.poster-page main {
    width: min(1360px, calc(100% - 40px));
    padding-top: 3rem;
}

.poster-intro {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(250px, .55fr);
    gap: clamp(2rem, 6vw, 7rem);
    align-items: end;
    margin-bottom: 3rem;
}

.poster-intro h1 {
    max-width: 940px;
    margin-bottom: 1rem;
    font-size: clamp(3rem, 6.2vw, 5.9rem);
}

.poster-summary {
    max-width: 700px;
    margin: 0;
    color: var(--muted);
    font-size: 1.1rem;
    line-height: 1.55;
}

.poster-privacy {
    padding: 1.35rem 0 0 1.5rem;
    border-left: 3px solid var(--green);
}

.poster-privacy p {
    margin: .5rem 0 0;
    color: var(--muted);
    line-height: 1.5;
}

.poster-workbench {
    display: grid;
    grid-template-columns: minmax(420px, .82fr) minmax(500px, 1.18fr);
    align-items: start;
    border: 1px solid var(--line);
    border-radius: 1rem;
    background: var(--panel);
    box-shadow: 0 28px 80px rgba(23, 33, 30, .09);
    overflow: clip;
}

.poster-controls {
    min-width: 0;
    padding: clamp(1.4rem, 3vw, 2.5rem);
}

.control-title h2,
.preview-heading h2 {
    margin: 0;
    font-size: clamp(1.6rem, 3vw, 2.3rem);
    letter-spacing: -.03em;
}

.control-title p,
.preview-heading p {
    margin: .55rem 0 0;
    color: var(--muted);
    line-height: 1.5;
}

#poster-form {
    display: grid;
    gap: 1.25rem;
    margin-top: 1.5rem;
}

#poster-form fieldset {
    min-width: 0;
    margin: 0;
    padding: 1.1rem;
    border: 1px solid var(--line);
    border-radius: .8rem;
}

#poster-form legend {
    padding: 0 .45rem;
    font-size: .92rem;
    font-weight: 850;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: .9rem;
}

.wide-field {
    grid-column: 1 / -1;
}

#poster-form textarea,
#poster-form select {
    width: 100%;
    min-height: 48px;
    padding: .72rem .8rem;
    border: 1px solid #9da9a4;
    border-radius: .55rem;
    color: var(--ink);
    background: #fefefc;
    font: inherit;
}

#poster-form textarea {
    resize: vertical;
    line-height: 1.5;
}

#poster-form input::placeholder,
#poster-form textarea::placeholder {
    color: #68746f;
    opacity: 1;
}

#poster-form textarea:focus,
#poster-form select:focus {
    outline: 3px solid rgba(23, 107, 85, .28);
    outline-offset: 2px;
}

#poster-form input[type="color"] {
    padding: .35rem;
    cursor: pointer;
}

.field-help {
    margin: .45rem 0 0;
    color: var(--muted);
    font-size: .8rem;
    line-height: 1.45;
}

.poster-status {
    min-height: 1.5rem;
    margin-top: 1.2rem;
    color: var(--success);
    font-size: .88rem;
    line-height: 1.45;
}

.poster-status.error {
    color: var(--danger);
}

.poster-actions {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
    align-items: center;
}

.poster-preview-panel {
    position: sticky;
    top: 1rem;
    min-width: 0;
    min-height: 100%;
    padding: clamp(1.4rem, 3vw, 2.5rem);
    background:
        linear-gradient(145deg, rgba(216, 240, 103, .2), transparent 48%),
        #e5eae5;
}

.preview-heading {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: end;
    margin-bottom: 1.25rem;
}

#poster-readiness {
    max-width: 150px;
    color: #42534d;
    font-size: .76rem;
    font-weight: 800;
    line-height: 1.35;
    text-align: right;
}

.poster-canvas-stage {
    width: min(100%, 600px);
    margin: 0 auto;
    line-height: 0;
}

#poster-canvas {
    width: 100%;
    height: auto;
    border: 1px solid rgba(23, 33, 30, .12);
    background: #173e34;
    box-shadow: 0 22px 55px rgba(30, 42, 37, .2);
}

.poster-description {
    max-width: 600px;
    margin: 1rem auto 0;
    color: #53605b;
    font-size: .82rem;
    line-height: 1.45;
    text-align: center;
}

.poster-guidance {
    display: grid;
    grid-template-columns: minmax(260px, .7fr) minmax(0, 1.3fr);
    gap: clamp(2rem, 7vw, 7rem);
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 1px solid var(--line);
}

.poster-guidance h2 {
    max-width: 440px;
    font-size: clamp(2rem, 4vw, 3.6rem);
    line-height: 1.02;
    letter-spacing: -.045em;
}

.poster-guidance > div {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.poster-guidance p {
    margin: 0;
    color: var(--muted);
    line-height: 1.55;
}

.poster-guidance strong {
    display: block;
    margin-bottom: .45rem;
    color: var(--ink);
}

@media (max-width: 1020px) {
    .poster-intro {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .poster-privacy {
        max-width: 650px;
    }

    .poster-workbench {
        grid-template-columns: 1fr;
    }

    .poster-preview-panel {
        position: static;
    }
}

@media (max-width: 720px) {
    .poster-page main {
        width: min(100% - 20px, 1360px);
        padding-top: 2rem;
    }

    .poster-intro h1 {
        font-size: clamp(2.55rem, 12vw, 4rem);
    }

    .form-grid,
    .poster-guidance,
    .poster-guidance > div {
        grid-template-columns: 1fr;
    }

    .wide-field {
        grid-column: auto;
    }

    .preview-heading {
        display: block;
    }

    #poster-readiness {
        display: block;
        max-width: none;
        margin-top: .7rem;
        text-align: left;
    }

    .poster-actions {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (prefers-color-scheme: dark) {
    #poster-form textarea,
    #poster-form select {
        border-color: #60716a;
        color: var(--ink);
        background: #111a17;
    }

    #poster-form input::placeholder,
    #poster-form textarea::placeholder {
        color: #9aa9a2;
    }

    .poster-preview-panel {
        background:
            linear-gradient(145deg, rgba(155, 188, 71, .12), transparent 48%),
            #222e2a;
    }

    #poster-readiness,
    .poster-description {
        color: #b9c7c0;
    }

    .poster-status.error {
        color: #ffaaa3;
    }
}