feat: Redesign homepage with professional PC-98 styling (#96)

* feat: soryu-co/soryu - soryu: Redesign landing page layout and header for professional style

* feat: soryu-co/soryu - soryu: Restyle CSS for professional landing page

* feat: soryu-co/soryu - soryu: Integrate and polish landing page styles with component

1 files changed, 108 insertions, 0 deletions

diff --git a/frontend/src/styles/mobile.css b/frontend/src/styles/mobile.css
index c1c524d..7d1f282 100644
--- a/frontend/src/styles/mobile.css
+++ b/frontend/src/styles/mobile.css
@@ -51,4 +51,112 @@
   .makima-inline-icon { width: 16px; height: 16px; margin-left: 6px; }
   .makima-list { gap: 4px; }
   .makima-list li { font-size: 12px; line-height: 1.45; }
+
+  /* ================== Professional Landing Page – Mobile ================== */
+
+  /* Compact header */
+  .pro-header-content {
+    padding: 0.45rem 1rem;
+  }
+
+  .pro-company-name {
+    font-size: 0.85rem;
+    letter-spacing: 0.12em;
+  }
+
+  .pro-crane-logo {
+    height: 28px;
+  }
+
+  /* Hide center heart on small screens to save space */
+  .pro-header-center {
+    display: none;
+  }
+
+  /* Full-width nav buttons */
+  .pro-header-nav {
+    gap: 0.15rem;
+  }
+
+  .pro-nav-link {
+    font-size: 0.7rem;
+    padding: 0.3rem 0.5rem;
+  }
+
+  .pro-nav-login {
+    margin-left: 0.25rem;
+  }
+
+  /* Hero – reduce heading size and padding */
+  .pro-hero {
+    min-height: 85vh;
+    padding: 5rem 1.25rem 3rem;
+  }
+
+  .pro-hero-headline {
+    font-size: clamp(1.4rem, 5.5vw, 2rem);
+  }
+
+  .pro-hero-sub {
+    font-size: 0.9rem;
+    margin-bottom: 2rem;
+  }
+
+  .pro-hero-tagline-jp {
+    font-size: 0.75rem;
+    letter-spacing: 0.35em;
+  }
+
+  .pro-hero-cta {
+    flex-direction: column;
+    align-items: stretch;
+  }
+
+  .pro-btn-primary,
+  .pro-btn-secondary {
+    width: 100%;
+    text-align: center;
+    justify-content: center;
+  }
+
+  /* Stack cards to single column */
+  .pro-content-grid {
+    grid-template-columns: 1fr;
+    padding: 0 1rem 3rem;
+    gap: 1.5rem;
+  }
+
+  .pro-card-header {
+    padding: 1rem 1.25rem 0.6rem;
+  }
+
+  .pro-card-body {
+    padding: 0.6rem 1.25rem 1.25rem;
+  }
+
+  .pro-card-title {
+    font-size: 1rem;
+  }
+
+  .pro-card-subtitle {
+    font-size: 0.88rem;
+  }
+
+  .pro-card-text {
+    font-size: 0.8rem;
+  }
+
+  .pro-makima-logo {
+    width: 48px;
+    height: 48px;
+  }
+
+  /* Footer compact */
+  .pro-footer {
+    padding: 1.25rem 1rem;
+  }
+
+  .pro-footer-inner {
+    font-size: 0.7rem;
+  }
 }