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

:root {
    /* Cores oficiais do WhatsApp */
    --whatsapp-green: #25D366;
    --whatsapp-dark-green: #128C7E;
    --whatsapp-teal: #075E54;
    --whatsapp-light-green: #DCF8C6;
    --whatsapp-bg: #F0F2F5;
    --whatsapp-white: #FFFFFF;
    --whatsapp-text-dark: #1F2937;
    --whatsapp-text-medium: #667781;
    --whatsapp-text-light: #8696A0;
    --whatsapp-border: #E4E6EB;
    
    /* Sombras modernas */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, var(--whatsapp-teal) 0%, var(--whatsapp-dark-green) 50%, var(--whatsapp-green) 100%);
    background-attachment: fixed;
    color: var(--whatsapp-text-dark);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header Flutuante Moderno */
.floating-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(7, 94, 84, 0.98);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--whatsapp-white);
    padding: 16px 24px;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.floating-header.hidden {
    transform: translateY(-100%);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.header-title {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.header-title::before {
    content: '';
    width: 32px;
    height: 32px;
    background: var(--whatsapp-green);
    border-radius: 8px;
    display: inline-block;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M17.472 14.382c-.297-.149-1.758-.867-2.03-.967-.273-.099-.471-.148-.67.15-.197.297-.767.966-.94 1.164-.173.199-.347.223-.644.075-.297-.15-1.255-.463-2.39-1.475-.883-.788-1.48-1.761-1.653-2.059-.173-.297-.018-.458.13-.606.134-.133.298-.347.446-.52.149-.174.198-.298.298-.497.099-.198.05-.371-.025-.52-.075-.149-.669-1.612-.916-2.207-.242-.579-.487-.5-.669-.51-.173-.008-.371-.01-.57-.01-.198 0-.52.074-.792.372-.272.297-1.04 1.016-1.04 2.479 0 1.462 1.065 2.875 1.213 3.074.149.198 2.096 3.2 5.077 4.487.709.306 1.262.489 1.694.625.712.227 1.36.195 1.871.118.571-.085 1.758-.719 2.006-1.413.248-.694.248-1.289.173-1.413-.074-.124-.272-.198-.57-.347m-5.421 7.403h-.004a9.87 9.87 0 01-5.031-1.378l-.361-.214-3.741.982.998-3.648-.235-.374a9.86 9.86 0 01-1.51-5.26c.001-5.45 4.436-9.884 9.888-9.884 2.64 0 5.122 1.03 6.988 2.898a9.825 9.825 0 012.893 6.994c-.003 5.45-4.437 9.884-9.885 9.884m8.413-18.297A11.815 11.815 0 0012.05 0C5.495 0 .16 5.335.157 11.892c0 2.096.547 4.142 1.588 5.945L.057 24l6.305-1.654a11.882 11.882 0 005.683 1.448h.005c6.554 0 11.89-5.335 11.893-11.893a11.821 11.821 0 00-3.48-8.413Z'/%3E%3C/svg%3E");
    background-size: 20px;
    background-position: center;
    background-repeat: no-repeat;
}

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

.btn-download {
    background: var(--whatsapp-green);
    color: var(--whatsapp-white);
    padding: 12px 24px;
    border-radius: 24px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: var(--shadow-md);
}

.btn-download::before {
    content: '';
    width: 18px;
    height: 18px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm-2 15l-5-5 1.41-1.41L10 14.17l7.59-7.59L19 8l-9 9z'/%3E%3C/svg%3E");
    background-size: contain;
    display: inline-block;
}

.btn-download:hover {
    background: #20BA5A;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-close {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--whatsapp-white);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 300;
}

.btn-close svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
}

.btn-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

/* Hero Section Moderno */
.hero {
    padding: 140px 0 100px;
    text-align: center;
    color: var(--whatsapp-white);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(37, 211, 102, 0.3) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(18, 140, 126, 0.3) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 24px;
    letter-spacing: -1px;
    line-height: 1.1;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: 22px;
    margin-bottom: 48px;
    opacity: 0.95;
    font-weight: 400;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.search-box {
    max-width: 640px;
    margin: 0 auto;
}

.input-group {
    display: flex;
    gap: 0;
    background: var(--whatsapp-white);
    border-radius: 32px;
    padding: 6px;
    box-shadow: var(--shadow-xl);
    transition: all 0.3s ease;
}

.input-group:focus-within {
    box-shadow: 0 0 0 4px rgba(37, 211, 102, 0.2), var(--shadow-xl);
    transform: translateY(-2px);
}

.input-group input {
    flex: 1;
    border: none;
    padding: 16px 24px;
    font-size: 16px;
    border-radius: 32px;
    outline: none;
    color: var(--whatsapp-text-dark);
    font-weight: 400;
}

.input-group input::placeholder {
    color: var(--whatsapp-text-light);
}

.btn-search {
    background: var(--whatsapp-green);
    color: var(--whatsapp-white);
    border: none;
    padding: 16px 32px;
    border-radius: 32px;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
}

.btn-search:hover {
    background: #20BA5A;
    transform: scale(1.05);
}

.btn-search svg {
    width: 20px;
    height: 20px;
}

/* Features Section Moderno */
.features {
    padding: 100px 0;
    background: var(--whatsapp-white);
    position: relative;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.feature-card {
    text-align: center;
    padding: 40px 32px;
    border-radius: 20px;
    background: var(--whatsapp-bg);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--whatsapp-border);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--whatsapp-green), var(--whatsapp-dark-green));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--whatsapp-green);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--whatsapp-green), var(--whatsapp-dark-green));
    border-radius: 16px;
    color: var(--whatsapp-white);
    transition: all 0.3s ease;
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.feature-icon svg {
    width: 32px;
    height: 32px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
    color: var(--whatsapp-teal);
    font-weight: 600;
}

.feature-card p {
    color: var(--whatsapp-text-medium);
    font-size: 15px;
    line-height: 1.6;
}

/* How It Works */
.how-it-works {
    padding: 100px 0;
    background: var(--whatsapp-bg);
}

.section-title {
    text-align: center;
    font-size: 42px;
    margin-bottom: 64px;
    color: var(--whatsapp-text-dark);
    font-weight: 700;
    letter-spacing: -1px;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 40px;
}

.step {
    text-align: center;
    padding: 32px;
    position: relative;
}

.step-number {
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, var(--whatsapp-green), var(--whatsapp-dark-green));
    color: var(--whatsapp-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 700;
    margin: 0 auto 24px;
    box-shadow: var(--shadow-lg);
    position: relative;
}

.step-number::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--whatsapp-green);
    opacity: 0.3;
    transform: scale(1.5);
    animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
    0% {
        transform: scale(1.5);
        opacity: 0.3;
    }
    100% {
        transform: scale(2);
        opacity: 0;
    }
}

.step h3 {
    font-size: 22px;
    margin-bottom: 12px;
    color: var(--whatsapp-teal);
    font-weight: 600;
}

.step p {
    color: var(--whatsapp-text-medium);
    font-size: 15px;
    line-height: 1.6;
}

/* Search Page */
.search-page {
    max-width: 640px;
    margin: 120px auto 50px;
    background: var(--whatsapp-white);
    padding: 48px;
    border-radius: 24px;
    box-shadow: var(--shadow-xl);
}

.search-page h1 {
    text-align: center;
    margin-bottom: 32px;
    color: var(--whatsapp-teal);
    font-size: 32px;
    font-weight: 700;
}

.search-form {
    margin-bottom: 32px;
}

.alert {
    padding: 16px 20px;
    border-radius: 12px;
    margin-bottom: 24px;
    border-left: 4px solid;
}

.alert-error {
    background: #FEE2E2;
    color: #991B1B;
    border-left-color: #DC2626;
}

.loading-indicator {
    text-align: center;
    padding: 40px;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(240, 242, 245, 0.98);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    color: var(--whatsapp-text-dark);
    padding: 20px;
}

.loading-card {
    background: var(--whatsapp-white);
    border-radius: 24px;
    padding: 40px;
    max-width: 520px;
    width: 100%;
    box-shadow: var(--shadow-xl);
    text-align: center;
}

.loading-spinner-container {
    margin-bottom: 32px;
    display: flex;
    justify-content: center;
}

.loading-spinner-circle {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: #E5E7EB;
    position: relative;
    overflow: hidden;
}

.loading-spinner-fill {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: conic-gradient(from 0deg, var(--whatsapp-green) 0%, var(--whatsapp-green) 31%, #E5E7EB 31%, #E5E7EB 100%);
    animation: spin-fill 1.5s linear infinite;
    mask: radial-gradient(circle at center, transparent 60%, black 60%);
    -webkit-mask: radial-gradient(circle at center, transparent 60%, black 60%);
}

@keyframes spin-fill {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.loading-progress-bar {
    width: 100%;
    height: 8px;
    background: #E5E7EB;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 16px;
}

.loading-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--whatsapp-green), var(--whatsapp-dark-green));
    border-radius: 4px;
    width: 0%;
    transition: width 0.3s ease;
}

.loading-status-text {
    font-size: 16px;
    font-weight: 600;
    color: var(--whatsapp-text-dark);
    margin-bottom: 32px;
}

.loading-steps {
    background: #F3F4F6;
    border-radius: 16px;
    padding: 20px;
    text-align: left;
    margin-top: 8px;
}

.loading-step {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    transition: all 0.3s ease;
}

.loading-step:not(:last-child) {
    border-bottom: 1px solid #E5E7EB;
    margin-bottom: 0;
}

.loading-step.step-completed .step-text {
    color: var(--whatsapp-green);
    font-weight: 600;
}

.step-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.step-icon-loading {
    background: #E5E7EB;
    color: var(--whatsapp-text-medium);
    animation: pulse-icon 2s ease-in-out infinite;
}

.step-icon-success {
    background: var(--whatsapp-green);
    color: var(--whatsapp-white);
    animation: none;
}

@keyframes pulse-icon {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.7;
        transform: scale(0.95);
    }
}

.step-icon svg {
    width: 14px;
    height: 14px;
    stroke: currentColor;
    stroke-width: 2.5;
}

.step-text {
    color: var(--whatsapp-text-dark);
    font-size: 14px;
    transition: color 0.3s ease;
}

.loading-content {
    text-align: center;
}

.loading-content .spinner {
    border-color: rgba(255, 255, 255, 0.3);
    border-top-color: var(--whatsapp-white);
    margin-bottom: 24px;
}

.loading-text {
    font-size: 20px;
    font-weight: 600;
    color: var(--whatsapp-white);
    margin-top: 16px;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--whatsapp-bg);
    border-top-color: var(--whatsapp-green);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

.spinner-small {
    width: 20px;
    height: 20px;
    border: 2px solid var(--whatsapp-white);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: inline-block;
    vertical-align: middle;
    margin-right: 8px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--whatsapp-teal);
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 12px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.btn-back svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    transition: transform 0.3s ease;
}

.btn-back:hover {
    background: var(--whatsapp-bg);
    transform: translateX(-4px);
}

.btn-back:hover svg {
    transform: translateX(-4px);
}

/* Profile Page */
.profile-header {
    background: var(--whatsapp-white);
    padding: 48px;
    border-radius: 24px;
    box-shadow: var(--shadow-xl);
    margin: 120px auto 32px;
    max-width: 800px;
    display: flex;
    gap: 32px;
    align-items: center;
    border: 1px solid var(--whatsapp-border);
}

.profile-avatar {
    flex-shrink: 0;
}

.avatar-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--whatsapp-green), var(--whatsapp-dark-green));
    color: var(--whatsapp-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    font-weight: 700;
    box-shadow: var(--shadow-lg);
    border: 4px solid var(--whatsapp-white);
}

.profile-info h1 {
    font-size: 32px;
    margin-bottom: 8px;
    color: var(--whatsapp-text-dark);
    font-weight: 700;
}

.profile-number {
    font-size: 16px;
    color: var(--whatsapp-text-medium);
    margin-bottom: 12px;
    font-family: 'Courier New', monospace;
}

.profile-status {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    color: var(--whatsapp-green);
    font-weight: 600;
    font-size: 15px;
}

.status-indicator {
    width: 12px;
    height: 12px;
    background: var(--whatsapp-green);
    border-radius: 50%;
    display: inline-block;
    animation: pulse 2s infinite;
    box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7);
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(37, 211, 102, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(37, 211, 102, 0);
    }
}

.profile-last-seen {
    color: var(--whatsapp-text-light);
    font-size: 14px;
}

/* Unlock Section */
.unlock-section {
    text-align: center;
    margin: 40px auto;
    max-width: 800px;
}

.btn-unlock {
    background: linear-gradient(135deg, var(--whatsapp-green) 0%, var(--whatsapp-dark-green) 100%);
    color: var(--whatsapp-white);
    border: none;
    padding: 20px 48px;
    border-radius: 32px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.btn-unlock::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-unlock:hover::before {
    width: 300px;
    height: 300px;
}

.btn-unlock:hover:not(:disabled) {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(37, 211, 102, 0.4);
}

.btn-unlock:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-unlock.unlocked {
    background: linear-gradient(135deg, #10B981 0%, #059669 100%);
}

.unlock-icon {
    font-size: 24px;
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.unlock-icon svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
}

.btn-unlock span:not(.unlock-icon) {
    position: relative;
    z-index: 1;
}

/* Install Section */
.install-section {
    margin: 40px auto;
    max-width: 800px;
    animation: fadeInUp 0.5s ease;
}

.install-content {
    background: var(--whatsapp-white);
    padding: 32px;
    border-radius: 24px;
    box-shadow: var(--shadow-xl);
    text-align: center;
}

.btn-install {
    background: linear-gradient(135deg, var(--whatsapp-green) 0%, var(--whatsapp-dark-green) 100%);
    color: var(--whatsapp-white);
    border: none;
    padding: 18px 40px;
    border-radius: 32px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    margin-bottom: 32px;
}

.btn-install:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 40px rgba(37, 211, 102, 0.4);
    background: linear-gradient(135deg, #20BA5A 0%, #0F7A6E 100%);
}

.btn-install svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
}

.video-tutorial {
    margin-top: 24px;
}

.video-title {
    color: var(--whatsapp-teal);
    font-size: 22px;
    margin-bottom: 20px;
    font-weight: 600;
}

.video-wrapper {
    position: relative;
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: #000;
}

.tutorial-video {
    width: 100%;
    height: auto;
    display: block;
    max-height: 500px;
}

.video-description {
    margin-top: 16px;
    color: var(--whatsapp-text-medium);
    font-size: 14px;
}

/* Download App Section */
.download-app-section {
    background: var(--whatsapp-white);
    padding: 48px;
    border-radius: 24px;
    box-shadow: var(--shadow-xl);
    margin: 32px auto;
    max-width: 800px;
    border: 1px solid var(--whatsapp-border);
    text-align: center;
    animation: fadeInUp 0.5s ease;
}

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

.download-app-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.download-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--whatsapp-green), var(--whatsapp-dark-green));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--whatsapp-white);
    margin-bottom: 8px;
    box-shadow: var(--shadow-lg);
}

.download-app-content h3 {
    font-size: 28px;
    color: var(--whatsapp-teal);
    font-weight: 700;
    margin: 0;
}

.download-app-content p {
    font-size: 16px;
    color: var(--whatsapp-text-medium);
    margin: 0;
}

.btn-download-app {
    background: linear-gradient(135deg, var(--whatsapp-green) 0%, var(--whatsapp-dark-green) 100%);
    color: var(--whatsapp-white);
    padding: 16px 32px;
    border-radius: 24px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
    margin-top: 8px;
}

.btn-download-app:hover {
    background: linear-gradient(135deg, #20BA5A 0%, #0F7A6E 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-download-app svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin: 32px auto;
    max-width: 900px;
    align-items: stretch;
}

/* Conversations */
.conversations-section {
    background: var(--whatsapp-white);
    padding: 16px;
    border-radius: 20px;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--whatsapp-border);
    display: flex;
    flex-direction: column;
    height: 100%;
    max-height: 400px;
}

.conversations-section .section-title {
    font-size: 18px;
    margin-bottom: 12px;
    text-align: left;
    color: var(--whatsapp-teal);
    font-weight: 700;
}

.no-conversations {
    text-align: center;
    padding: 60px 40px;
    color: var(--whatsapp-text-medium);
}

.conversations-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
    justify-content: center;
    flex: 1;
    min-height: 0;
}

.conversations-list .conversation-image {
    max-width: 100%;
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.message-item {
    padding: 16px 20px;
    border-radius: 12px;
    background: var(--whatsapp-bg);
    border-left: 4px solid var(--whatsapp-green);
    transition: all 0.3s ease;
}

.message-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow);
}

.message-item.message-sent {
    background: var(--whatsapp-light-green);
    border-left-color: var(--whatsapp-dark-green);
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.message-sender {
    font-weight: 600;
    color: var(--whatsapp-teal);
    font-size: 14px;
}

.message-time {
    font-size: 12px;
    color: var(--whatsapp-text-light);
}

.message-content {
    color: var(--whatsapp-text-dark);
    line-height: 1.6;
    font-size: 15px;
}

/* Location Section */
.location-section {
    display: flex;
    align-items: stretch;
    height: 100%;
}

.location-card {
    width: 100%;
    background: var(--whatsapp-white);
    border-radius: 20px;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--whatsapp-border);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
    max-height: 400px;
}

.location-image-wrapper {
    position: relative;
    width: 100%;
    flex: 1;
    min-height: 0;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.location-image-blurred {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #4F5560 0%, #667781 50%, #8696A0 100%);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 400 400'%3E%3Cdefs%3E%3Cpattern id='grid' width='30' height='30' patternUnits='userSpaceOnUse'%3E%3Cpath d='M 30 0 L 0 0 0 30' fill='none' stroke='%23ffffff' stroke-width='0.3' opacity='0.2'/%3E%3C/pattern%3E%3ClinearGradient id='roadGrad' x1='0%25' y1='0%25' x2='100%25' y2='100%25'%3E%3Cstop offset='0%25' style='stop-color:%23E5E7EB;stop-opacity:0.3'/%3E%3Cstop offset='100%25' style='stop-color:%23D1D5DB;stop-opacity:0.2'/%3E%3C/linearGradient%3E%3C/defs%3E%3Crect width='100%25' height='100%25' fill='%234F5560'/%3E%3Crect width='100%25' height='100%25' fill='url(%23grid)'/%3E%3Cpath d='M 50 150 Q 100 100 150 150 T 250 150 T 350 150' stroke='url(%23roadGrad)' stroke-width='8' fill='none'/%3E%3Cpath d='M 150 50 Q 150 100 150 150 T 150 250 T 150 350' stroke='url(%23roadGrad)' stroke-width='8' fill='none'/%3E%3Ccircle cx='200' cy='200' r='60' fill='%2325D366' opacity='0.15'/%3E%3Ccircle cx='200' cy='200' r='40' fill='%2325D366' opacity='0.25'/%3E%3C/svg%3E");
    background-size: cover;
    background-position: center;
    filter: blur(12px) brightness(0.8);
    -webkit-filter: blur(12px) brightness(0.8);
    transition: filter 0.8s ease;
}

.location-image-unlocked {
    filter: blur(0px);
    -webkit-filter: blur(0px);
}

.location-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 1;
}

.location-pin {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(37, 211, 102, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--whatsapp-white);
    z-index: 2;
    box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4);
    animation: pulse-pin 2s ease-in-out infinite;
}

.location-pin svg {
    width: 32px;
    height: 32px;
    stroke: currentColor;
    fill: currentColor;
}

@keyframes pulse-pin {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
        box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4);
    }
    50% {
        transform: translate(-50%, -50%) scale(1.1);
        box-shadow: 0 6px 20px rgba(37, 211, 102, 0.6);
    }
}

.btn-unlock-location {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(135deg, var(--whatsapp-green) 0%, var(--whatsapp-dark-green) 100%);
    color: var(--whatsapp-white);
    border: none;
    padding: 16px 32px;
    border-radius: 24px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-xl);
    z-index: 3;
    white-space: nowrap;
}

.btn-unlock-location:hover:not(:disabled) {
    transform: translate(-50%, -50%) translateY(-2px);
    box-shadow: 0 20px 40px rgba(37, 211, 102, 0.4);
    background: linear-gradient(135deg, #20BA5A 0%, #0F7A6E 100%);
}

.btn-unlock-location:disabled {
    opacity: 0.8;
    cursor: not-allowed;
}

.btn-unlock-location svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
}

.actions {
    text-align: center;
    margin: 40px 0;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .header-content {
        flex-wrap: wrap;
    }
    
    .btn-download {
        font-size: 13px;
        padding: 10px 20px;
    }
    
    .profile-header {
        flex-direction: column;
        text-align: center;
        padding: 32px 24px;
    }
    
    .input-group {
        flex-direction: column;
        border-radius: 16px;
        padding: 4px;
    }
    
    .input-group input,
    .btn-search {
        border-radius: 16px;
        width: 100%;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .conversations-section {
        padding: 32px 24px;
    }
    
    .btn-unlock-location {
        padding: 14px 24px;
        font-size: 14px;
        white-space: normal;
        text-align: center;
        max-width: 90%;
    }
    
    .btn-unlock-location span {
        display: block;
    }
    
    .install-content {
        padding: 24px;
    }
    
    .btn-install {
        padding: 16px 32px;
        font-size: 16px;
        width: 100%;
        justify-content: center;
    }
    
    .video-title {
        font-size: 18px;
    }
    
    .tutorial-video {
        max-height: 300px;
    }
    
    .video-description {
        font-size: 13px;
    }
}