:root {
    --primary-color: #4a90e2;
    --secondary-color: #6c757d;
    --accent-color: #e91e63;
    --bg-color: #f0f2f5;
    --card-bg: #ffffff;
    --text-color: #212529;
    --text-muted: #6c757d;
    --control-bg: #f8f9fa;
    --border-color: #dee2e6;
    --result-bg: #212529;
    --result-text: #00ff41;
    --shadow-soft: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-deep: 0 10px 25px rgba(0, 0, 0, 0.1);
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-color: #0f111a;
    --card-bg: #1a1c27;
    --text-color: #e6e9ef;
    --text-muted: #8b95a5;
    --control-bg: #232635;
    --border-color: #2f344a;
    --result-bg: #000000;
    --result-text: #39ff14;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Pretendard', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    padding: 30px 15px;
    min-height: 100vh;
    transition: background-color 0.5s ease;
}

.app-container { max-width: 1200px; width: 100%; }

header { text-align: center; margin-bottom: 40px; position: relative; }

.settings-panel {
    display: flex;
    gap: 15px;
    align-items: center;
    justify-content: flex-end;
    margin-bottom: 15px;
}

.bulk-setting {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--control-bg);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
}

.bulk-setting select {
    background: transparent;
    border: none;
    color: var(--text-color);
    font-weight: 700;
    cursor: pointer;
}

.icon-btn {
    background: var(--control-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    width: 36px; height: 36px; border-radius: 50%;
    cursor: pointer; transition: var(--transition);
}

.lang-selector {
    display: flex; background: var(--control-bg);
    border: 1px solid var(--border-color); border-radius: 20px; padding: 3px;
}

.lang-btn {
    border: none; background: transparent; color: var(--text-muted);
    padding: 4px 10px; border-radius: 17px; font-size: 0.75rem; font-weight: 700;
    cursor: pointer; transition: var(--transition);
}

.lang-btn.active { background: var(--primary-color); color: white; }

header h1 {
    font-size: 2.5rem; font-weight: 800; margin-bottom: 10px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}

.main-layout {
    display: grid; grid-template-columns: 1fr 320px; gap: 30px;
}

@media (max-width: 1000px) {
    .main-layout { grid-template-columns: 1fr; }
}

.generator-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(400px, 1fr)); gap: 20px;
}

@media (max-width: 500px) { .generator-grid { grid-template-columns: 1fr; } }

.generator-card {
    background: var(--card-bg); border-radius: var(--border-radius);
    padding: 25px; box-shadow: var(--shadow-soft); border: 1px solid var(--border-color);
    transition: var(--transition); display: flex; flex-direction: column;
}

.header-tools { display: flex; gap: 8px; }
.tool-btn {
    background: var(--control-bg); border: 1px solid var(--border-color);
    border-radius: 8px; width: 32px; height: 32px; cursor: pointer; transition: var(--transition);
}

.control-group { background: var(--control-bg); border-radius: 12px; padding: 18px; margin-bottom: 15px; }
.slider-info { margin-bottom: 15px; }
.slider-info span { color: var(--primary-color); font-weight: 800; }

.strength-meter-container { margin-top: 15px; }
.strength-label { font-size: 0.8rem; margin-bottom: 5px; font-weight: 600; }
.strength-bar { height: 6px; background: var(--border-color); border-radius: 3px; overflow: hidden; }
#strength-fill { height: 100%; width: 0%; transition: width 0.5s ease, background-color 0.5s ease; }

.result-display {
    background-color: var(--result-bg); color: var(--result-text);
    border-radius: 10px; padding: 20px; text-align: left;
    margin-bottom: 20px; min-height: 80px; font-family: 'JetBrains Mono', monospace;
    font-size: 1.1rem; overflow-y: auto; max-height: 200px;
}

.multi-result div { border-bottom: 1px solid rgba(255,255,255,0.1); padding: 5px 0; }
.multi-result div:last-child { border-bottom: none; }

.history-panel {
    background: var(--card-bg); border-radius: var(--border-radius);
    padding: 25px; border: 1px solid var(--border-color);
    max-height: 800px; display: flex; flex-direction: column;
}

.history-header { display: flex; justify-content: space-between; margin-bottom: 20px; align-items: center; }
.text-link { background: none; border: none; color: var(--primary-color); font-size: 0.85rem; cursor: pointer; text-decoration: underline; }

.history-list { list-style: none; overflow-y: auto; flex: 1; }
.history-item {
    padding: 12px; border-bottom: 1px solid var(--border-color);
    display: flex; flex-direction: column; gap: 5px; cursor: pointer; transition: var(--transition);
}
.history-item:hover { background: var(--control-bg); }
.history-item .val { font-family: 'JetBrains Mono', monospace; font-weight: 600; font-size: 0.9rem; word-break: break-all; }
.history-item .meta { font-size: 0.7rem; color: var(--text-muted); display: flex; justify-content: space-between; }

/* Modal */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,0.7); display: flex; align-items: center; justify-content: center; z-index: 3000; }
.modal.hidden { display: none; }
.modal-content { background: var(--card-bg); padding: 40px; border-radius: 20px; text-align: center; max-width: 400px; width: 90%; }
#qrcode { display: flex; justify-content: center; margin: 20px 0; }
#qrcode img { border: 10px solid white; border-radius: 10px; }

#toast {
    position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%);
    background: var(--result-bg); color: white; padding: 12px 30px; border-radius: 50px; z-index: 4000;
}
.toast-hidden { opacity: 0; visibility: hidden; }
.toast-visible { opacity: 1; visibility: visible; }