:root {
    --bg: #f4f7f9;
    --card-bg: #ffffff;
    --text-main: #1a1c20;
    --text-muted: #64748b;
    --accent: #4361ee;
    --border: #e2e8f0;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
    --bg: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

* { margin: 0; padding: 0; box-sizing: border-box; transition: background 0.3s, color 0.3s, border-color 0.3s; }
body { background: var(--bg); color: var(--text-main); font-family: 'Plus Jakarta Sans', sans-serif; line-height: 1.5; }

.wrapper { max-width: 500px; margin: 0 auto; padding: 40px 20px; }

/* Navigation */
nav { display: flex; justify-content: space-between; align-items: center; margin-bottom: 30px; }
.back-link { text-decoration: none; color: var(--accent); font-weight: 600; font-size: 0.9rem; }

#theme-toggle {
    background: var(--card-bg); border: 1px solid var(--border); color: var(--text-main);
    width: 40px; height: 40px; border-radius: 12px; cursor: pointer;
    display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow);
}

header { text-align: center; margin-bottom: 30px; }
header h1 { font-size: 2rem; letter-spacing: -1px; margin-bottom: 5px; }
header p { color: var(--text-muted); font-size: 0.95rem; }

.card {
    background: var(--card-bg); border: 1px solid var(--border);
    padding: 30px; border-radius: 24px; box-shadow: var(--shadow);
}

/* Password Display & Copy Button */
.output-container {
    display: flex; background: var(--bg); padding: 15px; align-items: center;
    border-radius: 12px; border: 1px solid var(--border); margin-bottom: 10px;
}
#password-display {
    flex: 1; border: none; background: transparent; width: 100%;
    font-family: 'JetBrains Mono', monospace; font-size: 1.1rem; color: var(--text-main);
    outline: none;
}
#copy-btn {
    background: transparent; border: none; color: var(--accent); cursor: pointer; 
    padding: 5px; min-width: 40px; display: flex; justify-content: center; align-items: center;
}

.strength-meter { height: 6px; background: var(--border); border-radius: 3px; margin-bottom: 20px; overflow: hidden; }
#strength-bar { height: 100%; width: 0%; transition: width 0.3s, background 0.3s; }

/* Analytics */
.analytics-row { display: flex; gap: 15px; margin-bottom: 30px; }
.stat {
    flex: 1; background: var(--bg); padding: 12px;
    border-radius: 12px; border: 1px solid var(--border);
}
.stat-label { display: block; font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; font-weight: 700; }
.stat-value { font-size: 0.9rem; font-weight: 600; color: var(--text-main); }

/* Controls & Synced Input */
.setting { margin-bottom: 25px; }
.label-group { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; font-weight: 600; font-size: 0.9rem; }

#length-num {
    width: 60px; background: var(--bg); border: 1px solid var(--border);
    color: var(--text-main); border-radius: 8px; padding: 5px;
    text-align: center; font-family: inherit; font-size: 0.9rem; outline: none;
}
#length-num:focus { border-color: var(--accent); }
input[type="range"] { width: 100%; accent-color: var(--accent); cursor: pointer; }

.options-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 25px 0; }
.check-container { display: flex; align-items: center; gap: 10px; font-size: 0.9rem; cursor: pointer; }

#generate-btn {
    width: 100%; background: var(--accent); color: white;
    border: none; padding: 16px; border-radius: 14px;
    font-weight: 700; cursor: pointer; font-size: 1rem;
}
#generate-btn:active { transform: scale(0.98); }

/* Mobile Adjustments */
@media (max-width: 450px) {
    .analytics-row { flex-direction: column; gap: 10px; }
    .card { padding: 20px; }
    #password-display { font-size: 1rem; }
}