/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Cyber Green Theme (Default) */
    --primary-color: #10b981;
    --primary-glow: rgba(16, 185, 129, 0.3);
    --secondary-color: #059669;
    --accent-color: #34d399;
    --bg-gradient-1: #000000;
    --bg-gradient-2: #0a0a0a;
    --bg-gradient-3: #001a0f;
    --card-bg: rgba(10, 10, 10, 0.8);
    --card-border: rgba(16, 185, 129, 0.3);
    --text-primary: #e4e4e4;
    --text-secondary: #a0a0a0;
    --input-bg: rgba(0, 0, 0, 0.5);
    --input-border: rgba(16, 185, 129, 0.3);
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
}

body.blue-theme {
    /* Blue/Purple Tech Theme */
    --primary-color: #6366f1;
    --primary-glow: rgba(99, 102, 241, 0.3);
    --secondary-color: #4f46e5;
    --accent-color: #818cf8;
    --bg-gradient-1: #000000;
    --bg-gradient-2: #0a0a14;
    --bg-gradient-3: #0f0a1a;
    --card-bg: rgba(10, 10, 20, 0.8);
    --card-border: rgba(99, 102, 241, 0.3);
    --text-primary: #e4e4e4;
    --text-secondary: #a0a0a0;
    --input-bg: rgba(0, 0, 10, 0.5);
    --input-border: rgba(99, 102, 241, 0.3);
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-1) 0%, var(--bg-gradient-2) 50%, var(--bg-gradient-3) 100%);
    min-height: 100vh;
    color: var(--text-primary);
    padding: 20px;
    position: relative;
    overflow-x: hidden;
}

/* ===== ANIMATED BACKGROUND ===== */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background: 
        radial-gradient(circle at 20% 50%, var(--primary-glow) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, var(--primary-glow) 0%, transparent 50%),
        radial-gradient(circle at 50% 20%, var(--primary-glow) 0%, transparent 50%);
    animation: bgPulse 10s ease-in-out infinite;
}

@keyframes bgPulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.6; }
}

/* ===== CONTAINER ===== */
.container {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.6s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== HEADER ===== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    animation: slideDown 0.8s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-icon {
    font-size: 2.5em;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

h1 {
    font-size: 2.2em;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.theme-toggle {
    background: var(--card-bg);
    border: 2px solid var(--card-border);
    border-radius: 12px;
    padding: 12px 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.2em;
}

.theme-toggle:hover {
    background: var(--primary-color);
    transform: scale(1.1) rotate(90deg);
    box-shadow: 0 0 20px var(--primary-glow);
}

/* ===== SUBTITLE ===== */
.subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-size: 1em;
    animation: fadeIn 1s ease 0.3s backwards;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ===== TABS ===== */
.tabs {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    animation: fadeIn 1s ease 0.5s backwards;
}

.tab-btn {
    flex: 1;
    padding: 16px 24px;
    background: var(--card-bg);
    border: 2px solid var(--card-border);
    border-radius: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 1em;
    font-weight: 600;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 20px var(--primary-glow);
}

.tab-icon {
    font-size: 1.3em;
}

/* ===== TAB CONTENT ===== */
.tab-content {
    display: none;
    animation: fadeInScale 0.5s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ===== TOOL CARD ===== */
.tool-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 2px solid var(--card-border);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    transition: all 0.3s ease;
}

.tool-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 12px 40px var(--primary-glow);
}

.section-title {
    color: var(--primary-color);
    font-size: 1.8em;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ===== PASSWORD DISPLAY ===== */
.password-display {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.password-display input {
    flex: 1;
    padding: 18px 20px;
    background: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1.1em;
    font-family: 'Courier New', monospace;
    transition: all 0.3s ease;
}

.password-display input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-glow);
}

.icon-btn {
    background: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: 12px;
    padding: 15px 18px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.2em;
}

.icon-btn:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: scale(1.1);
    box-shadow: 0 4px 15px var(--primary-glow);
}

/* ===== STRENGTH METER ===== */
.strength-meter {
    margin-bottom: 30px;
}

.strength-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 0.95em;
}

.strength-label span:last-child {
    color: var(--primary-color);
    font-weight: 600;
}

.strength-bar-container {
    height: 10px;
    background: var(--input-bg);
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--input-border);
}

.strength-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 10px;
    transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.strength-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.3) 50%, transparent 100%);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* ===== OPTIONS GRID ===== */
.options-grid {
    display: grid;
    gap: 20px;
    margin-bottom: 25px;
}

.option-group {
    background: rgba(0, 0, 0, 0.3);
    padding: 15px 20px;
    border-radius: 12px;
    border: 1px solid var(--input-border);
}

.option-header {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--text-primary);
}

/* ===== CUSTOM CHECKBOX ===== */
.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    position: relative;
    padding-left: 35px;
    user-select: none;
}

.checkbox-label input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkmark {
    position: absolute;
    left: 0;
    height: 22px;
    width: 22px;
    background-color: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: 6px;
    transition: all 0.3s ease;
}

.checkbox-label:hover .checkmark {
    border-color: var(--primary-color);
}

.checkbox-label input:checked ~ .checkmark {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: var(--primary-color);
}

.checkmark::after {
    content: "✓";
    position: absolute;
    display: none;
    color: white;
    font-size: 14px;
    font-weight: bold;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

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

/* ===== SLIDER ===== */
.slider {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: var(--input-bg);
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    cursor: pointer;
    box-shadow: 0 0 10px var(--primary-glow);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    cursor: pointer;
    box-shadow: 0 0 10px var(--primary-glow);
    border: none;
}

/* ===== BUTTONS ===== */
.primary-btn {
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px var(--primary-glow);
}

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

.secondary-btn {
    padding: 12px 20px;
    background: var(--input-bg);
    color: var(--text-primary);
    border: 2px solid var(--input-border);
    border-radius: 10px;
    font-size: 0.95em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.secondary-btn:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* ===== ADVANCED OPTIONS ===== */
.toggle-advanced {
    width: 100%;
    padding: 12px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--input-border);
    border-radius: 10px;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 20px 0;
    transition: all 0.3s ease;
}

.toggle-advanced:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.toggle-advanced .arrow {
    transition: transform 0.3s ease;
}

.toggle-advanced.active .arrow {
    transform: rotate(180deg);
}

.advanced-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.4s ease;
    opacity: 0;
}

.advanced-panel.show {
    max-height: 500px;
    opacity: 1;
    margin-bottom: 20px;
}

.advanced-grid {
    display: grid;
    gap: 20px;
    background: rgba(0, 0, 0, 0.3);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--input-border);
}

.advanced-option label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-secondary);
    font-size: 0.9em;
    font-weight: 600;
}

.select-input {
    width: 100%;
    padding: 12px 15px;
    background: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 1em;
    cursor: pointer;
    transition: all 0.3s ease;
}

.select-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* ===== BULK PASSWORDS ===== */
.bulk-passwords {
    margin-top: 20px;
    padding: 20px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    border: 1px solid var(--input-border);
}

.bulk-passwords h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.password-list {
    display: grid;
    gap: 10px;
}

.password-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 15px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.95em;
}

.password-item button {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    font-size: 1.1em;
    padding: 5px 10px;
    transition: all 0.3s ease;
}

.password-item button:hover {
    transform: scale(1.2);
}

/* ===== ENCRYPTION TAB ===== */
.mode-toggle {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}

.mode-btn {
    flex: 1;
    padding: 14px 20px;
    background: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: 10px;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 1em;
    font-weight: 600;
    transition: all 0.3s ease;
}

.mode-btn:hover {
    border-color: var(--primary-color);
}

.mode-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.input-group,
.output-group {
    margin-bottom: 25px;
}

.input-group label,
.output-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-weight: 600;
}

textarea {
    width: 100%;
    padding: 15px;
    background: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1em;
    font-family: 'Courier New', monospace;
    resize: vertical;
    transition: all 0.3s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-glow);
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

/* ===== CIPHER SELECTION ===== */
.cipher-selection {
    margin-bottom: 25px;
}

.cipher-selection label {
    display: block;
    margin-bottom: 15px;
    color: var(--text-primary);
    font-weight: 600;
}

.cipher-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
}

.cipher-btn {
    padding: 12px 15px;
    background: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: 10px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.cipher-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.cipher-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.cipher-name {
    font-weight: 600;
    font-size: 0.9em;
}

.cipher-info {
    font-size: 0.9em;
    opacity: 0.7;
    cursor: help;
}

/* ===== KEY INPUT ===== */
.key-input-group {
    margin-bottom: 25px;
}

.key-input-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-weight: 600;
}

.key-input-group input {
    width: 100%;
    padding: 14px 18px;
    background: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 1em;
    transition: all 0.3s ease;
}

.key-input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-glow);
}

/* ===== INFO BOX ===== */
.info-box {
    margin-top: 25px;
    padding: 20px;
    background: rgba(0, 0, 0, 0.3);
    border-left: 4px solid var(--primary-color);
    border-radius: 10px;
}

.info-box h4 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 1.1em;
}

.info-box p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 8px;
}

.info-box p:last-child {
    margin-bottom: 0;
}

/* ===== FOOTER ===== */
.footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--input-border);
    color: var(--text-secondary);
    font-size: 0.9em;
}

.footer p {
    margin-bottom: 8px;
}

.footer-note {
    color: var(--warning-color);
    font-weight: 600;
}

/* ===== TOAST NOTIFICATION ===== */
.toast {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 16px 32px;
    border-radius: 12px;
    box-shadow: 0 8px 30px var(--primary-glow);
    font-weight: 600;
    z-index: 1000;
    transition: bottom 0.4s ease;
}

.toast.show {
    bottom: 30px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .tool-card {
        padding: 25px;
    }

    h1 {
        font-size: 1.8em;
    }

    .tabs {
        flex-direction: column;
    }

    .cipher-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .password-display {
        flex-direction: column;
    }
}