/* ═══════════════════════════════════════
   Healtho.ai — Shared Design System
   Design 3: Blue-Green Gradient tokens
   Import this in EVERY page for consistency
   ═══════════════════════════════════════ */
:root {
    /* ━━━ BRAND COLORS ━━━ */
    --blue: #4A7EF5;
    --blue-dark: #3b6adb;
    --green: #43B581;
    --green-dark: #38a070;
    --teal: #0ea5a0;
    --grad: linear-gradient(135deg, #4A7EF5 0%, #43B581 100%);
    --grad-light: linear-gradient(135deg, rgba(74,126,245,0.08), rgba(67,181,129,0.08));
    --grad-subtle: linear-gradient(135deg, rgba(74,126,245,0.04), rgba(67,181,129,0.04));

    /* ━━━ SURFACES ━━━ */
    --bg: #ffffff;
    --bg-soft: #f5f8fc;
    --bg-muted: #eef2f7;
    --bg-page: #f0f4f8;

    /* ━━━ TEXT ━━━ */
    --text-1: #1e293b;
    --text-2: #64748b;
    --text-3: #94a3b8;
    --text-on-grad: #ffffff;

    /* ━━━ BORDERS ━━━ */
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --border-blue: rgba(74,126,245,0.2);

    /* ━━━ STATUS COLORS ━━━ */
    --red: #ef4444;
    --red-bg: rgba(239,68,68,0.06);
    --yellow: #eab308;
    --yellow-bg: rgba(234,179,8,0.06);
    --green-s: #22c55e;
    --green-bg: rgba(34,197,94,0.06);
    --blue-s: #3b82f6;
    --blue-bg: rgba(59,130,246,0.06);

    /* ━━━ TYPOGRAPHY ━━━ */
    --font: 'Inter','Noto Sans Thai',-apple-system,BlinkMacSystemFont,sans-serif;

    /* ━━━ SPACING / RADIUS ━━━ */
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;
    --radius-full: 100px;

    /* ━━━ SHADOWS ━━━ */
    --shadow: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
    --shadow-xl: 0 16px 40px rgba(0,0,0,0.1);

    /* ━━━ TRANSITIONS ━━━ */
    --ease: 0.3s cubic-bezier(0.4,0,0.2,1);
    --ease-fast: 0.15s ease;
}

/* ━━━ DARK MODE ━━━ */
html.dark {
    --bg: #0f172a;
    --bg-soft: #1e293b;
    --bg-muted: #334155;
    --bg-page: #0c1322;
    --bg-1: #1e293b;
    --bg-2: #0f172a;

    --text-1: #f1f5f9;
    --text-2: #94a3b8;
    --text-3: #64748b;

    --border: #334155;
    --border-light: #1e293b;
    --border-blue: rgba(74,126,245,0.3);

    --red-bg: rgba(239,68,68,0.12);
    --yellow-bg: rgba(234,179,8,0.12);
    --green-bg: rgba(34,197,94,0.12);
    --blue-bg: rgba(59,130,246,0.12);

    --shadow: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.4);

    --grad-light: linear-gradient(135deg, rgba(74,126,245,0.15), rgba(67,181,129,0.15));
    --grad-subtle: linear-gradient(135deg, rgba(74,126,245,0.08), rgba(67,181,129,0.08));
}

html.dark body {
    background: var(--bg);
}

html.dark .navbar {
    background: rgba(15,23,42,.9);
}

html.dark .loading-overlay {
    background: rgba(15,23,42,0.9);
}

html.dark .form-input {
    background: var(--bg-soft);
    color: var(--text-1);
    border-color: var(--border);
}

html.dark .card {
    background: var(--bg-soft);
}

/* ━━━ RESET ━━━ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
body{font-family:var(--font);background:var(--bg);color:var(--text-1);line-height:1.7;overflow-x:hidden}
a{text-decoration:none;color:inherit}
ul,ol{list-style:none}
img{max-width:100%;height:auto}
button,input,select,textarea{font-family:var(--font)}

/* ━━━ LAYOUT ━━━ */
.container{max-width:1140px;margin:0 auto;padding:0 24px}
.container-sm{max-width:600px;margin:0 auto;padding:0 24px}
.container-md{max-width:800px;margin:0 auto;padding:0 24px}

/* ━━━ BUTTONS ━━━ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;font-size:14px;font-weight:600;border-radius:var(--radius-sm);border:none;cursor:pointer;transition:var(--ease);font-family:var(--font);line-height:1.4}
.btn:disabled{opacity:0.5;cursor:not-allowed}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 2px 8px rgba(74,126,245,0.2)}
.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 20px rgba(74,126,245,0.3)}
.btn-secondary{background:var(--bg-soft);color:var(--text-1);border:1px solid var(--border)}
.btn-secondary:hover:not(:disabled){border-color:var(--blue);color:var(--blue)}
.btn-ghost{background:transparent;color:var(--text-2);padding:12px 16px}
.btn-ghost:hover{color:var(--blue)}
.btn-danger{background:var(--red);color:#fff}
.btn-danger:hover:not(:disabled){opacity:0.9}
.btn-sm{padding:8px 16px;font-size:13px;border-radius:var(--radius-xs)}
.btn-lg{padding:16px 32px;font-size:16px;border-radius:12px}
.btn-full{width:100%}
.btn-icon{width:40px;height:40px;padding:0;border-radius:var(--radius-sm)}
.btn-white{background:#fff;color:var(--blue);box-shadow:var(--shadow-md)}
.btn-white:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}

/* ━━━ PILL / BADGE ━━━ */
.pill{display:inline-block;padding:4px 12px;background:var(--grad-light);border:1px solid var(--border-blue);border-radius:var(--radius-full);font-size:12px;font-weight:600;color:var(--blue)}
.badge{display:inline-block;padding:2px 8px;border-radius:var(--radius-xs);font-size:11px;font-weight:700}
.badge-green{background:var(--green-bg);color:var(--green-s)}
.badge-red{background:var(--red-bg);color:var(--red)}
.badge-yellow{background:var(--yellow-bg);color:var(--yellow)}
.badge-blue{background:var(--blue-bg);color:var(--blue-s)}

/* ━━━ FORM ━━━ */
.form-group{margin-bottom:20px}
.form-label{display:block;font-size:13px;font-weight:600;color:var(--text-1);margin-bottom:6px}
.form-input{width:100%;padding:12px 16px;font-size:14px;background:var(--bg);color:var(--text-1);border:1.5px solid var(--border);border-radius:var(--radius-sm);transition:var(--ease);outline:none;font-family:var(--font)}
.form-input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(74,126,245,0.1)}
.form-input::placeholder{color:var(--text-3)}
.form-input.error{border-color:var(--red)}
.form-helper{font-size:12px;color:var(--text-3);margin-top:4px}
.form-error{font-size:12px;color:var(--red);margin-top:4px}
textarea.form-input{resize:vertical;min-height:100px}
select.form-input{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12' fill='none'%3E%3Cpath d='M3 4.5L6 7.5L9 4.5' stroke='%2394a3b8' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px}

/* ━━━ CARD ━━━ */
.card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:var(--ease)}
.card-sm{padding:16px;border-radius:var(--radius-sm)}
.card-hover:hover{box-shadow:var(--shadow-md);transform:translateY(-2px);border-color:var(--blue)}
.card-grad{background:var(--grad-light);border-color:var(--border-blue)}

/* ━━━ SHARED NAV ━━━ */
.navbar{position:fixed;top:0;left:0;right:0;z-index:1000;padding:14px 0;background:rgba(255,255,255,.85);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid transparent;transition:var(--ease)}
.navbar.scrolled{padding:10px 0;border-bottom-color:var(--border);box-shadow:var(--shadow)}
.navbar .container{display:flex;align-items:center;justify-content:space-between}
.nav-logo{font-size:22px;font-weight:800;color:var(--text-1);display:flex;align-items:center;gap:4px}
.nav-logo span{background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.nav-links{display:flex;gap:28px}
.nav-links a{font-size:14px;font-weight:500;color:var(--text-2);transition:var(--ease)}
.nav-links a:hover,.nav-links a.active{color:var(--blue)}
.nav-actions{display:flex;align-items:center;gap:10px}
.btn-login{font-size:14px;color:var(--text-2);padding:8px 14px;transition:var(--ease)}
.btn-login:hover{color:var(--blue)}
.btn-cta{font-size:14px;font-weight:600;padding:10px 20px;background:var(--grad);color:#fff;border-radius:var(--radius-sm);transition:var(--ease)}
.btn-cta:hover{transform:translateY(-2px);box-shadow:0 4px 16px rgba(74,126,245,.3)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.nav-toggle span{width:22px;height:2px;background:var(--text-1);border-radius:2px;transition:var(--ease)}

/* ━━━ APP SIDEBAR NAV (for logged-in pages) ━━━ */
.app-layout{display:flex;min-height:100vh;padding-top:64px}
.sidebar{width:260px;background:var(--bg);border-right:1px solid var(--border);padding:20px 0;position:fixed;top:64px;bottom:0;overflow-y:auto;z-index:100}
.sidebar-user{padding:16px 20px;border-bottom:1px solid var(--border);margin-bottom:8px}
.sidebar-avatar{width:40px;height:40px;background:var(--grad);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:16px;margin-bottom:8px}
.sidebar-name{font-size:14px;font-weight:600}
.sidebar-email{font-size:12px;color:var(--text-3)}
.sidebar-nav{padding:0 8px}
.sidebar-link{display:flex;align-items:center;gap:12px;padding:10px 16px;font-size:14px;color:var(--text-2);border-radius:var(--radius-sm);transition:var(--ease);margin-bottom:2px;cursor:pointer}
.sidebar-link:hover{background:var(--bg-soft);color:var(--text-1)}
.sidebar-link.active{background:var(--grad-light);color:var(--blue);font-weight:600}
.sidebar-link i,.sidebar-link svg{width:18px;height:18px;flex-shrink:0}
.sidebar-divider{height:1px;background:var(--border);margin:12px 16px}
.sidebar-section{padding:8px 20px 4px;font-size:11px;font-weight:700;color:var(--text-3);text-transform:uppercase;letter-spacing:0.5px}
.app-main{flex:1;margin-left:260px;padding:24px;background:var(--bg-page)}
.app-main-full{flex:1;padding:24px;background:var(--bg-page)}

/* ━━━ PAGE HEADER ━━━ */
.page-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;gap:16px;flex-wrap:wrap}
.page-title{font-size:24px;font-weight:800}
.page-subtitle{font-size:14px;color:var(--text-2);margin-top:4px}

/* ━━━ ALERTS / TOAST ━━━ */
.alert{padding:14px 18px;border-radius:var(--radius-sm);font-size:13px;display:flex;align-items:center;gap:10px;margin-bottom:16px}
.alert-info{background:var(--blue-bg);color:var(--blue-s);border:1px solid rgba(59,130,246,0.15)}
.alert-success{background:var(--green-bg);color:var(--green-s);border:1px solid rgba(34,197,94,0.15)}
.alert-warning{background:var(--yellow-bg);color:var(--yellow);border:1px solid rgba(234,179,8,0.15)}
.alert-danger{background:var(--red-bg);color:var(--red);border:1px solid rgba(239,68,68,0.15)}

.toast{position:fixed;bottom:24px;right:24px;padding:14px 20px;border-radius:var(--radius-sm);font-size:13px;font-weight:500;color:#fff;box-shadow:var(--shadow-lg);z-index:9999;transform:translateY(100px);opacity:0;transition:var(--ease);pointer-events:none}
.toast.show{transform:translateY(0);opacity:1;pointer-events:auto}
.toast-success{background:var(--green-s)}
.toast-error{background:var(--red)}
.toast-info{background:var(--blue)}

/* ━━━ LOADING ━━━ */
.spinner{width:24px;height:24px;border:3px solid var(--border);border-top-color:var(--blue);border-radius:50%;animation:spin 0.6s linear infinite;display:inline-block}
@keyframes spin{to{transform:rotate(360deg)}}
.loading-overlay{position:fixed;inset:0;background:rgba(255,255,255,0.85);display:flex;align-items:center;justify-content:center;z-index:9998;backdrop-filter:blur(4px)}

/* ━━━ EMPTY STATE ━━━ */
.empty-state{text-align:center;padding:60px 20px}
.empty-icon{font-size:48px;margin-bottom:16px}
.empty-title{font-size:18px;font-weight:700;margin-bottom:8px}
.empty-desc{font-size:14px;color:var(--text-2);margin-bottom:20px;max-width:400px;margin-left:auto;margin-right:auto}

/* ━━━ RESPONSIVE ━━━ */
@media(max-width:1024px){
    .sidebar{display:none}
    .app-main{margin-left:0}
}
@media(max-width:768px){
    .nav-links,.nav-actions{display:none}
    .nav-toggle{display:flex}
    .nav-links.open{display:flex;flex-direction:column;position:absolute;top:100%;left:0;right:0;background:rgba(255,255,255,.97);backdrop-filter:blur(20px);padding:20px 24px;gap:14px;border-bottom:1px solid var(--border)}
    .page-header{flex-direction:column;align-items:flex-start}
}