@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    /* Apple-inspired color palette */
    --apple-bg: #ffffff;
    --apple-text: #1d1d1f;
    --apple-text-secondary: #86868b;
    --apple-primary: #0071e3;
    --apple-primary-hover: #0077ed;
    --apple-gray-100: #f5f5f7;
    --apple-gray-200: #e5e5e7;
    --apple-gray-300: #d2d2d7;
    --apple-gray-400: #86868b;
    --apple-gray-500: #6e6e73;
    --apple-gray-600: #1d1d1f;
    
    /* Typography */
    --apple-font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --apple-font-mono: "SF Mono", "Menlo", "Monaco", "Courier New", monospace;
    
    /* Spacing */
    --apple-spacing-xs: 0.5rem;
    --apple-spacing-sm: 1rem;
    --apple-spacing-md: 2rem;
    --apple-spacing-lg: 4rem;
    --apple-spacing-xl: 8rem;
    
    /* Transitions */
    --apple-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--apple-font);
    color: var(--apple-text);
    background: var(--apple-bg);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    padding: var(--apple-spacing-sm) 0;
    border-bottom: 1px solid var(--apple-gray-200);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--apple-spacing-xs);
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text h1 {
    font-size: 1.5rem;
    margin-bottom: 0;
}

.tagline {
    font-size: 0.875rem;
    color: var(--apple-text-secondary);
}

.nav-links {
    display: flex;
    gap: var(--apple-spacing-md);
    list-style: none;
}

.nav-links a {
    color: var(--apple-text);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--apple-transition);
}

.nav-links a:hover {
    color: var(--apple-primary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--apple-spacing-sm);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--apple-spacing-sm);
}

h1 {
    font-size: 3.5rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.5rem;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.75rem;
}

p {
    color: var(--apple-text-secondary);
    margin-bottom: var(--apple-spacing-sm);
}

.hero {
    padding: var(--apple-spacing-xl) 0;
    margin-top: 80px;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h2 {
    margin-bottom: var(--apple-spacing-md);
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: var(--apple-spacing-md);
}

.btn-download {
    background: var(--apple-primary);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--apple-transition);
}

.btn-download:hover {
    background: var(--apple-primary-hover);
}

.features {
    padding: var(--apple-spacing-xl) 0;
    background: var(--apple-gray-100);
}

.section-title {
    text-align: center;
    margin-bottom: var(--apple-spacing-lg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--apple-spacing-md);
}

.feature-card {
    background: var(--apple-bg);
    padding: var(--apple-spacing-md);
    border-radius: 20px;
    transition: var(--apple-transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: var(--apple-spacing-sm);
}

.encryption-visualization {
    padding: var(--apple-spacing-xl) 0;
    background: var(--apple-gray-100);
}

.visual-block {
    background: var(--apple-bg);
    border-radius: 20px;
    padding: var(--apple-spacing-lg);
    margin-bottom: var(--apple-spacing-lg);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.visual-block h3 {
    margin-bottom: var(--apple-spacing-md);
}

.how-it-works {
    padding: var(--apple-spacing-xl) 0;
    background: var(--apple-gray-100);
}

.workflow {
    display: grid;
    gap: var(--apple-spacing-lg);
}

.step {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: var(--apple-spacing-md);
    align-items: start;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--apple-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 600;
}

.faq {
    padding: var(--apple-spacing-xl) 0;
}

.faq-item {
    margin-bottom: var(--apple-spacing-md);
    padding: var(--apple-spacing-md);
    background: var(--apple-gray-100);
    border-radius: 20px;
}

.faq-question {
    color: var(--apple-text);
    margin-bottom: var(--apple-spacing-xs);
}

.faq-answer {
    color: var(--apple-text-secondary);
}

footer {
    padding: var(--apple-spacing-lg) 0;
    background: var(--apple-gray-100);
    text-align: center;
}

#back-to-top {
    position: fixed;
    bottom: var(--apple-spacing-md);
    right: var(--apple-spacing-md);
    width: 50px;
    height: 50px;
    background: var(--apple-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 1.5rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--apple-transition);
    z-index: 1000;
}

#back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

#back-to-top:hover {
    background: var(--apple-primary-hover);
    transform: translateY(-3px);
}

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .hero {
        padding: var(--apple-spacing-lg) 0;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .step {
        grid-template-columns: 1fr;
    }
    
    .step-number {
        margin-bottom: var(--apple-spacing-sm);
    }
}

.terminal-window {
    background: #1e1e1e;
    border-radius: 10px;
    overflow: hidden;
    margin-top: var(--apple-spacing-md);
}

.terminal-header {
    background: #2d2d2d;
    padding: 0.5rem 1rem;
    display: flex;
    gap: 0.5rem;
}

.terminal-button {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #ff5f56;
}

.terminal-button:nth-child(2) {
    background: #ffbd2e;
}

.terminal-button:nth-child(3) {
    background: #27c93f;
}

.terminal-content {
    padding: 1rem;
    font-family: var(--apple-font-mono);
    color: #f8f8f2;
    font-size: 0.875rem;
    line-height: 1.5;
}

code {
    font-family: var(--apple-font-mono);
    background: var(--apple-gray-100);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.875rem;
}

.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip-text {
    visibility: hidden;
    position: absolute;
    background: var(--apple-gray-600);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.75rem;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: var(--apple-transition);
    white-space: nowrap;
}

.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

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

.feature-card, .visual-block, .faq-item {
    animation: fadeIn 0.6s ease-out forwards;
}

/* Vault Structure */
.vault-structure {
    display: flex;
    flex-direction: column;
    gap: var(--apple-spacing-lg);
}

.master-password {
    display: flex;
    align-items: center;
    gap: var(--apple-spacing-sm);
    padding: var(--apple-spacing-md);
    background: var(--apple-gray-100);
    border-radius: 12px;
    margin-bottom: var(--apple-spacing-lg);
}

.key-icon {
    font-size: 1.5rem;
}

.key-label {
    font-weight: 600;
    color: var(--apple-text);
}

.key-description {
    color: var(--apple-text-secondary);
    font-size: 0.875rem;
}

.vaults-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--apple-spacing-lg);
}

.vault {
    background: var(--apple-gray-100);
    border-radius: 16px;
    padding: var(--apple-spacing-md);
    border: 1px solid var(--apple-gray-200);
}

.vault-header {
    display: flex;
    align-items: center;
    gap: var(--apple-spacing-xs);
    margin-bottom: var(--apple-spacing-md);
}

.vault-icon {
    font-size: 1.25rem;
}

.vault-name {
    font-weight: 600;
    color: var(--apple-text);
}

.vault-key {
    background: var(--apple-bg);
    padding: var(--apple-spacing-sm);
    border-radius: 8px;
    margin-bottom: var(--apple-spacing-md);
}

.encrypted-key {
    display: flex;
    align-items: center;
    gap: var(--apple-spacing-xs);
    font-family: var(--apple-font-mono);
    font-size: 0.875rem;
    color: var(--apple-text-secondary);
}

.records {
    display: flex;
    flex-direction: column;
    gap: var(--apple-spacing-sm);
}

.record {
    background: var(--apple-bg);
    border-radius: 8px;
    padding: var(--apple-spacing-sm);
    border: 1px solid var(--apple-gray-200);
}

.record-header {
    font-weight: 500;
    margin-bottom: var(--apple-spacing-xs);
}

.record-fields {
    display: flex;
    flex-direction: column;
    gap: var(--apple-spacing-xs);
}

.field {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
}

.field-name {
    color: var(--apple-text-secondary);
}

.field-value.encrypted {
    color: var(--apple-text-secondary);
    font-family: var(--apple-font-mono);
}

/* Encryption Process */
.encryption-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--apple-spacing-md);
    margin: var(--apple-spacing-lg) 0;
}

.flow-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--apple-spacing-sm);
    text-align: center;
    max-width: 200px;
}

.step-number {
    width: 40px;
    height: 40px;
    background: var(--apple-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.step-icon {
    font-size: 1.5rem;
}

.flow-arrow {
    font-size: 1.5rem;
    color: var(--apple-text-secondary);
}

/* Security Model */
.security-model {
    margin-top: var(--apple-spacing-lg);
}

.trust-boundary {
    display: flex;
    gap: var(--apple-spacing-lg);
    margin: var(--apple-spacing-lg) 0;
}

.trust-zone {
    flex: 1;
    background: var(--apple-gray-100);
    border-radius: 16px;
    padding: var(--apple-spacing-md);
}

.zone-title {
    font-weight: 600;
    margin-bottom: var(--apple-spacing-md);
    color: var(--apple-text);
}

.zone-content {
    display: flex;
    flex-direction: column;
    gap: var(--apple-spacing-sm);
}

.trust-item {
    display: flex;
    align-items: center;
    gap: var(--apple-spacing-xs);
    padding: var(--apple-spacing-sm);
    background: var(--apple-bg);
    border-radius: 8px;
}

.item-icon {
    font-size: 1.25rem;
}

.item-text {
    font-size: 0.875rem;
    color: var(--apple-text);
}

/* Responsive Design */
@media (max-width: 768px) {
    .vaults-container {
        grid-template-columns: 1fr;
    }
    
    .encryption-flow {
        flex-direction: column;
    }
    
    .trust-boundary {
        flex-direction: column;
    }
}