:root {
  --primary-color: #4285F4; --secondary-color: #34A853; --accent-color: #FBBC04; --red-color: #EA4335;
  --text-color: #1f2937; --text-secondary: #6b7280; --bg-color: #f8fafc;
  --card-bg: rgba(255, 255, 255, 0.85); --glass-bg: rgba(255, 255, 255, 0.2); 
  --glass-border: transparent; /* 消除白线核心：透明边框 */
  --shadow: 0 6px 20px rgba(0, 0, 0, 0.08); --shadow-hover: 0 10px 30px rgba(0, 0, 0, 0.12);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1); --gradient: linear-gradient(135deg, #4285F4, #34A853);
}

[data-theme='dark'] {
  --primary-color: #8ab4f8; --secondary-color: #81c995; --accent-color: #fdd663; --red-color: #f28b82;
  --text-color: #f1f5f9; --text-secondary: #cbd5e1; --bg-color: #0f172a;
  --card-bg: rgba(30, 41, 59, 0.85); --glass-bg: rgba(30, 41, 59, 0.2); 
  --glass-border: transparent; /* 消除白线核心：透明边框 */
  --shadow: 0 6px 20px rgba(0, 0, 0, 0.2); --shadow-hover: 0 10px 30px rgba(0, 0, 0, 0.3);
  --gradient: linear-gradient(135deg, #8ab4f8, #81c995);
}

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

body {
  font-family: 'Inter', sans-serif; background: var(--bg-color); color: var(--text-color); line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease; -webkit-font-smoothing: antialiased;
}

body::before {
  content: ''; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image: radial-gradient(at 80% 20%, rgba(66, 133, 244, 0.08) 0px, transparent 50%), radial-gradient(at 20% 80%, rgba(52, 168, 83, 0.05) 0px, transparent 50%);
}

.service-card, .logo-icon, .theme-toggle { transform: translateZ(0); backface-visibility: hidden; }

/* 彻底移除输入框和按钮的边框 */
input, .dropdown-btn, .theme-toggle { border: none !important; }
input:focus { outline: none; box-shadow: 0 0 0 2px rgba(66, 133, 244, 0.2), var(--shadow) !important; transform: translateY(-1px); }
.dropdown-btn:hover, .theme-toggle:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover) !important; background: var(--card-bg) !important; }

.dropdown-content {
  position: absolute; top: 100%; right: 0; background: var(--card-bg); backdrop-filter: blur(8px);
  border-radius: 18px; box-shadow: var(--shadow); border: none !important;
  padding: 18px; min-width: 350px; max-height: 500px; overflow-y: auto; z-index: 1000;
  display: none; flex-direction: column; gap: 14px; margin-top: 12px;
}
.dropdown-content.show { display: flex; animation: fadeInUp 0.25s ease; }
.dropdown-group { display: flex; flex-direction: column; gap: 10px; }
.dropdown-group h3 { font-size: 14px; font-weight: 600; margin-bottom: 8px; color: var(--primary-color); padding-bottom: 8px; border-bottom: 1px solid rgba(255,255,255,0.05); text-transform: uppercase; letter-spacing: 0.5px; }
.filter-option { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-radius: 12px; cursor: pointer; transition: var(--transition); color: var(--text-color); font-weight: 400; }
.filter-option:hover { background: rgba(66, 133, 244, 0.08); transform: translateX(3px); }
.filter-option.active { background: var(--gradient); color: white; box-shadow: 0 4px 15px rgba(66, 133, 244, 0.2); }

.services-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 22px; margin-bottom: 30px; }

@media (max-width: 768px) {
  .services-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; }
  .dropdown-content { right: 0; left: 0; min-width: 100%; }
}
@media (max-width: 480px) {
  .services-grid { grid-template-columns: 1fr; gap: 14px; }
}

.service-card {
  background: var(--card-bg); backdrop-filter: blur(4px); border: none !important;
  border-radius: 16px; padding: 20px; box-shadow: var(--shadow); transition: var(--transition);
  display: flex; flex-direction: column; position: relative; overflow: hidden; min-height: 190px;
}
.service-card.hidden { display: none !important; }
.service-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: var(--gradient); opacity: 0; transition: opacity 0.25s ease; }
.service-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.service-card:hover::before { opacity: 1; }

.service-icon { width: 56px; height: 56px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 24px; color: white; margin-bottom: 16px; box-shadow: 0 6px 18px rgba(0, 0, 0, 0.12); }
.service-name { font-family: 'Poppins', sans-serif; font-weight: 600; font-size: 17px; margin-bottom: 10px; color: var(--text-color); line-height: 1.3; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.service-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.4; margin-bottom: 12px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; flex-grow: 1; min-height: 40px; }
.service-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.service-tag { background: rgba(66, 133, 244, 0.08); color: var(--primary-color); padding: 4px 10px; border-radius: 16px; font-size: 11px; font-weight: 500; transition: var(--transition); border: none !important; }
.service-tag:hover { background: rgba(66, 133, 244, 0.15); }
.service-link { display: inline-flex; align-items: center; gap: 8px; color: var(--primary-color); text-decoration: none; font-weight: 600; font-size: 14px; transition: var(--transition); margin-top: auto; align-self: flex-start; }
.service-link:hover { gap: 10px; color: var(--secondary-color); }

.active-filter { background: var(--gradient); color: white; padding: 8px 16px; border-radius: 20px; font-size: 13px; display: inline-flex; align-items: center; gap: 8px; font-weight: 500; box-shadow: 0 4px 12px rgba(66, 133, 244, 0.2); transition: var(--transition); }
.active-filter:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(66, 133, 244, 0.25); }

.pagination-controls { display: flex; justify-content: center; align-items: center; gap: 15px; margin: 40px 0; padding: 20px; flex-wrap: wrap; }
.pagination-btn { background: var(--gradient); color: white; border: none; padding: 12px 24px; border-radius: 12px; font-size: 15px; font-weight: 600; cursor: pointer; transition: var(--transition); box-shadow: 0 4px 12px rgba(66, 133, 244, 0.2); display: flex; align-items: center; gap: 8px; min-width: 120px; justify-content: center; }
.pagination-btn:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(66, 133, 244, 0.3); }
.pagination-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.pagination-info { color: var(--text-secondary); font-size: 14px; text-align: center; min-width: 200px; }
.pagination-numbers { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; justify-content: center; }
.page-number { background: var(--glass-bg); border: none !important; width: 36px; height: 36px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 14px; cursor: pointer; transition: var(--transition); color: var(--text-color); font-weight: 500; }
.page-number:hover { background: var(--card-bg); transform: translateY(-2px); }
.page-number.active { background: var(--gradient); color: white; box-shadow: 0 4px 12px rgba(66, 133, 244, 0.2); }
.page-number.ellipsis { cursor: default; background: transparent; border: none; width: 20px; }
.page-number.ellipsis:hover { transform: none; background: transparent; }

.loading-indicator { text-align: center; padding: 40px; color: var(--text-secondary); font-size: 16px; grid-column: 1 / -1; }
.loading-indicator i { font-size: 32px; margin-bottom: 15px; color: var(--primary-color); animation: spin 1.5s linear infinite; }
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-secondary); font-size: 16px; grid-column: 1 / -1; }
.empty-state i { font-size: 48px; margin-bottom: 15px; color: var(--primary-color); opacity: 0.5; }
.empty-state .small { font-size: 14px; margin-top: 8px; opacity: 0.7; }

.dropdown-content::-webkit-scrollbar { width: 5px; }
.dropdown-content::-webkit-scrollbar-track { background: rgba(0, 0, 0, 0.08); border-radius: 3px; }
.dropdown-content::-webkit-scrollbar-thumb { background: var(--primary-color); border-radius: 3px; }

@keyframes fadeInUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; } }

footer {
    text-align: center;
    padding: 35px 0;
    border-top: 1px solid rgba(255,255,255,0.05); /* 极其微弱的分界线 */
    font-size: 15px;
    color: var(--text-secondary);
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
}

footer::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 2px;
    background: var(--gradient);
}

footer b {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

footer p {
    margin: 0;
    text-align: center;
    width: 100%;
}

.footer-stats {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 8px;
    opacity: 0.8;
}