@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC&display=swap');

:root {
    /* Default to light theme (Rose Pine Dawn) */
    --base: #faf4ed;
    --surface: #fffaf3;
    --overlay: #f2e9e1;
    --muted: #9893a5;
    --subtle: #797593;
    --text: #575279;
    --love: #b4637a;
    --gold: #ea9d34;
    --rose: #d7827e;
    --pine: #286983;
    --foam: #56949f;
    --iris: #907aa9;
    --highlight-low: #f4ede8;
    --highlight-med: #dfdad9;
    --highlight-high: #cecacd;
}

/* Dark theme (Rose Pine) */
[data-theme="dark"] {
    --base: #191724;
    --surface: #1f1d2e;
    --overlay: #26233a;
    --muted: #6e6a86;
    --subtle: #908caa;
    --text: #e0def4;
    --love: #eb6f92;
    --gold: #f6c177;
    --rose: #ebbcba;
    --pine: #31748f;
    --foam: #9ccfd8;
    --iris: #c4a7e7;
    --highlight-low: #21202e;
    --highlight-med: #403d52;
    --highlight-high: #524f67;
}

body {
    font-family: 'Noto Sans SC', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--base);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    color: var(--text);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--overlay);
    color: var(--text);
    border: none;
    border-radius: 8px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background: var(--highlight-med);
    transform: translateY(-2px);
}

.theme-toggle svg {
    margin-right: 0.5rem;
    width: 16px;
    height: 16px;
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2.5rem;
    border-radius: 15px;
    background: var(--surface);
    box-shadow: 0 8px 32px rgba(87, 82, 121, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid var(--highlight-med);
    animation: fadeIn 0.5s ease-in-out;
}

h1,
h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text);
    font-weight: 600;
}

h1 {
    font-size: 1.8rem;
}

h2 {
    font-size: 1.5rem;
}

p {
    color: var(--text);
    line-height: 1.6;
    margin: 0.75rem 0;
}

code {
    background: var(--highlight-low);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', monospace;
    color: var(--pine);
}

.btn {
    padding: 8px 16px;
    background: var(--pine);
    color: var(--surface);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn:hover {
    background: var(--foam);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(86, 148, 159, 0.2);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--subtle);
    font-size: 14px;
    font-weight: 500;
}

.form-input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--highlight-med);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    background: var(--surface);
    color: var(--text);
    box-sizing: border-box;
}

.form-input:focus {
    outline: none;
    border-color: var(--foam);
    box-shadow: 0 0 0 3px rgba(86, 148, 159, 0.1);
}

.error {
    color: var(--love);
    margin-bottom: 1.2rem;
    text-align: center;
    font-size: 14px;
    padding: 10px;
    background: rgba(180, 99, 122, 0.1);
    border-radius: 6px;
    border: 1px solid rgba(180, 99, 122, 0.2);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    body {
        padding: 1rem;
    }

    .container {
        margin: 1rem auto;
        padding: 1.5rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    p {
        font-size: 0.95rem;
    }

    .theme-toggle {
        top: 0.5rem;
        right: 0.5rem;
        padding: 0.3rem 0.7rem;
        font-size: 0.8rem;
    }
}

.instruction-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.instruction-card {
    background: var(--highlight-low);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    border: 1px solid var(--highlight-med);
}

.instruction-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
    border-color: var(--highlight-high);
}

.instruction-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    text-align: center;
}

.instruction-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
    color: var(--text);
    text-align: center;
}

.instruction-card p {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.instruction-card p:last-child {
    margin-bottom: 0;
}

.note {
    font-size: 0.85rem;
    color: var(--rose);
    font-style: italic;
}

@media (max-width: 768px) {
    .instruction-cards {
        grid-template-columns: 1fr;
    }
}