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

:root {
    --primary-color: #4A90E2;
    --secondary-color: #357ABD;
    --success-color: #27AE60;
    --warning-color: #F39C12;
    --danger-color: #E74C3C;
    --text-dark: #2C3E50;
    --text-light: #7F8C8D;
    --bg-light: #F8F9FA;
    --border-color: #E0E0E0;
    --white: #FFFFFF;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding-top: 60px;
    color: var(--text-dark);
}

/* Banner */
.banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, #25D366 0%, #128C7E 100%);
    padding: 12px 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
}

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

.banner-content span {
    color: var(--white);
    font-weight: 600;
    font-size: 16px;
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.whatsapp-btn {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    text-decoration: none;
}

.whatsapp-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

/* Container */
.container {
    max-width: 1000px;
    margin: 20px auto;
    padding: 0 20px 40px;
}

/* Page */
.page {
    display: none;
    background: var(--white);
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

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

/* Titles */
.main-title {
    text-align: center;
    color: #4A90E2;
    font-size: 32px;
    margin-bottom: 30px;
    text-shadow: 0 2px 4px rgba(74, 144, 226, 0.3);
    font-weight: 700;
}

/* Logo Container */
.logo-container {
    text-align: center;
    margin-bottom: 20px;
    animation: fadeIn 0.6s ease;
}

.main-logo {
    width: 120px;
    height: 120px;
    object-fit: contain;
    filter: drop-shadow(0 4px 12px rgba(74, 144, 226, 0.3));
    animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.page-title {
    font-size: 26px;
    color: var(--primary-color);
    margin-bottom: 25px;
    text-align: center;
}

/* Menu Grid */
.menu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.menu-btn {
    background: var(--white);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 30px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.menu-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(74, 144, 226, 0.3);
    border-color: var(--primary-color);
}

.menu-icon {
    font-size: 48px;
}

.menu-text {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    text-align: center;
}

/* Back Button */
.back-btn {
    background: var(--text-light);
    color: var(--white);
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: var(--text-dark);
}

/* Form Section */
.form-section {
    margin-bottom: 30px;
    padding: 20px;
    background: var(--bg-light);
    border-radius: 12px;
}

.form-section h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 20px;
}

.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-dark);
}

.input-group input,
.input-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s ease;
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

/* Buttons */
.generate-btn,
.calculate-btn {
    background: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.generate-btn:hover,
.calculate-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
}

.calculate-btn {
    width: 100%;
    padding: 15px;
    font-size: 18px;
    margin-top: 20px;
}

/* Dynamic Inputs */
.dynamic-input {
    margin-bottom: 10px;
}

.dynamic-input label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--text-dark);
}

.dynamic-input input {
    width: 100%;
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
}

/* Visual 0 effect for placeholders */
.dynamic-input input::placeholder,
.input-group input::placeholder {
    color: #BDC3C7;
    opacity: 0.6;
}

/* Install Button */
.install-btn {
    position: fixed;
    bottom: 80px;
    right: 20px;
    background: linear-gradient(135deg, #4A90E2 0%, #357ABD 100%);
    color: white;
    border: none;
    border-radius: 50px;
    padding: 15px 25px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(74, 144, 226, 0.4);
    z-index: 999;
    transition: all 0.3s ease;
    animation: slideInRight 0.5s ease, pulse 2s ease-in-out infinite;
}

.install-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 30px rgba(74, 144, 226, 0.6);
}

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

/* iOS Install Banner */
.ios-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, #4A90E2 0%, #357ABD 100%);
    color: white;
    padding: 20px;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.2);
    z-index: 1001;
    animation: slideInUp 0.5s ease;
}

.ios-banner-content {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}

.ios-banner-close {
    position: absolute;
    top: -10px;
    right: 0;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.ios-banner-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.ios-banner-icon {
    float: left;
    margin-right: 15px;
}

.ios-banner-text h3 {
    margin: 0 0 8px 0;
    font-size: 18px;
    font-weight: 700;
}

.ios-banner-text p {
    margin: 0 0 12px 0;
    font-size: 14px;
    line-height: 1.5;
    opacity: 0.95;
}

.ios-instructions {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 13px;
    background: rgba(255, 255, 255, 0.15);
    padding: 10px;
    border-radius: 8px;
    margin-top: 10px;
}

.ios-step {
    display: flex;
    align-items: center;
    gap: 8px;
}

.ios-step svg {
    flex-shrink: 0;
}

@keyframes slideInUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes slideInRight {
    from {
        transform: translateX(100px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 4px 20px rgba(74, 144, 226, 0.4);
    }
    50% {
        box-shadow: 0 4px 30px rgba(74, 144, 226, 0.7);
    }
}

/* Result Box */
.result-box {
    margin-top: 30px;
    padding: 25px;
    border-radius: 12px;
    display: none;
}

.result-box.show {
    display: block;
    animation: slideIn 0.4s ease;
}

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

.result-box.success {
    background: linear-gradient(135deg, #27AE60 0%, #229954 100%);
    color: var(--white);
}

.result-box.warning {
    background: linear-gradient(135deg, #F39C12 0%, #E67E22 100%);
    color: var(--white);
}

.result-box.danger {
    background: linear-gradient(135deg, #E74C3C 0%, #C0392B 100%);
    color: var(--white);
}

.result-box.info {
    background: linear-gradient(135deg, #3498DB 0%, #2980B9 100%);
    color: var(--white);
}

.result-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 15px;
    text-align: center;
}

.result-score {
    font-size: 48px;
    font-weight: 800;
    text-align: center;
    margin: 20px 0;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.result-message {
    font-size: 20px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 20px;
}

.result-stats {
    background: rgba(255, 255, 255, 0.2);
    padding: 15px;
    border-radius: 8px;
    margin-top: 15px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-label {
    font-weight: 500;
}

.stat-value {
    font-weight: 700;
}

/* Info Box */
.info-box {
    padding: 40px;
    text-align: center;
    background: var(--bg-light);
    border-radius: 12px;
}

.centered-text {
    font-size: 20px;
    color: var(--text-dark);
    font-style: serif;
}

/* Dictionary & Info Lists */
.dictionary-list,
.info-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.dictionary-item,
.info-item {
    padding: 20px;
    background: var(--bg-light);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
}

.dictionary-item strong,
.info-item strong {
    color: var(--primary-color);
    font-size: 18px;
    display: block;
    margin-bottom: 8px;
}

/* Links List */
.links-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.link-item {
    display: flex;
    align-items: center;
    padding: 20px;
    background: var(--bg-light);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-dark);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.link-item:hover {
    background: var(--white);
    border-color: var(--primary-color);
    transform: translateX(5px);
}

.link-icon {
    font-size: 32px;
    margin-right: 15px;
}

.link-text {
    flex: 1;
    font-weight: 600;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding-top: 70px;
    }

    .banner-content span {
        font-size: 14px;
    }

    .main-title {
        font-size: 24px;
    }

    .main-logo {
        width: 100px;
        height: 100px;
    }

    .page-title {
        font-size: 22px;
    }

    .menu-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 15px;
    }

    .menu-btn {
        padding: 20px 15px;
    }

    .menu-icon {
        font-size: 36px;
    }

    .menu-text {
        font-size: 14px;
    }

    .page {
        padding: 20px;
    }

    .result-score {
        font-size: 36px;
    }

    .result-message {
        font-size: 18px;
    }

    .install-btn {
        bottom: 70px;
        right: 15px;
        padding: 12px 20px;
        font-size: 14px;
    }

    .ios-banner {
        padding: 15px;
    }

    .ios-banner-text h3 {
        font-size: 16px;
    }

    .ios-banner-text p {
        font-size: 13px;
    }

    .ios-instructions {
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    .banner-content span {
        font-size: 12px;
    }

    .main-title {
        font-size: 20px;
    }

    .main-logo {
        width: 80px;
        height: 80px;
    }

    .menu-grid {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 0 15px 30px;
    }

    .install-btn {
        padding: 10px 18px;
        font-size: 13px;
    }

    .install-btn span {
        display: none;
    }
}