--echo-shadow-lg);
}

.echo-film__player video,
.echo-film__player iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* ---------- Overview ---------- */
.echo-overview__list {
    max-width: 680px;
}

.echo-overview__list li {
    position: relative;
    padding-left: var(--echo-space-lg);
    margin-bottom: var(--echo-space-md);
    color: var(--echo-text);
    line-height: var(--echo-lh-normal);
}

.echo-overview__list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--echo-gradient);
}

/* ---------- Process Grid ---------- */
.echo-process__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--echo-space-md);
}

.echo-process__item {
    position: relative;
    border-radius: var(--echo-radius-md);
    overflow: hidden;
    cursor: pointer;
    background: var(--echo-surface);
    aspect-ratio: 4 / 3;
}

.echo-process__item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s var(--echo-ease);
}

.echo-process__item:hover img {
    transform: scale(1.04);
}

.echo-process__caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--echo-space-xl) var(--echo-space-md) var(--echo-space-sm);
    font-size: var(--echo-fs-small);
    color: rgba(255, 255, 255, 0.85);
    background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
    pointer-events: none;
}

/* ---------- Stills (Horizontal Scroll) ---------- */
.echo-stills__wrapper {
    position: relative;
    width: 100%;
    -webkit-mask-image: linear-gradient(to right, transparent, black 5%, black 95%, transparent);
    mask-image: linear-gradient(to right, transparent, black 5%, black 95%, transparent);
}

.echo-stills__nav {
    position: absolute;
    top: 50%;
    transform: translateY(-70%);
    /* slightly offset upward to account for scrollbar */
    z-index: 10;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--echo-glass-bg);
    border: 1px solid var(--echo-glass-border);
    backdrop-filter: var(--echo-glass-blur);
    -webkit-backdrop-filter: var(--echo-glass-blur);
    color: var(--echo-text);
    cursor: pointer;
    transition: all var(--echo-duration) var(--echo-ease);
}

.echo-stills__nav:hover {
    background: var(--echo-surface-hover);
    border-color: var(--echo-border-hover);
    transform: translateY(-70%) scale(1.05);
}

.echo-stills__nav svg {
    width: 20px;
    height: 20px;
}

.echo-stills__nav--prev {
    left: var(--echo-space-md);
}

.echo-stills__nav--next {
    right: var(--echo-space-md);
}

.echo-stills__track {
    display: flex;
    gap: var(--echo-space-md);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: var(--echo-space-md);
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

.echo-stills__track::-webkit-scrollbar {
    height: 6px;
}

.echo-stills__track::-webkit-scrollbar-track {
    background: transparent;
}

.echo-stills__track::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 3px;
}

.echo-stills__item {
    flex: 0 0 auto;
    width: clamp(320px, 50vw, 720px);
    border-radius: var(--echo-radius-md);
    overflow: hidden;
    cursor: pointer;
}

.echo-stills__item img {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    transition: transform 0.4s var(--echo-ease);
}

.echo-stills__item:hover img {
    transform: scale(1.03);
}

/* ---------- Credits ---------- */
.echo-credits__card {
    background: var(--echo-glass-bg);
    border: 1px solid var(--echo-glass-border);
    border-radius: var(--echo-radius-lg);
    padding: var(--echo-space-xl);
    backdrop-filter: var(--echo-glass-blur);
    -webkit-backdrop-filter: var(--echo-glass-blur);
}

.echo-credits__row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--echo-space-sm);
    margin-top: var(--echo-space-md);
}

.echo-credit-tag {
    padding: 6px 14px;
    font-size: var(--echo-fs-caption);
    font-weight: 500;
    color: var(--echo-text);
    background: var(--echo-surface-hover);
    border-radius: var(--echo-radius-full);
    border: 1px solid var(--echo-border);
}

/* ---------- Related ---------- */
.echo-related__card {
    display: flex;
    align-items: center;
    gap: var(--echo-space-xl);
    padding: var(--echo-space-xl);
    background: var(--echo-surface);
    border: 1px solid var(--echo-border);
    border-radius: var(--echo-radius-lg);
    transition: border-color var(--echo-duration) var(--echo-ease),
        background var(--echo-duration) var(--echo-ease);
}

.echo-related__card:hover {
    border-color: var(--echo-border-hover);
    background: var(--echo-surface-hover);
}

.echo-related__thumb {
    flex: 0 0 160px;
    height: 100px;
    border-radius: var(--echo-radius-md);
    overflow: hidden;
}

.echo-related__thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.echo-related__info {
    flex: 1;
}

.echo-related__info h3 {
    font-size: var(--echo-fs-h3);
    font-weight: 600;
    margin-bottom: var(--echo-space-xs);
}

.echo-related__info p {
    font-size: var(--echo-fs-caption);
    color: var(--echo-text-muted);
}

.echo-related__arrow {
    font-size: 1.25rem;
    color: var(--echo-text-dim);
    transition: transform var(--echo-duration) var(--echo-ease);
}

.echo-related__card:hover .echo-related__arrow {
    transform: translateX(4px);
    color: var(--echo-text-muted);
}

/* ---------- CTA Footer ---------- */
.echo-cta {
    text-align: center;
    padding: var(--echo-space-3xl) 0 var(--echo-space-4xl);
}

.echo-cta__buttons {
    display: flex;
    justify-content: center;
    gap: var(--echo-space-md);
    flex-wrap: wrap;
}

/* ---------- Back to Contents Bar ---------- */
.echo-back-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 90;
    padding: var(--echo-space-sm) var(--echo-space-lg);
    background: rgba(14, 13, 11, 0.8);
    backdrop-filter: var(--echo-glass-blur);
    -webkit-backdrop-filter: var(--echo-glass-blur);
    border-top: 1px solid var(--echo-border);
    display: flex;
    justify-content: center;
    transform: translateY(100%);
    opacity: 0;
    transition: transform 0.35s var(--echo-ease),
        opacity 0.35s var(--echo-ease);
    pointer-events: none;
}

.echo-back-bar--visible {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
}

.echo-back-bar__btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 20px;
    font-family: var(--echo-font);
    font-size: var(--echo-fs-small);
    font-weight: 600;
    color: var(--echo-text-muted);
    background: var(--echo-surface);
    border: 1px solid var(--echo-border);
    border-radius: var(--echo-radius-full);
    cursor: pointer;
    transition: all var(--echo-duration) var(--echo-ease);
}

.echo-back-bar__btn:hover {
    color: var(--echo-text);
    background: var(--echo-surface-hover);
    border-color: var(--echo-border-hover);
}

.echo-back-bar__btn svg {
    width: 14px;
    height: 14px;
}

/* ---------- Lightbox ---------- */
.echo-lightbox {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s var(--echo-ease),
        visibility 0.3s;
}

.echo-lightbox--open {
    opacity: 1;
    visibility: visible;
}

.echo-lightbox__img {
    max-width: 90vw;
    max-height: 88vh;
    object-fit: contain;
    border-radius: var(--echo-radius-sm);
    transform: scale(0.95);
    transition: transform 0.3s var(--echo-ease);
}

.echo-lightbox--open .echo-lightbox__img {
    transform: scale(1);
}

.echo-lightbox__close {
    position: absolute;
    top: var(--echo-space-lg);
    right: var(--echo-space-lg);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    color: #fff;
    font-size: 1.25rem;
    cursor: pointer;
    transition: background var(--echo-duration);
}

.echo-lightbox__close:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ---------- Responsive: Tablet ---------- */
@media (max-width: 768px) {
    .echo-section {
        padding: var(--echo-space-3xl) 0;
    }

    .echo-hero {
        padding: var(--echo-space-3xl) 0 var(--echo-space-2xl);
    }

    .echo-process__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .echo-related__card {
        flex-direction: column;
        text-align: center;
    }

    .echo-related__thumb {
        flex: 0 0 auto;
        width: 100%;
        height: 160px;
    }

    .echo-nav__links {
        gap: var(--echo-space-md);
    }
}

/* ---------- Responsive: Mobile ---------- */
@media (max-width: 480px) {
    :root {
        --echo-gutter: var(--echo-space-md);
    }

    .echo-section {
        padding: var(--echo-space-2xl) 0;
    }

    .echo-hero {
        padding: var(--echo-space-2xl) 0 var(--echo-space-xl);
    }

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

    .echo-btn {
        justify-content: center;
    }

    .echo-process__grid {
        grid-template-columns: 1fr;
    }

    .echo-toc__list {
        gap: 6px;
    }

    .echo-toc__chip {
        font-size: var(--echo-fs-small);
        padding: 6px 12px;
    }

    .echo-nav__inner {
        height: 52px;
    }

    .echo-nav__link {
        font-size: var(--echo-fs-small);
    }

    .echo-nav__links {
        gap: var(--echo-space-sm);
    }

    .echo-credits__card {
        padding: var(--echo-space-lg);
    }

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

/* ---------- Software Toolbar ---------- */
.echo-software-toolbar {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    align-items: stretch;
    margin-top: 40px;
    margin-bottom: 20px;
}

.echo-software-icon {
    height: 44px;
    width: auto;
    object-fit: contain;
    transition: all var(--echo-duration) var(--echo-ease);
}

.echo-software-icon:hover {
    transform: translateY(-2px);
}

.echo-software-text {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 20px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #ccc;
    font-weight: 500;
    font-size: 0.95rem;
    font-family: var(--echo-font);
    height: 44px;
    box-sizing: border-box;
    transition: all var(--echo-duration) var(--echo-ease);
    cursor: default;
}

.echo-software-text:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.3);
}