/* ─── Design Tokens ─────────────────────────────────── */
:root {
    --cream:      #eddabc;
    --cream-dark: #d9c49e;
    --rust:       #b16448;
    --rust-dark:  #8a4a33;
    --olive:      #5b5d34;
    --olive-dark: #3f4124;
    --sand:       #f5eed9;
    --text-dark:  #2c2215;
    --text-mid:   #5a4030;
    --white:      #fffdf7;
    --font-display: 'Caveat', cursive;
    --font-body:    'Nunito', sans-serif;
    --transition:   0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --radius:       12px;
}

/* ─── Reset & Base ───────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-body);
    background:  var(--sand);
    color:       var(--text-dark);
    overflow-x:  hidden;
}

/* ─── Shared Atoms ───────────────────────────────────── */
.section-label {
    font-family:    var(--font-body);
    font-size:      0.72rem;
    font-weight:    800;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color:          var(--rust);
    display:        block;
    margin-bottom:  0.6rem;
}
.section-title {
    font-family: var(--font-display);
    font-size:   clamp(2.2rem, 4.5vw, 3.5rem);
    font-weight: 700;
    color:       var(--olive);
    line-height: 1.15;
    margin-bottom: 1rem;
}
.section-sub {
    font-size:   0.95rem;
    line-height: 1.75;
    color:       var(--text-mid);
    max-width:   620px;
}
.btn {
    display:         inline-flex;
    align-items:     center;
    gap:             0.5rem;
    font-family:     var(--font-body);
    font-weight:     800;
    font-size:       0.88rem;
    letter-spacing:  0.06em;
    text-transform:  uppercase;
    text-decoration: none;
    padding:         0.85rem 2rem;
    border-radius:   99px;
    border:          none;
    cursor:          pointer;
    transition:      transform 0.2s ease, box-shadow 0.2s ease, background var(--transition);
    width:           fit-content;
}
.btn:hover { transform: translateY(-2px); }
.btn-cream {
    background:  var(--cream);
    color:       var(--olive-dark);
    box-shadow:  0 6px 24px rgba(0,0,0,0.18);
}
.btn-cream:hover { background: var(--white); }
.btn-outline-cream {
    background:  transparent;
    color:       var(--cream);
    border:      2px solid rgba(237,218,188,0.55);
}
.btn-outline-cream:hover { background: rgba(237,218,188,0.12); border-color: var(--cream); }
.btn-outline-rust {
    background:  transparent;
    color:       var(--rust);
    border:      2px solid rgba(177,100,72,0.4);
}
.btn-outline-rust:hover { background: rgba(177,100,72,0.08); border-color: var(--rust); }

/* ─── Scroll Animations ─────────────────────────────── */
.reveal {
    opacity:    0;
    transform:  translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }

/* ─── Breadcrumb ─────────────────────────────────────── */
.breadcrumb {
    margin-top:    72px;
    background:    var(--white);
    border-bottom: 1.5px solid rgba(177,100,72,0.1);
    padding:       0.8rem 5%;
}
.breadcrumb-inner {
    max-width:   1200px;
    margin:      0 auto;
    display:     flex;
    align-items: center;
    gap:         0.5rem;
    font-size:   0.75rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color:       var(--text-mid);
}
.breadcrumb-inner a { color: var(--rust); text-decoration: none; }
.breadcrumb-inner a:hover { text-decoration: underline; }
.bc-sep { opacity: 0.4; }

/* ─── Hero ───────────────────────────────────────────── */
.patent-hero {
    background:  var(--white);
    padding:     5rem 5% 4rem;
    position:    relative;
    overflow:    hidden;
    border-bottom: 1.5px solid rgba(177,100,72,0.08);
    text-align:  center;
}
.patent-hero::before {
    content:    '';
    position:   absolute;
    right:      -120px;
    top:        -80px;
    width:      500px;
    height:     500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(177,100,72,0.07) 0%, transparent 70%);
    pointer-events: none;
}
.patent-hero::after {
    content:    '';
    position:   absolute;
    left:       -80px;
    bottom:     -60px;
    width:      320px;
    height:     320px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(91,93,52,0.06) 0%, transparent 70%);
    pointer-events: none;
}
.patent-hero-inner {
    max-width:  680px;
    margin:     0 auto;
    position:   relative;
    z-index:    1;
    display:    flex;
    flex-direction: column;
    align-items:    center;
    gap:        1.2rem;
}
.patent-hero-badge {
    display:        inline-flex;
    align-items:    center;
    gap:            0.5rem;
    font-size:      0.72rem;
    font-weight:    800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color:          var(--olive);
    background:     rgba(91,93,52,0.08);
    border:         1.5px solid rgba(91,93,52,0.18);
    padding:        0.35rem 1rem;
    border-radius:  99px;
}
.patent-hero-inner h1 {
    font-family: var(--font-display);
    font-size:   clamp(3rem, 6vw, 5rem);
    font-weight: 700;
    color:       var(--olive);
    line-height: 1.05;
}
.patent-hero-inner h1 span { color: var(--rust); }
.patent-hero-inner p {
    font-size:   1rem;
    line-height: 1.75;
    color:       var(--text-mid);
    max-width:   540px;
}

/* ─── Status Section ─────────────────────────────────── */
.patent-status-section { padding: 5rem 5%; background: var(--sand); }
.patent-status-inner { max-width: 1100px; margin: 0 auto; text-align: center; }
.patent-status-inner .section-sub { margin: 0 auto 3rem; }

.patent-card-grid {
    display:    grid;
    grid-template-columns: 1fr 1fr;
    gap:        2rem;
    text-align: left;
}
.patent-card {
    background:    var(--white);
    border-radius: 20px;
    padding:       2rem;
    box-shadow:    0 16px 40px rgba(44,34,21,0.08);
    border:        1.5px solid rgba(177,100,72,0.1);
    display:       flex;
    flex-direction: column;
    gap:           0.6rem;
}
.pc-tag {
    display:        inline-block;
    align-self:     flex-start;
    font-size:      0.68rem;
    font-weight:    800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color:          var(--cream);
    background:     var(--olive);
    padding:        0.3rem 0.8rem;
    border-radius:  99px;
    margin-bottom:  0.4rem;
}
.patent-card h3 {
    font-family: var(--font-display);
    font-size:   1.7rem;
    font-weight: 700;
    color:       var(--olive);
}
.patent-card > p {
    font-size:   0.88rem;
    line-height: 1.65;
    color:       var(--text-mid);
    margin-bottom: 0.6rem;
}
.pc-meta {
    display:        flex;
    flex-direction: column;
    gap:            0.6rem;
    background:     var(--sand);
    border-radius:  var(--radius);
    padding:        1rem 1.2rem;
    margin-bottom:  0.6rem;
}
.pc-meta-row {
    display:         flex;
    align-items:     center;
    justify-content: space-between;
    gap:             1rem;
}
.pc-meta-label {
    font-size:      0.68rem;
    font-weight:    800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color:          var(--text-mid);
}
.pc-meta-value {
    font-size:   0.85rem;
    font-weight: 700;
    color:       var(--text-dark);
    font-style:  italic;
}
.pc-status-pill {
    font-size:      0.68rem;
    font-weight:    800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color:          var(--rust-dark);
    background:     rgba(177,100,72,0.12);
    border:         1px solid rgba(177,100,72,0.25);
    padding:        0.25rem 0.7rem;
    border-radius:  99px;
}
.pc-link.disabled {
    opacity:       0.55;
    cursor:        not-allowed;
    pointer-events: none;
}
.pc-link-note {
    font-size:  0.72rem;
    color:      var(--text-mid);
    opacity:    0.65;
    font-style: italic;
    margin-top: 0.2rem;
}

/* ─── Timeline Section ───────────────────────────────── */
.patent-timeline-section {
    background: linear-gradient(140deg, var(--olive-dark) 0%, var(--olive) 100%);
    padding:    5rem 5%;
}
.patent-timeline-inner { max-width: 780px; margin: 0 auto; text-align: center; }

.pt-track {
    display:        flex;
    flex-direction: column;
    gap:            0;
    margin-top:     3rem;
    text-align:     left;
}
.pt-step {
    display:      flex;
    align-items:  flex-start;
    gap:          1.2rem;
    padding-bottom: 2.2rem;
    position:     relative;
}
.pt-step::before {
    content:    '';
    position:   absolute;
    left:       15px;
    top:        36px;
    bottom:     0;
    width:      2px;
    background: rgba(237,218,188,0.15);
}
.pt-step:last-child::before { display: none; }
.pt-step:last-child { padding-bottom: 0; }
.pt-dot {
    flex-shrink:     0;
    width:           32px;
    height:          32px;
    border-radius:   50%;
    display:         flex;
    align-items:     center;
    justify-content: center;
    font-size:       0.85rem;
    font-weight:     800;
    background:      rgba(237,218,188,0.1);
    color:           rgba(237,218,188,0.5);
    border:          2px solid rgba(237,218,188,0.2);
    z-index:         1;
}
.pt-step.done .pt-dot {
    background: var(--cream);
    color:      var(--olive-dark);
    border-color: var(--cream);
}
.pt-step.active .pt-dot {
    background: var(--rust);
    color:      var(--white);
    border-color: var(--rust);
    box-shadow: 0 0 0 5px rgba(177,100,72,0.22);
}
.pt-text h4 {
    font-size:   0.92rem;
    font-weight: 800;
    color:       var(--cream);
    margin-bottom: 0.25rem;
}
.pt-text p {
    font-size:   0.82rem;
    line-height: 1.6;
    color:       rgba(237,218,188,0.6);
}
.pt-step.active .pt-text h4 { color: #f0c080; }

/* ─── CTA Band ────────────────────────────────────────── */
.patent-cta-band {
    background: var(--rust);
    padding:    4.5rem 5%;
    text-align: center;
}
.patent-cta-inner { max-width: 600px; margin: 0 auto; }
.patent-cta-inner h2 {
    font-family: var(--font-display);
    font-size:   clamp(1.9rem, 3.5vw, 2.6rem);
    font-weight: 700;
    color:       var(--white);
    margin-bottom: 0.6rem;
}
.patent-cta-inner p {
    font-size:   0.92rem;
    color:       rgba(255,253,247,0.85);
    margin-bottom: 1.8rem;
}
.band-btns {
    display:         flex;
    gap:             1rem;
    justify-content: center;
    flex-wrap:       wrap;
}

/* ─── Footer ─────────────────────────────────────────── */
footer {
    background: var(--text-dark);
    color:      var(--cream);
    padding:    4rem 5% 2rem;
}
.footer-grid {
    display:     grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap:         3rem;
    max-width:   1200px;
    margin:      0 auto;
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(237,218,188,0.1);
}
.footer-brand .nav-logo { font-size: 2.2rem; }
.footer-brand p {
    font-size:   0.85rem;
    line-height: 1.7;
    color:       rgba(237,218,188,0.55);
    margin-top:  0.8rem;
    max-width:   280px;
}
.footer-col h4 {
    font-size:      0.72rem;
    font-weight:    800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color:          var(--rust);
    margin-bottom:  1rem;
}
.footer-col a {
    display:     block;
    margin-bottom: 0.6rem;
    font-size:   0.85rem;
    color:       rgba(237,218,188,0.55);
    text-decoration: none;
    transition:  color var(--transition);
}
.footer-col a:hover { color: var(--cream); }
.footer-bottom {
    display:         flex;
    justify-content: space-between;
    align-items:     center;
    padding-top:     2rem;
    max-width:       1200px;
    margin:          0 auto;
    font-size:       0.78rem;
    color:           rgba(237,218,188,0.35);
    flex-wrap:       wrap;
    gap:             0.5rem;
}
.social-links { display: flex; gap: 0.8rem; }
.social-links a {
    width:       36px;
    height:      36px;
    border-radius: 50%;
    background:  rgba(237,218,188,0.08);
    border:      1px solid rgba(237,218,188,0.12);
    display:     flex;
    align-items: center;
    justify-content: center;
    font-size:   0.9rem;
    text-decoration: none;
    transition:  background var(--transition);
}
.social-links a:hover { background: var(--rust); }
.nav-logo {
    font-family:     var(--font-display);
    font-size:       2rem;
    font-weight:     700;
    color:           var(--olive);
    letter-spacing:  0.01em;
    text-decoration: none;
}
.nav-logo span { color: var(--rust); }

/* ─── Responsive ─────────────────────────────────────── */
@media (max-width: 900px) {
    .patent-card-grid { grid-template-columns: 1fr; }
    .footer-grid       { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
    .patent-hero          { padding: 4rem 4% 3rem; }
    .patent-status-section,
    .patent-timeline-section,
    .patent-cta-band      { padding: 3.5rem 4%; }
    .footer-grid           { grid-template-columns: 1fr; }
}