.spring-note {
    margin-top: 18px;
    padding: 16px 18px;
    border-radius: 14px;
    border: 1px solid var(--border-color);
    background: rgba(46, 204, 113, 0.05);
}

.spring-note code {
    font-size: 0.85rem;
    word-break: break-word;
}

.spring-divider {
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
    margin: 28px 0;
}

.spring-grid-3,
.spring-grid-2,
.spring-season-grid,
.spring-feature-grid {
    display: grid;
    gap: 20px;
}

.spring-grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 24px;
}

.spring-grid-2,
.spring-feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 22px;
    align-items: start;
}

.spring-season-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 24px;
}

.spring-card {
    padding: 20px 18px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.05);
}

.spring-card p:last-child,
.spring-card ul:last-child {
    margin-bottom: 0;
}

.spring-icon {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    font-size: 1.1rem;
}

.spring-process-step {
    position: relative;
    overflow: hidden;
}

.spring-process-step::after {
    content: "";
    position: absolute;
    inset: auto -20% -40% auto;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: rgba(46, 204, 113, 0.06);
}

.spring-bridge-diagram {
    width: min(100%, 920px);
    margin: 26px auto 0;
    padding: 24px;
    border: 1px solid var(--border-color);
    border-radius: 18px;
    background: linear-gradient(180deg, rgba(255, 248, 239, 0.75), rgba(255, 255, 255, 0.98));
}

.spring-bridge-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 20px;
    align-items: center;
}

.spring-bridge-col {
    padding: 24px 18px;
    border-radius: 16px;
    text-align: center;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.92);
}

.spring-bridge-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    border-radius: 50%;
    color: #8a6a3f;
    background: rgba(244, 223, 198, 0.55);
    border: 1px solid rgba(138, 106, 63, 0.18);
    font-weight: 700;
    text-align: center;
    line-height: 1.25;
    padding: 8px;
}

.spring-bridge-letter {
    display: block;
    font-size: 2.1rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.spring-letter-lab {
    padding: 18px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    background: rgba(248, 248, 248, 0.9);
}

.spring-letter-sample {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

.spring-letter-chip {
    padding: 10px 14px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: #fff;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.spring-ideation-figure {
    margin: 0;
}

.spring-ideation-figure img {
    width: 100%;
    height: auto;
    border: 1px solid #d9d9d9;
    border-radius: 14px;
    display: block;
    background: #f5f5f5;
}

.spring-ideation-figure figcaption {
    margin-top: 10px;
    font-size: 0.85rem;
    color: var(--secondary-text);
}

.spring-demo-wrap {
    display: flex;
    justify-content: center;
}

.spring-phone {
    width: 300px;
    max-width: 100%;
    padding: 10px;
    border-radius: 34px;
    border: 1px solid rgba(17, 17, 17, 0.12);
    background: linear-gradient(180deg, #1c1c1c, #3d3d3d);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.16);
}

.spring-phone-screen {
    position: relative;
    min-height: 560px;
    border-radius: 26px;
    overflow: hidden;
    padding: 26px 18px 18px;
    background: linear-gradient(180deg, #f7f0e4 0%, #fbf8f1 48%, #ffffff 100%);
}

.spring-phone-notch {
    width: 110px;
    height: 20px;
    border-radius: 999px;
    background: #111;
    margin: 0 auto 18px;
}

.spring-trace-area {
    position: relative;
    min-height: 310px;
    border-radius: 20px;
    border: 1px dashed rgba(138, 106, 63, 0.4);
    background:
        radial-gradient(circle at top right, rgba(255, 209, 102, 0.18), transparent 28%),
        radial-gradient(circle at bottom left, rgba(46, 204, 113, 0.12), transparent 30%),
        rgba(255, 255, 255, 0.7);
}

.spring-character {
    position: absolute;
    inset: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 7rem;
    font-weight: 800;
    color: rgba(138, 106, 63, 0.16);
    letter-spacing: 0.06em;
}

.spring-character-letters {
    position: absolute;
    inset: auto 20px 24px 20px;
    text-align: center;
    font-size: 0.85rem;
    letter-spacing: 0.38em;
    color: rgba(138, 106, 63, 0.55);
    font-weight: 700;
}

.spring-trace-path,
.spring-trace-path-2 {
    position: absolute;
    border-radius: 999px;
    background: linear-gradient(90deg, rgba(46, 204, 113, 0.25), rgba(46, 204, 113, 0.75));
    box-shadow: 0 0 0 8px rgba(46, 204, 113, 0.08);
}

.spring-trace-path {
    top: 76px;
    left: 48px;
    width: 168px;
    height: 14px;
    animation: springTracePath 2.6s ease-in-out infinite;
}

.spring-trace-path-2 {
    top: 136px;
    left: 112px;
    width: 14px;
    height: 136px;
    animation: springTracePath 2.6s ease-in-out infinite 0.55s;
}

.spring-finger {
    position: absolute;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: #fff;
    border: 1px solid rgba(17, 17, 17, 0.08);
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.14);
    right: 56px;
    top: 92px;
    animation: springFingerMove 2.6s ease-in-out infinite;
}

.spring-finger::before {
    content: "";
    position: absolute;
    inset: 8px;
    border-radius: 50%;
    background: rgba(46, 204, 113, 0.18);
}

.spring-translation-card {
    position: absolute;
    left: 14px;
    right: 14px;
    bottom: 16px;
    padding: 16px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid var(--border-color);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
    animation: springCardRise 2.6s ease-in-out infinite;
}

.spring-translation-card small {
    display: block;
    margin-bottom: 6px;
    color: var(--secondary-text);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 700;
}

.spring-translation-card p {
    margin: 0;
    line-height: 1.55;
}

.spring-card-list {
    margin: 12px 0 0 20px;
}

.spring-card-list li + li {
    margin-top: 8px;
}

.spring-season-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 14px;
}

.spring-tone-spring { background: rgba(126, 217, 87, 0.12); color: #4c8f2f; }
.spring-tone-summer { background: rgba(255, 190, 92, 0.16); color: #a05d00; }
.spring-tone-autumn { background: rgba(223, 126, 70, 0.14); color: #8f4a15; }
.spring-tone-winter { background: rgba(125, 171, 224, 0.14); color: #305b88; }

.spring-translation-layout {
    padding: 20px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 26px rgba(0, 0, 0, 0.08);
}

.spring-poem-columns {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 20px;
    align-items: start;
}

.spring-poem-zh {
    font-size: 1.75rem;
    line-height: 1.55;
    letter-spacing: 0.08em;
    color: #2b2b2b;
}

.spring-poem-meta {
    display: inline-flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.spring-poem-meta span {
    padding: 5px 10px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    color: var(--secondary-text);
    font-size: 0.78rem;
    font-weight: 600;
}

.spring-cta-wrap {
    margin-top: 30px;
    text-align: center;
}

.spring-cta-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 28px;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 700;
    background: var(--accent-color);
    color: #fff;
    box-shadow: 0 10px 22px rgba(46, 204, 113, 0.24);
    transform: scale(1);
    transition: transform 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.spring-cta-btn:hover {
    background: #24b866;
    transform: scale(1.03);
    box-shadow: 0 14px 28px rgba(46, 204, 113, 0.28);
}

@keyframes springTracePath {
    0%, 100% { opacity: 0.35; }
    50% { opacity: 1; }
}

@keyframes springFingerMove {
    0% {
        transform: translate(0, 0);
        opacity: 0.75;
    }
    38% {
        transform: translate(-108px, -8px);
        opacity: 1;
    }
    72% {
        transform: translate(-108px, 132px);
        opacity: 1;
    }
    100% {
        transform: translate(-90px, 148px);
        opacity: 0.8;
    }
}

@keyframes springCardRise {
    0%, 24% {
        transform: translateY(28px);
        opacity: 0.1;
    }
    48%, 100% {
        transform: translateY(0);
        opacity: 1;
    }
}

@media (max-width: 980px) {
    .spring-grid-3,
    .spring-grid-2,
    .spring-season-grid,
    .spring-feature-grid,
    .spring-poem-columns {
        grid-template-columns: 1fr;
    }

    .spring-bridge-grid {
        grid-template-columns: 1fr;
    }

    .spring-bridge-arrow {
        margin: 0 auto;
    }
}

@media (max-width: 700px) {
    .spring-phone {
        width: 100%;
        max-width: 300px;
    }

    .spring-phone-screen {
        min-height: 520px;
    }

    .spring-character {
        font-size: 5.4rem;
    }
}

/* Design process phase headers — green, gold, and blue from the Four Seasons palette */
.case-phase-block-header {
    background: linear-gradient(165deg, rgba(46, 204, 113, 0.1) 0%, rgba(255, 193, 7, 0.1) 45%, rgba(52, 152, 219, 0.08) 100%);
    border-bottom-color: rgba(138, 106, 63, 0.15);
}
[data-theme="dark"] .case-phase-block-header {
    background: linear-gradient(165deg, rgba(46, 204, 113, 0.14) 0%, rgba(255, 193, 7, 0.12) 45%, rgba(52, 152, 219, 0.12) 100%);
    border-bottom-color: rgba(138, 106, 63, 0.22);
}
.case-phase-kicker {
    color: #8a6a3f;
}
[data-theme="dark"] .case-phase-kicker {
    color: #d4b896;
}