/* RESET */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Inter", sans-serif;
}

:root {
    --bg: #f5f6fa;
    --text: #2d3436;
    --card-bg: #ffffff;
    --primary: #4c8bf5;
    --secondary: #f87171;
    --border: #dcdde1;
    --error-color: #d00000;
}

body.dark {
    --bg: #1e1e2f;
    --text: #f5f6fa;
    --card-bg: #2c2c3a;
    --primary: #422edf;
    --secondary: #df1c1c;
    --border: #3d3d4a;
    --error-color: #ff7373;
}

body {
    background-color: var(--bg);
    color: var(--text);
    transition: background-color 0.3s, color 0.3s;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
}

.logo {
    max-width: 100%;
}

.title {
    font-size: 1.5rem;
    font-weight: bold;
}

.theme-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: #aaa;
    border-radius: 24px;
    transition: 0.3s;
}

.slider:before {
    content: "";
    position: absolute;
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: 0.3s;
}

input:checked+.slider {
    background: var(--primary);
}

input:checked+.slider:before {
    transform: translateX(26px);
}

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem;
    gap: 1.5rem;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    width: 100%;
    max-width: 600px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: background-color 0.3s, border 0.3s;
}

.card h2 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
}

input,
select,
textarea {
    width: 100%;
    margin: 0.5rem 0;
    padding: 0.8rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--card-bg);
    color: var(--text);
    font-size: 1rem;
}

textarea {
    resize: vertical;
}

.buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.btn {
    flex: 1;
    padding: 0.8rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: 0.3s;
}

.btn.primary {
    background: var(--primary);
    color: #fff;
}

.btn.primary:hover {
    opacity: 0.9;
}

.btn.secondary {
    background: var(--secondary);
    color: #fff;
}

.btn.secondary:hover {
    opacity: 0.85;
}

.error {
    color: var(--error-color);
    text-align: center;
}

.loader {
    display: flex;
    gap: 6px;
    margin: 1rem 0;
}

.loader div {
    width: 10px;
    height: 10px;
    background: var(--primary);
    border-radius: 50%;
    animation: bounce 0.6s infinite alternate;
}

.loader div:nth-child(2) {
    animation-delay: 0.2s;
}

.loader div:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes bounce {
    from {
        transform: translateY(0);
        opacity: 0.5;
    }

    to {
        transform: translateY(-8px);
        opacity: 1;
    }
}

.hidden {
    display: none !important;
}

@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&display=swap');