*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "SF Pro", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    color: #5b5660;
    background: linear-gradient(180deg, #FFCAD6 0%, #E3FFF9 100%);
}

.page-letter-compose {
    min-height: 100vh;
    max-width: 1440px;
    margin: 0 auto;
    padding: 24px 24px 56px;
}

.compose-header,
.compose-panel {
    width: min(1120px, 100%);
    margin: 0 auto;
}

.compose-header {
    display: flex;
    flex-direction: column;
    gap: 18px;
    margin-bottom: 28px;
}

.compose-back {
    display: inline-block;
    width: fit-content;
    color: #ED688D;
    text-decoration: none;
    font-size: 16px;
    font-weight: 700;
}

.compose-title-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    text-align: center;
}

.compose-title-icon {
    width: 52px;
    height: 52px;
}

.compose-title {
    margin: 0;
    font-size: clamp(30px, 4.5vw, 44px);
    color: #4DA39F;
}

.compose-subtitle {
    margin: 8px 0 0;
    color: #757575;
    font-size: 16px;
}

.compose-panel {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
    gap: 24px;
    align-items: start;
}

.compose-form,
.compose-preview {
    padding: 28px;
    border-radius: 32px;
    background: rgba(255, 255, 255, 0.72);
    box-shadow: 0 20px 45px rgba(148, 124, 137, 0.14);
    backdrop-filter: blur(10px);
}

.compose-form {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.compose-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.compose-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.compose-field span,
.compose-preview-kicker {
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: #ED688D;
    text-transform: uppercase;
}

.compose-field input,
.compose-field select,
.compose-field textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid rgba(237, 104, 141, 0.18);
    border-radius: 18px;
    font: inherit;
    color: #544e59;
    background: rgba(255, 255, 255, 0.92);
    outline: none;
}

.compose-field textarea {
    resize: vertical;
    min-height: 180px;
}

.compose-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 8px;
}

.compose-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 148px;
    padding: 14px 24px;
    border: none;
    border-radius: 999px;
    font-size: 16px;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
}

.compose-btn--mint {
    color: #4DA39F;
    background: #A5E1D4;
}

.compose-btn--pink {
    color: #ED688D;
    background: #FFCAD6;
}

.compose-btn--ghost {
    color: #757575;
    background: rgba(255, 255, 255, 0.9);
    box-shadow: inset 0 0 0 1px rgba(117, 117, 117, 0.18);
}

.compose-feedback {
    margin: 0;
    color: #4DA39F;
    font-weight: 700;
}

.compose-field--schedule {
    transition: opacity 0.2s ease;
}

.compose-preview-kicker {
    margin: 0 0 8px;
    color: #4DA39F;
}

.compose-preview-title {
    margin: 0 0 20px;
    font-size: 24px;
    color: #54505b;
}

.preview-card {
    position: relative;
    overflow: hidden;
    padding: 40px 22px 22px;
    border-radius: 28px;
    background:
        repeating-linear-gradient(
            180deg,
            rgba(255, 255, 255, 0.96) 0,
            rgba(255, 255, 255, 0.96) 31px,
            rgba(165, 225, 212, 0.08) 31px,
            rgba(165, 225, 212, 0.08) 32px
        );
    box-shadow: 0 16px 34px rgba(148, 124, 137, 0.15);
}

.preview-envelope {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: linear-gradient(135deg, #FFD7E1 0%, #FFECEF 48%, #FFFFFF 100%);
    clip-path: polygon(0 0, 100% 0, 50% 100%);
}

.preview-status {
    display: inline-block;
    padding: 8px 14px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 700;
    color: #ED688D;
    background: rgba(255, 255, 255, 0.75);
}

.preview-card-title {
    margin: 16px 0 10px;
    font-size: 20px;
    color: #4f4954;
}

.preview-card-meta,
.preview-card-content {
    margin: 0 0 8px;
    color: #66616a;
    line-height: 1.7;
}

.preview-sign {
    margin: 20px 0 0;
    text-align: right;
    color: #4DA39F;
    font-weight: 700;
}

@media (max-width: 900px) {
    .compose-panel {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .page-letter-compose {
        padding: 20px 14px 40px;
    }

    .compose-form,
    .compose-preview {
        padding: 18px;
        border-radius: 24px;
    }

    .compose-grid {
        grid-template-columns: 1fr;
    }

    .compose-btn {
        width: 100%;
    }
}