:root {
    --primary: #4361ee;
    --secondary: #3f37c9;
    --success: #4bb543;
    --error: #ff4d4d;
    --text: #2b2d42;
    --bg-gradient: linear-gradient(135deg, #8543ee, #2c25a5);
    --card-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.2);
    --highlight: rgba(255, 255, 255, 0.1);
}

body {
    font-family: 'Poppins', 'Segoe UI', Arial, sans-serif;
    min-height: 100vh;
    margin: 0;
    padding: 40px 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text);
    position: relative;
    overflow-x: hidden;
    background-color: #1a1a1a;
    background-image: 
        linear-gradient(0deg, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.4) 100%),
        url('https://images.unsplash.com/photo-1492144534655-ae79c964c9d7?auto=format&fit=crop&w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        linear-gradient(45deg, rgba(0,0,0,0.8) 0%, transparent 40%),
        linear-gradient(-45deg, rgba(67,97,238,0.4) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* Animated light streaks */
@keyframes lightStreak {
    0% { transform: translateX(-100%) skewX(-45deg); opacity: 0; }
    25% { opacity: 0.5; }
    50% { opacity: 0.3; }
    100% { transform: translateX(200%) skewX(-45deg); opacity: 0; }
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 45%, rgba(255,255,255,0.1) 50%, transparent 55%);
    animation: lightStreak 6s infinite;
    pointer-events: none;
    z-index: 1;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.5); opacity: 0.8; }
    100% { transform: scale(1); opacity: 0.5; }
}

.container {
    position: relative;
    max-width: 480px;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 40px;
    border-radius: 24px;
    box-shadow: 
        0 8px 32px 0 rgba(31, 38, 135, 0.2),
        0 0 0 1px rgba(255, 255, 255, 0.2),
        inset 0 0 32px rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2;
    overflow: hidden;
    --mouse-x: 0;
    --mouse-y: 0;
}

.container::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(
        circle at var(--mouse-x) var(--mouse-y),
        rgba(255, 255, 255, 0.1) 0%,
        transparent 25%
    );
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.container:hover::after {
    opacity: 1;
}

.container::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(255,255,255,0.1) 0%, transparent 50%);
    animation: shimmer 10s infinite linear;
    pointer-events: none;
    z-index: -1;
}

@keyframes shimmer {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.container:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 45px 0 rgba(31, 38, 135, 0.25);
}

input, select {
    width: 100%;
    padding: 14px 16px;
    margin: 8px 0 20px 0;
    border: 2px solid transparent;
    border-radius: 12px;
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

input:hover, select:hover {
    background: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(67, 97, 238, 0.15);
    transform: translateY(-2px);
}

button {
    background: var(--bg-gradient);
    color: white;
    padding: 16px;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    width: 100%;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 6px 15px rgba(67, 97, 238, 0.3);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(67, 97, 238, 0.4);
}

button:active {
    transform: translateY(1px);
    box-shadow: 0 4px 10px rgba(67, 97, 238, 0.2);
}

button::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 300%;
    height: 300%;
    background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 60%);
    transform: translate(-50%, -50%) scale(0);
    transition: transform 0.6s ease-out;
}

button:hover::before {
    transform: translate(-50%, -50%) scale(1);
}

h2 {
    color: var(--text);
    margin-bottom: 30px;
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    background: var(--bg-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: titlePop 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes titlePop {
    0% { transform: scale(0.8); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

label {
    font-weight: 500;
    color: var(--text);
    display: block;
    margin-bottom: 8px;
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

label:hover {
    color: var(--primary);
}

.result {
    margin-top: 30px;
    padding: 20px;
    background: rgba(75, 181, 67, 0.1);
    border-radius: 16px;
    font-size: 1.25rem;
    color: var(--success);
    font-weight: 600;
    text-align: center;
    min-height: 32px;
    opacity: 0;
    transform: scale(0.95);
    backdrop-filter: blur(4px);
    box-shadow: 0 4px 15px rgba(75, 181, 67, 0.1);
    animation: resultPop 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    position: relative;
    overflow: hidden;
}

.result::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    animation: shine 3s infinite;
}

@keyframes shine {
    to {
        left: 100%;
    }
}

/* Confetti Animation */
.confetti {
    position: fixed;
    width: 10px;
    height: 10px;
    background: var(--confetti-color);
    opacity: 0;
    transform: translateY(0) rotate(var(--confetti-rotation));
    left: var(--confetti-x);
    animation: confetti-fall 3s ease-in-out forwards;
}

@keyframes confetti-fall {
    0% {
        opacity: 1;
        transform: translateY(-100vh) rotate(var(--confetti-rotation));
    }
    100% {
        opacity: 0;
        transform: translateY(100vh) rotate(calc(var(--confetti-rotation) + 360deg));
    }
}

@keyframes resultPop {
    0% { opacity: 0; transform: scale(0.8) translateY(20px); }
    70% { transform: scale(1.05) translateY(-5px); }
    100% { opacity: 1; transform: scale(1) translateY(0); }
}

.result:empty {
    display: none;
}

.error {
    background: rgba(255, 77, 77, 0.1);
    color: var(--error);
    box-shadow: 0 4px 15px rgba(255, 77, 77, 0.1);
}

.spinner {
    display: none;
    margin: 0 auto 24px auto;
    width: 40px;
    height: 40px;
    border: 3px solid rgba(67, 97, 238, 0.1);
    border-top: 3px solid var(--primary);
    border-right: 3px solid var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    box-shadow: 0 0 15px rgba(67, 97, 238, 0.2);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.tooltip {
    position: relative;
    display: inline-block;
    margin-left: 6px;
    cursor: help;
    transition: all 0.3s ease;
}

.tooltip:hover {
    transform: scale(1.1);
    color: var(--primary);
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background: rgba(43, 45, 66, 0.95);
    color: #fff;
    text-align: center;
    border-radius: 8px;
    padding: 10px 12px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    font-size: 0.9rem;
    backdrop-filter: blur(4px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transform: translateY(10px) scale(0.95);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
    transform: translateY(0) scale(1);
}

.footer {
    margin-top: 40px;
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

@media (max-width: 600px) {
    body { padding: 20px 15px; }
    .container { 
        padding: 30px 20px;
        border-radius: 20px;
    }
    h2 { font-size: 1.75rem; }
    input, select, button { padding: 12px; }
}