:root {
    --primary-color: #3B82F6;
    --secondary-color: #10B981;
    --accent-color: #8B5CF6;
    --text-color: #111827;
    --text-secondary: #4B5563;
    --text-tertiary: #6B7280;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --border-color: #E5E7EB;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius-base: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;    
    --radius-2xl: 1.5rem;
    
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    
    --danger-color: #EF4444;
    --danger-light: #FCA5A5;
    --success-color: #10B981;
    --warning-color: #F59E0B;
    
    --brand-primary: var(--primary-color);
    --brand-secondary: var(--secondary-color);
    --text-primary: var(--text-color);
}

[data-theme="dark"] {
    --text-color: #F9FAFB;
    --text-secondary: #D1D5DB;
    --text-tertiary: #9CA3AF;
    --bg-primary: #111827;
    --bg-secondary: #1F2937;
    --bg-tertiary: #374151;
    --border-color: #374151;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
}

body {
    background: var(--bg-primary);
}

[data-theme="dark"] body {
    background: var(--bg-primary);
}

/* Hero Section */
.tool-hero {
    margin-top: 0;
    padding: 120px 0 80px;
    position: relative;
    z-index: 2;
    background: linear-gradient(135deg, var(--bg-primary) 0%, rgba(59, 130, 246, 0.1) 30%, rgba(16, 185, 129, 0.1) 70%, var(--bg-primary) 100%);
    overflow: hidden;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 3;
}

.hero-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100px;
    height: 100px;
    margin: 0 auto 30px auto;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
    border-radius: 50%;
    box-shadow: 
        0 15px 35px rgba(59, 130, 246, 0.4),
        0 0 0 10px rgba(59, 130, 246, 0.1),
        0 0 0 20px rgba(59, 130, 246, 0.05);
}

.hero-icon i {
    font-size: 2.5rem;
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin: 0 0 1.5rem 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto;
}

@keyframes heroBackgroundPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

/* Calculator Section */
.calculator-main {
    padding: 0 0 100px 0;
    position: relative;
    z-index: 1;
}

.calculator-container {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    gap: 2rem;
}

.calculator-card {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    position: relative;
    overflow: hidden;
}

.calculator-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-color);
    border-radius: 3px 3px 0 0;
}

/* Privacy Notice */
.privacy-notice {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(16, 185, 129, 0.2);
    margin-bottom: 2rem;
}

.privacy-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
    border-radius: 50%;
    flex-shrink: 0;
}

.privacy-icon i {
    font-size: 1.25rem;
    color: white;
}

.privacy-text strong {
    display: block;
    color: var(--text-color);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.privacy-text p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.9rem;
}

/* Form Elements */
.input-section {
    margin-bottom: 2rem;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
    font-size: 0.9rem;
}

.input-group input,
.input-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    background: var(--bg-primary);
    color: var(--text-color);
    transition: all 0.3s ease;
    font-family: inherit;
    resize: vertical;
}

.input-group input:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.input-group textarea {
    min-height: 120px;
    line-height: 1.5;
}

/* Password Input */
.password-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.password-toggle {
    position: absolute;
    right: 1rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-base);
    transition: all 0.3s ease;
    z-index: 2;
}

.password-toggle:hover {
    color: var(--primary-color);
    background: rgba(59, 130, 246, 0.1);
}

.password-input-wrapper input {
    padding-right: 3rem;
}

/* Output Section */
.output-section {
    margin-bottom: 2rem;
}

.output-wrapper {
    position: relative;
}

.output-actions {
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 2;
}

.copy-button {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-base);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.copy-button:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.copy-button:active {
    transform: translateY(0);
}

.copy-button.success {
    background: var(--success-color) !important;
    color: white !important;
    border-color: var(--success-color) !important;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.encrypt-button,
.decrypt-button {
    flex: 1;
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.encrypt-button {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: white;
}

.decrypt-button {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
    color: white;
}

.encrypt-button:hover,
.decrypt-button:hover {
    transform: translateY(-2px);
}

.encrypt-button:hover {
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

.decrypt-button:hover {
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.3);
}

.encrypt-button:active,
.decrypt-button:active {
    transform: translateY(0);
}

/* Button disabled states */
.encrypt-button:disabled,
.decrypt-button:disabled,
.encrypt-button.disabled,
.decrypt-button.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.encrypt-button.loading,
.decrypt-button.loading {
    opacity: 0.8;
    cursor: wait;
}

/* Utility Buttons */
.utility-buttons {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
}

.clear-button {
    padding: 0.875rem 1.5rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.clear-button:hover {
    background: linear-gradient(135deg, var(--danger-color) 0%, #DC2626 100%);
    color: white;
    border-color: var(--danger-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.clear-button:active {
    transform: translateY(0);
}

/* Status Messages */
.status-message {
    padding: 1rem 1.5rem;
    border-radius: var(--radius-lg);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    animation: statusSlideIn 0.3s ease-out;
}

.status-message.success {
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
    color: white;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-message.error {
    background: linear-gradient(135deg, var(--danger-color) 0%, #DC2626 100%);
    color: white;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.status-message.info {
    background: linear-gradient(135deg, var(--primary-color) 0%, #2563EB 100%);
    color: white;
    border: 1px solid rgba(59, 130, 246, 0.3);
}

@keyframes statusSlideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Info Card */
.info-card {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    padding: 2rem;
    position: relative;
    overflow: hidden;
}

.info-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
    border-radius: 3px 3px 0 0;
}

.info-card h3 {
    margin: 0 0 1.5rem 0;
    color: var(--text-color);
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.info-card h3 i {
    color: var(--primary-color);
}

.info-content {
    display: grid;
    gap: 1.5rem;
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.info-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 50%;
    flex-shrink: 0;
}

.info-icon i {
    font-size: 1rem;
    color: white;
}

.info-text strong {
    display: block;
    color: var(--text-color);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.info-text p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Loading spinner animation */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.fa-spinner {
    animation: spin 1s linear infinite;
}

/* Responsive Design */
@media (max-width: 768px) {    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-content p {
        font-size: 1.125rem;
    }
    
    .calculator-card {
        padding: 1.5rem;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .privacy-notice {
        flex-direction: column;
        text-align: center;
    }
    
    .info-content {
        gap: 1rem;
    }
    
    .info-item {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .calculator-card {
        padding: 1rem;
    }
    
    .privacy-notice {
        padding: 1rem;
    }
}