/*
 * Trials.ai Website Style Guide
 * Derived from trialsai-frontend platform app for brand consistency
 * Framework: Ant Design (ng-zorro) + Open Sans typography
 *
 * This file defines CSS custom properties (variables) for the
 * static website redesign, matching the platform's design system.
 */

/* ============================================================
   COLOR SYSTEM
   ============================================================ */

:root {

  /* --- Primary: Trials.ai Orange --- */
  --color-primary:          #ec7200;
  --color-primary-hover:    #d46600;  /* orange-80 */
  --color-primary-active:   #b35500;  /* orange-90 */
  --color-primary-light:    #ffaa5b;  /* orange-30 */
  --color-primary-lighter:  #ffbb7d;  /* orange-40 */
  --color-primary-bg:       #fff3e7;  /* orange-05 */
  --color-primary-bg-light: #fffaf5;  /* orange-00 */
  --color-primary-10:       rgba(236, 114, 0, 0.1);
  --color-primary-20:       rgba(236, 114, 0, 0.2);

  /* --- Secondary: ZS Teal --- */
  --color-secondary:          #27a6a4;
  --color-secondary-hover:    #2f6f7b;  /* teal-80 */
  --color-secondary-active:   #2d535f;  /* teal-90 */
  --color-secondary-light:    #82dfe2;  /* teal-30 */
  --color-secondary-bg:       #e0eceb;  /* teal-10 */
  --color-secondary-bg-light: #f3fcfe;  /* teal-00 */
  --color-secondary-10:       rgba(39, 166, 164, 0.1);
  --color-secondary-20:       rgba(39, 166, 164, 0.2);

  /* --- Neutrals / Gray Scale --- */
  --color-black:            #131118;
  --color-headline:         #1a1628;  /* gray-100 */
  --color-body:             #2f2c3c;  /* gray-90 - default body text */
  --color-component:        #454250;  /* gray-80 */
  --color-text-secondary:   #575662;  /* gray-70 */
  --color-text-medium:      #716e79;  /* gray-60 */
  --color-text-muted:       #87848d;  /* gray-50 */
  --color-disabled:         #858585;  /* gray-30 */
  --color-icon-light:       #9c9aa1;  /* gray-40 */
  --color-border-light:     #b2b0b6;  /* gray-25 */
  --color-border:           #dedcde;  /* gray-20 */
  --color-bg-hover:         #f4f3f3;  /* gray-10 */
  --color-bg-subtle:        #f0f0f0;  /* gray-05 */
  --color-bg-light:         #fafafa;  /* gray-00 */
  --color-white:            #fff;

  /* --- Semantic: Error / Negative --- */
  --color-error:            #b21111;
  --color-error-text:       #b92208;
  --color-error-accent:     #cd2b3f;
  --color-error-light:      #ffb6a5;
  --color-error-bg:         #ffede9;

  /* --- Semantic: Warning --- */
  --color-warning:          #e3a900;
  --color-warning-text:     #ba8805;
  --color-warning-accent:   #f3ba2f;
  --color-warning-bg:       #fff9f1;

  /* --- Semantic: Success / Positive --- */
  --color-success:          #00aa67;
  --color-success-text:     #058f69;
  --color-success-bg:       #f1feff;

  /* --- Semantic: Info / Blue --- */
  --color-info:             #3287c4;
  --color-info-accent:      #0952ca;
  --color-info-light:       #7cc0ff;
  --color-info-bg:          #e6f7ff;
  --color-info-border:      #99d3fd;

  /* --- Accent Colors --- */
  --color-brand-yellow:     #fecb2f;
  --color-navy:             #343963;
  --color-purple:           #a6b2f3;

  /* --- Hyperlinks (teal for better readability) --- */
  --color-link:             #2d8b92;  /* teal-70 */
  --color-link-hover:       #27a6a4;  /* secondary */
  --color-link-active:      #2d535f;  /* teal-90 */

  /* --- Focus Ring --- */
  --color-focus-inner:      #fff;
  --color-focus-outer:      #0952ca;


  /* ============================================================
     TYPOGRAPHY
     ============================================================ */

  /* --- Font Families --- */
  --font-body:    'Open Sans', 'Inter', 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
  --font-code:    'Courier New', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Monaco', monospace;

  /* --- Font Sizes --- */
  --text-xs:      12px;
  --text-sm:      14px;
  --text-base:    16px;
  --text-lg:      20px;
  --text-xl:      24px;
  --text-2xl:     30px;
  --text-3xl:     38px;

  /* --- Font Weights --- */
  --weight-regular:   400;
  --weight-medium:    500;
  --weight-semibold:  600;
  --weight-bold:      700;

  /* --- Line Heights --- */
  --leading-tight:    1.25;
  --leading-normal:   1.5;
  --leading-relaxed:  1.5715;
  --leading-fixed:    24px;

  /* --- Letter Spacing --- */
  --tracking-tight:   -0.176px;
  --tracking-normal:  0;


  /* ============================================================
     SPACING (8px base grid)
     ============================================================ */

  --space-1:    1px;
  --space-2:    2px;
  --space-4:    4px;
  --space-6:    6px;
  --space-8:    8px;
  --space-10:   10px;
  --space-12:   12px;
  --space-16:   16px;
  --space-20:   20px;
  --space-24:   24px;
  --space-32:   32px;
  --space-36:   36px;
  --space-40:   40px;
  --space-48:   48px;
  --space-64:   64px;


  /* ============================================================
     BORDERS & RADIUS
     ============================================================ */

  --radius-sm:    2px;
  --radius-base:  4px;
  --radius-lg:    16px;
  --radius-full:  100px;  /* pills, progress bars */

  --border-width: 1px;
  --border-color: var(--color-border);


  /* ============================================================
     SHADOWS
     ============================================================ */

  --shadow-sm:
    0px 2px 4px 0px rgba(26, 22, 40, 0.12),
    0px 0px 2px 0px rgba(26, 22, 40, 0.12),
    0px 0px 1px 0px rgba(0, 0, 0, 0.04);

  --shadow-base:
    0 3px 6px -4px rgba(0, 0, 0, 0.12),
    0 6px 16px 0 rgba(0, 0, 0, 0.08),
    0 9px 28px 8px rgba(0, 0, 0, 0.05);

  --shadow-card:
    0 1px 2px -2px rgba(0, 0, 0, 0.16),
    0 3px 6px 0 rgba(0, 0, 0, 0.12),
    0 5px 12px 4px rgba(0, 0, 0, 0.09);

  --shadow-btn:         0 2px 0 rgba(0, 0, 0, 0.015);
  --shadow-btn-primary: 0 2px 0 rgba(0, 0, 0, 0.045);

  --shadow-focus:       0 0 0 2px var(--color-focus-inner), 0 0 0 4px var(--color-focus-outer);


  /* ============================================================
     COMPONENT SIZES
     ============================================================ */

  /* --- Heights --- */
  --height-sm:    24px;
  --height-base:  36px;
  --height-md:    40px;
  --height-lg:    44px;

  /* --- Layout --- */
  --header-height:    52px;
  --sidebar-width:    20%;
  --sidebar-collapsed: 52px;
  --content-padding:  24px;

  /* --- Z-Index --- */
  --z-header:       10;
  --z-modal:        1000;
  --z-message:      1010;
  --z-popover:      1030;
  --z-dropdown:     1050;
  --z-tooltip:      1070;


  /* ============================================================
     BREAKPOINTS (use in @media queries)
     ============================================================

     --bp-xs:   480px    (phone)
     --bp-sm:   576px    (tablet)
     --bp-md:   768px    (desktop)
     --bp-lg:   992px    (wide)
     --bp-xl:   1200px   (wider)
     --bp-xxl:  1600px   (ultrawide)

     Note: CSS custom properties can't be used in @media queries.
     These values are documented here for reference.
     ============================================================ */


  /* ============================================================
     TRANSITIONS
     ============================================================ */

  --duration-fast:  0.1s;
  --duration-base:  0.2s;
  --duration-slow:  0.3s;

  --ease-out:       cubic-bezier(0.215, 0.61, 0.355, 1);
  --ease-in:        cubic-bezier(0.55, 0.055, 0.675, 0.19);
  --ease-in-out:    cubic-bezier(0.645, 0.045, 0.355, 1);
}


/* ============================================================
   BASE TYPOGRAPHY
   ============================================================ */

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-relaxed);
  color: var(--color-body);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-headline);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  margin: 0 0 var(--space-16);
}

h1 { font-size: var(--text-3xl); }  /* 38px */
h2 { font-size: var(--text-2xl); }  /* 30px */
h3 { font-size: var(--text-xl);  }  /* 24px */
h4 { font-size: var(--text-lg);  }  /* 20px */
h5 { font-size: var(--text-base); } /* 16px */
h6 { font-size: var(--text-sm);  }  /* 14px */

p {
  margin: 0 0 var(--space-16);
  line-height: var(--leading-normal);
}

small, .text-sm { font-size: var(--text-sm); }
.text-xs { font-size: var(--text-xs); }
.text-muted { color: var(--color-text-medium); }

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--duration-base) var(--ease-out);
}
a:hover  { color: var(--color-link-hover); }
a:active { color: var(--color-link-active); }
a:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
  border-radius: var(--radius-sm);
}


/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  height: var(--height-md);
  padding: 0 var(--space-24);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-regular);
  line-height: 1;
  border: var(--border-width) solid transparent;
  border-radius: var(--radius-base);
  cursor: pointer;
  transition:
    background-color var(--duration-base) var(--ease-out),
    border-color var(--duration-base) var(--ease-out),
    color var(--duration-base) var(--ease-out);
  white-space: nowrap;
  user-select: none;
}
.btn:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

/* Primary */
.btn-primary {
  color: var(--color-white);
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-btn-primary);
}
.btn-primary:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}
.btn-primary:active {
  background-color: var(--color-primary-active);
  border-color: var(--color-primary-active);
}

/* Default / Secondary */
.btn-default {
  color: var(--color-component);
  background-color: var(--color-white);
  border-color: var(--color-border);
  box-shadow: var(--shadow-btn);
}
.btn-default:hover {
  color: var(--color-primary);
  border-color: var(--color-primary-hover);
}
.btn-default:active {
  background-color: var(--color-primary-10);
}

/* Dark */
.btn-dark {
  color: var(--color-white);
  background-color: var(--color-component);
  border-color: transparent;
}
.btn-dark:hover {
  border-color: var(--color-icon-light);
}

/* Link / Ghost */
.btn-link {
  color: var(--color-primary);
  background: transparent;
  border: none;
  padding: 0;
  height: auto;
  box-shadow: none;
}
.btn-link:hover { color: var(--color-primary-light); }
.btn-link:active { color: var(--color-primary-active); }

/* Disabled (applies to all variants) */
.btn:disabled,
.btn[disabled] {
  background-color: var(--color-bg-hover);
  color: var(--color-text-medium);
  border-color: var(--color-border);
  cursor: not-allowed;
  box-shadow: none;
}

/* Sizes */
.btn-sm {
  height: var(--height-sm);
  padding: 0 var(--space-8);
  font-size: var(--text-sm);
}
.btn-lg {
  height: var(--height-lg);
  padding: 0 var(--space-24);
  font-size: var(--text-base);
}


/* ============================================================
   FORM INPUTS
   ============================================================ */

.input,
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="url"],
input[type="tel"],
input[type="number"],
select,
textarea {
  height: var(--height-base);
  padding: var(--space-4) var(--space-12);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-component);
  background-color: var(--color-white);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-base);
  transition:
    border-color var(--duration-base) var(--ease-out),
    box-shadow var(--duration-base) var(--ease-out);
}

.input:hover,
input:hover,
select:hover,
textarea:hover {
  border-color: var(--color-primary);
}

.input:focus,
input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.input::placeholder,
input::placeholder,
textarea::placeholder {
  color: var(--color-disabled);
}

.input:disabled,
input:disabled,
select:disabled,
textarea:disabled {
  background-color: var(--color-bg-hover);
  color: var(--color-disabled);
  cursor: not-allowed;
}

textarea {
  height: auto;
  min-height: var(--height-md);
  resize: vertical;
}

label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  color: var(--color-headline);
  margin-bottom: var(--space-8);
}


/* ============================================================
   CARDS
   ============================================================ */

.card {
  background: var(--color-white);
  border-radius: var(--radius-base);
  box-shadow: var(--shadow-card);
  padding: var(--space-24);
}

.card-header {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: var(--color-headline);
  padding-bottom: var(--space-16);
  margin-bottom: var(--space-16);
  border-bottom: var(--border-width) solid var(--color-border);
}


/* ============================================================
   ALERTS / BANNERS
   ============================================================ */

.alert {
  padding: var(--space-16);
  border-radius: var(--radius-base);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

.alert-error {
  background-color: var(--color-error-bg);
  color: var(--color-error-text);
  border: var(--border-width) solid var(--color-error-light);
}

.alert-warning {
  background-color: var(--color-warning-bg);
  color: var(--color-warning-text);
  border: var(--border-width) solid var(--color-warning-accent);
}

.alert-success {
  background-color: var(--color-success-bg);
  color: var(--color-success-text);
  border: var(--border-width) solid var(--color-success);
}

.alert-info {
  background-color: var(--color-info-bg);
  color: var(--color-info);
  border: var(--border-width) solid var(--color-info-border);
}


/* ============================================================
   BADGES
   ============================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  height: 20px;
  padding: 0 var(--space-8);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  border-radius: var(--radius-base);
  white-space: nowrap;
}

.badge-primary {
  background-color: var(--color-primary-10);
  color: var(--color-primary-hover);
}

.badge-success {
  background-color: var(--color-success-bg);
  color: var(--color-success-text);
}

.badge-warning {
  background-color: var(--color-warning-bg);
  color: var(--color-warning-text);
}

.badge-error {
  background-color: var(--color-error-bg);
  color: var(--color-error-text);
}


/* ============================================================
   UTILITY CLASSES
   ============================================================ */

/* Text colors */
.text-primary   { color: var(--color-primary); }
.text-success   { color: var(--color-success); }
.text-warning   { color: var(--color-warning); }
.text-error     { color: var(--color-error); }
.text-headline  { color: var(--color-headline); }
.text-body      { color: var(--color-body); }
.text-secondary { color: var(--color-text-secondary); }
.text-disabled  { color: var(--color-disabled); }

/* Background colors */
.bg-primary     { background-color: var(--color-primary); }
.bg-primary-bg  { background-color: var(--color-primary-bg); }
.bg-light       { background-color: var(--color-bg-light); }
.bg-hover       { background-color: var(--color-bg-hover); }
.bg-white       { background-color: var(--color-white); }

/* Font weights */
.font-regular   { font-weight: var(--weight-regular); }
.font-medium    { font-weight: var(--weight-medium); }
.font-semibold  { font-weight: var(--weight-semibold); }
.font-bold      { font-weight: var(--weight-bold); }