* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html,
body {
    height: 100%;
}
body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background-color: #fcfcfc; /* Kırmızı */
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: #fff;
    padding: 1rem;
}

.container {
    background: rgba(0, 0, 0, 0.5); /* Slightly more opaque for readability */
    border-radius: 20px;
    margin-bottom: 10%;
    width: 90%;
    text-align: center;
    position: relative;
    overflow: hidden;
}
@keyframes containerGlow {
    0% {
        box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3),
            0 0 20px rgba(255, 255, 255, 0.1);
    }
    100% {
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4),
            0 0 30px rgba(255, 255, 255, 0.2);
    }
}
.container {
    animation: containerGlow 3s ease-in-out infinite alternate;
}
h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: #fff;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7),
        0 0 15px rgba(255, 255, 255, 0.3);
    font-weight: 700;
    letter-spacing: -0.5px;
    animation: titlePulse 2s ease-in-out infinite alternate;
}
@keyframes titlePulse {
    0% {
        text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7),
            0 0 15px rgba(255, 255, 255, 0.3);
    }
    100% {
        text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7),
            0 0 25px rgba(255, 255, 255, 0.5);
    }
}
p {
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 1.2rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.8);
    color: #fff;
    font-weight: 400;
    text-align: justify;
    text-align-last: center;
    padding: 0 0.5rem;
}
p:last-of-type {
    margin-bottom: 1.5rem;
}
.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio (9/16 = 0.5625) */
    height: 0;
    overflow: hidden;
    margin-bottom: 1.5rem;
    max-width: 100%;
}
.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}
.btn {
    background: linear-gradient(135deg, #e74c3c 0%, #c0392b 50%, #a93226 100%);
    color: white;
    padding: 0.9rem 2.5rem;
    border: none;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.btn::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    transition: left 0.4s ease;
}
.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(231, 76, 60, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    background: linear-gradient(135deg, #ec7063 0%, #cb4335 50%, #b03a2e 100%);
}
.btn:hover::before {
    left: 100%;
}
.btn:active {
    transform: translateY(0);
}
.btn:focus {
    outline: 2px solid #fff;
    outline-offset: 2px;
}

/* Large screens */
@media (min-width: 1200px) {
    .container {
        max-width: 700px;
        padding: 3rem;
        margin-top: 10%;
    }
    h1 {
        font-size: 3rem;
    }
    .video-wrapper {
        margin-bottom: 2rem;
    }
}

/* Tablet */
@media (max-width: 992px) {
    .container {
        max-width: 500px;
        margin-top: 10%;
    }
    h1 {
        font-size: 2rem;
    }
    p {
        font-size: 1rem;
    }
    .video-wrapper {
        margin-bottom: 1.5rem;
    }
}

/* Mobile */
@media (max-width: 768px) {
    body {
        padding: 0.5rem;
        margin-top: 10%;
    }
    .container {
        width: 95%;
        padding: 1.5rem;
        border-radius: 15px;
        margin: 1rem 0;
    }
    h1 {
        font-size: 1.8rem;
        margin-bottom: 1rem;
    }
    p {
        font-size: 0.95rem;
        line-height: 1.5;
    }
    .btn {
        font-size: 1rem;
        padding: 0.8rem 2rem;
        width: 100%;
    }
    .video-wrapper {
        margin-bottom: 1.2rem;
    }
}

/* Very small screens */
@media (max-width: 480px) {
    .container {
        padding: 1rem;
        margin-top: 10%;
    }
    h1 {
        font-size: 1.5rem;
    }
    p {
        font-size: 0.85rem;
    }
    .btn {
        font-size: 0.9rem;
        padding: 0.7rem 1.5rem;
    }
    .video-wrapper {
        margin-bottom: 1rem;
    }
}

/* Landscape orientation for small screens */
@media (max-height: 500px) and (orientation: landscape) {
    body {
        align-items: flex-start;
        padding-top: 0.5rem;
    }
    .container {
        margin: 0.5rem 0;
        padding: 1.2rem;
    }
    h1 {
        font-size: 1.6rem;
        margin-bottom: 0.8rem;
    }
    p {
        font-size: 0.9rem;
        margin-bottom: 0.8rem;
    }
    .btn {
        font-size: 0.9rem;
        padding: 0.6rem 1.5rem;
    }
    .video-wrapper {
        margin-bottom: 0.8rem;
    }
}