* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Disable all transitions on page load */
html.no-transition,
html.no-transition *,
html.no-transition *::before,
html.no-transition *::after {
    transition: none !important;
    animation: none !important;
}

:root {
    --primary: #0078d4;
    --primary-hover: #106ebe;
    --success: #10b981;
    --bg-light: #f3f3f3;
    --bg-dark: #1e1e1e;
    --card-light: #ffffff;
    --card-dark: #2d2d2d;
    --text-light: #1a1a1a;
    --text-dark: #f0f0f0;
    --border-light: #e0e0e0;
    --border-dark: #4a4a4a;
}

body {
    font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-light);
    transition:
        background-color 0.3s ease,
        color 0.3s ease;
    min-height: 100vh;
}

body.dark,
html.dark body {
    background-color: var(--bg-dark);
    color: var(--text-dark);
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Navigation */
.nav {
    background: var(--card-light);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    transition:
        background-color 0.3s ease,
        box-shadow 0.3s ease;
}

body.dark .nav,
html.dark .nav {
    background: var(--card-dark);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav h1 {
    font-size: 24px;
    font-weight: 600;
}

.nav-buttons {
    display: flex;
    gap: 10px;
}

.nav-button {
    background: transparent;
    border: 2px solid var(--border-light);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-light);
}

body.dark .nav-button,
html.dark .nav-button {
    border-color: var(--border-dark);
    color: var(--text-dark);
}

.nav-button:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.nav-button.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.theme-toggle {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 24px;
    padding: 8px 16px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(0, 120, 212, 0.3);
}

.theme-toggle:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 120, 212, 0.4);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Tool sections */
.tool-section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tool-section.active {
    display: block;
}

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

/* Cards */
.card {
    background: var(--card-light);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
    transition:
        background-color 0.3s ease,
        box-shadow 0.3s ease;
}

body.dark .card,
html.dark .card {
    background: var(--card-dark);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    opacity: 0.8;
    margin-bottom: 12px;
}

/* Form elements */
.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.8;
}

input[type="text"],
input[type="number"],
select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-light);
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
    transition: all 0.2s ease;
    background: var(--card-light);
    color: var(--text-light);
}

body.dark input[type="text"],
body.dark input[type="number"],
body.dark select,
html.dark input[type="text"],
html.dark input[type="number"],
html.dark select {
    border-color: var(--border-dark);
    color: var(--text-dark);
    background: var(--card-dark);
}

body.dark select option,
html.dark select option {
    background: var(--card-dark);
    color: var(--text-dark);
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 120, 212, 0.2);
}

/* Color scheme for form controls (fixes Firefox spinners) */
input[type="number"] {
    color-scheme: light;
}

body.dark input[type="number"],
html.dark input[type="number"] {
    color-scheme: dark;
}

/* Buttons */
.button {
    background: var(--primary);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(0, 120, 212, 0.3);
}

.button:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 120, 212, 0.4);
}

.button.success {
    background: var(--success);
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.button.secondary {
    background: var(--border-light);
    color: var(--text-light);
    box-shadow: none;
}

body.dark .button.secondary,
html.dark .button.secondary {
    background: var(--border-dark);
    color: var(--text-dark);
}

.button.secondary:hover {
    background: var(--border-dark);
    transform: translateY(-2px);
}

.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.button-group.centered {
    justify-content: center;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-content {
        flex-direction: column;
        gap: 15px;
    }
    .nav-buttons {
        width: 100%;
        justify-content: center;
    }
    .button-group {
        justify-content: center;
    }
}