@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap");

/* ============================================ */
/* CSS VARIABLES (THEMES) */
/* ============================================ */
:root {
    /* Dark theme - softer, professional, less aggressive */
    --bg-primary: #1e1e24;
    --bg-secondary: rgba(255, 255, 255, 0.04);
    --bg-tertiary: rgba(255, 255, 255, 0.07);
    --text-primary: #e4e4e7;
    --text-secondary: rgba(228, 228, 231, 0.7);
    --text-muted: rgba(228, 228, 231, 0.4);
    --border-color: rgba(255, 255, 255, 0.08);
    --accent: #5c82e0;       /* Muted, professional blue */
    --accent-hover: #7094e8;
    --accent-glow: rgba(92, 130, 224, 0.15);
    --weak: #ef4444;
    --medium: #f59e0b;
    --strong: #10b981;
    --shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.5);
    --blur: 20px;
}

body.light-theme {
    /* Light theme - soft, easy on the eyes */
    --bg-primary: #f0f2f5;
    --bg-secondary: rgba(255, 255, 255, 0.85);
    --bg-tertiary: rgba(240, 242, 245, 0.8);
    --text-primary: #1e293b;
    --text-secondary: rgba(30, 41, 59, 0.7);
    --text-muted: rgba(30, 41, 59, 0.5);
    --border-color: rgba(0, 0, 0, 0.08);
    --accent: #5c82e0;       /* Same muted blue for consistency */
    --accent-hover: #4a75c4;
    --accent-glow: rgba(92, 130, 224, 0.1);
    --shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.08);
}

/* ============================================ */
/* BASE */
/* ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
    transition: background 0.3s ease, color 0.3s ease;
    position: relative;
}

/* ============================================ */
/* THEME TOGGLE */
/* ============================================ */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-secondary);
    backdrop-filter: blur(var(--blur));
    -webkit-backdrop-filter: blur(var(--blur));
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 100;
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    transform: scale(1.05);
}

.theme-icon {
    font-size: 20px;
}

/* ============================================ */
/* CONTAINER */
/* ============================================ */
.container {
    width: 480px;
    max-width: 100%;
    background: var(--bg-secondary);
    backdrop-filter: blur(var(--blur));
    -webkit-backdrop-filter: blur(var(--blur));
    border: 1px solid var(--border-color);
    border-radius: 20px;
    box-shadow: var(--shadow);
    overflow: hidden;
    animation: slideUp 0.4s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============================================ */
/* HEADER */
/* ============================================ */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.75rem;
    border-bottom: 1px solid var(--border-color);
}

.header-title {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon { font-size: 24px; }

.header h2 {
    font-weight: 600;
    font-size: 1.15rem;
    letter-spacing: -0.01em;
}

.version-badge {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 4px 10px;
    background: var(--accent);
    color: white;
    border-radius: 20px;
    letter-spacing: 0.05em;
}

/* ============================================ */
/* WRAPPER */
/* ============================================ */
.wrapper { padding: 1.5rem 1.75rem 1.75rem; }

/* ============================================ */
/* PASSWORD INPUT */
/* ============================================ */
.input-box {
    position: relative;
    margin-bottom: 1rem;
}

.input-box input {
    width: 100%;
    height: 60px;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.1rem;
    font-weight: 500;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 0 7rem 0 1.25rem;
    letter-spacing: 1.5px;
    transition: all 0.2s ease;
    cursor: text;
}

.input-box input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-actions {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    gap: 4px;
}

.action-icon {
    font-size: 20px;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 8px;
    border-radius: 8px;
    outline: none;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

.action-icon:hover {
    color: var(--accent);
    background: var(--bg-tertiary);
}

.action-icon:focus {
    color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

/* ============================================ */
/* PASSWORD STATS */
/* ============================================ */
.password-stats { margin-bottom: 0.75rem; }

.stat-item {
    background: var(--bg-tertiary);
    padding: 10px 14px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.stat-label {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.strength-text {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    transition: color 0.3s ease;
}

.strength-text.weak { color: var(--weak); }
.strength-text.medium { color: var(--medium); }
.strength-text.strong { color: var(--strong); }

/* ============================================ */
/* STRENGTH INDICATOR */
/* ============================================ */
.pass-indicator {
    width: 100%;
    height: 5px;
    position: relative;
    background: var(--border-color);
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.pass-indicator::before {
    content: "";
    position: absolute;
    height: 100%;
    width: 0%;
    background: var(--text-muted);
    border-radius: inherit;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1), background 0.4s ease;
}

.pass-indicator#weak::before { width: 33%; background: var(--weak); }
.pass-indicator#medium::before { width: 66%; background: var(--medium); }
.pass-indicator#strong::before { width: 100%; background: var(--strong); }

/* ============================================ */
/* LENGTH SLIDER */
/* ============================================ */
.pass-length { margin-bottom: 1.5rem; }

.pass-length .details {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.pass-length .title {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.length-value {
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.95rem;
    background: var(--bg-tertiary);
    padding: 3px 12px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.pass-length input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 5px;
    background: var(--border-color);
    outline: none;
    cursor: pointer;
}

.pass-length input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 6px var(--accent-glow);
    border: 3px solid var(--bg-primary);
}

.pass-length input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.pass-length input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: 3px solid var(--bg-primary);
    box-shadow: 0 2px 6px var(--accent-glow);
}

/* ============================================ */
/* SETTINGS */
/* ============================================ */
.pass-settings { margin-bottom: 1.5rem; }

.pass-settings .title {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
    display: block;
}

.pass-settings .options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem;
    list-style: none;
}

.option { display: flex; align-items: center; }
.option input[type="checkbox"] { display: none; }

.option label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 10px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    transition: all 0.2s ease;
    width: 100%;
    user-select: none;
}

.option label:hover { border-color: var(--accent); }

.option input:checked + label {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.check-box {
    width: 18px;
    height: 18px;
    border: 2px solid var(--text-muted);
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
    position: relative;
}

.option input:checked + label .check-box {
    background: white;
    border-color: white;
}

.option input:checked + label .check-box::after {
    content: "✓";
    color: var(--accent);
    font-size: 12px;
    font-weight: 700;
}

.option-text {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: color 0.2s ease;
}

.option input:checked + label .option-text { color: white; }

.option-text .hint {
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 400;
}

.option input:checked + label .option-text .hint {
    color: rgba(255, 255, 255, 0.7);
}

/* ============================================ */
/* GENERATE BUTTON */
/* ============================================ */
.generate-btn {
    width: 100%;
    color: white;
    background: var(--accent);
    border: none;
    outline: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
    padding: 1rem 0;
    border-radius: 12px;
    transition: all 0.2s ease;
}

.generate-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.generate-btn:active { transform: translateY(0); }
.generate-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* ============================================ */
/* KEYBOARD SHORTCUTS HINT */
/* ============================================ */
.shortcuts-hint {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 1rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.shortcuts-hint kbd {
    display: inline-block;
    padding: 2px 6px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* ============================================ */
/* TOAST NOTIFICATION */
/* ============================================ */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-secondary);
    backdrop-filter: blur(var(--blur));
    -webkit-backdrop-filter: blur(var(--blur));
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px 20px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow);
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
    z-index: 1000;
}

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

.toast-icon { color: var(--strong); font-size: 22px; }
.toast-text { font-weight: 500; font-size: 0.9rem; }

/* ============================================ */
/* HISTORY PANEL */
/* ============================================ */
.history-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--accent);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 99;
}

.history-toggle:hover {
    transform: scale(1.05);
    background: var(--accent-hover);
}

.history-panel {
    position: fixed;
    top: 0;
    right: -400px;
    width: 380px;
    max-width: 90%;
    height: 100vh;
    background: var(--bg-secondary);
    backdrop-filter: blur(var(--blur));
    -webkit-backdrop-filter: blur(var(--blur));
    border-left: 1px solid var(--border-color);
    padding: 1.5rem;
    transition: right 0.3s ease;
    z-index: 200;
    overflow-y: auto;
}

.history-panel.open { right: 0; }

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.history-header h3 { font-size: 1.1rem; font-weight: 600; }

.history-close {
    background: var(--bg-tertiary);
    border: none;
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.history-close:hover { background: var(--accent); color: white; }

.history-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.history-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    transition: all 0.2s ease;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}

.history-item:hover { border-color: var(--accent); }

.history-password {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--text-primary);
    word-break: break-all;
    flex: 1;
}

.history-copy {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
}

.history-copy:hover {
    color: var(--accent);
    background: var(--bg-secondary);
}

/* ============================================ */
/* RESPONSIVE */
/* ============================================ */
@media (max-width: 500px) {
    .wrapper { padding: 1.25rem; }
    .header { padding: 1rem 1.25rem; }
    .pass-settings .options { grid-template-columns: 1fr; }
    .input-box input { padding: 0 6rem 0 1rem; font-size: 1rem; }
    .shortcuts-hint { display: none; }
}

/* Custom scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 4px; }