/* ===== 全局样式 ===== */
:root {
  --bg: #fffafc;
  --text: #333;
  --accent: #F5A3C7; /* 浅粉 */
  --mint: #B8EBD0;   /* 薄荷绿 */
  --shadow: rgba(0,0,0,0.08);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.6;
  scroll-behavior: smooth;
}

/* ===== 欢迎页面 ===== */
#welcome {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(120deg, var(--mint), var(--accent));
  color: #fff;
}

.welcome-text h1 {
  font-size: 2.4rem;
  margin-bottom: 0.6rem;
}

#welcome p {
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
}

#welcome button {
  padding: 0.6rem 1.4rem;
  background: #fff;
  color: var(--accent);
  border: none;
  border-radius: 999px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.3s ease;
}
#welcome button:hover {
  background: var(--mint);
  color: #fff;
}

/* ===== Header / Logo / Nav ===== */
header {
  position: sticky;
  top: 0;
  background: #fff;
  box-shadow: 0 2px 10px var(--shadow);
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: auto;
  padding: 0.5rem 1.5rem;
}

.logo-svg {
  width: 190px;
  height: auto;
}

.main-nav {
  display: flex;
  gap: 1.2rem;
  align-items: center;
}

.main-nav a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}
.main-nav a:hover {
  color: var(--accent);
}

/* ===== 汉堡按钮样式 ===== */
.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
}

.hamburger {
  width: 26px;
  height: 2px;
  background: var(--text);
  display: block;
  position: relative;
  transition: transform 0.3s ease;
}
.hamburger::before,
.hamburger::after {
  content: "";
  position: absolute;
  left: 0;
  width: 26px;
  height: 2px;
  background: var(--text);
  transition: transform 0.3s ease, top 0.3s ease, bottom 0.3s ease;
}
.hamburger::before { top: -8px; }
.hamburger::after  { bottom: -8px; }

/* 手机端导航展开样式 */
@media (max-width: 768px) {
  .main-nav {
    position: absolute;
    top: 72px;
    right: 12px;
    background: rgba(255,255,255,0.96);
    backdrop-filter: blur(6px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    padding: 1rem 1.2rem;
    border-radius: 12px;
    flex-direction: column;
    gap: 0.8rem;
    transform-origin: top right;
    transform: scale(0.95);
    opacity: 0;
    pointer-events: none;
    transition: opacity 260ms ease, transform 260ms ease;
  }

  .nav-open .main-nav {
    transform: scale(1);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-toggle { display: inline-block; }

  .nav-open .hamburger {
    transform: rotate(45deg);
    background: transparent;
  }
  .nav-open .hamburger::before {
    transform: rotate(90deg);
    top: 0;
  }
  .nav-open .hamburger::after {
    transform: rotate(90deg);
    bottom: 0;
  }
}

/* ===== Works 区 ===== */
#works {
  padding: 4rem 1.5rem;
  max-width: 1200px;
  margin: auto;
}
#works h2 {
  text-align: center;
  margin-bottom: 2rem;
  color: var(--accent);
}

.work-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.work-card {
  background: #fff;
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: 0 4px 14px var(--shadow);
  opacity: 0;
  transform: translateY(40px);
  animation: fadeInUp 0.8s forwards;
  animation-delay: var(--delay, 0s);
}
@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.work-card h3 {
  color: var(--accent);
  margin-bottom: 0.3rem;
}

.work-card ul {
  margin: 0.6rem 0;
  padding-left: 1.2rem;
}
.work-card iframe {
  width: 100%;
  height: 200px;
  border-radius: 12px;
  margin-top: 0.5rem;
}

/* ===== About 区 ===== */
#about {
  background: linear-gradient(90deg, #fff 50%, #fef6f9 50%);
  padding: 4rem 1.5rem;
}
#about h2 {
  text-align: center;
  color: var(--accent);
  margin-bottom: 2rem;
}
.about-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}
.about-photo img {
  width: 280px;
  height: 280px;
  object-fit: cover;
  border-radius: 50%;
  box-shadow: 0 6px 20px var(--shadow);
}
.about-text {
  flex: 1;
  max-width: 600px;
  text-align: justify;
}

/* ===== Contact 区 ===== */
#contact {
  text-align: center;
  padding: 3rem 1rem;
}
#contact h2 {
  color: var(--accent);
  margin-bottom: 1rem;
}
#contact a {
  color: var(--accent);
  text-decoration: none;
}
#contact a:hover {
  color: var(--mint);
}

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
  color: #888;
}