:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --primary: #38bdf8;
    --primary-hover: #0ea5e9;
    --accent: #818cf8;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --success: #22c55e;
    --warning: #eab308;
    --danger: #ef4444;
    --font-family: 'Inter', sans-serif;
    --radius: 16px;
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-family);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden; 
    position: relative;
}

/* Background Effects */
.background-blobs {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 10s infinite alternate ease-in-out;
}

.blob-1 {
    width: 400px;
    height: 400px;
    background: #4f46e5;
    top: -100px;
    left: -100px;
}

.blob-2 {
    width: 300px;
    height: 300px;
    background: #06b6d4;
    bottom: -50px;
    right: -50px;
    animation-delay: -5s;
}

.blob-3 {
    width: 200px;
    height: 200px;
    background: #ec4899;
    top: 40%;
    left: 40%;
    animation-duration: 15s;
}

@keyframes float {
    0% { transform: translate(0, 0); }
    100% { transform: translate(30px, 50px); }
}

.container {
    width: 100%;
    max-width: 600px; /* Slightly wider for new controls */
    padding: 20px;
    z-index: 10;
}

header {
    text-align: center;
    margin-bottom: 25px;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(to right, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
}

header p {
    color: var(--text-muted);
}

/* Glassmorphism Card */
.generator-card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: var(--glass-border);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* Display Section */
.display-container {
    background: rgba(15, 23, 42, 0.6);
    border-radius: 12px;
    padding: 20px;
    position: relative;
    margin-bottom: 25px;
    border: 1px solid rgba(255,255,255,0.05);
    transition: border-color 0.3s;
}

.display-container:hover {
    border-color: rgba(255,255,255,0.2);
}

.password-output {
    font-family: 'Courier New', Courier, monospace; 
    font-size: 1.4rem; /* Slightly smaller to accommodate longer strings */
    font-weight: 600;
    word-break: break-all;
    min-height: 1.8rem;
    color: var(--text-main);
    padding-right: 40px; 
}

.copy-btn {
    position: absolute;
    top: 50%;
    right: 15px;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--primary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.2s;
    padding: 5px;
}

.copy-btn:hover {
    color: var(--text-main);
    transform: translateY(-50%) scale(1.1);
}

.strength-bar-container {
    height: 4px;
    background: rgba(255,255,255,0.1);
    margin-top: 15px;
    border-radius: 2px;
    overflow: hidden;
}

.strength-bar {
    height: 100%;
    width: 0%;
    background: var(--danger);
    transition: width 0.3s ease, background-color 0.3s ease;
}

.strength-text {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: right;
    margin-top: 5px;
}

/* Tabs */
.tabs {
    display: flex;
    margin-bottom: 20px;
    background: rgba(0,0,0,0.2);
    padding: 4px;
    border-radius: 10px;
}

.tab-btn {
    flex: 1;
    background: none;
    border: none;
    padding: 10px;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s;
}

.tab-btn.active {
    background: rgba(255,255,255,0.1);
    color: var(--text-main);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* Controls */
.controls {
    display: none;
    animation: fadeIn 0.3s ease;
}

.controls.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

.slider-container {
    margin-bottom: 20px;
}

.slider-container label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-weight: 600;
    font-size: 0.9rem;
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(255,255,255,0.1);
    border-radius: 5px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    transition: background .15s ease-in-out;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--primary-hover);
}

.hint-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 15px;
    font-style: italic;
}

/* --- Advanced Options / Control Rows --- */
.advanced-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 25px;
}

.control-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.03);
    padding: 8px 12px;
    border-radius: 8px;
}

/* Custom Checkbox */
.checkbox-wrapper {
    display: flex;
    align-items: center;
    position: relative;
    padding-left: 30px;
    cursor: pointer;
    font-size: 0.9rem;
    user-select: none;
    color: var(--text-main);
    flex-grow: 1; /* Label takes available space */
}

.checkbox-wrapper input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 0;
    height: 20px;
    width: 20px;
    background-color: rgba(255,255,255,0.1);
    border-radius: 6px;
    transition: all 0.2s;
}

.checkbox-wrapper:hover input ~ .checkmark {
    background-color: rgba(255,255,255,0.2);
}

.checkbox-wrapper input:checked ~ .checkmark {
    background-color: var(--primary);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-wrapper input:checked ~ .checkmark:after {
    display: block;
}

.checkbox-wrapper .checkmark:after {
    left: 7px;
    top: 3px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Rule Selectors (Right side of row) */
.rule-selector {
    display: flex;
    gap: 8px;
    align-items: center;
    opacity: 0.5; /* Dimmed if checkbox unchecked, controlled by JS */
    pointer-events: none;
    transition: opacity 0.3s;
}

.control-row.active .rule-selector {
    opacity: 1;
    pointer-events: auto;
}

.rule-select {
    background: rgba(0,0,0,0.3);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-main);
    border-radius: 6px;
    padding: 4px 8px;
    font-size: 0.8rem;
    outline: none;
    cursor: pointer;
}

.rule-select:hover {
    border-color: rgba(255,255,255,0.3);
}

.rule-input {
    width: 50px;
    background: rgba(0,0,0,0.3);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-main);
    border-radius: 6px;
    padding: 4px;
    font-size: 0.8rem;
    outline: none;
    text-align: center;
}

.rule-input.hidden {
    display: none;
}

/* Generate Button */
.generate-btn {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -5px rgba(56, 189, 248, 0.4);
}

.generate-btn:active {
    transform: translateY(0);
}

.generate-btn i {
    margin-right: 8px;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--success);
    color: white;
    padding: 10px 20px;
    border-radius: 50px;
    font-weight: 600;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    opacity: 0;
    transition: all 0.3s;
    z-index: 100;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}