/* ========================================
   CSS Variables - Military Tactical Theme
   ======================================== */
:root {
    /* Colors - Gunmetal Gray & Electric Blue */
    --color-primary: #1a73e8;
    --color-primary-dark: #0d47a1;
    --color-primary-light: #4dabf7;
    --color-secondary: #37474f;
    --color-accent: #00e5ff;
    
    --color-bg-dark: #0a0e1a;
    --color-bg-medium: #1a1f2e;
    --color-bg-light: #2a3142;
    --color-surface: #1e2433;
    
    --color-text-primary: #ffffff;
    --color-text-secondary: #b0bec5;
    --color-text-muted: #78909c;
    
    --color-google-play: #34a853;
    --color-app-store-disabled: #2a2a2a;
    
    /* Typography - Bold Condensed Sans */
    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-heading: "Arial Narrow", "Helvetica Neue Condensed", "Roboto Condensed", sans-serif;
    
    --font-size-base: 16px;
    --font-size-small: 14px;
    --font-size-large: 18px;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;
    --font-weight-heavy: 900;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    
    /* Layout */
    --container-max-width: 1200px;
    --header-height-mobile: 56px;
    --header-height-desktop: 72px;
    --sticky-cta-height: 64px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-medium: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* ========================================
   Reset & Base Styles
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-dark);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent);
}

a:active {
    color: var(--color-primary);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

button:disabled {
    cursor: not-allowed;
}

/* ========================================
   Sticky Header
   ======================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height-mobile);
    background-color: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    transition: transform var(--transition-medium);
}

.header-container {
    max-width: var(--container-max-width);
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
}

.header-title {
    font-family: var(--font-family-heading);
    font-size: 18px;
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.5px;
}

.header-nav {
    display: none;
}

.header-cta-mobile {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary-light);
    transition: color var(--transition-fast);
}

.header-cta-mobile:hover,
.header-cta-mobile:active {
    color: var(--color-accent);
}

/* Desktop Header */
@media (min-width: 768px) {
    .site-header {
        height: var(--header-height-desktop);
    }
    
    .header-container {
        padding: 0 var(--spacing-md);
    }
    
    .header-icon {
        width: 48px;
        height: 48px;
    }
    
    .header-title {
        font-size: 20px;
    }
    
    .header-nav {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
    }
    
    .nav-link {
        font-size: var(--font-size-small);
        font-weight: var(--font-weight-medium);
        color: var(--color-text-secondary);
        text-transform: uppercase;
        letter-spacing: 0.5px;
        padding: 8px 12px;
        transition: color var(--transition-fast);
    }
    
    .nav-link:hover {
        color: var(--color-text-primary);
    }
    
    .nav-cta {
        padding: 10px 24px;
        background-color: var(--color-primary);
        color: var(--color-text-primary);
        font-weight: var(--font-weight-bold);
        text-transform: uppercase;
        letter-spacing: 0.5px;
        border-radius: var(--radius-sm);
        transition: background-color var(--transition-fast), transform var(--transition-fast);
    }
    
    .nav-cta:hover {
        background-color: var(--color-primary-light);
        transform: translateY(-1px);
    }
    
    .nav-cta:active {
        background-color: var(--color-primary-dark);
        transform: translateY(0);
    }
    
    .header-cta-mobile {
        display: none;
    }
}

/* ========================================
   Hero Section - Diagonal Split Layout
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    padding-top: calc(var(--header-height-mobile) + var(--spacing-md));
    padding-bottom: var(--spacing-2xl);
    background: linear-gradient(180deg, var(--color-bg-dark) 0%, var(--color-bg-medium) 100%);
    overflow: hidden;
}

.hero-diagonal-bg {
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, transparent 40%, var(--color-primary-dark) 40%, var(--color-primary) 60%, transparent 60%);
    opacity: 0.1;
    pointer-events: none;
}

.hero-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.hero-content {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.hero-icon {
    width: 96px;
    height: 96px;
    margin: 0 auto var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.hero-title {
    font-family: var(--font-family-heading);
    font-size: 32px;
    font-weight: var(--font-weight-heavy);
    line-height: 1.2;
    letter-spacing: -1px;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
}

.hero-subtitle {
    font-size: var(--font-size-large);
    line-height: 1.5;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
}

.hero-visual {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.hero-banner {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Desktop Hero */
@media (min-width: 768px) {
    .hero {
        padding-top: calc(var(--header-height-desktop) + var(--spacing-xl));
    }
    
    .hero-container {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-xl);
        align-items: center;
        padding: 0 var(--spacing-md);
    }
    
    .hero-content {
        text-align: left;
        margin-bottom: 0;
    }
    
    .hero-icon {
        margin: 0 0 var(--spacing-md) 0;
    }
    
    .hero-title {
        font-size: 48px;
    }
    
    .hero-subtitle {
        font-size: 20px;
        margin: 0 0 var(--spacing-xl) 0;
    }
    
    .hero-buttons {
        flex-direction: row;
        justify-content: flex-start;
    }
}

@media (min-width: 1024px) {
    .hero-title {
        font-size: 56px;
    }
}

/* ========================================
   Download Buttons - Tactical Block Style
   ======================================== */
.download-button {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 24px;
    min-width: 200px;
    min-height: 60px;
    border-radius: var(--radius-sm);
    font-family: var(--font-family-base);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.download-button.google-play {
    background-color: var(--color-google-play);
    color: var(--color-text-primary);
}

.download-button.google-play:hover {
    background-color: #2e8b47;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.download-button.google-play:active {
    background-color: #267a3c;
    transform: translateY(0);
}

.download-button.app-store-disabled {
    position: relative;
    background-color: var(--color-app-store-disabled);
    color: var(--color-text-muted);
    opacity: 0.55;
    filter: grayscale(0.6);
    cursor: not-allowed;
}

.button-icon {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}

.button-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.3;
}

.button-label {
    font-size: 11px;
    font-weight: var(--font-weight-normal);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.button-store {
    font-size: 18px;
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.5px;
}

.coming-soon-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background-color: var(--color-secondary);
    color: var(--color-text-secondary);
    font-size: 10px;
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}

/* ========================================
   Features Section
   ======================================== */
.features {
    padding: var(--spacing-2xl) var(--spacing-sm);
    background-color: var(--color-bg-medium);
}

.features-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.section-title {
    font-family: var(--font-family-heading);
    font-size: 32px;
    font-weight: var(--font-weight-heavy);
    text-align: center;
    text-transform: uppercase;
    letter-spacing: -0.5px;
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: var(--font-size-large);
    text-align: center;
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.feature-card {
    background-color: var(--color-surface);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform var(--transition-medium), border-color var(--transition-medium);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary);
}

.feature-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary-light);
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-title {
    font-family: var(--font-family-heading);
    font-size: 20px;
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: -0.5px;
    margin-bottom: var(--spacing-xs);
}

.feature-description {
    font-size: var(--font-size-small);
    line-height: 1.6;
    color: var(--color-text-secondary);
}

/* Desktop Features */
@media (min-width: 768px) {
    .features {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }
    
    .section-title {
        font-size: 40px;
    }
}

@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .section-title {
        font-size: 48px;
    }
}

/* ========================================
   Download CTA Section
   ======================================== */
.download-cta {
    padding: var(--spacing-2xl) var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-accent) 100%);
    position: relative;
    overflow: hidden;
}

.download-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml;utf8,<svg width="60" height="60" xmlns="http://www.w3.org/2000/svg"><rect width="1" height="1" fill="white" opacity="0.1"/></svg>') repeat;
    opacity: 0.2;
}

.download-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.download-title {
    font-family: var(--font-family-heading);
    font-size: 36px;
    font-weight: var(--font-weight-heavy);
    text-transform: uppercase;
    letter-spacing: -1px;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.download-subtitle {
    font-size: var(--font-size-large);
    margin-bottom: var(--spacing-xl);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
}

/* Desktop Download CTA */
@media (min-width: 768px) {
    .download-cta {
        padding: 80px var(--spacing-md);
    }
    
    .download-title {
        font-size: 48px;
    }
    
    .download-subtitle {
        font-size: 22px;
    }
    
    .download-buttons {
        flex-direction: row;
        justify-content: center;
        gap: var(--spacing-md);
    }
}

@media (min-width: 1024px) {
    .download-title {
        font-size: 56px;
    }
}

/* ========================================
   About Section
   ======================================== */
.about {
    padding: var(--spacing-2xl) var(--spacing-sm);
    background-color: var(--color-bg-dark);
}

.about-container {
    max-width: 800px;
    margin: 0 auto;
}

.about-content {
    margin-top: var(--spacing-lg);
}

.about-content p {
    font-size: var(--font-size-base);
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.about-contact {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Desktop About */
@media (min-width: 768px) {
    .about {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    .about-content p {
        font-size: var(--font-size-large);
    }
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
    padding: var(--spacing-xl) var(--spacing-sm) 120px;
    background-color: var(--color-bg-medium);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: var(--spacing-md);
}

.footer-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
}

.footer-title {
    font-family: var(--font-family-heading);
    font-size: 18px;
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: -0.5px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.footer-links a {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: var(--font-weight-medium);
}

.footer-contact {
    margin-bottom: var(--spacing-md);
}

.footer-contact p {
    font-size: var(--font-size-small);
    color: var(--color-text-muted);
}

.footer-copyright {
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-copyright p {
    font-size: var(--font-size-small);
    color: var(--color-text-muted);
}

/* Desktop Footer */
@media (min-width: 768px) {
    .site-footer {
        padding: var(--spacing-xl) var(--spacing-md) var(--spacing-xl);
    }
}

/* ========================================
   Mobile Sticky CTA
   ======================================== */
.mobile-sticky-cta {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 12px var(--spacing-sm);
    background-color: rgba(10, 14, 26, 0.98);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 999;
    transform: translateY(100%);
    transition: transform var(--transition-medium);
}

.mobile-sticky-cta.visible {
    transform: translateY(0);
}

.sticky-cta-button {
    display: block;
    width: 100%;
    padding: 16px;
    background-color: var(--color-primary);
    color: var(--color-text-primary);
    font-size: var(--font-size-large);
    font-weight: var(--font-weight-bold);
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.sticky-cta-button:active {
    background-color: var(--color-primary-dark);
    transform: scale(0.98);
}

/* Hide on desktop */
@media (min-width: 768px) {
    .mobile-sticky-cta {
        display: none;
    }
}