/* ========================================================
   SOLUTION SUBMISSION MAILBOX (PINK AESTHETIC)
   ======================================================== */
:root {
    --accent-pink: #ff69b4;
    --accent-pink-dim: rgba(255, 105, 180, 0.15);
    --accent-pink-hover: rgba(255, 105, 180, 0.4);
}

.solution-mailbox {
    margin-top: 50px;
    background: linear-gradient(145deg, rgba(255, 105, 180, 0.05), rgba(255, 20, 147, 0.02));
    border: 1px solid rgba(255, 105, 180, 0.25);
    border-radius: 12px;
    padding: 35px 40px;
    box-shadow: 0 10px 30px rgba(255, 105, 180, 0.08), inset 0 2px 10px rgba(255, 105, 180, 0.05);
    color: var(--exam-text-color);
}

body:not(.dark-mode) .solution-mailbox {
    background: linear-gradient(145deg, rgba(255, 105, 180, 0.08), rgba(255, 20, 147, 0.03));
    border-color: rgba(255, 105, 180, 0.3);
}

.mailbox-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 8px;
}

.mailbox-icon {
    font-size: 2.2rem;
}

.mailbox-title {
    font-family: 'Playfair Display', serif;
    font-size: 1.85rem;
    font-weight: 700;
    color: var(--accent-pink);
    line-height: 1.2;
}

.mailbox-subtitle {
    color: var(--exam-text-color);
    font-size: 1.05rem;
    margin-bottom: 28px;
    line-height: 1.6;
    opacity: 0.82;
    padding-left: 62px;
}

.mailbox-subtitle em {
    color: var(--accent-pink);
    font-style: normal;
    font-weight: 600;
}

.mailbox-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

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

@media (max-width: 700px) {
    .mailbox-row {
        grid-template-columns: 1fr;
    }
}

.mailbox-field {
    display: flex;
    flex-direction: column;
    gap: 7px;
}

.mailbox-label {
    font-size: 0.9rem;
    letter-spacing: 1.3px;
    text-transform: uppercase;
    color: var(--accent-pink);
    font-family: 'JetBrains Mono', monospace;
}

.mailbox-label .req {
    color: #f87171;
    margin-left: 3px;
}

.mailbox-input, .mailbox-textarea, .mailbox-select {
    background: rgba(255, 105, 180, 0.03);
    border: 1px solid rgba(255, 105, 180, 0.2);
    border-radius: 8px;
    padding: 12px 15px;
    color: var(--exam-text-color);
    font-size: 1.1rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    width: 100%;
    box-sizing: border-box;
}

body:not(.dark-mode) .mailbox-input,
body:not(.dark-mode) .mailbox-select,
body:not(.dark-mode) .mailbox-textarea {
    background: rgba(255, 105, 180, 0.05);
    border-color: rgba(255, 105, 180, 0.25);
}

.mailbox-input:focus, .mailbox-select:focus, .mailbox-textarea:focus {
    border-color: var(--accent-pink);
    box-shadow: 0 0 0 3px var(--accent-pink-dim);
}

.mailbox-input::placeholder, .mailbox-textarea::placeholder {
    color: rgba(180,180,180,0.45);
    font-style: italic;
}

.mailbox-select option { background: #0b1111; color: #ddd; }
body:not(.dark-mode) .mailbox-select option { background: #fff; color: #334155; }

.mailbox-textarea {
    font-family: "Times New Roman", Times, serif;
    font-size: 1.15rem;
    min-height: 180px;
    resize: vertical;
    line-height: 1.6;
}

.mailbox-hint {
    font-size: 0.85rem;
    color: var(--exam-text-color);
    opacity: 0.7;
    margin-top: -3px;
}

.mailbox-hint code {
    background: var(--accent-pink-dim);
    padding: 1px 5px;
    border-radius: 4px;
    color: var(--accent-pink);
    font-family: 'JetBrains Mono', monospace;
}

.mailbox-file-zone {
    border: 1.5px dashed rgba(255, 105, 180, 0.4);
    border-radius: 10px;
    background: rgba(255, 105, 180, 0.05);
    padding: 30px 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    position: relative;
}

body:not(.dark-mode) .mailbox-file-zone {
    background: rgba(255, 105, 180, 0.08);
}

.mailbox-file-zone:hover {
    border-color: var(--accent-pink);
    background: var(--accent-pink-dim);
}

.mailbox-file-icon {
    font-size: 2.2rem;
    margin-bottom: 8px;
    display: inline-block;
    opacity: 0.8;
}

.mailbox-file-label {
    color: var(--exam-text-color);
    font-size: 1rem;
    margin: 0;
    opacity: 0.9;
}

.mailbox-file-zone input[type="file"] {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%; opacity: 0; cursor: pointer;
}

.mailbox-file-names {
    margin-top: 15px;
    font-size: 0.9rem;
    color: var(--accent-pink);
    flex-direction: column;
    gap: 4px;
    text-align: left;
    background: rgba(0,0,0,0.3);
    padding: 10px;
    border-radius: 6px;
    display: none;
}
.mailbox-file-names:not(:empty) { display: flex; }

.mailbox-send-btn {
    background: var(--accent-pink-dim);
    border: 1px solid var(--accent-pink);
    color: var(--accent-pink);
    font-family: 'JetBrains Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 2px;
    padding: 15px 40px;
    font-size: 1.15rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

.mailbox-send-btn:hover {
    background: var(--accent-pink);
    color: #fff;
    box-shadow: 0 0 20px var(--accent-pink-hover);
}

.mailbox-note {
    font-size: 0.9rem;
    color: var(--exam-text-color);
    opacity: 0.45;
    font-style: italic;
    width: 100%;
}

/* Preview LaTeX styles */
.latex-preview-wrap {
    margin-top: 8px;
    background: rgba(0,0,0,0.15);
    border: 1px solid rgba(255, 105, 180, 0.15);
    border-radius: 8px;
    overflow: hidden;
}

body:not(.dark-mode) .latex-preview-wrap {
    background: rgba(0,0,0,0.02);
    border-color: rgba(255, 105, 180, 0.15);
}

.latex-preview-toggle {
    width: 100%;
    background: var(--accent-pink-dim);
    color: var(--exam-text-color);
    border: none;
    padding: 10px 15px;
    text-align: left;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.3s;
    font-family: 'JetBrains Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.latex-preview-toggle:hover {
    background: var(--accent-pink-hover);
    color: #fff;
}

.latex-preview-box {
    display: none;
    padding: 20px;
    color: var(--exam-text-color);
    line-height: 1.85;
    font-size: 1.01rem;
    font-family: "Times New Roman", Times, serif;
    background: #fff;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
}

.latex-preview-box.active {
    display: block;
}

.latex-preview-empty {
    opacity: 0.4;
    font-style: italic;
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    color: var(--exam-text-color);
}

@media print {
    .solution-mailbox {
        display: none !important;
    }
}