/*
 * css/style.css
 * DSA Lab Report Generator — St. Xavier's College
 * All UI styles: layout, form panel, A4 preview, output pages, buttons, animations.
 * No dependencies on external CSS frameworks.
 */

/* ── CUSTOM PROPERTIES ───────────────────────────────────────────────────── */
:root {
  --navy:        #0f1f3d;
  --navy-mid:    #1a3260;
  --gold:        #c9962a;
  --gold-light:  #f0c84a;
  --cream:       #faf7f2;
  --cream-dark:  #f0ebe0;
  --white:       #ffffff;
  --text:        #1a1a2e;
  --text-muted:  #6b7280;
  --border:      #e2d9c8;
  --border-dark: #c9bfad;
  --success:     #16a34a;
  --shadow-sm:   0 2px 8px rgba(15,31,61,0.07);
  --shadow-md:   0 4px 20px rgba(15,31,61,0.10);
  --shadow-lg:   0 8px 32px rgba(15,31,61,0.13);
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   14px;
  --font-ui:     'DM Sans', system-ui, sans-serif;
  --font-display:'Playfair Display', Georgia, serif;
}

/* ── RESET ───────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font-ui); background: var(--cream); color: var(--text); min-height: 100vh; }
img { display: block; max-width: 100%; }
button { cursor: pointer; font-family: var(--font-ui); }
textarea, select, input { font-family: var(--font-ui); }

/* ── SITE HEADER ─────────────────────────────────────────────────────────── */
.site-header {
  background: var(--navy);
  padding: 2.25rem 1.5rem 1.75rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.site-header::before {
  content: '';
  position: absolute; inset: 0;
  background: repeating-linear-gradient(
    45deg, transparent, transparent 50px,
    rgba(201,150,42,0.035) 50px, rgba(201,150,42,0.035) 100px
  );
  pointer-events: none;
}
.site-header__inner { position: relative; z-index: 1; }
.site-header__badge {
  display: inline-block;
  background: var(--gold);
  color: var(--navy);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 0.28rem 0.85rem;
  border-radius: 2px;
  margin-bottom: 0.9rem;
}
.site-header__title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  color: var(--white);
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.site-header__accent { color: var(--gold-light); }
.site-header__sub {
  color: rgba(255,255,255,0.5);
  font-size: 0.85rem;
  margin-top: 0.5rem;
  font-weight: 300;
}

/* ── APP LAYOUT ──────────────────────────────────────────────────────────── */
.app-layout {
  display: grid;
  grid-template-columns: 310px 1fr;
  gap: 1.75rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  align-items: start;
}


/* ── FORM PANEL ──────────────────────────────────────────────────────────── */
.form-panel {
  position: sticky;
  top: 1.5rem;
}
.form-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.6rem 1.5rem;
  box-shadow: var(--shadow-md);
}
.form-card__title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--navy);
  padding-bottom: 0.7rem;
  margin-bottom: 1.3rem;
  border-bottom: 2.5px solid var(--gold);
}

/* ── FORM FIELDS ─────────────────────────────────────────────────────────── */
.field { margin-bottom: 1.1rem; }
.field__label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}
.field__hint {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.68rem;
  color: var(--gold);
}

/* Select wrapper with custom arrow */
.field__select-wrap {
  position: relative;
}
.field__select-wrap::after {
  content: '';
  position: absolute;
  right: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  width: 10px; height: 6px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%236b7280' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat;
  pointer-events: none;
}
.field__select {
  width: 100%;
  padding: 0.6rem 2rem 0.6rem 0.85rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text);
  background: var(--cream);
  appearance: none;
  -webkit-appearance: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.field__select:focus {
  outline: none;
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(201,150,42,0.15);
}

.field__textarea {
  width: 100%;
  padding: 0.6rem 0.85rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text);
  background: var(--cream);
  resize: vertical;
  min-height: 56px;
  line-height: 1.5;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.field__textarea:focus {
  outline: none;
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(201,150,42,0.15);
}
.field__textarea::placeholder { color: #aaa; font-style: italic; }

.field__input {
  width: 100%;
  padding: 0.6rem 0.85rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text);
  background: var(--cream);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.field__input:focus {
  outline: none;
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(201,150,42,0.15);
}

/* ── FORM DIVIDER ────────────────────────────────────────────────────────── */
.form-divider {
  height: 1px;
  background: var(--border);
  margin: 1.2rem 0;
}

/* ── OUTPUT CONTROLS ─────────────────────────────────────────────────────── */
.output-controls__title {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 0.3rem;
}
.output-controls__desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  line-height: 1.4;
}
.output-pages-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.6rem;
}
.output-page-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.6rem;
  background: var(--cream-dark);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--navy);
}
.output-page-chip__remove {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1;
  padding: 0;
  cursor: pointer;
  transition: color 0.15s;
}
.output-page-chip__remove:hover { color: #dc2626; }

/* ── BUTTONS ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  border: 1.5px solid transparent;
  transition: background 0.2s, border-color 0.2s, transform 0.1s, opacity 0.2s;
}
.btn:active:not(:disabled) { transform: scale(0.985); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn__icon { font-style: normal; }

.btn--primary {
  background: var(--navy);
  color: var(--white);
  margin-bottom: 0.5rem;
}
.btn--primary:hover:not(:disabled) { background: var(--navy-mid); }

.btn--secondary {
  background: var(--white);
  color: var(--navy);
  border-color: var(--border);
  margin-bottom: 0.5rem;
}
.btn--secondary:hover:not(:disabled) { background: var(--cream); }

.btn--outline {
  background: var(--white);
  color: var(--navy);
  border-color: var(--border);
  font-size: 0.85rem;
  padding: 0.55rem 0.85rem;
}
.btn--outline:hover:not(:disabled) { background: var(--cream); border-color: var(--gold); }

.download-group { display: flex; flex-direction: column; }

/* ── STATUS MESSAGE ──────────────────────────────────────────────────────── */
.status-msg {
  min-height: 1.4em;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--success);
  text-align: center;
  transition: opacity 0.3s;
}
.status-msg.hidden { opacity: 0; }

/* ── PREVIEW PANEL ───────────────────────────────────────────────────────── */
.preview-panel {
  overflow: hidden;
  min-width: 0;
}
.preview-panel__header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.preview-panel__title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--navy);
}
.preview-panel__info {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-style: italic;
}

/* Pages row — horizontal scroll so pages never shrink */
.pages-row {
  display: flex;
  flex-wrap: nowrap;
  gap: 1.25rem;
  align-items: flex-start;
  overflow-x: auto;
  padding-bottom: 0.75rem;
  /* Smooth scroll & hide ugly scrollbar on webkit */
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--border-dark) transparent;
}
.pages-row::-webkit-scrollbar { height: 6px; }
.pages-row::-webkit-scrollbar-track { background: transparent; }
.pages-row::-webkit-scrollbar-thumb { background: var(--border-dark); border-radius: 3px; }

/* ── PAGE WRAP ───────────────────────────────────────────────────────────── */
.page-wrap {
  flex: 0 0 320px;   /* fixed width — never shrinks regardless of page count */
  width: 320px;
}

/* ── PAGE LABEL ──────────────────────────────────────────────────────────── */
.page-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.45rem;
}
.page-label__dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--gold);
  flex-shrink: 0;
}

/* ── A4 SHELL + VIEWPORT ─────────────────────────────────────────────────── */
.a4-shell {
  background: #c8c4bc;
  padding: 5px;
  border-radius: 3px;
  box-shadow: 0 3px 16px rgba(0,0,0,0.2), 0 1px 4px rgba(0,0,0,0.12);
}

/* The viewport maintains A4 aspect ratio and clips overflow */
.a4-viewport {
  position: relative;
  width: 100%;
  /* A4 aspect ratio: 297/210 = 1.41428... */
  padding-top: 141.43%;
  background: #fff;
  overflow: hidden;
}

/* The inner div is 794x1123px (A4 at 96dpi), scaled via JS to fit viewport */
.a4-inner {
  position: absolute;
  top: 0; left: 0;
  width: 794px;
  height: 1123px;
  transform-origin: top left;
  /* scale set by JS */
  background: #fff;
  font-family: 'Times New Roman', Times, serif;
}

/* ── COVER PAGE ELEMENTS (inside .a4-inner, 794×1123px = A4 at 96dpi) ───── */
/*
 * 1mm = 96/25.4 = 3.7795px.  1 twip = 96/1440 = 0.06667px.
 *
 * ── LOGO ──────────────────────────────────────────────────────────────────
 * Word spec: 45.473mm × 51.206mm (1637030 × 1843405 EMU).
 * posOffset = 429260 EMU = 11.924mm below TOP of page (anchor at top margin).
 * Logo top  = margin(25.4mm) + 11.924mm = 37.324mm = 141.1px
 * Logo X    = (794 - 171.9) / 2 = 311.1px  (centered on 794px page)
 * Logo bottom = 37.324 + 51.206 = 88.530mm = 334.6px
 *
 * ── TEXT BLOCK ────────────────────────────────────────────────────────────
 * Paragraph model:  advance = spaceBefore + lineHeight + spaceAfter
 * DEPT/SUB/LAB:  240+360+240 = 840 twips = 56px per paragraph
 * TITLE:         255+600+240 = 1095 twips = 73px per paragraph
 *
 * Text block positioned at logo bottom (335px), each element uses
 * padding-top for spaceBefore and line-height for lineH.
 *
 * ── TABLE ─────────────────────────────────────────────────────────────────
 * Total width  = 179.299mm = 677.8px  → X = (794-677.8)/2 = 58.1px
 * Col1=263.7px | Col2=270.0px | Col3=144.1px
 * Header height= 10.936mm = 41.3px  →  use 41px
 * Data height  = (240+4×360) twips = 1680 twips = 112px
 * Table top    = logo_bottom + 3×56px (DEPT/SUB/LAB) + 73px (TITLE) = 335 + 241 = 576px
 * Date top     = 576 + 41 + 112 + 4px gap = 733px
 */

/* Banner: spans content width at top margin */
.cv-banner {
  position: absolute;
  top: 96px;           /* 25.4mm = 96px (top margin) */
  left: 85px;          /* left margin */
  width: 650px;        /* content width: 159.2mm = 602px */
  height: auto;
  display: block;
}

/* Logo: 171.9×193.5px, top=141px, centered at X=311px */
.cv-logo {
  position: absolute;
  top: 250px;          /* 37.324mm = 141.1px + 109.9px correction */
  left: 311px;         /* (794 - 171.9) / 2 = 311.1px */
  width: 172px;        /* 45.473mm = 171.9px */
  height: 194px;       /* 51.206mm = 193.5px */
  object-fit: contain;
}

/* Text block: starts at logo bottom (335px), flows downward.
   Each child uses padding-top for Word's spacingBefore. */
.cv-text-block {
  position: absolute;
  top: 500px;          /* logo bottom: 141 + 194 = 335px */
  left: 96px;
  right: 96px;
  text-align: center;
}

/* DEPT — 18pt (24px), spBefore=16px, lineH=24px, spAfter=16px → advance=56px */
.cv-dept {
  font-size: 24px;
  font-weight: 700;
  padding-top: 16px;
  line-height: 24px;
  padding-bottom: 16px;
}
/* SUBJECT — 16pt (21.3px), same spacing → advance=56px */
.cv-subject {
  font-size: 21px;
  font-weight: 700;
  padding-top: 16px;
  line-height: 24px;
  padding-bottom: 16px;
}
/* LABNO — 16pt (21.3px), same spacing → advance=56px */
.cv-labno {
  font-size: 21px;
  font-weight: 700;
  padding-top: 16px;
  line-height: 24px;
  padding-bottom: 16px;
}
/* TITLE — 14pt (18.7px), spBefore=17px, lineH=40px, spAfter=16px → advance=73px */
.cv-title {
  font-size: 19px;
  font-weight: 400;
  padding-top: 17px;
  line-height: 40px;
  padding-bottom: 16px;
  color: #222;
}

/* ── TABLE ────────────────────────────────────────────────────────────────
 * top = 335 (logo bottom) + 56+56+56 (3 text paras) + 73 (title) = 576px
 * X   = (794 - 678) / 2 = 58px
 * W   = 678px (179.299mm)
 * Col1=264px, Col2=270px, Col3=144px
 * Header = 41px, Data = 112px
 */
.cv-table {
  position: absolute;
  top: 780px;
  left: 58px;
  width: 678px;
  border-collapse: collapse;
  font-size: 19px;     /* 14pt */
  line-height: 24px;   /* 360 twips = 24px */
}
.cv-table__th {
  border: 1px solid #000;
  height: 41px;
  padding: 0 8px;
  font-size: 21px;     /* 16pt */
  font-weight: 700;
  text-align: left;
  vertical-align: middle;
  background: #fff;
}
.cv-table__th--sig { width: 144px; }

.cv-table__td {
  border: 1px solid #000;
  height: 112px;       /* 1680 twips = 112px */
  padding: 6px 8px;    /* ≈ 240twp top pad (16px → reduced for visual fit) */
  vertical-align: top;
}
.cv-table__td--sig { width: 144px; }

.cv-lbl { font-weight: 700; }
.cv-ph  { color: #bbb; font-style: italic; }

/* Date: centered, flush below table (1 twip ≈ 0px gap → use 4px) */
/* top = 576 + 41 + 112 + 4 = 733px */
.cv-date {
  position: absolute;
  top: 960px;
  left: 96px;
  right: 96px;
  text-align: center;
  font-size: 19px;     /* 14pt */
  font-weight: 700;
}

/* ── OUTPUT PAGE ELEMENTS ────────────────────────────────────────────────── */

/* The output viewport uses same a4-viewport / a4-inner system */
.op-inner {
  position: absolute;
  top: 0; left: 0;
  width: 794px;
  height: 1123px;
  transform-origin: top left;
  background: #fff;
  font-family: 'Times New Roman', Times, serif;
}

/* The output box fills the content area (margin = ~90px at 96dpi for 2.54cm) */
.op-box {
  position: absolute;
  top: 55px;
  left: 90px;
  right: 90px;
  bottom: 55px;
  width: calc(794px - 180px);
  height: calc(1123px - 110px);
  border: 2px solid #000;
  overflow: hidden;
  cursor: crosshair;
}

.op-label {
  position: absolute;
  top: 8px;
  left: 10px;
  font-size: 26px;
  font-weight: 700;
  pointer-events: none;
  z-index: 1;
  color: #000;
}

/* Upload overlay — shown when no images yet */
.op-upload-hint {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  pointer-events: none;
  color: #ccc;
  font-family: var(--font-ui);
  user-select: none;
}
.op-upload-hint.hidden { display: none; }
.op-upload-hint__icon  { font-size: 64px; margin-bottom: 6px; margin-top: -50px; }
.op-upload-hint__text  { font-size:20px; line-height: 1.5; }

/* Upload button (per output page) */
.op-upload-btn {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(15,31,61,0.75);
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 4px 9px;
  font-size: 20px;
  font-family: var(--font-ui);
  cursor: pointer;
  z-index: 10;
  transition: background 0.15s;
}
.op-upload-btn:hover { background: rgba(15,31,61,0.95); }

/* Hidden file input */
.op-file-input { display: none; }

/* ── DRAGGABLE IMAGE ─────────────────────────────────────────────────────── */
.op-img-wrap {
  position: absolute;
  cursor: move;
  user-select: none;
  /* top/left set by JS */
}
.op-img-wrap.selected .op-img-handles { display: block; }
.op-img-wrap img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: fill;
  pointer-events: none;
  user-select: none;
}

/* Resize handles — 4 corners */
.op-img-handles { display: none; }
.op-handle {
  position: absolute;
  width: 20px; height: 10px;
  background: var(--navy);
  border: 2px solid #fff;
  border-radius: 2px;
  z-index: 20;
}
.op-handle--tl { top: -5px;  left: -5px;  cursor: nw-resize; }
.op-handle--tr { top: -5px;  right: -5px; cursor: ne-resize; }
.op-handle--bl { bottom: -5px; left: -5px; cursor: sw-resize; }
.op-handle--br { bottom: -5px; right: -5px; cursor: se-resize; }

/* Image delete button — shown on selected image */
.op-img-delete {
  display: none;
  position: absolute;
  top: -10px;
  left: -10px;
  width: 40px;
  height: 40px;
  background: #dc2626;
  color: #fff;
  border: 2px solid #fff;
  border-radius: 50%;
  font-size: 13px;
  line-height: 1;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 25;
  padding: 0;
  box-shadow: 0 1px 4px rgba(0,0,0,0.3);
  transition: background 0.15s;
}
.op-img-delete:hover { background: #b91c1c; }
.op-img-wrap.selected .op-img-delete { display: flex; }

/* Output page remove button */
.op-remove-btn {
  position: absolute;
  top: -10px; right: -10px;
  width: 22px; height: 22px;
  background: #dc2626;
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 13px;
  line-height: 22px;
  text-align: center;
  cursor: pointer;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 4px rgba(0,0,0,0.25);
  transition: background 0.15s;
}
.op-remove-btn:hover { background: #b91c1c; }

/* ── RESPONSIVE ──────────────────────────────────────────────────────────── */
@media (max-width: 860px) {
  .app-layout {
    grid-template-columns: 1fr;
  }
  .form-panel { position: static; }
  .page-wrap {
    flex: 0 0 280px;
    width: 280px;
  }
}

@media (max-width: 480px) {
  .site-header { padding: 1.5rem 1rem 1.25rem; }
  .app-layout  { padding: 1.25rem 1rem 3rem; }
}

/* ── ANIMATIONS ──────────────────────────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}
.page-wrap { animation: fadeIn 0.25s ease both; }

/*Github logo in header*/
.landing-header-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.9rem;
  color: rgba(255,255,255,0.6);
  font-size: 0.78rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid rgba(255,255,255,0.2);
  padding: 0.3rem 0.75rem;
  border-radius: 20px;
  transition: color 0.2s, border-color 0.2s;
}
.landing-header-link:hover {
  color: var(--gold-light);
  border-color: var(--gold);
}