/* --- style.css --- */
/* Reset & base */

/* --- Reset & base --- */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      background: #f8f7f4;
      font-family: 'Palatino', 'Georgia', 'Times New Roman', serif;
      color: #1e1e1e;
      line-height: 1.7;
      padding: 2rem 1rem;
    }
    .container {
      max-width: 1100px;
      margin: 0 auto;
      background: white;
      padding: 2.5rem 2.8rem;
      box-shadow: 0 2px 12px rgba(0,0,0,0.05);
      border-radius: 4px;
    }

    /* --- header --- */
    h1 {
      font-size: 2.6rem;
      font-weight: 400;
      letter-spacing: -0.5px;
      color: #1a2a3a;
      border-bottom: 3px solid #b31b1b;
      padding-bottom: 0.5rem;
      margin-bottom: 0.25rem;
      line-height: 1.2;
    }
    .subhead {
      font-size: 1.15rem;
      color: #3d3d3d;
      margin-top: 0.25rem;
      margin-bottom: 1.8rem;
      font-style: italic;
      border-left: 4px solid #b31b1b;
      padding-left: 1.2rem;
      background: #f3f2ee;
      padding: 0.8rem 1.2rem;
      border-radius: 0 4px 4px 0;
    }
    .subhead strong {
      font-style: normal;
      color: #1a2a3a;
    }

    /* --- intro / dedication --- */
    .dedication {
      background: #f0ede7;
      padding: 1.2rem 1.8rem;
      border-radius: 6px;
      margin: 1.8rem 0 2.2rem 0;
      font-size: 1.05rem;
      border-left: 6px solid #b31b1b;
    }
    .dedication a {
      color: #b31b1b;
      text-decoration: none;
      font-weight: 500;
      border-bottom: 1px dotted #b31b1b;
    }
    .dedication a:hover {
      border-bottom: 2px solid #b31b1b;
    }

    /* --- meta info / changelog teaser --- */
    .meta-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      background: #faf9f6;
      padding: 0.8rem 1.2rem;
      border-radius: 40px;
      margin-bottom: 2.2rem;
      font-size: 0.95rem;
      border: 1px solid #e0ddd6;
    }
    .meta-grid .update {
      color: #2a4a5a;
    }
    .meta-grid .email-badge {
      background: #b31b1b;
      color: white;
      padding: 0.3rem 1rem;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 500;
      letter-spacing: 0.3px;
    }
    .meta-grid .email-badge a {
      color: white;
      text-decoration: none;
    }
    .meta-grid .email-badge a:hover {
      text-decoration: underline;
    }

    /* --- problem table --- */
    .problem-list {
      margin: 2rem 0 1.5rem 0;
      width: 100%;
      border-collapse: collapse;
      font-size: 0.98rem;
    }
    .problem-list th {
      text-align: left;
      font-weight: 600;
      color: #1a2a3a;
      border-bottom: 2px solid #b31b1b;
      padding: 0.7rem 0.5rem 0.5rem 0.5rem;
      font-size: 0.9rem;
      letter-spacing: 0.5px;
      text-transform: uppercase;
    }
    .problem-list td {
      padding: 0.85rem 0.5rem;
      border-bottom: 1px solid #e8e5de;
      vertical-align: top;
    }
    .problem-list tr:last-child td {
      border-bottom: none;
    }
    .problem-list .num {
      font-weight: 600;
      color: #b31b1b;
      width: 60px;
      white-space: nowrap;
    }
    .problem-list .title {
      font-weight: 500;
      width: 30%;
    }
    .problem-list .title a {
      color: #1a2a3a;
      text-decoration: none;
      border-bottom: 1px dotted #b31b1b;
    }
    .problem-list .title a:hover {
      border-bottom: 2px solid #b31b1b;
    }
    .problem-list .summary {
      color: #2d2d2d;
      width: 50%;
    }
    .problem-list .badge {
      font-size: 0.7rem;
      background: #e8e5de;
      color: #3d3d3d;
      padding: 0.2rem 0.7rem;
      border-radius: 20px;
      white-space: nowrap;
      display: inline-block;
      letter-spacing: 0.2px;
      font-weight: 500;
    }
    .badge.open {
      background: #b31b1b20;
      color: #a01010;
      border: 1px solid #b31b1b60;
    }
    .badge.partial {
      background: #d4b48c30;
      color: #7a5a2e;
      border: 1px solid #b38b5a60;
    }
    .badge.reference {
      background: #2a4a5a20;
      color: #1a3a4a;
      border: 1px solid #2a4a5a60;
    }

    /* --- contribution banner (no forum) --- */
    .contribute-box {
      background: #f3f0ea;
      border-radius: 8px;
      padding: 1.3rem 2rem;
      margin: 2.5rem 0 1.8rem 0;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      border: 1px solid #d8d2c7;
    }
    .contribute-box .text {
      font-size: 1rem;
    }
    .contribute-box .text strong {
      color: #1a2a3a;
    }
    .contribute-box .email-btn {
      background: #b31b1b;
      color: white;
      padding: 0.5rem 1.8rem;
      border-radius: 40px;
      font-weight: 500;
      text-decoration: none;
      font-size: 0.95rem;
      border: 1px solid #b31b1b;
      transition: background 0.15s;
      white-space: nowrap;
    }
    .contribute-box .email-btn:hover {
      background: #8f1414;
      border-color: #8f1414;
    }

    /* --- changelog (compact) --- */
    .changelog {
      margin-top: 2.2rem;
      border-top: 2px solid #e0ddd6;
      padding-top: 1.5rem;
    }
    .changelog h3 {
      font-weight: 400;
      font-size: 1.2rem;
      letter-spacing: 0.5px;
      color: #1a2a3a;
      margin-bottom: 0.5rem;
    }
    .changelog table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.9rem;
    }
    .changelog td {
      padding: 0.3rem 0.5rem 0.3rem 0;
      border-bottom: 1px dashed #e0ddd6;
    }
    .changelog .date {
      color: #5a5a5a;
      width: 90px;
      font-family: monospace;
    }
    .changelog .what {
      color: #1e1e1e;
    }
    .changelog .what a {
      color: #b31b1b;
      text-decoration: none;
      border-bottom: 1px dotted #b31b1b;
    }
    .changelog .what a:hover {
      border-bottom: 2px solid #b31b1b;
    }

   /* --- fixed footer --- */
.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: #f8f7f4;        /* matches your page background */
  border-top: 1px solid #d8d2c7;
  padding: 0.8rem 2rem;
  font-size: 0.85rem;
  color: #6a6a6a;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;              /* ensures it stays above other content */
  box-shadow: 0 -2px 8px rgba(0,0,0,0.05);
}
.footer a {
  color: #6a6a6a;
  text-decoration: none;
  border-bottom: 1px dotted #b31b1b60;
  margin: 0 0.3rem;
}
.footer a:hover {
  border-bottom: 1px solid #b31b1b;
}
/* --- production notice --- */
.production-notice {
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
  background: #fcf9f0;
  border: 2px dashed #b31b1b;
  border-radius: 12px;
  padding: 1.8rem 2rem;
  margin: 2rem 0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.production-icon {
  font-size: 2.8rem;
  line-height: 1;
  margin-top: 0.2rem;
  flex-shrink: 0;
}
.production-content h3 {
  font-weight: 500;
  font-size: 1.3rem;
  color: #1a2a3a;
  margin-bottom: 0.3rem;
}
.production-content p {
  color: #3d3d3d;
  font-size: 1rem;
  margin-bottom: 0.2rem;
}
.production-content a {
  color: #b31b1b;
  text-decoration: none;
  border-bottom: 1px dotted #b31b1b;
}
.production-content a:hover {
  border-bottom: 2px solid #b31b1b;
}
.production-sub {
  font-style: italic;
  color: #5a5a5a !important;
  font-size: 0.95rem !important;
  margin-top: 0.5rem !important;
}

/* --- responsive --- */
@media (max-width: 600px) {
  .production-notice {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 1.5rem;
  }
  .production-icon {
    font-size: 2.2rem;
  }
}


/* --- Problem Box Style --- */
.problem-box {
    background: #fcfcf9;          /* A very light, warm background */
    border: 1px solid #e0ddd6;    /* A subtle border */
    border-radius: 8px;            /* Rounded corners */
    padding: 1.8rem 2rem;          /* Inner spacing */
    margin-bottom: 2rem;           /* Space between boxes */
    box-shadow: 0 2px 8px rgba(0,0,0,0.04); /* A gentle shadow for depth */
    transition: box-shadow 0.2s ease;
}

.problem-box:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.08); /* Slightly deeper shadow on hover */
}

.problem-box .problem-title {
    font-weight: 500;
    font-size: 1.2rem;
    color: #1a2a3a;
    margin-bottom: 0.5rem;
    border-bottom: 2px solid #b31b1b40; /* A subtle red underline for the title */
    padding-bottom: 0.3rem;
}

.problem-box .problem-attribution {
    font-size: 0.9rem;
    color: #6a6a6a;
    margin-top: 1rem;
    font-style: italic;
}


/* --- Status Badge (corner) --- */
.problem-box {
    position: relative;    /* Required for absolute positioning of the badge */
    /* ... existing styles ... */
}

.status-badge {
    position: absolute;
    top: -0.5rem;          /* Slight overlap outside the box */
    right: 1.5rem;         /* Position from the right edge */
    display: inline-block;
    padding: 0.15rem 1.2rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    border-radius: 20px;
    background: #e8e5de;
    color: #4a4a4a;
    border: 1px solid #d8d2c7;
    box-shadow: 0 2px 4px rgba(0,0,0,0.06);
    z-index: 10;           /* Ensure it stays above other content */
}

/* Status variants */
.status-badge.open {
    background: #b31b1b;
    color: white;
    border-color: #8f1414;
}

.status-badge.partial {
    background: #d4b48c;
    color: #3d2a1a;
    border-color: #b38b5a;
}

.status-badge.solved {
    background: #2a7a4a;
    color: white;
    border-color: #1a5a3a;
}

.status-badge.reference {
    background: #2a4a5a;
    color: white;
    border-color: #1a3a4a;
}

.status-badge.conjecture {
    background: #6a4a8a;
    color: white;
    border-color: #5a3a7a;
}


/* --- General Remarks --- */
.problem-remarks {
    background: #f4f6f8;           /* A cool, light grey-blue background */
    border-left: 4px solid #2a4a5a; /* A muted blue accent line */
    padding: 0.8rem 1.5rem;
    margin-top: 0rem;
    margin-bottom: 2rem;
    border-radius: 0 6px 6px 0;    /* Rounded on the right, sharp on the left */
    font-size: 0.95rem;
    color: #2a3a4a;
}

.problem-remarks strong {
    color: #1a2a3a;
    font-weight: 600;
}

.problem-remarks .remark-label {
    font-weight: 600;
    color: #2a4a5a;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
    display: inline-block;
    margin-right: 0.5rem;
    border-bottom: 2px solid #2a4a5a40;
}

/* --- Optional: Different remark variants --- */
.problem-remarks.note {
    background: #f4f8f4;
    border-left-color: #2a7a4a;
}

.problem-remarks.note .remark-label {
    color: #2a7a4a;
    border-bottom-color: #2a7a4a40;
}

.problem-remarks.warning {
    background: #fcf5f0;
    border-left-color: #b38b5a;
}

.problem-remarks.warning .remark-label {
    color: #b38b5a;
    border-bottom-color: #b38b5a40;
}

.problem-remarks.tip {
    background: #f0f4fa;
    border-left-color: #3a6a8a;
}

.problem-remarks.tip .remark-label {
    color: #3a6a8a;
    border-bottom-color: #3a6a8a40;
}



/* --- Conjecture Label (consistent with problem-box style) --- */
.conjecture-label {

    color: #c2185b;                /* Deep pink for good contrast and readability */
    font-weight: 600;
    letter-spacing: 0.5px;
    vertical-align: left;
}