/* ===================================
   SILENT SENDER - MODERN BLUE DESIGN SYSTEM
   =================================== */

/* CSS Variables */
:root {
    /* New Blue Color Palette */
    --navy-dark: #050A30;
    --navy: #12229D;
    --blue-primary: #233DFF;
    --blue-light: #5CB6F9;
    --blue-pale: #CAE8FF;
    --white-tint: #F4F6FC;
    
    /* Base Colors */
    --white: #FFFFFF;
    --black: #0A0F2C;
    --text-primary: #050A30;
    --text-secondary: #4A5568;
    --text-light: #718096;
    
    /* Status Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #233DFF 0%, #5CB6F9 100%);
    --gradient-dark: linear-gradient(135deg, #050A30 0%, #12229D 100%);
    --gradient-light: linear-gradient(135deg, #5CB6F9 0%, #CAE8FF 100%);
    
    /* Primary & Accent */
    --primary: #233DFF;
    --primary-dark: #12229D;
    --primary-light: #5CB6F9;
    --secondary: #050A30;
    --accent: #5CB6F9;
    --accent-light: #CAE8FF;
    
    /* Neutrals */
    --off-white: #F4F6FC;
    --light-gray: #E8EBF5;
    --gray: #D1D5E0;
    --medium-gray: #718096;
    --dark-gray: #4A5568;
    
    /* Typography */
    --font-display: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
    
    /* Spacing */
    --section-padding: 120px;
    --container-padding: 80px;
    
    /* Effects */
    --shadow-sm: 0 2px 8px rgba(35, 61, 255, 0.08);
    --shadow-md: 0 4px 16px rgba(35, 61, 255, 0.12);
    --shadow-lg: 0 8px 32px rgba(35, 61, 255, 0.16);
    --shadow-xl: 0 16px 48px rgba(35, 61, 255, 0.20);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--text-primary);
    line-height: 1.7;
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===================================
   NAVIGATION
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--light-gray);
    z-index: 1000;
    transition: var(--transition);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
}

.logo img {
    height: 70px;
    width: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 40px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
    transition: var(--transition);
}

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

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    background: transparent;
    border: none;
    padding: 8px;
    z-index: 1001;
}

.mobile-menu-toggle span {
    width: 28px;
    height: 3px;
    background: var(--navy-dark);
    border-radius: 2px;
    transition: all 0.3s ease;
    display: block;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ===================================
   BUTTONS
   =================================== */

.btn-primary,
.btn-secondary,
.btn-outline,
.btn-white {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 15px;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
    text-align: center;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--gray);
}

.btn-secondary:hover {
    background: var(--off-white);
    border-color: var(--primary);
    color: var(--primary);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
}

.btn-white {
    background: var(--white);
    color: var(--primary);
    box-shadow: var(--shadow-lg);
}

.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-large {
    padding: 18px 48px;
    font-size: 17px;
    border-radius: 14px;
}

/* ===================================
   HERO SECTION
   =================================== */

.hero {
    padding: 180px 0 120px;
    background: var(--gradient-dark);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(35, 61, 255, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(92, 182, 249, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.02) 0px, transparent 1px, transparent 80px),
        repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.02) 0px, transparent 1px, transparent 80px);
    pointer-events: none;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        linear-gradient(45deg, transparent 45%, rgba(35, 61, 255, 0.05) 50%, transparent 55%),
        linear-gradient(-45deg, transparent 45%, rgba(92, 182, 249, 0.05) 50%, transparent 55%);
    background-size: 60px 60px;
    animation: backgroundMove 20s linear infinite;
    opacity: 0.5;
}

@keyframes backgroundMove {
    0% { background-position: 0 0, 0 0; }
    100% { background-position: 60px 60px, -60px 60px; }
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: 64px;
    font-weight: 700;
    line-height: 1.1;
    color: var(--white);
    margin-bottom: 24px;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.gradient-text {
    background: linear-gradient(135deg, #5CB6F9 0%, #CAE8FF 50%, #FFFFFF 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
    line-height: 1.6;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-visual {
    position: relative;
    height: 500px;
}

.floating-card {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 24px 32px;
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    gap: 16px;
    animation: float 3s ease-in-out infinite;
}

.floating-card .card-icon {
    font-size: 32px;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.floating-card p {
    font-weight: 600;
    color: var(--white);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.card-1 {
    top: 50px;
    left: 50px;
    animation-delay: 0s;
}

.card-2 {
    top: 200px;
    right: 80px;
    animation-delay: 1s;
}

.card-3 {
    bottom: 80px;
    left: 100px;
    animation-delay: 2s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* ===================================
   SECTION HEADERS
   =================================== */

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 80px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 48px;
    font-weight: 700;
    color: var(--navy-dark);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===================================
   FEATURES SECTION
   =================================== */

.features {
    padding: var(--section-padding) 0;
    background: var(--white-tint);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.feature-card {
    background: var(--white);
    padding: 48px 40px;
    border-radius: 24px;
    transition: var(--transition);
    position: relative;
    border: 2px solid transparent;
    box-shadow: var(--shadow-sm);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--blue-light);
}

.feature-number {
    position: absolute;
    top: 24px;
    right: 24px;
    font-family: var(--font-display);
    font-size: 64px;
    font-weight: 700;
    color: var(--blue-pale);
    opacity: 0.4;
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.feature-card h3 {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 600;
    color: var(--navy-dark);
    margin-bottom: 16px;
}

.feature-card p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===================================
   BENEFITS SECTION
   =================================== */

.benefits {
    padding: var(--section-padding) 0;
    background: var(--white);
}

.benefits-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.benefit-list {
    display: flex;
    flex-direction: column;
    gap: 32px;
    margin-top: 40px;
}

.benefit-item {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    padding: 24px;
    background: var(--off-white);
    border-radius: 16px;
    transition: var(--transition);
}

.benefit-item:hover {
    background: var(--white);
    box-shadow: var(--shadow-md);
    transform: translateX(8px);
}

.benefit-icon {
    font-size: 32px;
    flex-shrink: 0;
}

.benefit-item h4 {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 600;
    color: var(--navy-dark);
    margin-bottom: 8px;
}

.benefit-item p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Browser Mockup */
.mockup-browser {
    background: var(--white);
    border-radius: 20px;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--light-gray);
}

.browser-header {
    background: var(--off-white);
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    border-bottom: 1px solid var(--light-gray);
}

.browser-dots {
    display: flex;
    gap: 8px;
}

.browser-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.browser-dots span:nth-child(1) {
    background: #FF5F56;
}

.browser-dots span:nth-child(2) {
    background: #FFBD2E;
}

.browser-dots span:nth-child(3) {
    background: #27C93F;
}

.browser-url {
    background: var(--white);
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 13px;
    color: var(--text-light);
    flex: 1;
    border: 1px solid var(--light-gray);
}

.browser-content {
    padding: 40px;
    background: var(--white-tint);
    min-height: 400px;
}

.profile-preview {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.profile-header-mini {
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
}

.profile-items {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.profile-item-mini {
    height: 120px;
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--light-gray);
}

/* ===================================
   CTA SECTION
   =================================== */

.cta-section {
    padding: 100px 0;
    background: var(--gradient-primary);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.cta-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta-content h2 {
    font-family: var(--font-display);
    font-size: 48px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 40px;
}

/* ===================================
   FOOTER
   =================================== */

.footer {
    background: var(--navy-dark);
    color: var(--white);
    padding: 80px 0 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    padding-bottom: 30px;
    margin-bottom: 0;
    border-bottom: none;
}

.footer-logo img {
    height: 66px;
    margin-bottom: 20px;
    filter: brightness(0) invert(1);
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
    max-width: 300px;
    font-size: 15px;
}

.footer-section h4 {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 600;
    color: var(--blue-light);
    margin-bottom: 20px;
}

.footer-section ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 15px;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--white);
    padding-left: 8px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 32px;
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

/* ===================================
   CONTENT SECTION PADDING FIX
   =================================== */

.policy-section,
.profile-section,
.dashboard-section,
.register-section {
    padding-top: 160px !important;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

@media (max-width: 1024px) {
    :root {
        --section-padding: 80px;
    }
    
    .hero .container {
        grid-template-columns: 1fr;
        gap: 60px;
    }
    
    .hero-visual {
        height: 400px;
    }
    
    .hero-title {
        font-size: 52px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .benefits-content {
        grid-template-columns: 1fr;
        gap: 60px;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    /* MOBILE NAVIGATION */
    .nav-content {
        padding: 15px 0;
    }
    
    .logo img {
        height: 60px;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 90px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 24px;
        box-shadow: 0 8px 16px rgba(35, 61, 255, 0.1);
        gap: 0;
        transform: translateX(100%);
        transition: transform 0.3s ease;
        max-height: calc(100vh - 90px);
        overflow-y: auto;
        border-top: 1px solid var(--light-gray);
    }
    
    .nav-links.active {
        transform: translateX(0);
    }
    
    .nav-links li {
        width: 100%;
        margin: 0;
        padding: 0;
        border-bottom: 1px solid var(--off-white);
    }
    
    .nav-links li:last-child {
        border-bottom: none;
    }
    
    .nav-links a {
        display: block;
        padding: 16px 0;
        font-size: 16px;
        width: 100%;
    }
    
    .nav-links .btn-secondary,
    .nav-links .btn-primary {
        display: block;
        text-align: center;
        margin-top: 8px;
        width: 100%;
    }
    
    /* CONTENT PADDING */
    .policy-section,
    .profile-section,
    .dashboard-section,
    .register-section {
        padding-top: 110px !important;
    }
    
    /* HERO */
    .hero {
        padding: 140px 0 80px;
    }
    
    .hero-title {
        font-size: 40px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-cta .btn-large {
        width: 100%;
    }
    
    .hero-visual {
        display: none;
    }
    
    /* SECTIONS */
    .section-title {
        font-size: 36px;
    }
    
    .section-subtitle {
        font-size: 16px;
    }
    
    .profile-items {
        grid-template-columns: 1fr;
    }
    
    .benefits-content {
        grid-template-columns: 1fr;
    }
    
    .cta-content h2 {
        font-size: 36px;
    }
    
    .cta-content p {
        font-size: 18px;
    }
    
    /* FOOTER */
    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .btn-large {
        padding: 14px 32px;
        font-size: 15px;
    }
    
    .policy-section,
    .profile-section,
    .dashboard-section,
    .register-section {
        padding-top: 110px !important;
    }
}

/* ===================================
   FORM ELEMENTS
   =================================== */

.checkbox-group {
    margin: 15px 0;
}

.checkbox-label {
    width: 100%;
    padding: 5px 0;
    align-items: center;
    display: flex;
    gap: 12px;
    cursor: pointer;
}

.checkbox-custom {
    width: 24px;
    height: 24px;
    border: 2px solid var(--gray);
    border-radius: 8px;
    flex-shrink: 0;
    position: relative;
    transition: var(--transition);
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom {
    background: var(--primary);
    border-color: var(--primary);
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 16px;
    font-weight: 700;
    color: var(--white);
}

.checkbox-text {
    font-size: 15px;
    line-height: 1.5;
    flex: 1;
    color: var(--text-primary);
}