/* أسلوب عام */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    color: #222;
    overflow-x: hidden;
    perspective: 1000px;
    transition: background-color 0.5s, color 0.5s;
}

/* خلفية ثلاثية الأبعاد */
.background-3d {
    position: fixed;
    top: 0; left: 0;
    width: 200%; height: 200%;
    background: linear-gradient(120deg, #4CAF50, #2E8B57, #4CAF50, #2E8B57);
    background-size: 400% 400%;
    animation: gradientMove 20s ease infinite, rotate3D 60s linear infinite;
    z-index: -1;
    opacity: 0.25;
}

@keyframes gradientMove {
    0% {background-position:0% 50%;}
    50% {background-position:100% 50%;}
    100% {background-position:0% 50%;}
}

@keyframes rotate3D {
    0% {transform: rotateX(0deg) rotateY(0deg);}
    50% {transform: rotateX(10deg) rotateY(10deg);}
    100% {transform: rotateX(0deg) rotateY(0deg);}
}

/* الهيدر */
header {
    background: rgba(0,0,0,0.4);
    color: white;
    padding: 40px 20px;
    text-align: center;
    border-bottom: 2px solid #fff;
}

header nav a {
    color: white;
    margin: 0 12px;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s, transform 0.3s;
}

header nav a:hover {
    color: #FFD700;
    transform: scale(1.15) rotateZ(2deg);
}

/* الأقسام */
section {
    padding: 50px 20px;
    margin: 20px auto;
    max-width: 800px;
    background-color: rgba(255,255,255,0.85);
    border-radius: 15px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.25);
    transition: background-color 0.3s, color 0.3s, transform 0.3s;
}

section:hover {
    transform: translateY(-5px) scale(1.02);
}

/* الأزرار */
.button {
    display: inline-block;
    background-color: #4CAF50;
    color: white;
    padding: 15px 25px;
    text-decoration: none;
    border-radius: 12px;
    margin: 10px 10px 0 10px;
    transition: background-color 0.3s, transform 0.3s, box-shadow 0.3s;
}

.button:hover {
    background-color: #45a049;
    transform: scale(1.15) rotateZ(-2deg);
    box-shadow: 0 8px 20px rgba(0,0,0,0.35);
}

/* زر التطبيق */
#app-button {
    background-color: #FF5722;
}

#app-button:hover {
    background-color: #E64A19;
}

/* فوتر */
footer {
    background-color: #222;
    color: white;
    padding: 20px;
    text-align: center;
    border-top: 2px solid #fff;
}

/* وضع ليلي */
body.dark-mode {
    background-color: #1e1e1e;
    color: #f5f5f5;
}

body.dark-mode section {
    background-color: rgba(50,50,50,0.85);
}

body.dark-mode .button {
    background-color: #555;
}

body.dark-mode .button:hover {
    background-color: #777;
    box-shadow: 0 8px 20px rgba(255,255,255,0.3);
}

body.dark-mode #app-button {
    background-color: #777;
}

body.dark-mode #app-button:hover {
    background-color: #999;
}

/* أنيميشن عند الدخول */
.fade-in {
    opacity: 0;
    animation: fadeIn 2s forwards;
}

.fade-up {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 1.5s forwards;
}

@keyframes fadeIn {
    to {opacity:1;}
}

@keyframes fadeUp {
    to {opacity:1; transform:translateY(0);}
}

/* أزرار متحركة */
.btn-animated {
    animation: floatBtn 3s ease-in-out infinite;
}

@keyframes floatBtn {
    0%,100% {transform: translateY(0);}
    50% {transform: translateY(-6px);}
}