/* ============================================
   Advanced Gradient System for Dr. Saghar Anbari Website
   ============================================ */

:root {
    /* Primary Gradient Colors */
    --gradient-primary-start: #0ea5e9;
    --gradient-primary-mid: #6366f1;
    --gradient-primary-end: #a855f7;
    --gradient-primary-light: #e0f2fe;
    
    /* Extended Gradient Palette */
    --gradient-purple-1: #8b5cf6;
    --gradient-purple-2: #7c3aed;
    --gradient-purple-3: #a855f7;
    --gradient-purple-4: #9333ea;
    --gradient-purple-5: #6d28d9;
    --gradient-purple-6: #5b21b6;
    --gradient-purple-7: #4c1d95;
    
    /* Main Gradients */
    --gradient-main: linear-gradient(135deg, var(--gradient-primary-start) 0%, var(--gradient-primary-mid) 50%, var(--gradient-primary-end) 100%);
    --gradient-main-reverse: linear-gradient(135deg, var(--gradient-primary-end) 0%, var(--gradient-primary-mid) 50%, var(--gradient-primary-start) 100%);
    --gradient-main-horizontal: linear-gradient(90deg, var(--gradient-primary-start) 0%, var(--gradient-primary-mid) 50%, var(--gradient-primary-end) 100%);
    --gradient-main-vertical: linear-gradient(180deg, var(--gradient-primary-start) 0%, var(--gradient-primary-mid) 50%, var(--gradient-primary-end) 100%);
    
    /* Extended Multi-Color Gradients */
    --gradient-extended: linear-gradient(135deg, 
        #8b5cf6 0%, 
        #7c3aed 12.5%, 
        #a855f7 25%, 
        #9333ea 37.5%, 
        #6d28d9 50%, 
        #5b21b6 62.5%, 
        #4c1d95 75%, 
        #6A1B9A 87.5%, 
        #9C27B0 100%
    );
    
    --gradient-text: linear-gradient(135deg, 
        #8b5cf6 0%, 
        #7c3aed 25%, 
        #a855f7 50%, 
        #9333ea 75%, 
        #6d28d9 100%
    );
    
    /* Gradient Lines */
    --gradient-line-horizontal: linear-gradient(90deg, 
        transparent 0%, 
        var(--gradient-purple-1) 20%, 
        var(--gradient-purple-3) 50%, 
        var(--gradient-purple-1) 80%, 
        transparent 100%
    );
    
    --gradient-line-vertical: linear-gradient(180deg, 
        transparent 0%, 
        var(--gradient-purple-1) 20%, 
        var(--gradient-purple-3) 50%, 
        var(--gradient-purple-1) 80%, 
        transparent 100%
    );
    
    --gradient-line-diagonal: linear-gradient(135deg, 
        transparent 0%, 
        var(--gradient-purple-1) 30%, 
        var(--gradient-purple-3) 50%, 
        var(--gradient-purple-1) 70%, 
        transparent 100%
    );
    
    /* Gradient Patterns */
    --gradient-pattern-1: repeating-linear-gradient(
        45deg,
        var(--gradient-purple-1) 0px,
        var(--gradient-purple-1) 2px,
        transparent 2px,
        transparent 8px
    );
    
    --gradient-pattern-2: repeating-linear-gradient(
        90deg,
        var(--gradient-purple-2) 0px,
        var(--gradient-purple-2) 1px,
        transparent 1px,
        transparent 10px
    );
    
    /* Gradient Shadows */
    --gradient-shadow-sm: 0 2px 8px rgba(99, 102, 241, 0.18);
    --gradient-shadow-md: 0 6px 18px rgba(99, 102, 241, 0.22);
    --gradient-shadow-lg: 0 14px 40px rgba(99, 102, 241, 0.28);
    --gradient-shadow-xl: 0 22px 70px rgba(99, 102, 241, 0.35);
    
    /* Gradient Borders */
    --gradient-border: 2px solid;
    --gradient-border-thick: 3px solid;
}

/* ============================================
   Gradient Background Classes
   ============================================ */

.gradient-bg-main {
    background: var(--gradient-main);
}

.gradient-bg-extended {
    background: var(--gradient-extended);
    background-size: 400% 400%;
    animation: gradientShift 8s ease infinite;
}

.gradient-bg-horizontal {
    background: var(--gradient-main-horizontal);
}

.gradient-bg-vertical {
    background: var(--gradient-main-vertical);
}

.gradient-bg-radial {
    background: radial-gradient(circle at center, var(--gradient-primary-end) 0%, var(--gradient-primary-start) 100%);
}

/* ============================================
   Gradient Text Classes
   ============================================ */

.gradient-text-primary {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradientTextShift 4s ease infinite;
}

.gradient-text-extended {
    background: var(--gradient-extended);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 400% 400%;
    animation: gradientShift 6s ease infinite;
}

.gradient-text-hover {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all 0.3s ease;
}

.gradient-text-hover:hover {
    background-size: 200% 200%;
    animation: gradientTextShift 2s ease infinite;
}

/* ============================================
   Gradient Lines
   ============================================ */

.gradient-line {
    height: 2px;
    background: var(--gradient-line-horizontal);
    border: none;
    margin: 20px 0;
    position: relative;
    overflow: hidden;
}

.gradient-line::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-line-horizontal);
    animation: gradientLineMove 3s linear infinite;
}

.gradient-line-vertical {
    width: 2px;
    height: 100%;
    background: var(--gradient-line-vertical);
    border: none;
    margin: 0 20px;
}

.gradient-line-diagonal {
    height: 2px;
    background: var(--gradient-line-diagonal);
    border: none;
    margin: 20px 0;
    transform: rotate(-45deg);
}

.gradient-line-thick {
    height: 4px;
    background: var(--gradient-line-horizontal);
    border: none;
    margin: 30px 0;
}

.gradient-line-thick::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-line-horizontal);
    animation: gradientLineMove 2s linear infinite;
}

/* ============================================
   Gradient Borders
   ============================================ */

.gradient-border {
    position: relative;
    background: white;
    border-radius: 12px;
}

.gradient-border::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 12px;
    padding: 2px;
    background: var(--gradient-main);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
}

.gradient-border-thick::before {
    padding: 3px;
}

.gradient-border-hover {
    position: relative;
    transition: all 0.3s ease;
}

.gradient-border-hover::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 2px;
    background: var(--gradient-main);
    opacity: 0;
    transition: opacity 0.3s ease;
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
}

.gradient-border-hover:hover::before {
    opacity: 1;
}

/* ============================================
   Gradient Buttons
   ============================================ */

.btn-gradient {
    background: var(--gradient-main);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-gradient::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-main-reverse);
    transition: left 0.3s ease;
    z-index: 0;
}

.btn-gradient span {
    position: relative;
    z-index: 1;
}

.btn-gradient:hover::before {
    left: 0;
}

.btn-gradient:hover {
    transform: translateY(-2px);
    box-shadow: var(--gradient-shadow-lg);
}

.btn-gradient-outline {
    background: transparent;
    color: var(--gradient-primary-mid);
    border: none;
    padding: 10px 28px;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    z-index: 1;
}

.btn-gradient-outline::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 28px;
    background: var(--gradient-main);
    padding: 2px;
    transform: skewX(-10deg);
    z-index: -1;
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
}

.btn-gradient-outline:hover {
    background: var(--gradient-main);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--gradient-shadow-md);
}

/* ============================================
   Gradient Cards
   ============================================ */

.gradient-card {
    background: rgba(255, 255, 255, 0.92);
    border-radius: 18px;
    padding: 24px;
    border: 1px solid rgba(99, 102, 241, 0.14);
    box-shadow: var(--gradient-shadow-md);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(8px);
}

.gradient-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-main);
}

.gradient-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--gradient-shadow-lg);
    border-color: rgba(99, 102, 241, 0.3);
}

.gradient-card-full {
    background: var(--gradient-main);
    color: white;
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--gradient-shadow-lg);
    transition: all 0.3s ease;
}

.gradient-card-full:hover {
    transform: translateY(-5px);
    box-shadow: var(--gradient-shadow-xl);
    background: var(--gradient-extended);
    background-size: 400% 400%;
    animation: gradientShift 3s ease infinite;
}

/* ============================================
   Gradient Patterns
   ============================================ */

.gradient-pattern-1 {
    background: var(--gradient-pattern-1);
    background-color: rgba(139, 92, 246, 0.05);
}

.gradient-pattern-2 {
    background: var(--gradient-pattern-2);
    background-color: rgba(124, 58, 237, 0.05);
}

.gradient-overlay {
    position: relative;
}

.gradient-overlay::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-main);
    opacity: 0.1;
    pointer-events: none;
}

/* ============================================
   Gradient Shadows
   ============================================ */

.gradient-shadow-sm {
    box-shadow: var(--gradient-shadow-sm);
}

.gradient-shadow-md {
    box-shadow: var(--gradient-shadow-md);
}

.gradient-shadow-lg {
    box-shadow: var(--gradient-shadow-lg);
}

.gradient-shadow-xl {
    box-shadow: var(--gradient-shadow-xl);
}

.gradient-glow {
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.5);
}

.gradient-glow-lg {
    box-shadow: 0 0 40px rgba(139, 92, 246, 0.6);
}

/* ============================================
   Animations
   ============================================ */

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

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

@keyframes gradientLineMove {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

@keyframes gradientPulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

.gradient-pulse {
    animation: gradientPulse 2s ease-in-out infinite;
}

/* ============================================
   Utility Classes
   ============================================ */

.gradient-separator {
    margin: 40px 0;
    height: 1px;
    background: var(--gradient-line-horizontal);
    border: none;
    position: relative;
}

.gradient-separator::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.gradient-accent {
    position: relative;
}

.gradient-accent::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--gradient-main);
    border-radius: 2px;
}

/* ============================================
   Responsive Adjustments
   ============================================ */

@media (max-width: 768px) {
    .gradient-line {
        margin: 5px 0 !important;
    }
    
    .gradient-card {
        padding: 20px;
    }
    
    .btn-gradient {
        padding: 10px 24px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .gradient-card {
        padding: 16px;
    }
    
    .btn-gradient {
        padding: 8px 20px;
        font-size: 13px;
    }
}