/* Reset simples */
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body, .page-body { height: 100%; font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial; background: #f6f7fb; color: #222; }

/* Container */
.container {
    max-width: 1100px;
    margin: 48px auto;
    padding: 0 20px;
}

/* Header */
.site-header {
    text-align: center;
    margin-bottom: 36px;
}
.site-title {
    font-size: 34px;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 6px;
}
.site-subtitle {
    color: #6b7280;
    font-size: 15px;
}

/* Grid */
.messages-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 22px;
}

/* Responsive grid */
@media (min-width: 720px) {
    .messages-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1100px) {
    .messages-grid { grid-template-columns: repeat(3, 1fr); }
}

/* Card */
.message-card {
    background: #ffffff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 6px 18px rgba(33, 33, 33, 0.06);
    cursor: pointer;
    transition: transform 220ms ease, box-shadow 220ms ease;
    display: flex;
    align-items: stretch;
    min-height: 160px;
}
.message-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(18, 38, 63, 0.10);
}
.card-inner {
    padding: 18px;
    width: 100%;
    display: flex;
    flex-direction: column;
}

/* Card header */
.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}
.avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #e6eefc;
    flex-shrink: 0;
}
.avatar.large { width: 80px; height: 80px; border-radius: 50%; }
.avatar .avatar-icon { width: 20px; height: 20px; stroke-width: 1.6; }

/* Color variants via data attribute */
.avatar[data-color="red"]    { background: #fff1f2; color: #ef4444; }
.avatar[data-color="green"]  { background: #ecfdf5; color: #10b981; }
.avatar[data-color="blue"]   { background: #eff6ff; color: #3b82f6; }
.avatar[data-color="yellow"] { background: #fffbeb; color: #f59e0b; }
.avatar[data-color="purple"] { background: #f5f3ff; color: #8b5cf6; }
.avatar[data-color="indigo"] { background: #eef2ff; color: #6366f1; }
.avatar[data-color="pink"]   { background: #fff1f2; color: #ec4899; }
.avatar[data-color="teal"]   { background: #f0fdfa; color: #14b8a6; }
.avatar[data-color="orange"] { background: #fff7ed; color: #f97316; }
.avatar[data-color="cyan"]   { background: #ecfeff; color: #06b6d4; }

/* Meta */
.meta .from-name {
    font-weight: 600;
    font-size: 15px;
    color: #111827;
}
.meta .grade {
    font-size: 13px;
    color: #6b7280;
    margin-top: 2px;
}

/* Message preview (line-clamp 3) */
.message-preview {
    color: #374151;
    margin: 6px 0 10px 0;
    font-size: 15px;
    line-height: 1.45;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Card footer */
.card-footer {
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-top: 12px;
}
.card-footer .to { font-size: 13px; color: #6b7280; }
.card-footer .date { font-size: 12px; color: #9aa0a6; }

/* Slider / modal */
.slider-container {
    display: none; /* shown via JS */
    position: fixed;
    inset: 0;
    background: rgba(9, 10, 10, 0.6);
    z-index: 1200;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.slider-content {
    width: 92%;
    max-width: 820px;
    background: #ffffff;
    border-radius: 12px;
    padding: 26px;
    box-shadow: 0 30px 80px rgba(2,6,23,0.35);
    position: relative;
    transform-origin: center;
    animation: popIn 160ms ease;
}
@keyframes popIn {
    from { transform: translateY(6px) scale(.99); opacity: 0; }
    to { transform: translateY(0) scale(1); opacity: 1; }
}

.close-slider {
    position: absolute;
    top: 14px;
    right: 14px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
}
.close-slider .icon-sm { width: 18px; height: 18px; }

/* Slider content layout */
.slider-header {
    display: flex;
    gap: 16px;
    align-items: center;
    margin-bottom: 14px;
}
.slider-meta h2 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 4px;
}
.slider-meta .grade { color: #6b7280; font-size: 14px; }

/* Body */
.slider-body {
    background: #fbfdff;
    padding: 18px;
    border-radius: 8px;
    margin-top: 6px;
}
.full-message {
    color: #1f2937;
    font-size: 16px;
    line-height: 1.6;
}

/* Counter */
.slider-counter {
    text-align: center;
    color: #6b7280;
    margin-top: 10px;
    font-size: 13px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    background: #111827;
    color: #fff;
    transition: transform 120ms ease, opacity 120ms ease;
}
.btn:active { transform: translateY(1px); }
.btn-secondary {
    background: #edf2f7;
    color: #111827;
    box-shadow: none;
}

/* Slider controls row */
.slider-controls {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    margin-top: 18px;
}

/* Error */
.error {
    padding: 20px;
    text-align: center;
    background: #fff7f7;
    color: #b91c1c;
    border-radius: 8px;
}

/* Accessibility helpers */
[aria-hidden="true"] { pointer-events: none; }

/* Small screens tweaks */
@media (max-width: 420px) {
    .site-title { font-size: 22px; }
    .avatar { width: 42px; height: 42px; }
    .message-preview { font-size: 14px; }
}