/* Root Variables */
:root {
    --bg: #f7f7fb;
    --card: #ffffff;
    --ink: #1f2937;
    --muted: #6b7280;
    --pri: #2563eb;
    --ring: #93c5fd;
}

/* Base Styles (Desktop-First) */
* {
    box-sizing: border-box;
    font-family: 'Noto Sans Devanagari', sans-serif;
}

body {
    background: var(--bg);
    margin: 0;
    color: var(--ink);
}

.app {
    max-width: 1300px;
    margin: 16px auto;
    padding: 12px;
}

.grid {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 16px;
}

.card {
    background: var(--card);
    border-radius: 8px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, .06);
    padding: 14px;
    -webkit-border-radius: 8px;
    -moz-border-radius: 8px;
    -ms-border-radius: 8px;
    -o-border-radius: 8px;
}

.card h1 {
    margin: 0 0 10px;
    font-size: 24px;
    text-align: center;
    color: #991b1b;
    text-decoration: underline;
}

#letter {
    text-align: justify;
}

.desc {
    color: var(--muted);
    font-size: 16px;
    margin-bottom: 10px;
}

form .row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

label {
    display: block;
    font-weight: 600;
    margin: 8px 0 5px;
    font-size: 16px;
}

input,
textarea,
select {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    background: #fff;
    color: var(--ink);
    outline: none;
    transition: border .2s, box-shadow .2s;
    font-size: 16px;
    touch-action: manipulation;
}

input:focus,
textarea:focus {
    border-color: var(--pri);
    box-shadow: 0 0 0 3px var(--ring);
}

textarea {
    min-height: 70px;
    resize: vertical;
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
    justify-content: center;
}

button {
    border: 0;
    border-radius: 8px;
    padding: 8px 14px;
    cursor: pointer;
    font-weight: 600;
    font-size: 16px;
    min-width: 100px;
    touch-action: manipulation;
    -webkit-border-radius: 8px;
    -moz-border-radius: 8px;
    -ms-border-radius: 8px;
    -o-border-radius: 8px;
}

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

.btn-ghost {
    background: #eef2ff;
    color: #1e3a8a;
}

.btn-danger {
    background: #fee2e2;
    color: #991b1b;
}

.letter-wrap {
    /* background: #790f0f; */
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 15mm;
    line-height: 1.6;
    font-size: 16px;
    width: 190mm;
    min-height: 267mm;
    box-sizing: border-box;
}

.letter-head {
    text-align: center;
    margin-bottom: 10px;
}

.letter-head .school-name {
    font-weight: 700;
    font-size: 16px;
}

.letter-head .school-address {
    color: var(--muted);
    font-size: 16px;
}

.meta-line {
    display: flex;
    justify-content: space-between;
    color: var(--muted);
    font-size: 16px;
    margin: 12px 0 16px;
}

.subject {
    font-weight: 700;
    margin: 14px 0;
    font-size: 18px;
}

.sig {
    margin-top: 35px;
}

.sig b {
    display: block;
    font-size: 16px;
}

.card p {
    margin: 10px 0;
}

/* Tablet Styles (≤800px) */
@media (max-width: 800px) {
    .app {
        margin: 12px auto;
        padding: 8px;
    }

    .grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .letter-wrap {
        width: 100%;
        min-height: auto;
        padding: 12px;
        font-size: 16px;
    }

    label {
        font-size: 16px;
    }

    .letter-head .school-name {
        font-size: 24px;
    }

    .letter-head .school-address,
    .meta-line,
    .sig b {
        font-size: 16px;
    }

    .subject {
        font-size: 16px;
    }
}

/* Mobile Styles (≤480px) */
@media (max-width: 480px) {
    .app {
        margin: 8px auto;
        padding: 6px;
    }

    label {
        font-size: 14px;
    }

    .card h1 {
        font-size: 22px;
    }

    form .row {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    input,
    textarea,
    select {
        font-size: 14px;
        padding: 7px 9px;
    }

    textarea {
        min-height: 60px;
    }

    button {
        font-size: 14px;
        padding: 7px 12px;
        min-width: 90px;
    }

    .letter-wrap {
        padding: 10px;
        font-size: 14px;
        line-height: 1.5;
    }

    .letter-head .school-name {
        font-size: 16px;
    }

    .letter-head .school-address,
    .meta-line,
    .sig b {
        font-size: 14px;
    }

    .subject {
        font-size: 16px;
    }

    .card p {
        margin: 8px 0;
    }
}

/* Print and PDF Styles */
@media print {
    .grid {
        grid-template-columns: 1fr;
        font-size: 22px;
    }

    .card.form {
        display: none;
    }

    body {
        background: #fff;
    }

    .letter-head .school-address,
    .meta-line,
    .sig b , .subject {
        font-size: 22px;
    }

    .letter-wrap {
        border: none;
        width: 210mm;
        height: 297mm;
        padding: 15mm;
        font-size: 22px;
        line-height: 1.6;
    }

    header,
    footer {
        display: none !important;
    }
}