/* style.css — Easy-Ark Invest Design System */

/* ============================================
   FONT LOADING
   Using DM Sans from Google Fonts — clean, professional, geometric
   ============================================ */

/* ============================================
   TYPE SCALE — Fluid with clamp()
   ============================================ */
:root {
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.9rem  + 0.5vw,  1.125rem);
  --text-lg:   clamp(1.125rem, 0.95rem + 0.85vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1rem    + 1.5vw,  2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* Font families */
  --font-body: 'DM Sans', 'Helvetica Neue', sans-serif;
  --font-display: 'DM Sans', 'Helvetica Neue', sans-serif;
}

/* ============================================
   4px SPACING SYSTEM
   ============================================ */
:root {
  --space-1:  0.25rem;   /*  4px */
  --space-2:  0.5rem;    /*  8px */
  --space-3:  0.75rem;   /* 12px */
  --space-4:  1rem;      /* 16px */
  --space-5:  1.25rem;   /* 20px */
  --space-6:  1.5rem;    /* 24px */
  --space-8:  2rem;      /* 32px */
  --space-10: 2.5rem;    /* 40px */
  --space-12: 3rem;      /* 48px */
  --space-16: 4rem;      /* 64px */
  --space-20: 5rem;      /* 80px */
  --space-24: 6rem;      /* 96px */
  --space-32: 8rem;      /* 128px */
}

/* ============================================
   COLOR PALETTE — Finance-appropriate custom palette
   Deep navy primary, warm off-white surfaces, subtle gold accent
   ============================================ */

:root, [data-theme="light"] {
  /* Surfaces — warm off-white progression */
  --color-bg:             #f8f7f4;
  --color-surface:        #faf9f7;
  --color-surface-2:      #ffffff;
  --color-surface-offset: #f2f0ec;
  --color-surface-offset-2: #eceae5;
  --color-surface-dynamic: #e5e3de;
  --color-divider:        #dbd8d2;
  --color-border:         #d0cdc6;

  /* Text — near-black to medium gray */
  --color-text:           #1a1a1a;
  --color-text-muted:     #6b6b6b;
  --color-text-faint:     #a8a8a4;
  --color-text-inverse:   #f8f7f4;

  /* Primary Accent — Deep Navy Blue */
  --color-primary:        #1a3a5c;
  --color-primary-hover:  #142e4a;
  --color-primary-active: #0e2338;
  --color-primary-highlight: #dbe4ed;

  /* Secondary Accent — Subtle Gold (very sparingly) */
  --color-gold:           #b8860b;
  --color-gold-hover:     #9a7009;
  --color-gold-active:    #7c5a07;

  /* Semantic — muted, finance-appropriate */
  --color-error:          #9b2c2c;
  --color-error-hover:    #822424;
  --color-error-highlight: #f0dede;

  --color-success:        #276749;
  --color-success-hover:  #1e5239;
  --color-success-highlight: #ddeee5;

  --color-warning:        #8b6914;
  --color-warning-hover:  #6f5410;
  --color-warning-highlight: #f0e8d4;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows — warm-tinted */
  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 80 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.01 80 / 0.12);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;
}

/* DARK MODE */
[data-theme="dark"] {
  --color-bg:             #0f1419;
  --color-surface:        #141a21;
  --color-surface-2:      #1a2129;
  --color-surface-offset: #161d25;
  --color-surface-offset-2: #1e2630;
  --color-surface-dynamic: #252e38;
  --color-divider:        #1e2630;
  --color-border:         #2d3847;

  --color-text:           #d4d8dc;
  --color-text-muted:     #8a9199;
  --color-text-faint:     #5a6370;
  --color-text-inverse:   #0f1419;

  --color-primary:        #6a9cc8;
  --color-primary-hover:  #5388b8;
  --color-primary-active: #3d74a5;
  --color-primary-highlight: #1e2d3e;

  --color-gold:           #d4a84b;
  --color-gold-hover:     #c49838;
  --color-gold-active:    #b08825;

  --color-error:          #e07070;
  --color-error-hover:    #d05050;
  --color-error-highlight: #3a2020;

  --color-success:        #5daa7e;
  --color-success-hover:  #4d9a6e;
  --color-success-highlight: #1a3028;

  --color-warning:        #d4a84b;
  --color-warning-hover:  #c49838;
  --color-warning-highlight: #302810;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
}

/* System preference fallback */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #0f1419;
    --color-surface:        #141a21;
    --color-surface-2:      #1a2129;
    --color-surface-offset: #161d25;
    --color-surface-offset-2: #1e2630;
    --color-surface-dynamic: #252e38;
    --color-divider:        #1e2630;
    --color-border:         #2d3847;
    --color-text:           #d4d8dc;
    --color-text-muted:     #8a9199;
    --color-text-faint:     #5a6370;
    --color-text-inverse:   #0f1419;
    --color-primary:        #6a9cc8;
    --color-primary-hover:  #5388b8;
    --color-primary-active: #3d74a5;
    --color-primary-highlight: #1e2d3e;
    --color-gold:           #d4a84b;
    --color-gold-hover:     #c49838;
    --color-gold-active:    #b08825;
    --color-error:          #e07070;
    --color-error-hover:    #d05050;
    --color-error-highlight: #3a2020;
    --color-success:        #5daa7e;
    --color-success-hover:  #4d9a6e;
    --color-success-highlight: #1a3028;
    --color-warning:        #d4a84b;
    --color-warning-hover:  #c49838;
    --color-warning-highlight: #302810;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
    --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
    --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
  }
}

/* ============================================
   GLOBAL COMPONENT STYLES
   ============================================ */

/* Container */
.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.container--narrow {
  max-width: var(--content-default);
}

/* Section spacing */
.section {
  padding-block: clamp(var(--space-10), 6vw, var(--space-24));
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.08);
  transition: box-shadow var(--transition-interactive);
}

.header--scrolled {
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
}

.header__logo svg {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.header__logo-text {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.header__nav-link {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color var(--transition-interactive);
  padding: var(--space-1) 0;
}

.header__nav-link:hover {
  color: var(--color-primary);
}

.header__nav-link--active {
  color: var(--color-text);
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}

.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

/* Mobile nav toggle */
.header__mobile-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
}

@media (max-width: 767px) {
  .header__nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-4);
    gap: var(--space-2);
    box-shadow: var(--shadow-md);
  }

  .header__nav--open {
    display: flex;
  }

  .header__nav-link {
    font-size: var(--text-sm);
    padding: var(--space-2) var(--space-3);
    width: 100%;
    border-radius: var(--radius-md);
  }

  .header__nav-link:hover {
    background: var(--color-surface-offset);
  }

  .header__mobile-toggle {
    display: flex;
  }

  .header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
  }
}

/* Footer */
.footer {
  background: var(--color-surface);
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.08);
  padding-block: var(--space-10) var(--space-6);
}

.footer__inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.footer__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-divider);
}

@media (min-width: 768px) {
  .footer__top {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__brand-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
  text-decoration: none;
}

.footer__brand-logo svg {
  width: 28px;
  height: 28px;
}

.footer__brand-name {
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
}

.footer__brand-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 40ch;
}

.footer__col-title {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.footer__link {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  padding-block: var(--space-1);
  transition: color var(--transition-interactive);
}

.footer__link:hover {
  color: var(--color-primary);
}

.footer__bottom {
  padding-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.footer__disclaimer {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  line-height: 1.7;
  max-width: 90ch;
}

.footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer__meta a {
  color: var(--color-text-faint);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

.footer__meta a:hover {
  color: var(--color-primary);
}

/* Gold accent line */
.gold-accent {
  width: 40px;
  height: 2px;
  background: var(--color-gold);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-interactive);
  min-height: 44px;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
}

.btn--primary:active {
  background: var(--color-primary-active);
}

.btn--secondary {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid oklch(from var(--color-primary) l c h / 0.3);
}

.btn--secondary:hover {
  background: var(--color-primary-highlight);
  border-color: var(--color-primary);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
}

.btn--ghost:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: oklch(from var(--color-text) l c h / 0.12);
}

/* Form elements */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.form-label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.form-input,
.form-textarea {
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  color: var(--color-text);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
  min-height: 44px;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-faint);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.12);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}

/* Divider */
.divider {
  height: 1px;
  background: var(--color-divider);
  border: none;
}

/* Page hero */
.page-hero {
  padding-block: clamp(var(--space-12), 8vw, var(--space-20));
  text-align: center;
}

.page-hero__overline {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-primary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.page-hero__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.page-hero__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 55ch;
  margin-inline: auto;
  line-height: 1.7;
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal--visible {
  opacity: 1;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  top: var(--space-2);
}