/* ===== Reset & Variables ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --font-main: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --color-bg: #f8f9ff;
    --color-surface: #ffffff;
    --color-text: #1e1e3a;
    --color-text-secondary: #5b5b88;
    --color-border: #e0e4f5;
    --color-accent: #6c5ce7;
    --color-accent-light: #a29bfe;
    --color-accent-bg: #f0edff;
    --color-chip-bg: #eef0fc;
    --color-chip-active: #6c5ce7;
    --color-chip-active-text: #ffffff;
    --shadow-card: 0 4px 12px rgba(30,30,58,0.04), 0 1px 2px rgba(0,0,0,0.02);
    --shadow-modal: 0 25px 60px rgba(0,0,0,0.15);
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --transition: 0.2s cubic-bezier(0.2, 0, 0, 1);
}

[data-theme="dark"] {
    --color-bg: #111118;
    --color-surface: #1c1c28;
    --color-text: #f1f1ff;
    --color-text-secondary: #a0a0c0;
    --color-border: #2e2e42;
    --color-accent: #a29bfe;
    --color-accent-light: #6c5ce7;
    --color-accent-bg: #1f1d38;
    --color-chip-bg: #2a2a3a;
    --color-chip-active: #a29bfe;
    --color-chip-active-text: #111118;
    --shadow-card: 0 4px 16px rgba(0,0,0,0.25), 0 1px 3px rgba(255,255,255,0.02);
}

html {
    font-size: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background: var(--color-bg);
    color: var(--color-text);
    transition: background var(--transition), color var(--transition);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

a { color: var(--color-accent); text-decoration: none; }
.skip-link {
    position: absolute; top: -40px; left: 16px;
    background: var(--color-accent); color: #fff;
    padding: 8px 16px; border-radius: var(--radius-sm);
    z-index: 10000; font-weight: 600; text-decoration: none;
    transition: top 0.2s;
}
.skip-link:focus { top: 16px; }

/* ===== Header ===== */
.header {
    position: sticky; top: 0; z-index: 1000;
    background: rgba(248,249,255,0.85); backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border); padding: 0 20px;
    transition: background var(--transition), border var(--transition);
}
[data-theme="dark"] .header { background: rgba(28,28,40,0.85); }
.header-inner {
    max-width: 1280px; margin: 0 auto; display: flex;
    align-items: center; gap: 20px; height: 64px;
}
.logo {
    display: flex; align-items: center; gap: 10px;
    text-decoration: none; color: var(--color-text);
    font-weight: 700; font-size: 1.3rem; flex-shrink: 0;
}
.logo-icon { border-radius: 10px; }
.logo-text { white-space: nowrap; }

.search-wrap {
    flex: 1; max-width: 480px; position: relative;
    display: flex; align-items: center;
}
.search-icon {
    position: absolute; left: 14px; color: var(--color-text-secondary);
    pointer-events: none;
}
.search-input {
    width: 100%; padding: 10px 40px 10px 42px;
    border: 1.5px solid var(--color-border); border-radius: 30px;
    background: var(--color-bg); color: var(--color-text);
    font-size: 0.95rem; outline: none; transition: all var(--transition);
}
.search-input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(108,92,231,0.1);
}
.search-clear {
    position: absolute; right: 8px; background: none;
    border: none; font-size: 1.5rem; color: var(--color-text-secondary);
    cursor: pointer; padding: 4px 8px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
}

.theme-toggle {
    background: var(--color-chip-bg); border: none;
    width: 42px; height: 42px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; color: var(--color-text);
    transition: background var(--transition), color var(--transition);
    flex-shrink: 0;
}
.theme-toggle:hover { background: var(--color-accent-bg); color: var(--color-accent); }
.sun-icon, .moon-icon { width: 22px; height: 22px; }
[data-theme="dark"] .sun-icon { display: none; }
[data-theme="light"] .moon-icon { display: none; }

/* ===== Category Bar ===== */
.category-bar {
    position: sticky; top: 64px; background: var(--color-bg);
    border-bottom: 1px solid var(--color-border); padding: 10px 20px;
    z-index: 999; overflow-x: auto; -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.category-bar::-webkit-scrollbar { display: none; }
.category-scroll {
    display: flex; gap: 8px; max-width: 1280px; margin: 0 auto;
    flex-wrap: nowrap;
}
.cat-chip {
    padding: 6px 16px; border-radius: 20px;
    border: 1px solid var(--color-border);
    background: var(--color-surface); color: var(--color-text-secondary);
    font-size: 0.85rem; font-weight: 500; white-space: nowrap;
    cursor: pointer; transition: all var(--transition); flex-shrink: 0;
}
.cat-chip:hover { background: var(--color-accent-bg); color: var(--color-accent); }
.cat-chip.active {
    background: var(--color-chip-active); color: var(--color-chip-active-text);
    border-color: transparent; font-weight: 600;
}

/* ===== Main Content ===== */
.main-content {
    flex: 1; padding: 24px 20px 48px;
    max-width: 1280px; margin: 0 auto; width: 100%;
}

.hero {
    text-align: center; margin-bottom: 40px;
    padding: 30px 0 10px;
}
.hero-title {
    font-size: clamp(2rem, 5vw, 2.8rem);
    font-weight: 800; letter-spacing: -0.02em;
    color: var(--color-text); margin-bottom: 10px;
}
.hero-subtitle {
    font-size: 1.1rem; color: var(--color-text-secondary);
    max-width: 650px; margin: 0 auto 24px;
}
.hero-stats {
    display: flex; flex-wrap: wrap; justify-content: center;
    gap: 20px; color: var(--color-text-secondary);
}
.stat strong {
    font-size: 1.2rem; color: var(--color-accent);
}

.tools-header {
    display: flex; justify-content: space-between;
    align-items: baseline; flex-wrap: wrap; gap: 12px;
    margin-bottom: 24px;
}
.tools-title { font-size: 1.6rem; font-weight: 700; }
.tools-count { color: var(--color-text-secondary); font-size: 0.95rem; }

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}
.tool-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 20px; cursor: pointer;
    transition: all var(--transition);
    box-shadow: var(--shadow-card);
    display: flex; flex-direction: column; gap: 8px;
}
.tool-card:hover {
    transform: translateY(-2px);
    border-color: var(--color-accent-light);
    box-shadow: 0 12px 24px rgba(108,92,231,0.06);
}
.tool-card-header {
    display: flex; align-items: center; gap: 10px;
}
.tool-icon {
    font-size: 1.8rem; width: 40px; height: 40px;
    background: var(--color-accent-bg); border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
}
.tool-name { font-weight: 700; font-size: 1.05rem; }
.tool-desc {
    font-size: 0.85rem; color: var(--color-text-secondary);
    line-height: 1.4; flex: 1;
}
.tool-category-tag {
    font-size: 0.7rem; font-weight: 600; text-transform: uppercase;
    letter-spacing: 0.5px; color: var(--color-accent);
    background: var(--color-accent-bg); padding: 2px 8px;
    border-radius: 12px; align-self: flex-start;
}

.no-results {
    text-align: center; padding: 60px 20px;
    color: var(--color-text-secondary);
}
.load-more {
    display: block; margin: 32px auto 0; padding: 12px 32px;
    border-radius: 30px; background: var(--color-surface);
    border: 1px solid var(--color-border); font-weight: 600;
    color: var(--color-accent); cursor: pointer;
    font-size: 0.95rem; transition: all var(--transition);
}
.load-more:hover { background: var(--color-accent); color: #fff; }

/* ===== Footer ===== */
.footer {
    background: var(--color-surface); border-top: 1px solid var(--color-border);
    padding: 32px 20px; margin-top: 20px;
}
.footer-inner {
    max-width: 1280px; margin: 0 auto;
    display: flex; justify-content: space-between;
    flex-wrap: wrap; gap: 20px;
    color: var(--color-text-secondary); font-size: 0.9rem;
}
.footer-brand p { max-width: 280px; }
.footer-links {
    display: flex; gap: 20px; flex-wrap: wrap; align-items: center;
}
.footer-links a { color: var(--color-text-secondary); }
.footer-links a:hover { color: var(--color-accent); }

/* ===== Mobile ===== */
@media (max-width: 768px) {
    .header-inner { gap: 12px; }
    .search-wrap { max-width: 100%; }
    .tools-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
    .hero-stats { gap: 12px; }
}
@media (max-width: 480px) {
    .tools-grid { grid-template-columns: 1fr; }
    .logo-text { display: none; }
    .search-input { font-size: 0.9rem; padding-left: 36px; }
}