/* Base Styles */
:root[data-theme="light"] {
    --primary-color: #6750A4;
    --on-primary-color: #FFFFFF;
    --surface-color: #FAFAFA;
    --on-surface-color: #1C1B1F;
    --surface-variant-color: #F4F4F5;
    --on-surface-variant-color: #49454F;
    --outline-color: #79747E;
    --error-color: #dc2626;
    --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
}

:root[data-theme="dark"] {
    --primary-color: #D0BCFF;
    --on-primary-color: #FFFFFF;
    --surface-color: #18181B;
    --on-surface-color: #FAFAFA;
    --surface-variant-color: #27272A;
    --on-surface-variant-color: #E4E4E7;
    --outline-color: #71717A;
    --error-color: #ef4444;
    --button-bg: #EFEFEF;
    --button-hover: #D4D4D4;
    --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

:root {
    --primary-color: #6750A4;
    --on-primary-color: #FFFFFF;
    --surface-color: #FFFBFE;
    --on-surface-color: #1C1B1F;
    --surface-variant-color: #E7E0EC;
    --on-surface-variant-color: #49454F;
    --outline-color: #79747E;
    --error-color: #dc3545;
    --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-family);
    background-color: var(--surface-color);
    color: var(--on-surface-color);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Main Content */
#main-content {
    flex: 1;
    padding: 12px;
    padding-bottom: 84px;
    max-width: 100%;
    margin: 0 auto;
    transition: padding 0.3s ease;
}

@media (min-width: 768px) {
    #main-content {
        padding: 24px;
        padding-bottom: 96px;
        max-width: 1200px;
    }
}

.view {
    display: none;
    opacity: 0;
    transform: translateY(20px) scale(0.98);
    transition: opacity 0.5s cubic-bezier(0.23, 1, 0.32, 1),
                transform 0.5s cubic-bezier(0.23, 1, 0.32, 1);
    will-change: opacity, transform;
    perspective: 1000px;
    backface-visibility: hidden;
}

.view.active {
    display: block;
    opacity: 1;
    transform: translateY(0) scale(1);
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInScale 0.6s cubic-bezier(0.23, 1, 0.32, 1) forwards;
}

.animate-up {
    animation: slideInUp 0.5s cubic-bezier(0.23, 1, 0.32, 1) forwards;
}

.stagger-in > * {
    opacity: 0;
    animation: slideInUp 0.5s cubic-bezier(0.23, 1, 0.32, 1) forwards;
}

.stagger-in > *:nth-child(1) { animation-delay: 0.1s; }
.stagger-in > *:nth-child(2) { animation-delay: 0.2s; }
.stagger-in > *:nth-child(3) { animation-delay: 0.3s; }
.stagger-in > *:nth-child(4) { animation-delay: 0.4s; }
.stagger-in > *:nth-child(5) { animation-delay: 0.5s; }

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--surface-color);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    justify-content: space-around;
    padding: 12px 8px;
    box-shadow: 0 -1px 12px rgba(0, 0, 0, 0.08);
    border-top: 1px solid var(--surface-variant-color);
    z-index: 1000;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 16px;
    border: none;
    background: none;
    color: var(--on-surface-variant-color);
    cursor: pointer;
    font-size: 0.75rem;
    transition: color 0.3s ease, background-color 0.3s ease, transform 0.3s ease;
    font-weight: 500;
    position: relative;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 12px;
    gap: 4px;
    min-width: 64px;
}

.nav-item:hover {
    color: var(--primary-color);
    background-color: rgba(103, 80, 164, 0.08);
    transform: translateY(-2px);
}

.nav-item.active {
    color: var(--primary-color);
    background-color: rgba(103, 80, 164, 0.12);
}

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    background-color: var(--primary-color);
    border-radius: 50%;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-item .material-symbols-outlined {
    font-size: 24px;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-item:hover .material-symbols-outlined,
.nav-item.active .material-symbols-outlined {
    transform: scale(1.1);
}

/* Modal Styles */
.modal-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    transition: opacity 0.3s ease;
    padding: 16px;
}

.modal-container.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal {
    background-color: var(--surface-color);
    border-radius: 24px;
    padding: 24px;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    transform: translateY(0);
    transition: transform 0.3s ease;
}

.modal-container.hidden .modal {
    transform: translateY(20px);
}

/* Form Elements */
.form-group {
    margin-bottom: 24px;
}

.form-group:last-child {
    margin-bottom: 0;
}

.skin-type-section .skin-type-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.skin-type-card {
    position: relative;
    display: block;
    cursor: pointer;
}

.skin-type-card input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.skin-type-card .card-content {
    display: block;
    padding: 16px;
    background-color: var(--surface-variant-color);
    border-radius: 12px;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.skin-type-card .card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.skin-type-card .card-title {
    font-weight: 500;
    color: var(--on-surface-color);
}

.skin-type-card .card-description {
    display: none;
    color: var(--on-surface-variant-color);
    font-size: 0.875rem;
    line-height: 1.5;
    margin-top: 8px;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.skin-type-card input[type="radio"]:checked + .card-content {
    border-color: var(--primary-color);
    background-color: var(--surface-color);
    box-shadow: var(--shadow-md);
}

.skin-type-card input[type="radio"]:checked + .card-content .card-description {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.skin-type-card:hover .card-content {
    border-color: var(--outline-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.skin-type-card .material-symbols-outlined {
    color: var(--primary-color);
    font-size: 24px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--on-surface-variant-color);
    font-size: 0.875rem;
    font-weight: 500;
}

input[type="text"],
input[type="number"],
input[type="date"],
input[type="file"],
select,
textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--outline-color);
    border-radius: 12px;
    font-family: var(--font-family);
    font-size: 1rem;
    background-color: var(--surface-variant-color);
    color: var(--on-surface-color);
    transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(103, 80, 164, 0.1);
}

button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 12px;
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

button.primary {
    background-color: var(--primary-color);
    color: var(--on-primary-color);
    box-shadow: var(--shadow-sm);
}

:root[data-theme="dark"] button.primary {
    background-color: var(--button-bg);
    color: var(--primary-color);
}

:root[data-theme="dark"] button.primary:hover {
    background-color: var(--button-hover);
}

.quick-actions button {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    background-color: var(--primary-color);
    color: var(--on-primary-color);
    box-shadow: var(--shadow-sm);
}

:root[data-theme="dark"] .quick-actions button {
    background-color: var(--button-bg);
    color: var(--primary-color);
}

:root[data-theme="dark"] .quick-actions button:hover {
    background-color: var(--button-hover);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

button:active {
    transform: translateY(1px);
    box-shadow: var(--shadow-sm);
}

/* View Header */
.view-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    margin-bottom: 24px;
}

.view-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--on-surface-color);
    margin: 0;
}

.view-header button {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: var(--primary-color);
    color: var(--on-primary-color);
    border: none;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.view-header button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.view-header button:active {
    transform: translateY(1px);
    box-shadow: var(--shadow-sm);
}