:root {
    --bg-dark: #0d1117;
    --bg-card: #161b22;
    --bg-input: #010409;
    --text-main: #e6edf3;
    --text-muted: #8b949e;
    --border: #30363d;
    --accent: #238636;
    --accent-hover: #2ea043;
    --brand: #2f81f7;
    --brand-glow: rgba(47, 129, 247, 0.15);
    --shadow: 0 4px 12px rgba(0,0,0,0.5);
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-stack);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Utilities */
.container { max-width: 800px; margin: 0 auto; padding: 20px; }
.hidden { display: none !important; }
.highlight { color: var(--brand); }
a { color: var(--brand); text-decoration: none; transition: 0.2s; }
a:hover { text-decoration: underline; }

/* Sticky Nav */
.sticky-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(13, 17, 23, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    padding: 15px 0;
}
.nav-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo { font-weight: 700; font-size: 1.2rem; color: var(--text-main); text-decoration: none; }
.nav-links a { margin-left: 20px; font-size: 0.9rem; color: var(--text-muted); }
.nav-links a:hover { color: var(--text-main); }

/* Typography */
.hero { text-align: center; margin: 40px 0; }
.hero h1 { font-size: 2.5rem; margin-bottom: 10px; letter-spacing: -0.5px; }
.intro { color: var(--text-muted); font-size: 1.1rem; max-width: 600px; margin: 0 auto; }

/* Calculator Card */
.calc-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 30px;
    box-shadow: var(--shadow);
}
.calc-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 25px; }
.calc-header h2 { font-size: 1.2rem; }

/* Form Elements */
.input-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }
@media (min-width: 600px) { .input-grid { grid-template-columns: 1fr 1fr; } }

.form-group label { display: block; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 8px; }
.input-wrapper, .select-wrapper { position: relative; }
.currency { position: absolute; left: 12px; top: 12px; color: var(--text-muted); }

input, select {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 12px 12px 12px 30px;
    border-radius: 8px;
    font-size: 1rem;
    transition: 0.2s;
}
select { padding-left: 12px; appearance: none; cursor: pointer; }
input:focus, select:focus { border-color: var(--brand); outline: none; box-shadow: 0 0 0 3px var(--brand-glow); }

/* Toggle Switch */
.toggle-wrapper { display: flex; align-items: center; gap: 10px; }
.toggle-label { font-size: 0.85rem; color: var(--text-muted); }
.switch { position: relative; display: inline-block; width: 40px; height: 22px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: var(--border); transition: .4s; border-radius: 22px; }
.slider:before { position: absolute; content: ""; height: 16px; width: 16px; left: 3px; bottom: 3px; background-color: white; transition: .4s; border-radius: 50%; }
input:checked + .slider { background-color: var(--brand); }
input:checked + .slider:before { transform: translateX(18px); }

.checkbox-group { margin-top: 20px; display: flex; align-items: center; gap: 10px; }
.checkbox-group input { width: auto; }
.checkbox-group label { font-size: 0.9rem; color: var(--text-muted); }

.btn-primary {
    width: 100%;
    margin-top: 25px;
    padding: 14px;
    background: var(--brand);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
}
.btn-primary:hover { background: #1a73e8; }



/* Results Section */
.results-section { margin-top: 30px; animation: slideUp 0.4s ease-out; }
@keyframes slideUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.kpi-grid { display: grid; grid-template-columns: 1fr; gap: 15px; margin-bottom: 20px; }
@media (min-width: 600px) { .kpi-grid { grid-template-columns: repeat(3, 1fr); } }

.kpi-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 20px;
    border-radius: 12px;
    text-align: center;
}
.kpi-card.highlight { border-color: var(--brand); background: rgba(47, 129, 247, 0.05); }
.kpi-label { display: block; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 5px; }
.kpi-value { display: block; font-size: 1.5rem; font-weight: 700; color: var(--text-main); }
.kpi-sub { display: block; font-size: 0.75rem; color: var(--brand); margin-top: 5px; }

.breakdown-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 25px;
}
.breakdown-row { display: flex; justify-content: space-between; padding: 12px 0; border-bottom: 1px solid var(--border); color: var(--text-muted); }
.breakdown-row:last-of-type { border-bottom: none; }
.breakdown-row.total { color: var(--text-main); font-weight: 700; font-size: 1.1rem; border-top: 1px solid var(--border); margin-top: 10px; }
.action-row { display: flex; justify-content: space-between; align-items: center; margin-top: 20px; }
.btn-text { background: none; border: none; color: var(--brand); cursor: pointer; font-size: 0.9rem; }
.trust-badge { font-size: 0.8rem; color: var(--accent); }

/* Next Steps */
.next-steps { margin-top: 30px; }
.next-steps h3 { font-size: 1.1rem; margin-bottom: 15px; }
.step-grid { display: grid; grid-template-columns: 1fr; gap: 15px; }
@media (min-width: 600px) { .step-grid { grid-template-columns: repeat(3, 1fr); } }

.step-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    display: block;
    transition: transform 0.2s, border-color 0.2s;
}
.step-card:hover { transform: translateY(-3px); border-color: var(--brand); text-decoration: none; }
.step-card.disabled { opacity: 0.5; cursor: default; }
.step-card.disabled:hover { transform: none; border-color: var(--border); }
.icon { font-size: 1.5rem; margin-bottom: 10px; }
.step-card h4 { color: var(--text-main); font-size: 1rem; margin-bottom: 5px; }
.step-card p { color: var(--text-muted); font-size: 0.85rem; line-height: 1.4; margin-bottom: 10px; }
.link-text { color: var(--brand); font-size: 0.85rem; font-weight: 600; }

.assumptions { margin-top: 20px; font-size: 0.8rem; color: var(--text-muted); background: rgba(255,255,255,0.03); padding: 15px; border-radius: 8px; }
.assumptions h4 { margin-bottom: 5px; color: var(--text-muted); }

/* Content Blocks & Footer */
.content-block { margin: 40px 0; padding-top: 20px; border-top: 1px solid var(--border); }
.scenario-links { display: flex; flex-wrap: wrap; gap: 15px; margin-top: 15px; }
.scenario-links a { background: var(--bg-card); padding: 8px 15px; border-radius: 20px; border: 1px solid var(--border); color: var(--text-muted); font-size: 0.9rem; }
.scenario-links a:hover { border-color: var(--brand); color: var(--brand); text-decoration: none; }
.site-footer { margin-top: 50px; padding: 30px 0; border-top: 1px solid var(--border); text-align: center; color: var(--text-muted); font-size: 0.85rem; }

/* Sticky Bar (Desktop) */
.sticky-bar{
    position: fixed;
    left: 50%;
    bottom: 20px;
    transform: translateX(-50%);
    z-index: 999;
  
    display: none;             /* hidden by default */
    justify-content: center;
  
    width: min(980px, calc(100vw - 24px));   /* <— önemli */
  }
  
  /* JS visible ekleyince görünsün */
  .sticky-bar.visible{ display: flex; }
  
  .sticky-inner{
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;  /* <— X sağa gider */
    gap: 16px;
  
    background: var(--bg-card);
    border: 1px solid var(--accent);
    box-shadow: 0 10px 15px rgba(0,0,0,0.5);
  
    padding:   10px 60px;       /* <— 10px 200px kaldırıldı */
    border-radius: 999px;
  }
  
  .sticky-text{
    flex: 1;                  /* metin alanı büyüsün */
    min-width: 10;
  }
  
  .sticky-btn{
    white-space: nowrap;
  }
  
  .sticky-close{
    margin-left: 8px;
    width: 38px;
    height: 38px;
    border-radius: 999px;
    border: none;
    background: transparent;
    color: rgba(255,255,255,.7);
    cursor: pointer;
    display: grid;
    place-items: center;
  }
  
  .sticky-close:hover{
    background: rgba(255,255,255,.08);
  }
  
  /* Mobile'da istersen kapat */
/* Mobile: show sticky bar after calculate (when .visible is added) */
@media (max-width: 820px){
  .sticky-bar{
    bottom: 10px;
    width: calc(100vw - 16px);
  }

  .sticky-inner{
    padding: 12px 12px;
    gap: 10px;
  }

  .sticky-sub{ display: none; }   /* mobilde metni kısalt */
  .sticky-btn{ padding: 10px 12px; }
}

    .sticky-bar{
      display: flex !important;            /* mobilde kesin görünsün */
      bottom: calc(10px + env(safe-area-inset-bottom));
      width: calc(100vw - 16px);
    }
    .sticky-sub{ display:none; }
  
  
  
  
  
  
@media (min-width: 768px) { .sticky-bar.visible { display: flex; animation: slideUp 0.5s; } }
.bar-content { display: flex; align-items: center; gap: 15px; font-size: 0.9rem; }
.btn-small { background: var(--accent); color: white; padding: 6px 15px; border-radius: 20px; font-size: 0.85rem; font-weight: 600; }
.btn-small:hover { background: var(--accent-hover); text-decoration: none; }
#close-bar { background: none; border: none; color: var(--text-muted); font-size: 1.2rem; cursor: pointer; }