@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
    --wave-primary: #6366f1;
    --wave-primary-dark: #4f46e5;
    --wave-primary-light: #eef2ff;
    --wave-accent: #06b6d4;
    --wave-accent-soft: #ecfeff;
    --wave-success: #10b981;
    --wave-warning: #f59e0b;
    --wave-danger: #ef4444;
    --wave-bg: #f1f5f9;
    --wave-bg-mesh: radial-gradient(ellipse 80% 60% at 10% -10%, rgba(99, 102, 241, 0.12), transparent),
        radial-gradient(ellipse 60% 50% at 90% 0%, rgba(6, 182, 212, 0.1), transparent),
        #f1f5f9;
    --wave-surface: #ffffff;
    --wave-surface-2: #f8fafc;
    --wave-text: #0f172a;
    --wave-text-secondary: #334155;
    --wave-muted: #64748b;
    --wave-border: #e2e8f0;
    --wave-border-light: #f1f5f9;
    --wave-radius: 20px;
    --wave-radius-md: 16px;
    --wave-radius-sm: 12px;
    --wave-shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
    --wave-shadow: 0 4px 24px rgba(15, 23, 42, 0.06);
    --wave-shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.1);
    --wave-shadow-primary: 0 8px 28px rgba(99, 102, 241, 0.35);
    --wave-header-h: 64px;
    --wave-sidebar-w: 280px;
    --wave-bottom-nav-h: 72px;
    --wave-safe-top: env(safe-area-inset-top, 0px);
    --wave-safe-bottom: env(safe-area-inset-bottom, 0px);
    --wave-content-max: 1280px;
    --wave-shell-max: 1680px;
    --wave-transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--wave-bg-mesh);
    background-attachment: fixed;
    color: var(--wave-text);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: var(--wave-primary); text-decoration: none; transition: color var(--wave-transition); }
a:hover { color: var(--wave-primary-dark); }

img { max-width: 100%; height: auto; display: block; }

/* ---- Buttons ---- */
.wave-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 48px;
    padding: 0 24px;
    border: none;
    border-radius: var(--wave-radius-sm);
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--wave-transition), box-shadow var(--wave-transition), background var(--wave-transition);
}

.wave-btn:active { transform: scale(0.98); }

.wave-btn-primary {
    background: linear-gradient(135deg, var(--wave-primary) 0%, var(--wave-primary-dark) 100%);
    color: #fff;
    box-shadow: var(--wave-shadow-primary);
}

.wave-btn-primary:hover {
    box-shadow: 0 12px 32px rgba(99, 102, 241, 0.45);
    color: #fff;
}

.wave-btn-secondary {
    background: var(--wave-surface);
    color: var(--wave-text);
    border: 1px solid var(--wave-border);
    box-shadow: var(--wave-shadow-xs);
}

.wave-btn-secondary:hover { background: var(--wave-surface-2); }

.wave-btn-block { width: 100%; }

.wave-btn-link {
    background: none;
    border: none;
    color: var(--wave-primary);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    padding: 10px 0;
    min-height: 48px;
    font-family: inherit;
}

.wave-btn-link:hover { color: var(--wave-primary-dark); }

/* ---- Forms ---- */
.wave-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}

.wave-field span {
    font-size: 0.8125rem;
    color: var(--wave-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.wave-field input,
.wave-field select,
.wave-field textarea {
    min-height: 52px;
    padding: 14px 18px;
    border: 1.5px solid var(--wave-border);
    border-radius: var(--wave-radius-sm);
    font-family: inherit;
    font-size: 1rem;
    color: var(--wave-text);
    background: var(--wave-surface);
    transition: border-color var(--wave-transition), box-shadow var(--wave-transition);
}

.wave-field input:focus,
.wave-field select:focus,
.wave-field textarea:focus {
    outline: none;
    border-color: var(--wave-primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.12);
}

.wave-field textarea { min-height: 120px; resize: vertical; line-height: 1.5; }
.wave-field small { font-size: 0.8125rem; color: var(--wave-muted); line-height: 1.4; }

/* ---- Alerts & hints ---- */
.wave-alert {
    padding: 16px 20px;
    border-radius: var(--wave-radius-sm);
    margin-bottom: 20px;
    display: flex;
    gap: 12px;
    align-items: flex-start;
    font-size: 0.9375rem;
    font-weight: 500;
}

.wave-alert i { margin-top: 2px; flex-shrink: 0; }
.wave-alert-error { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }
.wave-alert-success { background: #ecfdf5; color: #047857; border: 1px solid #a7f3d0; }

.wave-empty {
    color: var(--wave-muted);
    text-align: center;
    padding: 48px 24px;
    font-size: 0.9375rem;
}

.wave-muted { color: var(--wave-muted); font-size: 0.875rem; }

.wave-hint {
    background: linear-gradient(135deg, var(--wave-primary-light) 0%, var(--wave-accent-soft) 100%);
    padding: 16px 20px;
    border-radius: var(--wave-radius-md);
    margin-bottom: 24px;
    font-size: 0.9375rem;
    color: var(--wave-text-secondary);
    border: 1px solid rgba(99, 102, 241, 0.15);
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.wave-hint i { color: var(--wave-primary); font-size: 1.125rem; margin-top: 2px; }

/* ---- Floating save ---- */
.wave-btn-floating {
    position: fixed;
    right: max(20px, env(safe-area-inset-right));
    bottom: calc(24px + var(--wave-bottom-nav-h) + var(--wave-safe-bottom));
    z-index: 100;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 56px;
    padding: 0 28px;
    border: none;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--wave-primary), var(--wave-primary-dark));
    color: #fff;
    font-family: inherit;
    font-weight: 700;
    font-size: 0.9375rem;
    box-shadow: var(--wave-shadow-primary);
    cursor: pointer;
    transition: transform var(--wave-transition), box-shadow var(--wave-transition);
}

.wave-btn-floating:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 36px rgba(99, 102, 241, 0.45);
}

@media (min-width: 992px) {
    .wave-btn-floating { bottom: 32px; }
}

/* ---- Back to top ---- */
.wave-back-top {
    position: fixed;
    right: max(20px, env(safe-area-inset-right));
    bottom: calc(100px + var(--wave-bottom-nav-h) + var(--wave-safe-bottom));
    width: 48px;
    height: 48px;
    border: 1px solid var(--wave-border);
    border-radius: 50%;
    background: var(--wave-surface);
    box-shadow: var(--wave-shadow);
    color: var(--wave-primary);
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 99;
    transition: transform var(--wave-transition), box-shadow var(--wave-transition);
}

.wave-back-top:hover { transform: translateY(-2px); box-shadow: var(--wave-shadow-lg); }
.wave-back-top.visible { display: flex; }

@media (min-width: 992px) {
    .wave-back-top { bottom: 32px; }
    .mobile-only { display: none !important; }
}

@media (max-width: 991px) {
    .desktop-only { display: none !important; }
}

@media (max-width: 575px) {
    .wave-btn-floating span { display: none; }
    .wave-btn-floating { width: 56px; height: 56px; padding: 0; border-radius: 50%; justify-content: center; }
}