body {
    margin: 0;
    padding: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(180deg, #000000, #1c2526);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", sans-serif;
    overflow: hidden;
    color: #ffffff;
}
.container {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
}
.logo {
    position: absolute;
    top: 10%;
    width: 80px;
    cursor: pointer;
    transition: transform 0.3s ease, filter 0.3s ease;
}
.logo:hover {
    transform: scale(1.05);
    filter: brightness(1.1);
}
h1 {
    font-size: 3.5em;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: #ffffff;
    margin: 20px 0 8px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}
p.slogan {
    font-size: 1.2em;
    font-weight: 400;
    color: #a3a8ae;
    margin-bottom: 40px;
    letter-spacing: 0.02em;
    opacity: 0.9;
}
.btn {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(52, 199, 89, 0.5);
    border-radius: 14px;
    color: #ffffff;
    cursor: pointer;
    font-size: 1.1em;
    font-weight: 500;
    transition: background 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}
.btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}
.hero-button {
    padding: 16px 40px;
    font-size: 1.3em;
    animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
    0% {
        transform: scale(1);
        box-shadow: 0 4px 12px rgba(52, 199, 89, 0.2);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 6px 16px rgba(52, 199, 89, 0.3);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 4px 12px rgba(52, 199, 89, 0.2);
    }
}
.hero-button:hover {
    animation: none;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}
.social-buttons {
    position: absolute;
    bottom: 30px;
    display: flex;
    gap: 12px;
}
.social-buttons a {
    width: 44px;
    height: 44px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(52, 199, 89, 0.5);
    border-radius: 12px;
    transition: background 0.3s ease, transform 0.2s ease;
}
.social-buttons a:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}
.social-buttons a img {
    width: 24px;
    height: 24px;
    filter: brightness(0.9);
}
.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    display: none;
    animation: fadeIn 0.4s ease forwards;
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
.popup {
    background: rgba(28, 37, 38, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 18px;
    padding: 16px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    color: #ffffff;
    position: relative;
    z-index: 1001;
    margin: 20px;
}
.popup h2 {
    font-size: 1.6em;
    font-weight: 600;
    margin-bottom: 12px;
    color: #ffffff;
    text-align: center;
    letter-spacing: -0.01em;
}
.popup label {
    display: block;
    margin: 6px 0 4px;
    font-size: 0.9em;
    font-weight: 500;
    color: #d1d4d8;
}
.popup textarea, .popup input, .popup select {
    width: 100%;
    padding: 10px;
    margin-bottom: 8px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    font-size: 0.95em;
    box-sizing: border-box;
    transition: border-color 0.3s ease;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}
.popup textarea:focus, .popup input:focus, .popup select:focus {
    border-color: #34c759;
    outline: none;
}
.popup textarea {
    height: 60px;
    resize: none;
}
.popup textarea:invalid, .popup input:invalid {
    border-color: #ff4d4d;
}
.popup select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23ffffff' viewBox='0 0 24 24'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}
.popup select option {
    background: #1c2526;
    color: #ffffff;
}
.popup button {
    padding: 10px;
    font-size: 1.1em;
    width: 100%;
}
@media (max-width: 480px) {
    h1 {
        font-size: 2.2em;
    }
    p.slogan {
        font-size: 1em;
    }
    .hero-button {
        padding: 12px 30px;
        font-size: 1.1em;
    }
    .logo {
        width: 60px;
        top: 8%;
    }
    .social-buttons {
        bottom: 20px;
        gap: 10px;
    }
    .social-buttons a {
        width: 38px;
        height: 38px;
    }
    .social-buttons a img {
        width: 20px;
        height: 20px;
    }
    .popup {
        width: 85%;
        padding: 12px;
    }
    .popup h2 {
        font-size: 1.4em;
        margin-bottom: 10px;
    }
    .popup label {
        margin: 5px 0 3px;
    }
    .popup textarea, .popup input, .popup select {
        padding: 8px;
        margin-bottom: 6px;
    }
    .popup textarea {
        height: 50px;
    }
    .popup button {
        padding: 8px;
    }
}