:root {
    --bg: #0f172a; --card: #1e293b; --text: #f8fafc; --accent: #38bdf8; --border: #334155; --font-main: 'Outfit', sans-serif;
}

[data-theme="light"] {
    --bg: #f1f5f9; --card: #ffffff; --text: #0f172a; --accent: #2563eb; --border: #cbd5e1;
}

[data-theme="synthwave"] {
    --bg: #2d0b5a; --card: #450a7a; --text: #00fff2; --accent: #ff00ff; --border: #ff00ff;
}

[data-theme="matrix"] {
    --bg: #000000; --card: #050505; --text: #00ff41; --accent: #00ff41; --border: #00ff41;
    --font-main: 'JetBrains Mono', monospace;
}

[data-theme="dracula"] {
    --bg: #282a36; --card: #44475a; --text: #f8f8f2; --accent: #bd93f9; --border: #6272a4;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

body {
    background-color: var(--bg); color: var(--text);
    font-family: var(--font-main); margin: 0; padding: 0;
    transition: background 0.3s ease;
}

.app-wrapper { max-width: 900px; margin: 0 auto; padding: 10px; }

.main-header {
    position: sticky; top: 0; background: var(--bg); z-index: 100;
    padding: 10px 0; border-bottom: 1px solid var(--border);
}

.header-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; }
.logo { font-weight: 800; font-size: 1.4rem; letter-spacing: -1px; }
.logo span { color: var(--accent); }

.theme-picker {
    background: var(--card); color: var(--text); border: 1px solid var(--border);
    padding: 6px; border-radius: 8px; font-size: 0.8rem;
}

.search-bar input {
    width: 100%; padding: 14px; border-radius: 12px; border: 2px solid var(--border);
    background: var(--card); color: var(--text); font-size: 1rem; outline: none;
}

.category-nav { display: flex; gap: 8px; overflow-x: auto; padding: 10px 0; scrollbar-width: none; }
.category-nav::-webkit-scrollbar { display: none; }

.nav-btn {
    background: var(--card); border: 1px solid var(--border); color: var(--text);
    padding: 8px 16px; border-radius: 20px; font-weight: 600; font-size: 0.75rem; white-space: nowrap;
}

.nav-btn.active { background: var(--accent); color: #000; border-color: var(--accent); }

/* Grid */
.substance-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 12px; padding: 15px 0;
}

.card {
    background: var(--card); border: 1px solid var(--border); padding: 15px;
    border-radius: 16px; transition: transform 0.1s;
}

.card:active { transform: scale(0.96); }
.card h3 { margin: 5px 0; font-size: 1.1rem; line-height: 1.2; }
.card .chem-name { font-size: 0.7rem; opacity: 0.6; display: block; height: 30px; overflow: hidden; }

/* Modal */
.modal-overlay {
    display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.8);
    backdrop-filter: blur(8px); z-index: 1000; align-items: center; justify-content: center;
}

.modal-card {
    background: var(--bg); width: 92%; max-width: 500px; border-radius: 24px;
    padding: 25px; border: 1px solid var(--accent); max-height: 85vh; overflow-y: auto;
}

.cat-badge { background: var(--accent); color: #000; font-size: 0.7rem; font-weight: 800; padding: 4px 10px; border-radius: 6px; }
.close-modal { background: none; border: none; color: var(--text); font-size: 2rem; cursor: pointer; }

.dose-table { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; margin: 20px 0; }
.dose-item { background: var(--card); padding: 12px; border-radius: 12px; text-align: center; }
.dose-item span { display: block; font-size: 0.65rem; font-weight: 800; margin-bottom: 5px; color: var(--accent); }

.info-block { margin-bottom: 15px; }
.info-block h4 { font-size: 0.8rem; text-transform: uppercase; opacity: 0.5; margin-bottom: 5px; }
.info-block p { font-size: 0.95rem; line-height: 1.5; }