/* public/css/custom-dev.css */
/* 核心理念：专业、引导、交互、艺术 */
/* 版本：1.1 (修复布局 & 新增表单验证样式) */

:root {
    --dev-bg-color: #f5f5f7; /* 本页主背景色 */
    --dev-dark-bg: #111;    /* 暗色区域背景 */
    --dev-title-color: #1d1d1f;
    --dev-text-color: #555;
    --dev-brand-color: var(--brand-color, #007AFF);
}

/* --- 通用 Section 样式 --- */
.custom-dev-page .section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-family: var(--font-bold);
    color: var(--dev-title-color);
    text-align: center;
    margin-bottom: 1rem;
}
.custom-dev-page .section-subtitle {
    font-size: 1.1rem;
    color: var(--dev-text-color);
    text-align: center;
    max-width: 600px;
    margin: 0 auto 4rem auto;
    line-height: 1.7;
}

/* --- 1. 主视觉区 (Hero) --- */
.dev-hero-section {
    background-color: var(--dev-bg-color);
    /* ✅【修复】使用 calc() 结合 CSS 变量动态计算 padding-top，修复页眉遮挡问题 */
    padding: calc(var(--header-height, 92px) + 60px) 0 120px;
    min-height: 80vh;
    display: flex;
    align-items: center;
}
.dev-hero-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 3rem;
}
.hero-text-content {
    flex-basis: 55%;
    flex-shrink: 0;
}
.dev-hero-title {
    font-family: var(--font-bold);
    font-size: clamp(3.2rem, 7vw, 5.2rem);
    line-height: 1.15;
    margin: 0;
}
.dev-hero-subtitle {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--dev-text-color);
    max-width: 520px;
    margin: 1.5rem 0 0 0;
    text-align: left;
}
.hero-visual-content {
    flex-basis: 45%;
    display: flex;
    justify-content: center;
    align-items: center;
}
#code-crystal-canvas {
    max-width: 100%;
    height: auto;
}

/* --- 2. 开发流程区 (Timeline) --- */
.dev-process-section {
    padding: var(--section-padding);
    background-color: #fff;
}
.process-timeline {
    position: relative;
    max-width: 800px;
    margin: 4rem auto 0;
    padding: 2rem 0;
}
.process-timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 20px;
    height: 100%;
    width: 2px;
    background-color: #e0e0e0;
}
.timeline-item {
    position: relative;
    margin-bottom: 50px;
    padding-left: 60px;
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.timeline-item.is-visible {
    opacity: 1;
    transform: translateX(0);
}
.timeline-icon {
    position: absolute;
    left: 0;
    top: 0;
    width: 42px;
    height: 42px;
    background-color: var(--dev-bg-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    border: 2px solid #e0e0e0;
    transition: background-color 0.3s, border-color 0.3s;
}
.timeline-item.is-visible .timeline-icon {
    background-color: var(--dev-brand-color);
    border-color: var(--dev-brand-color);
    color: #fff;
}
.timeline-content h3 {
    font-family: var(--font-bold);
    margin: 0 0 0.5rem 0;
}
.timeline-content p {
    margin: 0;
    color: var(--dev-text-color);
}

/* --- 3. 服务领域区 (Accordion) --- */
.dev-expertise-section {
    padding: var(--section-padding);
    background-color: var(--dev-bg-color);
}
.expertise-accordion {
    max-width: 800px;
    margin: 0 auto;
}
.accordion-item {
    border-bottom: 1px solid #dcdcdc;
}
.accordion-header {
    width: 100%;
    background: none;
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    cursor: pointer;
    text-align: left;
}
.accordion-header h3 {
    margin: 0;
    font-size: 1.5rem;
    font-family: var(--font-bold);
    color: var(--dev-title-color);
}
.accordion-icon {
    font-size: 2rem;
    font-weight: 300;
    transition: transform 0.3s ease;
}
.accordion-item.active .accordion-icon {
    transform: rotate(45deg);
}
.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out, padding 0.4s ease;
}
.accordion-content p {
    padding: 0 0 1.5rem 0;
    margin: 0;
    line-height: 1.8;
    color: var(--dev-text-color);
}

/* --- 4. 项目问卷区 (Form) --- */
.dev-cta-section {
    padding: var(--section-padding);
    background-color: var(--dev-dark-bg);
}
.dev-cta-section .section-title,
.dev-cta-section .section-subtitle,
.inquiry-form label {
    color: #fff;
}
.dev-cta-section .section-subtitle {
    color: #a0a0a0;
}
.inquiry-form {
    max-width: 700px;
    margin: 3rem auto 0;
    position: relative;
    min-height: 250px;
    overflow: hidden;
}
.form-step {
    position: absolute;
    width: 100%;
    opacity: 0;
    visibility: hidden;
    transform: translateX(30px);
    transition: opacity 0.4s ease, transform 0.4s ease, visibility 0.4s;
}
.form-step.active {
    position: relative;
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}
.form-progress {
    width: 100%;
    height: 4px;
    background-color: #444;
    border-radius: 4px;
    margin-bottom: 2rem;
}
.progress-bar {
    width: 25%;
    height: 100%;
    background-color: var(--dev-brand-color);
    border-radius: 4px;
    transition: width 0.4s ease;
}

.inquiry-form label {
    display: block;
    font-size: 1.2rem;
    font-family: var(--font-bold);
    margin-bottom: 1.5rem;
}
.btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}
.btn-choice {
    background-color: #333;
    color: #fff;
    border: 1px solid #555;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}
.btn-choice:hover {
    background-color: #444;
    border-color: #777;
}
.btn-choice.selected {
    background-color: var(--dev-brand-color);
    border-color: var(--dev-brand-color);
}
.inquiry-form input[type="text"],
.inquiry-form input[type="email"],
.inquiry-form textarea {
    width: 100%;
    background-color: #222;
    border: 1px solid #555;
    color: #fff;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 0.25rem;
    font-family: var(--font-regular);
    font-size: 1rem;
    transition: border-color 0.3s ease;
}
.inquiry-form textarea {
    min-height: 120px;
    resize: vertical;
}

/* ✅【新增】输入框错误状态样式 */
.inquiry-form input.invalid,
.inquiry-form textarea.invalid {
    border-color: #e74c3c;
}

/* ✅【新增】验证错误信息样式 */
.validation-error {
    color: #e74c3c;
    font-size: 0.875rem;
    height: 1.5rem;
    line-height: 1.5rem;
    text-align: left;
    display: none;
}

.form-navigation {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}
.form-navigation button {
    background-color: var(--dev-brand-color);
    color: #fff;
    border: none;
    padding: 0.8rem 2.5rem;
    font-family: var(--font-bold);
    font-size: 1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: background-color 0.2s;
}
.form-navigation button:hover {
    background-color: #0056b3;
}
#prev-btn {
    background-color: #555;
}

.form-result-message {
    text-align: center;
    font-size: 1.2rem;
    padding: 2rem;
}
.form-result-message.success { color: #28a745; }
.form-result-message.error { color: #dc3545; }


/* --- 5. Media Queries for Responsiveness --- */
@media (max-width: 992px) {
    .dev-hero-container {
        gap: 1rem;
    }
    .dev-hero-title {
        font-size: clamp(2.8rem, 7vw, 4.5rem);
    }
}

@media (max-width: 768px) {
    .dev-hero-section {
        /* 在移动端，让内容区的上边距小一些 */
        padding-top: calc(var(--header-height, 92px) + 40px);
        padding-bottom: 80px;
        min-height: auto;
    }
    .dev-hero-container {
        flex-direction: column;
        text-align: center;
    }
    .dev-hero-subtitle {
        margin: 1.5rem auto 0;
        text-align: center;
    }
    .hero-visual-content {
        margin-top: 3rem;
        width: 100%;
        max-width: 300px;
    }
    .process-timeline::before {
        left: 20px;
    }
    .timeline-item {
        padding-left: 60px;
    }
}