/* ============================================
   CHAPTER 4: FORM
   Theme: Something becomes real. Crystallization of observation and choice.
   Scope: body[data-chapter="form"]
   ============================================ */

body[data-chapter="form"] {
    --form-bg: #050608;
    --form-surface: #0B0C10;
    --form-cyan: #00F0FF;
    --form-magenta: #FF4FA3;
    --form-lavender: #B28BFF;
    --form-yellow: #FFE600;
    --form-ink: #ECEFF4;
    --form-mute: #5E6472;
    --form-border: rgba(236, 239, 244, 0.12);

    background: var(--form-bg);
    color: var(--form-ink);
    overflow-y: auto;
    overflow-x: hidden;
}

body[data-chapter="form"]::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background:
        radial-gradient(ellipse at 50% 15%, rgba(0, 240, 255, 0.03) 0%, transparent 55%),
        radial-gradient(ellipse at 50% 85%, rgba(178, 139, 255, 0.025) 0%, transparent 60%);
}

.chapter-form {
    position: relative;
    width: 100%;
    z-index: 1;
}

/* ============================================
   HEADER
   ============================================ */
.form-head {
    width: min(1040px, 90vw);
    margin: 0 auto;
    padding-top: clamp(6rem, 12vh, 9rem);
    padding-bottom: clamp(2rem, 5vh, 4rem);
}

.form-meta {
    display: flex;
    align-items: center;
    gap: 1em;
    font-family: 'JetBrains Mono', monospace;
    font-size: var(--size-meta);
    letter-spacing: 0.28em;
    color: var(--form-mute);
    text-transform: uppercase;
    margin-bottom: 0.8rem;
}

.form-meta .meta-index {
    color: var(--form-cyan);
    font-weight: 500;
}

.form-meta .meta-divider {
    display: inline-block;
    width: 24px;
    height: 1px;
    background: var(--form-mute);
}

.form-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 4.2rem);
    line-height: 0.95;
    letter-spacing: 0.02em;
    color: var(--form-ink);
    text-transform: uppercase;
}

/* ============================================
   FORMS CONTAINER
   ============================================ */
.forms-container {
    display: flex;
    flex-direction: column;
    gap: clamp(4rem, 10vh, 8rem);
    padding-bottom: clamp(5rem, 12vh, 9rem);
}

.form-artifact {
    width: min(1040px, 90vw);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-artifact-frame {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: var(--form-surface);
    border: 1px solid var(--form-border);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

.form-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
}

.form-media {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: contrast(1.05);
}

.form-artifact-info {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 0 0.25rem;
}

.artifact-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    letter-spacing: 0.2em;
    color: var(--form-cyan);
}

.artifact-name {
    font-family: var(--font-body);
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    font-weight: 400;
    letter-spacing: 0.08em;
    color: var(--form-ink);
    text-transform: uppercase;
}

.artifact-note {
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 300;
    letter-spacing: 0.06em;
    color: var(--form-mute);
}

/* ============================================
   FORM FOOTER / RETURN TO 01
   ============================================ */
.form-footer {
    position: relative;
    width: 100%;
    padding: clamp(3rem, 8vh, 6rem) var(--gutter) clamp(4rem, 10vh, 7rem);
    border-top: 1px solid var(--form-border);
    background: rgba(5, 6, 8, 0.8);
}

.form-footer-inner {
    width: min(1040px, 90vw);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    flex-wrap: wrap;
    gap: 2rem;
}

.form-summary {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-summary .sum-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    color: var(--form-mute);
}

.form-summary .sum-text {
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.6vw, 1.3rem);
    font-weight: 300;
    letter-spacing: 0.08em;
    color: var(--form-ink);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 720px) {
    .form-artifact-frame {
        aspect-ratio: 4 / 3;
    }

    .form-footer-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }
}