:root {
    /* Dark Theme (Default) */
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --text-color: #e0e0e0;
    --text-muted: #a0a0a0;
    --primary-color: #bb86fc;
    --primary-hover: #9965f4;
    --secondary-color: #03dac6;
    --error-color: #cf6679;
    --border-color: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
}

[data-theme="light"] {
    --bg-color: #f9fafb;
    --surface-color: #ffffff;
    --text-color: #111827;
    --text-muted: #6b7280;
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #10b981;
    --error-color: #ef4444;
    --border-color: rgba(0, 0, 0, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(0, 0, 0, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
}

/* Typography */
h1, h2, h3 { color: var(--text-color); font-weight: 600; }
p { color: var(--text-muted); }

/* Glassmorphism Panel */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}
.btn.primary { background-color: var(--primary-color); color: #fff; }
.btn.primary:hover { background-color: var(--primary-hover); transform: translateY(-2px); }
.btn.secondary { background-color: transparent; border: 1px solid var(--primary-color); color: var(--primary-color); }
.btn.secondary:hover { background-color: rgba(187, 134, 252, 0.1); }
.btn.text-btn { background: none; color: var(--text-muted); padding: 0; }
.btn.text-btn:hover { color: var(--primary-color); }
.btn-fast {
    background: rgba(187, 134, 252, 0.1);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-fast:hover {
    background: var(--primary-color);
    color: #fff;
}
.full-width { width: 100%; }

/* Inputs */
.input-group { margin-bottom: 1.5rem; }
.input-row { display: flex; gap: 1rem; }
.input-row .input-group { flex: 1; }
label { display: block; margin-bottom: 0.5rem; color: var(--text-muted); font-size: 0.9rem; }
input[type="text"], input[type="password"], input[type="number"], input[type="date"], input[type="time"] {
    width: 100%; padding: 0.75rem; border-radius: 8px;
    border: 1px solid var(--border-color); background-color: var(--surface-color);
    color: var(--text-color); font-size: 1rem; transition: border-color 0.2s;
}
input:focus { outline: none; border-color: var(--primary-color); }

/* Navbar */
.navbar { display: flex; justify-content: space-between; align-items: center; padding: 1rem 5%; border-bottom: 1px solid var(--border-color); background-color: var(--surface-color); }
.nav-brand { font-size: 1.5rem; font-weight: 700; color: var(--primary-color); }
.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links a { color: var(--text-muted); text-decoration: none; font-weight: 500; }
.nav-links a.active, .nav-links a:hover { color: var(--primary-color); }

/* Theme Toggle */
.theme-switch-wrapper { display: flex; align-items: center; gap: 0.5rem; }
.theme-switch { position: relative; display: inline-block; width: 50px; height: 24px; }
.theme-switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: var(--border-color); transition: .4s; border-radius: 34px; }
.slider:before { position: absolute; content: ""; height: 16px; width: 16px; left: 4px; bottom: 4px; background-color: white; transition: .4s; border-radius: 50%; }
input:checked + .slider { background-color: var(--primary-color); }
input:checked + .slider:before { transform: translateX(26px); }

/* Layouts */
.auth-container { max-width: 400px; margin: 4rem auto; text-align: center; }
.auth-container h1 { margin-bottom: 0.5rem; }
.auth-container p { margin-bottom: 2rem; }
.auth-container .actions { display: flex; gap: 1rem; margin-top: 1rem; }

.dashboard-container { max-width: 1200px; margin: 2rem auto; padding: 0 5%; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; margin-bottom: 2rem; }
.stat-card { text-align: center; padding: 2rem; }
.stat-card h3 { font-size: 1rem; color: var(--text-muted); margin-bottom: 0.5rem; font-weight: 500;}
.stat-card h2 { font-size: 2.5rem; color: var(--primary-color); }
.stat-card.highlight { border-color: var(--primary-color); }

.main-grid { display: grid; grid-template-columns: 1fr 1.5fr; gap: 2rem; }
@media (max-width: 768px) { .main-grid { grid-template-columns: 1fr; } .nav-links { display: none; } } /* simplified for mobile */

/* Lists */
.entries-list { display: flex; flex-direction: column; gap: 1rem; margin-top: 1rem; }
.entry-item { display: flex; justify-content: space-between; padding: 1rem; background-color: var(--surface-color); border-radius: 8px; border: 1px solid var(--border-color); }
.empty-state { text-align: center; color: var(--text-muted); padding: 2rem; font-style: italic; }

.error-msg { color: var(--error-color); margin-top: 1rem; font-size: 0.9rem; }
.success-msg { color: var(--secondary-color); margin-top: 1rem; font-size: 0.9rem; }