:root {
    --primary: #FF4458; --secondary: #FD297B; --dark: #05080f; --card-bg: #161b22;
    --text-main: #ffffff; --text-muted: #8b949e; --grad: linear-gradient(262deg, #ff7854 0%, #fd267d 100%);
}
body { background: var(--dark); color: var(--text-main); font-family: -apple-system, sans-serif; margin: 0; height: 100dvh; overflow: hidden; }
.app-container { height: 100%; display: flex; flex-direction: column; position: relative; }
.card-stack { flex: 1; position: relative; padding: 15px; display: flex; align-items: center; justify-content: center; }
.card { position: absolute; width: 100%; height: 75vh; max-width: 400px; border-radius: 20px; overflow: hidden; box-shadow: 0 10px 30px rgba(0,0,0,0.5); background-size: cover; background-position: center; transition: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); }
.card-info { position: absolute; bottom: 0; width: 100%; padding: 25px 20px; background: linear-gradient(to top, rgba(0,0,0,0.9) 30%, transparent); }
.actions { display: flex; justify-content: center; gap: 15px; padding-bottom: 20px; z-index: 100; }
.btn-round { width: 60px; height: 60px; border-radius: 50%; border: 2px solid; display: flex; align-items: center; justify-content: center; font-size: 25px; cursor: pointer; background: none; transition: 0.2s; }
.btn-pass { color: #FF4458; border-color: #FF4458; }
.btn-like { background: var(--grad); color: #fff; border: none; width: 70px; height: 70px; }
.nav-bar { height: 70px; display: flex; justify-content: space-around; align-items: center; background: rgba(15,20,30,0.95); border-top: 1px solid rgba(255,255,255,0.1); }
.nav-item { color: #666; font-size: 24px; text-decoration: none; }
.nav-active { color: var(--primary); }
.chat-layout { display: flex; flex-direction: column; height: 100%; position: fixed; top: 0; width: 100%; background: var(--dark); }
.chat-body { flex: 1; overflow-y: auto; padding: 15px; display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 75%; padding: 12px; border-radius: 18px; font-size: 15px; line-height: 1.4; word-wrap: break-word; }
.msg-me { background: var(--grad); align-self: flex-end; border-bottom-right-radius: 4px; }
.msg-them { background: #262d37; align-self: flex-start; border-bottom-left-radius: 4px; }
.form-control { width: 100%; padding: 15px; background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1); color: white; border-radius: 12px; font-size: 16px; margin-bottom: 15px; display: block; }