:root {
    --md-sys-color-primary: #1565C0;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #D1E4FF;
    --md-sys-color-on-primary-container: #001D36;
    --md-sys-color-secondary: #455A64;
    --md-sys-color-secondary-container: #CFD8DC;
    --md-sys-color-surface: #F5F9FF;
    --md-sys-color-surface-variant: #E1E8ED;
    --md-sys-color-outline: #79747E;
    --transition-duration: 0.2s;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: #FDFBFF;
    color: #1C1B1F;
}

/* Material Design Utilities */
.material-card {
    background: var(--md-sys-color-surface);
    border-radius: 16px;
    box-shadow: 0px 1px 3px 1px rgba(0, 0, 0, 0.15), 0px 1px 2px 0px rgba(0, 0, 0, 0.3);
    transition: box-shadow var(--transition-duration), transform var(--transition-duration);
}

.material-card:hover {
    box-shadow: 0px 4px 8px 3px rgba(0, 0, 0, 0.15), 0px 1px 3px 0px rgba(0, 0, 0, 0.3);
    transform: translateY(-2px);
}

.material-btn {
    border-radius: 20px;
    padding: 10px 24px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: all var(--transition-duration);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.material-btn-primary {
    background-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
}

.material-btn-primary:hover {
    background-color: #0D47A1;
    box-shadow: 0px 2px 4px -1px rgba(0,0,0,0.2), 0px 4px 5px 0px rgba(0,0,0,0.14), 0px 1px 10px 0px rgba(0,0,0,0.12);
}

.material-btn-outlined {
    border: 1px solid var(--md-sys-color-outline);
    color: var(--md-sys-color-primary);
    background: transparent;
}

.material-btn-outlined:hover {
    background-color: rgba(21, 101, 192, 0.08);
}

.material-input {
    background-color: var(--md-sys-color-surface-variant);
    border-radius: 4px 4px 0 0;
    border-bottom: 1px solid var(--md-sys-color-outline);
    transition: border-color var(--transition-duration);
}

.material-input:focus {
    border-bottom: 2px solid var(--md-sys-color-primary);
    outline: none;
}

/* Custom Interactions */
.ripple {
    position: relative;
    overflow: hidden;
}

.ripple::after {
    content: "";
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    background-image: radial-gradient(circle, #fff 10%, transparent 10.01%);
    background-repeat: no-repeat;
    background-position: 50%;
    transform: scale(10, 10);
    opacity: 0;
    transition: transform .5s, opacity 1s;
}

.ripple:active::after {
    transform: scale(0, 0);
    opacity: 0.3;
    transition: 0s;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }

/* Navigation Rail for Desktop */
@media (min-width: 1024px) {
    .nav-rail {
        width: 80px;
        height: 100vh;
        position: fixed;
        left: 0;
        top: 0;
        background: var(--md-sys-color-surface);
        border-right: 1px solid var(--md-sys-color-outline);
    }
    .main-content {
        margin-left: 80px;
    }
}