/* ===== RESET & BASE ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-primary: #0b0d14;
  --bg-secondary: #10131c;
  --bg-card: #161a26;
  --border-color: #242938;
  --text-primary: #e7e9f0;
  --text-secondary: #9aa1b4;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.45);
  --danger: #f87171;
  --success: #34d399;
  --radius: 14px;
  --radius-sm: 8px;
  --transition: all 0.25s ease;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container { width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 20px; }
a { color: var(--accent-light); text-decoration: none; }
h1, h2, h3 { line-height: 1.25; font-weight: 700; }

/* ===== HEADER ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11, 13, 20, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 14px 20px; }
.logo { display: flex; align-items: center; gap: 10px; }
.logo-mark { font-size: 22px; filter: drop-shadow(0 0 8px var(--accent-glow)); }
.logo-text { display: flex; flex-direction: column; line-height: 1.1; }
.logo-title { font-size: 20px; font-weight: 800; color: var(--text-primary); }
.logo-sub { font-size: 11px; color: var(--text-secondary); }
.main-nav { display: flex; gap: 18px; }
.main-nav a { color: var(--text-secondary); font-size: 14px; font-weight: 500; transition: var(--transition); }
.main-nav a:hover { color: var(--accent-light); }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 22px; border-radius: var(--radius-sm); font-size: 15px; font-weight: 600;
  border: none; cursor: pointer; transition: var(--transition); width: 100%;
}
.btn-primary { background: linear-gradient(135deg, var(--accent), #4f46e5); color: #fff; }
.btn-glow:hover { box-shadow: 0 0 22px var(--accent-glow); transform: translateY(-1px); }
.btn-secondary {
  background: var(--bg-card); color: var(--text-primary);
  border: 1px solid var(--border-color); width: auto; white-space: nowrap;
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent-light); }
.btn-full { width: 100%; margin-top: 20px; }

.back-link {
  background: none; border: none; color: var(--text-secondary);
  font-size: 13px; font-weight: 600; cursor: pointer; margin-bottom: 16px;
  padding: 0; transition: var(--transition);
}
.back-link:hover { color: var(--accent-light); }

/* ===== MODE SELECT ===== */
.mode-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 22px; }
.mode-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 26px 18px;
  display: flex; flex-direction: column; align-items: center; text-align: center; gap: 8px;
  cursor: pointer;
  transition: var(--transition);
}
.mode-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-3px);
}
.mode-icon { font-size: 32px; margin-bottom: 4px; }
.mode-title { font-size: 16px; font-weight: 700; color: var(--text-primary); }
.mode-desc { font-size: 13px; color: var(--text-secondary); }

@media (max-width: 480px) {
  .mode-grid { grid-template-columns: 1fr; }
}

/* ===== TOOL SECTION ===== */
.tool-section { padding: 60px 0 40px; }
.tool-heading { text-align: center; max-width: 700px; margin: 0 auto 36px; }
.tool-heading h1 { font-size: clamp(28px, 5vw, 42px); margin-bottom: 14px; }
.accent {
  background: linear-gradient(135deg, var(--accent-light), var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.tool-lead { color: var(--text-secondary); font-size: 16px; }

.glass-card {
  background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius);
  box-shadow: 0 0 0 1px rgba(255,255,255,0.02), 0 20px 60px rgba(0,0,0,0.35);
}
.tool-card { max-width: 620px; margin: 0 auto; padding: 32px; }
.panel-title { font-size: 20px; margin-bottom: 8px; }
.panel-sub { color: var(--text-secondary); font-size: 14px; margin-bottom: 18px; }

.field-label { display: block; font-size: 13px; font-weight: 600; color: var(--text-secondary); margin: 16px 0 6px; }
.req { color: var(--danger); }
.optional { color: var(--text-secondary); font-weight: 400; }
.field-note { font-size: 12px; color: var(--text-secondary); margin-top: 6px; }

.input-field {
  width: 100%; background: var(--bg-secondary); border: 1px solid var(--border-color);
  color: var(--text-primary); border-radius: var(--radius-sm); padding: 12px 14px;
  font-size: 14px; font-family: inherit; transition: var(--transition);
}
.input-field:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
textarea.input-field { resize: vertical; min-height: 110px; }
select.input-field { cursor: pointer; }
input[type="file"].input-field { padding: 10px 14px; cursor: pointer; }

#generateBtn, #unlockBtn { margin-top: 22px; }

.error-msg { color: var(--danger); font-size: 13px; margin-top: 12px; font-weight: 500; }
.views-note { color: var(--accent-light); font-size: 13px; margin-top: 10px; font-weight: 600; }
.compress-info { color: var(--success); font-size: 12px; margin-top: 8px; font-weight: 600; }
.link-size-note { font-size: 12px; color: var(--text-secondary); margin-top: 6px; }

.image-preview-wrap {
  margin-top: 10px; position: relative; display: inline-block;
  border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--border-color);
}
.image-preview-wrap img { display: block; max-width: 100%; max-height: 180px; }
.btn-remove-img {
  position: absolute; top: 6px; right: 6px;
  background: rgba(11,13,20,0.85); color: #fff; border: none;
  border-radius: 6px; padding: 4px 8px; font-size: 12px; cursor: pointer;
}

.reveal-image-wrap { margin-top: 14px; border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--success); }
.reveal-image-wrap img { display: block; width: 100%; max-height: 400px; object-fit: contain; background: var(--bg-secondary); }

.result-box { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--border-color); }
.result-row { display: flex; gap: 10px; }
.result-row .input-field { flex: 1; }
.result-hint { font-size: 12px; color: var(--text-secondary); margin-top: 8px; }

.hint-box {
  background: rgba(99, 102, 241, 0.1); border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-sm); padding: 12px 14px; font-size: 14px; margin-bottom: 16px;
}

.reveal-box { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--border-color); animation: fadeIn 0.4s ease; }
.reveal-text {
  background: var(--bg-secondary); border: 1px solid var(--success); border-radius: var(--radius-sm);
  padding: 16px; white-space: pre-wrap; word-break: break-word; font-size: 15px;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }

/* ===== CONTENT SECTIONS ===== */
.content-section { padding: 70px 0; }
.alt-bg { background: var(--bg-secondary); }
.section-title { font-size: clamp(24px, 4vw, 32px); text-align: center; margin-bottom: 12px; }
.section-lead { text-align: center; color: var(--text-secondary); max-width: 650px; margin: 0 auto 40px; font-size: 15px; }

.steps-grid, .security-grid, .usecase-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.step-card, .security-card, .usecase-card {
  background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius);
  padding: 24px; transition: var(--transition);
}
.step-card:hover, .security-card:hover, .usecase-card:hover {
  border-color: var(--accent); transform: translateY(-3px); box-shadow: 0 10px 30px rgba(99,102,241,0.12);
}
.step-number {
  width: 34px; height: 34px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #4f46e5); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 700; margin-bottom: 14px;
}
.step-card h3, .security-card h3, .usecase-card h3 { font-size: 16px; margin-bottom: 8px; }
.step-card p, .security-card p, .usecase-card p { color: var(--text-secondary); font-size: 14px; }

/* ===== BLOG ===== */
.blog-list { display: flex; flex-direction: column; gap: 24px; max-width: 820px; margin: 0 auto; }
.blog-post {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 28px;
}
.blog-post h3 { font-size: 19px; margin-bottom: 6px; color: var(--text-primary); }
.blog-meta { font-size: 13px; color: var(--accent-light); font-weight: 600; margin-bottom: 14px; }
.blog-post p:not(.blog-meta) { color: var(--text-secondary); font-size: 14.5px; margin-bottom: 12px; }
.blog-post p:last-child { margin-bottom: 0; }

.responsibility-note {
  max-width: 820px;
  margin: 34px auto 0;
  background: rgba(248, 113, 113, 0.08);
  border: 1px solid rgba(248, 113, 113, 0.3);
  border-radius: var(--radius);
  padding: 24px 28px;
}
.responsibility-note h3 { font-size: 16px; margin-bottom: 10px; color: var(--text-primary); }
.responsibility-note p { color: var(--text-secondary); font-size: 14px; margin-bottom: 10px; }
.responsibility-note p:last-child { margin-bottom: 0; }

/* ===== FAQ ACCORDION ===== */
.accordion { max-width: 750px; margin: 0 auto; display: flex; flex-direction: column; gap: 10px; }
.accordion-item { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-sm); overflow: hidden; }
.accordion-header {
  width: 100%; background: none; border: none; color: var(--text-primary);
  font-size: 15px; font-weight: 600; text-align: left; padding: 16px 18px;
  display: flex; align-items: center; justify-content: space-between; cursor: pointer;
}
.accordion-icon { color: var(--accent-light); font-size: 18px; transition: var(--transition); }
.accordion-item.active .accordion-icon { transform: rotate(45deg); }
.accordion-body { max-height: 0; overflow: hidden; transition: max-height 0.3s ease, padding 0.3s ease; padding: 0 18px; }
.accordion-body p { color: var(--text-secondary); font-size: 14px; padding-bottom: 0; }
.accordion-item.active .accordion-body { max-height: 320px; padding: 0 18px 18px; }

/* ===== FOUNDER (full image, NOT circular) ===== */
.founder-card { max-width: 760px; margin: 0 auto; padding: 32px; display: flex; align-items: center; gap: 28px; }
.founder-avatar {
  width: 240px; height: 300px; border-radius: var(--radius); overflow: hidden;
  border: 2px solid var(--accent); box-shadow: 0 0 24px var(--accent-glow); flex-shrink: 0;
}
.founder-avatar img { width: 100%; height: 100%; object-fit: cover; object-position: top center; display: block; }
.founder-info h3 { font-size: 20px; }
.founder-role { color: var(--accent-light); font-size: 13px; font-weight: 600; margin: 4px 0 10px; }
.founder-bio { color: var(--text-secondary); font-size: 14px; margin-bottom: 14px; }
.social-links { display: flex; gap: 16px; }
.social-links a { font-size: 13px; font-weight: 600; }
.social-links a:hover { text-decoration: underline; }

/* ===== FOOTER ===== */
.site-footer { border-top: 1px solid var(--border-color); background: var(--bg-secondary); padding: 40px 0 24px; }
.footer-inner { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 16px; }
.footer-brand p { color: var(--text-secondary); font-size: 13px; margin-top: 4px; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 18px; }
.footer-links a { color: var(--text-secondary); font-size: 13px; }
.footer-links a:hover { color: var(--accent-light); }
.footer-copy { color: var(--text-secondary); font-size: 12px; margin-top: 10px; }

/* ===== RESPONSIVE ===== */
@media (max-width: 860px) {
  .steps-grid, .security-grid, .usecase-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .main-nav { display: none; }
  .steps-grid, .security-grid, .usecase-grid { grid-template-columns: 1fr; }
  .tool-card { padding: 22px; }
  .result-row { flex-direction: column; }
  .btn-secondary { width: 100%; }
  .founder-card { flex-direction: column; text-align: center; }
  .founder-avatar { width: 100%; max-width: 280px; height: 320px; }
  .blog-post { padding: 20px; }
}